Merge branch 'linus' into stackprotector

Conflicts:
	arch/x86/include/asm/pda.h
	kernel/fork.c

134 files changed, 17467 insertions, 6099 deletions

diff --git a/kernel/Kconfig.freezer b/kernel/Kconfig.freezer
new file mode 100644
index 000000000000..a3bb4cb52539
--- /dev/null
+++ b/kernel/Kconfig.freezer
@@ -0,0 +1,2 @@
+config FREEZER
+	def_bool PM_SLEEP || CGROUP_FREEZER
diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index 9fdba03dc1fc..bf987b95b356 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -52,28 +52,3 @@ config PREEMPT
 
 endchoice
 
-config PREEMPT_RCU
-	bool "Preemptible RCU"
-	depends on PREEMPT
-	default n
-	help
-	  This option reduces the latency of the kernel by making certain
-	  RCU sections preemptible. Normally RCU code is non-preemptible, if
-	  this option is selected then read-only RCU sections become
-	  preemptible. This helps latency, but may expose bugs due to
-	  now-naive assumptions about each RCU read-side critical section
-	  remaining on a given CPU through its execution.
-
-	  Say N if you are unsure.
-
-config RCU_TRACE
-	bool "Enable tracing for RCU - currently stats in debugfs"
-	depends on PREEMPT_RCU
-	select DEBUG_FS
-	default y
-	help
-	  This option provides tracing in RCU which presents stats
-	  in debugfs for debugging RCU implementation.
-
-	  Say Y here if you want to enable RCU tracing
-	  Say N if you are unsure.
diff --git a/kernel/Makefile b/kernel/Makefile
index 4e1d7df7c3e2..e1c5bf3365c0 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -9,11 +9,9 @@ obj-y     = sched.o fork.o exec_domain.o panic.o printk.o \
 	    rcupdate.o extable.o params.o posix-timers.o \
 	    kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
 	    hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
-	    notifier.o ksysfs.o pm_qos_params.o sched_clock.o
+	    notifier.o ksysfs.o pm_qos_params.o sched_clock.o cred.o
 
-CFLAGS_REMOVE_sched.o = -mno-spe
-
-ifdef CONFIG_FTRACE
+ifdef CONFIG_FUNCTION_TRACER
 # Do not trace debug files and internal ftrace files
 CFLAGS_REMOVE_lockdep.o = -pg
 CFLAGS_REMOVE_lockdep_proc.o = -pg
@@ -21,9 +19,9 @@ CFLAGS_REMOVE_mutex-debug.o = -pg
 CFLAGS_REMOVE_rtmutex-debug.o = -pg
 CFLAGS_REMOVE_cgroup-debug.o = -pg
 CFLAGS_REMOVE_sched_clock.o = -pg
-CFLAGS_REMOVE_sched.o = -mno-spe -pg
 endif
 
+obj-$(CONFIG_FREEZER) += freezer.o
 obj-$(CONFIG_PROFILING) += profile.o
 obj-$(CONFIG_SYSCTL_SYSCALL_CHECK) += sysctl_check.o
 obj-$(CONFIG_STACKTRACE) += stacktrace.o
@@ -55,6 +53,7 @@ obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
 obj-$(CONFIG_COMPAT) += compat.o
 obj-$(CONFIG_CGROUPS) += cgroup.o
 obj-$(CONFIG_CGROUP_DEBUG) += cgroup_debug.o
+obj-$(CONFIG_CGROUP_FREEZER) += cgroup_freezer.o
 obj-$(CONFIG_CPUSETS) += cpuset.o
 obj-$(CONFIG_CGROUP_NS) += ns_cgroup.o
 obj-$(CONFIG_UTS_NS) += utsname.o
@@ -74,22 +73,23 @@ obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
 obj-$(CONFIG_SECCOMP) += seccomp.o
 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
 obj-$(CONFIG_CLASSIC_RCU) += rcuclassic.o
+obj-$(CONFIG_TREE_RCU) += rcutree.o
 obj-$(CONFIG_PREEMPT_RCU) += rcupreempt.o
-ifeq ($(CONFIG_PREEMPT_RCU),y)
-obj-$(CONFIG_RCU_TRACE) += rcupreempt_trace.o
-endif
+obj-$(CONFIG_TREE_RCU_TRACE) += rcutree_trace.o
+obj-$(CONFIG_PREEMPT_RCU_TRACE) += rcupreempt_trace.o
 obj-$(CONFIG_RELAY) += relay.o
 obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
 obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
 obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
 obj-$(CONFIG_MARKERS) += marker.o
+obj-$(CONFIG_TRACEPOINTS) += tracepoint.o
 obj-$(CONFIG_LATENCYTOP) += latencytop.o
 obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
-obj-$(CONFIG_FTRACE) += trace/
+obj-$(CONFIG_FUNCTION_TRACER) += trace/
 obj-$(CONFIG_TRACING) += trace/
 obj-$(CONFIG_SMP) += sched_cpupri.o
 
-ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y)
+ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
 # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
 # needed for x86 only.  Why this used to be enabled for all architectures is beyond
 # me.  I suspect most platforms don't need this, but until we know that for sure
diff --git a/kernel/acct.c b/kernel/acct.c
index f6006a60df5d..d57b7cbb98b6 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -530,15 +530,14 @@ static void do_acct_process(struct bsd_acct_struct *acct,
 	do_div(elapsed, AHZ);
 	ac.ac_btime = get_seconds() - elapsed;
 	/* we really need to bite the bullet and change layout */
-	ac.ac_uid = current->uid;
-	ac.ac_gid = current->gid;
+	current_uid_gid(&ac.ac_uid, &ac.ac_gid);
 #if ACCT_VERSION==2
 	ac.ac_ahz = AHZ;
 #endif
 #if ACCT_VERSION==1 || ACCT_VERSION==2
 	/* backward-compatible 16 bit fields */
-	ac.ac_uid16 = current->uid;
-	ac.ac_gid16 = current->gid;
+	ac.ac_uid16 = ac.ac_uid;
+	ac.ac_gid16 = ac.ac_gid;
 #endif
 #if ACCT_VERSION==3
 	ac.ac_pid = task_tgid_nr_ns(current, ns);
diff --git a/kernel/audit.c b/kernel/audit.c
index 4414e93d8750..ce6d8ea3131e 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -61,8 +61,11 @@
 
 #include "audit.h"
 
-/* No auditing will take place until audit_initialized != 0.
+/* No auditing will take place until audit_initialized == AUDIT_INITIALIZED.
  * (Initialization happens after skb_init is called.) */
+#define AUDIT_DISABLED		-1
+#define AUDIT_UNINITIALIZED	0
+#define AUDIT_INITIALIZED	1
 static int	audit_initialized;
 
 #define AUDIT_OFF	0
@@ -965,6 +968,9 @@ static int __init audit_init(void)
 {
 	int i;
 
+	if (audit_initialized == AUDIT_DISABLED)
+		return 0;
+
 	printk(KERN_INFO "audit: initializing netlink socket (%s)\n",
 	       audit_default ? "enabled" : "disabled");
 	audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, 0,
@@ -976,7 +982,7 @@ static int __init audit_init(void)
 
 	skb_queue_head_init(&audit_skb_queue);
 	skb_queue_head_init(&audit_skb_hold_queue);
-	audit_initialized = 1;
+	audit_initialized = AUDIT_INITIALIZED;
 	audit_enabled = audit_default;
 	audit_ever_enabled |= !!audit_default;
 
@@ -999,13 +1005,21 @@ __initcall(audit_init);
 static int __init audit_enable(char *str)
 {
 	audit_default = !!simple_strtol(str, NULL, 0);
-	printk(KERN_INFO "audit: %s%s\n",
-	       audit_default ? "enabled" : "disabled",
-	       audit_initialized ? "" : " (after initialization)");
-	if (audit_initialized) {
+	if (!audit_default)
+		audit_initialized = AUDIT_DISABLED;
+
+	printk(KERN_INFO "audit: %s", audit_default ? "enabled" : "disabled");
+
+	if (audit_initialized == AUDIT_INITIALIZED) {
 		audit_enabled = audit_default;
 		audit_ever_enabled |= !!audit_default;
+	} else if (audit_initialized == AUDIT_UNINITIALIZED) {
+		printk(" (after initialization)");
+	} else {
+		printk(" (until reboot)");
 	}
+	printk("\n");
+
 	return 1;
 }
 
@@ -1107,9 +1121,7 @@ unsigned int audit_serial(void)
 static inline void audit_get_stamp(struct audit_context *ctx,
 				   struct timespec *t, unsigned int *serial)
 {
-	if (ctx)
-		auditsc_get_stamp(ctx, t, serial);
-	else {
+	if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
 		*t = CURRENT_TIME;
 		*serial = audit_serial();
 	}
@@ -1146,7 +1158,7 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
 	int reserve;
 	unsigned long timeout_start = jiffies;
 
-	if (!audit_initialized)
+	if (audit_initialized != AUDIT_INITIALIZED)
 		return NULL;
 
 	if (unlikely(audit_filter_type(type)))
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index f7921a2ecf16..8b509441f49a 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -24,6 +24,7 @@ struct audit_chunk {
 	struct list_head trees;		/* with root here */
 	int dead;
 	int count;
+	atomic_long_t refs;
 	struct rcu_head head;
 	struct node {
 		struct list_head list;
@@ -56,7 +57,8 @@ static LIST_HEAD(prune_list);
  * tree is refcounted; one reference for "some rules on rules_list refer to
  * it", one for each chunk with pointer to it.
  *
- * chunk is refcounted by embedded inotify_watch.
+ * chunk is refcounted by embedded inotify_watch + .refs (non-zero refcount
+ * of watch contributes 1 to .refs).
  *
  * node.index allows to get from node.list to containing chunk.
  * MSB of that sucker is stolen to mark taggings that we might have to
@@ -121,6 +123,7 @@ static struct audit_chunk *alloc_chunk(int count)
 	INIT_LIST_HEAD(&chunk->hash);
 	INIT_LIST_HEAD(&chunk->trees);
 	chunk->count = count;
+	atomic_long_set(&chunk->refs, 1);
 	for (i = 0; i < count; i++) {
 		INIT_LIST_HEAD(&chunk->owners[i].list);
 		chunk->owners[i].index = i;
@@ -129,9 +132,8 @@ static struct audit_chunk *alloc_chunk(int count)
 	return chunk;
 }
 
-static void __free_chunk(struct rcu_head *rcu)
+static void free_chunk(struct audit_chunk *chunk)
 {
-	struct audit_chunk *chunk = container_of(rcu, struct audit_chunk, head);
 	int i;
 
 	for (i = 0; i < chunk->count; i++) {
@@ -141,14 +143,16 @@ static void __free_chunk(struct rcu_head *rcu)
 	kfree(chunk);
 }
 
-static inline void free_chunk(struct audit_chunk *chunk)
+void audit_put_chunk(struct audit_chunk *chunk)
 {
-	call_rcu(&chunk->head, __free_chunk);
+	if (atomic_long_dec_and_test(&chunk->refs))
+		free_chunk(chunk);
 }
 
-void audit_put_chunk(struct audit_chunk *chunk)
+static void __put_chunk(struct rcu_head *rcu)
 {
-	put_inotify_watch(&chunk->watch);
+	struct audit_chunk *chunk = container_of(rcu, struct audit_chunk, head);
+	audit_put_chunk(chunk);
 }
 
 enum {HASH_SIZE = 128};
@@ -176,7 +180,7 @@ struct audit_chunk *audit_tree_lookup(const struct inode *inode)
 
 	list_for_each_entry_rcu(p, list, hash) {
 		if (p->watch.inode == inode) {
-			get_inotify_watch(&p->watch);
+			atomic_long_inc(&p->refs);
 			return p;
 		}
 	}
@@ -194,17 +198,49 @@ int audit_tree_match(struct audit_chunk *chunk, struct audit_tree *tree)
 
 /* tagging and untagging inodes with trees */
 
-static void untag_chunk(struct audit_chunk *chunk, struct node *p)
+static struct audit_chunk *find_chunk(struct node *p)
+{
+	int index = p->index & ~(1U<<31);
+	p -= index;
+	return container_of(p, struct audit_chunk, owners[0]);
+}
+
+static void untag_chunk(struct node *p)
 {
+	struct audit_chunk *chunk = find_chunk(p);
 	struct audit_chunk *new;
 	struct audit_tree *owner;
 	int size = chunk->count - 1;
 	int i, j;
 
+	if (!pin_inotify_watch(&chunk->watch)) {
+		/*
+		 * Filesystem is shutting down; all watches are getting
+		 * evicted, just take it off the node list for this
+		 * tree and let the eviction logics take care of the
+		 * rest.
+		 */
+		owner = p->owner;
+		if (owner->root == chunk) {
+			list_del_init(&owner->same_root);
+			owner->root = NULL;
+		}
+		list_del_init(&p->list);
+		p->owner = NULL;
+		put_tree(owner);
+		return;
+	}
+
+	spin_unlock(&hash_lock);
+
+	/*
+	 * pin_inotify_watch() succeeded, so the watch won't go away
+	 * from under us.
+	 */
 	mutex_lock(&chunk->watch.inode->inotify_mutex);
 	if (chunk->dead) {
 		mutex_unlock(&chunk->watch.inode->inotify_mutex);
-		return;
+		goto out;
 	}
 
 	owner = p->owner;
@@ -221,7 +257,7 @@ static void untag_chunk(struct audit_chunk *chunk, struct node *p)
 		inotify_evict_watch(&chunk->watch);
 		mutex_unlock(&chunk->watch.inode->inotify_mutex);
 		put_inotify_watch(&chunk->watch);
-		return;
+		goto out;
 	}
 
 	new = alloc_chunk(size);
@@ -263,7 +299,7 @@ static void untag_chunk(struct audit_chunk *chunk, struct node *p)
 	inotify_evict_watch(&chunk->watch);
 	mutex_unlock(&chunk->watch.inode->inotify_mutex);
 	put_inotify_watch(&chunk->watch);
-	return;
+	goto out;
 
 Fallback:
 	// do the best we can
@@ -277,6 +313,9 @@ Fallback:
 	put_tree(owner);
 	spin_unlock(&hash_lock);
 	mutex_unlock(&chunk->watch.inode->inotify_mutex);
+out:
+	unpin_inotify_watch(&chunk->watch);
+	spin_lock(&hash_lock);
 }
 
 static int create_chunk(struct inode *inode, struct audit_tree *tree)
@@ -387,13 +426,6 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
 	return 0;
 }
 
-static struct audit_chunk *find_chunk(struct node *p)
-{
-	int index = p->index & ~(1U<<31);
-	p -= index;
-	return container_of(p, struct audit_chunk, owners[0]);
-}
-
 static void kill_rules(struct audit_tree *tree)
 {
 	struct audit_krule *rule, *next;
@@ -431,17 +463,10 @@ static void prune_one(struct audit_tree *victim)
 	spin_lock(&hash_lock);
 	while (!list_empty(&victim->chunks)) {
 		struct node *p;
-		struct audit_chunk *chunk;
 
 		p = list_entry(victim->chunks.next, struct node, list);
-		chunk = find_chunk(p);
-		get_inotify_watch(&chunk->watch);
-		spin_unlock(&hash_lock);
-
-		untag_chunk(chunk, p);
 
-		put_inotify_watch(&chunk->watch);
-		spin_lock(&hash_lock);
+		untag_chunk(p);
 	}
 	spin_unlock(&hash_lock);
 	put_tree(victim);
@@ -469,7 +494,6 @@ static void trim_marked(struct audit_tree *tree)
 
 	while (!list_empty(&tree->chunks)) {
 		struct node *node;
-		struct audit_chunk *chunk;
 
 		node = list_entry(tree->chunks.next, struct node, list);
 
@@ -477,14 +501,7 @@ static void trim_marked(struct audit_tree *tree)
 		if (!(node->index & (1U<<31)))
 			break;
 
-		chunk = find_chunk(node);
-		get_inotify_watch(&chunk->watch);
-		spin_unlock(&hash_lock);
-
-		untag_chunk(chunk, node);
-
-		put_inotify_watch(&chunk->watch);
-		spin_lock(&hash_lock);
+		untag_chunk(node);
 	}
 	if (!tree->root && !tree->goner) {
 		tree->goner = 1;
@@ -532,7 +549,7 @@ void audit_trim_trees(void)
 	list_add(&cursor, &tree_list);
 	while (cursor.next != &tree_list) {
 		struct audit_tree *tree;
-		struct nameidata nd;
+		struct path path;
 		struct vfsmount *root_mnt;
 		struct node *node;
 		struct list_head list;
@@ -544,12 +561,12 @@ void audit_trim_trees(void)
 		list_add(&cursor, &tree->list);
 		mutex_unlock(&audit_filter_mutex);
 
-		err = path_lookup(tree->pathname, 0, &nd);
+		err = kern_path(tree->pathname, 0, &path);
 		if (err)
 			goto skip_it;
 
-		root_mnt = collect_mounts(nd.path.mnt, nd.path.dentry);
-		path_put(&nd.path);
+		root_mnt = collect_mounts(path.mnt, path.dentry);
+		path_put(&path);
 		if (!root_mnt)
 			goto skip_it;
 
@@ -580,19 +597,19 @@ skip_it:
 }
 
 static int is_under(struct vfsmount *mnt, struct dentry *dentry,
-		    struct nameidata *nd)
+		    struct path *path)
 {
-	if (mnt != nd->path.mnt) {
+	if (mnt != path->mnt) {
 		for (;;) {
 			if (mnt->mnt_parent == mnt)
 				return 0;
-			if (mnt->mnt_parent == nd->path.mnt)
+			if (mnt->mnt_parent == path->mnt)
 					break;
 			mnt = mnt->mnt_parent;
 		}
 		dentry = mnt->mnt_mountpoint;
 	}
-	return is_subdir(dentry, nd->path.dentry);
+	return is_subdir(dentry, path->dentry);
 }
 
 int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op)
@@ -618,7 +635,7 @@ void audit_put_tree(struct audit_tree *tree)
 int audit_add_tree_rule(struct audit_krule *rule)
 {
 	struct audit_tree *seed = rule->tree, *tree;
-	struct nameidata nd;
+	struct path path;
 	struct vfsmount *mnt, *p;
 	struct list_head list;
 	int err;
@@ -637,11 +654,11 @@ int audit_add_tree_rule(struct audit_krule *rule)
 	/* do not set rule->tree yet */
 	mutex_unlock(&audit_filter_mutex);
 
-	err = path_lookup(tree->pathname, 0, &nd);
+	err = kern_path(tree->pathname, 0, &path);
 	if (err)
 		goto Err;
-	mnt = collect_mounts(nd.path.mnt, nd.path.dentry);
-	path_put(&nd.path);
+	mnt = collect_mounts(path.mnt, path.dentry);
+	path_put(&path);
 	if (!mnt) {
 		err = -ENOMEM;
 		goto Err;
@@ -690,29 +707,29 @@ int audit_tag_tree(char *old, char *new)
 {
 	struct list_head cursor, barrier;
 	int failed = 0;
-	struct nameidata nd;
+	struct path path;
 	struct vfsmount *tagged;
 	struct list_head list;
 	struct vfsmount *mnt;
 	struct dentry *dentry;
 	int err;
 
-	err = path_lookup(new, 0, &nd);
+	err = kern_path(new, 0, &path);
 	if (err)
 		return err;
-	tagged = collect_mounts(nd.path.mnt, nd.path.dentry);
-	path_put(&nd.path);
+	tagged = collect_mounts(path.mnt, path.dentry);
+	path_put(&path);
 	if (!tagged)
 		return -ENOMEM;
 
-	err = path_lookup(old, 0, &nd);
+	err = kern_path(old, 0, &path);
 	if (err) {
 		drop_collected_mounts(tagged);
 		return err;
 	}
-	mnt = mntget(nd.path.mnt);
-	dentry = dget(nd.path.dentry);
-	path_put(&nd.path);
+	mnt = mntget(path.mnt);
+	dentry = dget(path.dentry);
+	path_put(&path);
 
 	if (dentry == tagged->mnt_root && dentry == mnt->mnt_root)
 		follow_up(&mnt, &dentry);
@@ -733,7 +750,7 @@ int audit_tag_tree(char *old, char *new)
 		list_add(&cursor, &tree->list);
 		mutex_unlock(&audit_filter_mutex);
 
-		err = path_lookup(tree->pathname, 0, &nd);
+		err = kern_path(tree->pathname, 0, &path);
 		if (err) {
 			put_tree(tree);
 			mutex_lock(&audit_filter_mutex);
@@ -741,15 +758,15 @@ int audit_tag_tree(char *old, char *new)
 		}
 
 		spin_lock(&vfsmount_lock);
-		if (!is_under(mnt, dentry, &nd)) {
+		if (!is_under(mnt, dentry, &path)) {
 			spin_unlock(&vfsmount_lock);
-			path_put(&nd.path);
+			path_put(&path);
 			put_tree(tree);
 			mutex_lock(&audit_filter_mutex);
 			continue;
 		}
 		spin_unlock(&vfsmount_lock);
-		path_put(&nd.path);
+		path_put(&path);
 
 		list_for_each_entry(p, &list, mnt_list) {
 			failed = tag_chunk(p->mnt_root->d_inode, tree);
@@ -878,7 +895,7 @@ static void handle_event(struct inotify_watch *watch, u32 wd, u32 mask,
 static void destroy_watch(struct inotify_watch *watch)
 {
 	struct audit_chunk *chunk = container_of(watch, struct audit_chunk, watch);
-	free_chunk(chunk);
+	call_rcu(&chunk->head, __put_chunk);
 }
 
 static const struct inotify_operations rtree_inotify_ops = {
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index b7d354e2b0ef..9fd85a4640a0 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1094,8 +1094,8 @@ static void audit_inotify_unregister(struct list_head *in_list)
 	list_for_each_entry_safe(p, n, in_list, ilist) {
 		list_del(&p->ilist);
 		inotify_rm_watch(audit_ih, &p->wdata);
-		/* the put matching the get in audit_do_del_rule() */
-		put_inotify_watch(&p->wdata);
+		/* the unpin matching the pin in audit_do_del_rule() */
+		unpin_inotify_watch(&p->wdata);
 	}
 }
 
@@ -1389,9 +1389,13 @@ static inline int audit_del_rule(struct audit_entry *entry,
 				/* Put parent on the inotify un-registration
 				 * list.  Grab a reference before releasing
 				 * audit_filter_mutex, to be released in
-				 * audit_inotify_unregister(). */
-				list_add(&parent->ilist, &inotify_list);
-				get_inotify_watch(&parent->wdata);
+				 * audit_inotify_unregister().
+				 * If filesystem is going away, just leave
+				 * the sucker alone, eviction will take
+				 * care of it.
+				 */
+				if (pin_inotify_watch(&parent->wdata))
+					list_add(&parent->ilist, &inotify_list);
 			}
 		}
 	}
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index cf5bc2f5f9c3..4819f3711973 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -65,6 +65,7 @@
 #include <linux/highmem.h>
 #include <linux/syscalls.h>
 #include <linux/inotify.h>
+#include <linux/capability.h>
 
 #include "audit.h"
 
@@ -84,6 +85,15 @@ int audit_n_rules;
 /* determines whether we collect data for signals sent */
 int audit_signals;
 
+struct audit_cap_data {
+	kernel_cap_t		permitted;
+	kernel_cap_t		inheritable;
+	union {
+		unsigned int	fE;		/* effective bit of a file capability */
+		kernel_cap_t	effective;	/* effective set of a process */
+	};
+};
+
 /* When fs/namei.c:getname() is called, we store the pointer in name and
  * we don't let putname() free it (instead we free all of the saved
  * pointers at syscall exit time).
@@ -100,6 +110,8 @@ struct audit_names {
 	gid_t		gid;
 	dev_t		rdev;
 	u32		osid;
+	struct audit_cap_data fcap;
+	unsigned int	fcap_ver;
 };
 
 struct audit_aux_data {
@@ -184,6 +196,20 @@ struct audit_aux_data_pids {
 	int			pid_count;
 };
 
+struct audit_aux_data_bprm_fcaps {
+	struct audit_aux_data	d;
+	struct audit_cap_data	fcap;
+	unsigned int		fcap_ver;
+	struct audit_cap_data	old_pcap;
+	struct audit_cap_data	new_pcap;
+};
+
+struct audit_aux_data_capset {
+	struct audit_aux_data	d;
+	pid_t			pid;
+	struct audit_cap_data	cap;
+};
+
 struct audit_tree_refs {
 	struct audit_tree_refs *next;
 	struct audit_chunk *c[31];
@@ -421,6 +447,7 @@ static int audit_filter_rules(struct task_struct *tsk,
 			      struct audit_names *name,
 			      enum audit_state *state)
 {
+	const struct cred *cred = get_task_cred(tsk);
 	int i, j, need_sid = 1;
 	u32 sid;
 
@@ -440,28 +467,28 @@ static int audit_filter_rules(struct task_struct *tsk,
 			}
 			break;
 		case AUDIT_UID:
-			result = audit_comparator(tsk->uid, f->op, f->val);
+			result = audit_comparator(cred->uid, f->op, f->val);
 			break;
 		case AUDIT_EUID:
-			result = audit_comparator(tsk->euid, f->op, f->val);
+			result = audit_comparator(cred->euid, f->op, f->val);
 			break;
 		case AUDIT_SUID:
-			result = audit_comparator(tsk->suid, f->op, f->val);
+			result = audit_comparator(cred->suid, f->op, f->val);
 			break;
 		case AUDIT_FSUID:
-			result = audit_comparator(tsk->fsuid, f->op, f->val);
+			result = audit_comparator(cred->fsuid, f->op, f->val);
 			break;
 		case AUDIT_GID:
-			result = audit_comparator(tsk->gid, f->op, f->val);
+			result = audit_comparator(cred->gid, f->op, f->val);
 			break;
 		case AUDIT_EGID:
-			result = audit_comparator(tsk->egid, f->op, f->val);
+			result = audit_comparator(cred->egid, f->op, f->val);
 			break;
 		case AUDIT_SGID:
-			result = audit_comparator(tsk->sgid, f->op, f->val);
+			result = audit_comparator(cred->sgid, f->op, f->val);
 			break;
 		case AUDIT_FSGID:
-			result = audit_comparator(tsk->fsgid, f->op, f->val);
+			result = audit_comparator(cred->fsgid, f->op, f->val);
 			break;
 		case AUDIT_PERS:
 			result = audit_comparator(tsk->personality, f->op, f->val);
@@ -615,8 +642,10 @@ static int audit_filter_rules(struct task_struct *tsk,
 			break;
 		}
 
-		if (!result)
+		if (!result) {
+			put_cred(cred);
 			return 0;
+		}
 	}
 	if (rule->filterkey && ctx)
 		ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
@@ -624,6 +653,7 @@ static int audit_filter_rules(struct task_struct *tsk,
 	case AUDIT_NEVER:    *state = AUDIT_DISABLED;	    break;
 	case AUDIT_ALWAYS:   *state = AUDIT_RECORD_CONTEXT; break;
 	}
+	put_cred(cred);
 	return 1;
 }
 
@@ -1171,8 +1201,38 @@ static void audit_log_execve_info(struct audit_context *context,
 	kfree(buf);
 }
 
+static void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
+{
+	int i;
+
+	audit_log_format(ab, " %s=", prefix);
+	CAP_FOR_EACH_U32(i) {
+		audit_log_format(ab, "%08x", cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]);
+	}
+}
+
+static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
+{
+	kernel_cap_t *perm = &name->fcap.permitted;
+	kernel_cap_t *inh = &name->fcap.inheritable;
+	int log = 0;
+
+	if (!cap_isclear(*perm)) {
+		audit_log_cap(ab, "cap_fp", perm);
+		log = 1;
+	}
+	if (!cap_isclear(*inh)) {
+		audit_log_cap(ab, "cap_fi", inh);
+		log = 1;
+	}
+
+	if (log)
+		audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver);
+}
+
 static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
 {
+	const struct cred *cred;
 	int i, call_panic = 0;
 	struct audit_buffer *ab;
 	struct audit_aux_data *aux;
@@ -1182,14 +1242,15 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
 	context->pid = tsk->pid;
 	if (!context->ppid)
 		context->ppid = sys_getppid();
-	context->uid = tsk->uid;
-	context->gid = tsk->gid;
-	context->euid = tsk->euid;
-	context->suid = tsk->suid;
-	context->fsuid = tsk->fsuid;
-	context->egid = tsk->egid;
-	context->sgid = tsk->sgid;
-	context->fsgid = tsk->fsgid;
+	cred = current_cred();
+	context->uid   = cred->uid;
+	context->gid   = cred->gid;
+	context->euid  = cred->euid;
+	context->suid  = cred->suid;
+	context->fsuid = cred->fsuid;
+	context->egid  = cred->egid;
+	context->sgid  = cred->sgid;
+	context->fsgid = cred->fsgid;
 	context->personality = tsk->personality;
 
 	ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
@@ -1334,6 +1395,28 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
 			audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]);
 			break; }
 
+		case AUDIT_BPRM_FCAPS: {
+			struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
+			audit_log_format(ab, "fver=%x", axs->fcap_ver);
+			audit_log_cap(ab, "fp", &axs->fcap.permitted);
+			audit_log_cap(ab, "fi", &axs->fcap.inheritable);
+			audit_log_format(ab, " fe=%d", axs->fcap.fE);
+			audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
+			audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
+			audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
+			audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted);
+			audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable);
+			audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
+			break; }
+
+		case AUDIT_CAPSET: {
+			struct audit_aux_data_capset *axs = (void *)aux;
+			audit_log_format(ab, "pid=%d", axs->pid);
+			audit_log_cap(ab, "cap_pi", &axs->cap.inheritable);
+			audit_log_cap(ab, "cap_pp", &axs->cap.permitted);
+			audit_log_cap(ab, "cap_pe", &axs->cap.effective);
+			break; }
+
 		}
 		audit_log_end(ab);
 	}
@@ -1421,6 +1504,8 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
 			}
 		}
 
+		audit_log_fcaps(ab, n);
+
 		audit_log_end(ab);
 	}
 
@@ -1459,7 +1544,6 @@ void audit_free(struct task_struct *tsk)
 
 /**
  * audit_syscall_entry - fill in an audit record at syscall entry
- * @tsk: task being audited
  * @arch: architecture type
  * @major: major syscall type (function)
  * @a1: additional syscall register 1
@@ -1548,9 +1632,25 @@ void audit_syscall_entry(int arch, int major,
 	context->ppid       = 0;
 }
 
+void audit_finish_fork(struct task_struct *child)
+{
+	struct audit_context *ctx = current->audit_context;
+	struct audit_context *p = child->audit_context;
+	if (!p || !ctx || !ctx->auditable)
+		return;
+	p->arch = ctx->arch;
+	p->major = ctx->major;
+	memcpy(p->argv, ctx->argv, sizeof(ctx->argv));
+	p->ctime = ctx->ctime;
+	p->dummy = ctx->dummy;
+	p->auditable = ctx->auditable;
+	p->in_syscall = ctx->in_syscall;
+	p->filterkey = kstrdup(ctx->filterkey, GFP_KERNEL);
+	p->ppid = current->pid;
+}
+
 /**
  * audit_syscall_exit - deallocate audit context after a system call
- * @tsk: task being audited
  * @valid: success/failure flag
  * @return_code: syscall return value
  *
@@ -1787,8 +1887,36 @@ static int audit_inc_name_count(struct audit_context *context,
 	return 0;
 }
 
+
+static inline int audit_copy_fcaps(struct audit_names *name, const struct dentry *dentry)
+{
+	struct cpu_vfs_cap_data caps;
+	int rc;
+
+	memset(&name->fcap.permitted, 0, sizeof(kernel_cap_t));
+	memset(&name->fcap.inheritable, 0, sizeof(kernel_cap_t));
+	name->fcap.fE = 0;
+	name->fcap_ver = 0;
+
+	if (!dentry)
+		return 0;
+
+	rc = get_vfs_caps_from_disk(dentry, &caps);
+	if (rc)
+		return rc;
+
+	name->fcap.permitted = caps.permitted;
+	name->fcap.inheritable = caps.inheritable;
+	name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
+	name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
+
+	return 0;
+}
+
+
 /* Copy inode data into an audit_names. */
-static void audit_copy_inode(struct audit_names *name, const struct inode *inode)
+static void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
+			     const struct inode *inode)
 {
 	name->ino   = inode->i_ino;
 	name->dev   = inode->i_sb->s_dev;
@@ -1797,6 +1925,7 @@ static void audit_copy_inode(struct audit_names *name, const struct inode *inode
 	name->gid   = inode->i_gid;
 	name->rdev  = inode->i_rdev;
 	security_inode_getsecid(inode, &name->osid);
+	audit_copy_fcaps(name, dentry);
 }
 
 /**
@@ -1831,7 +1960,7 @@ void __audit_inode(const char *name, const struct dentry *dentry)
 		context->names[idx].name = NULL;
 	}
 	handle_path(dentry);
-	audit_copy_inode(&context->names[idx], inode);
+	audit_copy_inode(&context->names[idx], dentry, inode);
 }
 
 /**
@@ -1892,7 +2021,7 @@ void __audit_inode_child(const char *dname, const struct dentry *dentry,
 		if (!strcmp(dname, n->name) ||
 		     !audit_compare_dname_path(dname, n->name, &dirlen)) {
 			if (inode)
-				audit_copy_inode(n, inode);
+				audit_copy_inode(n, NULL, inode);
 			else
 				n->ino = (unsigned long)-1;
 			found_child = n->name;
@@ -1906,7 +2035,7 @@ add_names:
 			return;
 		idx = context->name_count - 1;
 		context->names[idx].name = NULL;
-		audit_copy_inode(&context->names[idx], parent);
+		audit_copy_inode(&context->names[idx], NULL, parent);
 	}
 
 	if (!found_child) {
@@ -1927,7 +2056,7 @@ add_names:
 		}
 
 		if (inode)
-			audit_copy_inode(&context->names[idx], inode);
+			audit_copy_inode(&context->names[idx], NULL, inode);
 		else
 			context->names[idx].ino = (unsigned long)-1;
 	}
@@ -1942,15 +2071,18 @@ EXPORT_SYMBOL_GPL(__audit_inode_child);
  *
  * Also sets the context as auditable.
  */
-void auditsc_get_stamp(struct audit_context *ctx,
+int auditsc_get_stamp(struct audit_context *ctx,
 		       struct timespec *t, unsigned int *serial)
 {
+	if (!ctx->in_syscall)
+		return 0;
 	if (!ctx->serial)
 		ctx->serial = audit_serial();
 	t->tv_sec  = ctx->ctime.tv_sec;
 	t->tv_nsec = ctx->ctime.tv_nsec;
 	*serial    = ctx->serial;
 	ctx->auditable = 1;
+	return 1;
 }
 
 /* global counter which is incremented every time something logs in */
@@ -1978,7 +2110,7 @@ int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
 			audit_log_format(ab, "login pid=%d uid=%u "
 				"old auid=%u new auid=%u"
 				" old ses=%u new ses=%u",
-				task->pid, task->uid,
+				task->pid, task_uid(task),
 				task->loginuid, loginuid,
 				task->sessionid, sessionid);
 			audit_log_end(ab);
@@ -2361,7 +2493,7 @@ void __audit_ptrace(struct task_struct *t)
 
 	context->target_pid = t->pid;
 	context->target_auid = audit_get_loginuid(t);
-	context->target_uid = t->uid;
+	context->target_uid = task_uid(t);
 	context->target_sessionid = audit_get_sessionid(t);
 	security_task_getsecid(t, &context->target_sid);
 	memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
@@ -2380,6 +2512,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
 	struct audit_aux_data_pids *axp;
 	struct task_struct *tsk = current;
 	struct audit_context *ctx = tsk->audit_context;
+	uid_t uid = current_uid(), t_uid = task_uid(t);
 
 	if (audit_pid && t->tgid == audit_pid) {
 		if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
@@ -2387,7 +2520,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
 			if (tsk->loginuid != -1)
 				audit_sig_uid = tsk->loginuid;
 			else
-				audit_sig_uid = tsk->uid;
+				audit_sig_uid = uid;
 			security_task_getsecid(tsk, &audit_sig_sid);
 		}
 		if (!audit_signals || audit_dummy_context())
@@ -2399,7 +2532,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
 	if (!ctx->target_pid) {
 		ctx->target_pid = t->tgid;
 		ctx->target_auid = audit_get_loginuid(t);
-		ctx->target_uid = t->uid;
+		ctx->target_uid = t_uid;
 		ctx->target_sessionid = audit_get_sessionid(t);
 		security_task_getsecid(t, &ctx->target_sid);
 		memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
@@ -2420,7 +2553,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
 
 	axp->target_pid[axp->pid_count] = t->tgid;
 	axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
-	axp->target_uid[axp->pid_count] = t->uid;
+	axp->target_uid[axp->pid_count] = t_uid;
 	axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
 	security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
 	memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
@@ -2430,6 +2563,86 @@ int __audit_signal_info(int sig, struct task_struct *t)
 }
 
 /**
+ * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
+ * @bprm: pointer to the bprm being processed
+ * @new: the proposed new credentials
+ * @old: the old credentials
+ *
+ * Simply check if the proc already has the caps given by the file and if not
+ * store the priv escalation info for later auditing at the end of the syscall
+ *
+ * -Eric
+ */
+int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
+			   const struct cred *new, const struct cred *old)
+{
+	struct audit_aux_data_bprm_fcaps *ax;
+	struct audit_context *context = current->audit_context;
+	struct cpu_vfs_cap_data vcaps;
+	struct dentry *dentry;
+
+	ax = kmalloc(sizeof(*ax), GFP_KERNEL);
+	if (!ax)
+		return -ENOMEM;
+
+	ax->d.type = AUDIT_BPRM_FCAPS;
+	ax->d.next = context->aux;
+	context->aux = (void *)ax;
+
+	dentry = dget(bprm->file->f_dentry);
+	get_vfs_caps_from_disk(dentry, &vcaps);
+	dput(dentry);
+
+	ax->fcap.permitted = vcaps.permitted;
+	ax->fcap.inheritable = vcaps.inheritable;
+	ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
+	ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
+
+	ax->old_pcap.permitted   = old->cap_permitted;
+	ax->old_pcap.inheritable = old->cap_inheritable;
+	ax->old_pcap.effective   = old->cap_effective;
+
+	ax->new_pcap.permitted   = new->cap_permitted;
+	ax->new_pcap.inheritable = new->cap_inheritable;
+	ax->new_pcap.effective   = new->cap_effective;
+	return 0;
+}
+
+/**
+ * __audit_log_capset - store information about the arguments to the capset syscall
+ * @pid: target pid of the capset call
+ * @new: the new credentials
+ * @old: the old (current) credentials
+ *
+ * Record the aguments userspace sent to sys_capset for later printing by the
+ * audit system if applicable
+ */
+int __audit_log_capset(pid_t pid,
+		       const struct cred *new, const struct cred *old)
+{
+	struct audit_aux_data_capset *ax;
+	struct audit_context *context = current->audit_context;
+
+	if (likely(!audit_enabled || !context || context->dummy))
+		return 0;
+
+	ax = kmalloc(sizeof(*ax), GFP_KERNEL);
+	if (!ax)
+		return -ENOMEM;
+
+	ax->d.type = AUDIT_CAPSET;
+	ax->d.next = context->aux;
+	context->aux = (void *)ax;
+
+	ax->pid = pid;
+	ax->cap.effective   = new->cap_effective;
+	ax->cap.inheritable = new->cap_effective;
+	ax->cap.permitted   = new->cap_permitted;
+
+	return 0;
+}
+
+/**
  * audit_core_dumps - record information about processes that end abnormally
  * @signr: signal value
  *
@@ -2440,7 +2653,8 @@ void audit_core_dumps(long signr)
 {
 	struct audit_buffer *ab;
 	u32 sid;
-	uid_t auid = audit_get_loginuid(current);
+	uid_t auid = audit_get_loginuid(current), uid;
+	gid_t gid;
 	unsigned int sessionid = audit_get_sessionid(current);
 
 	if (!audit_enabled)
@@ -2450,8 +2664,9 @@ void audit_core_dumps(long signr)
 		return;
 
 	ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
+	current_uid_gid(&uid, &gid);
 	audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
-			auid, current->uid, current->gid, sessionid);
+			 auid, uid, gid, sessionid);
 	security_task_getsecid(current, &sid);
 	if (sid) {
 		char *ctx = NULL;
diff --git a/kernel/capability.c b/kernel/capability.c
index 33e51e78c2d8..36b4b4daebec 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -7,6 +7,7 @@
  * 30 May 2002:	Cleanup, Robert M. Love <rml@tech9.net>
  */
 
+#include <linux/audit.h>
 #include <linux/capability.h>
 #include <linux/mm.h>
 #include <linux/module.h>
@@ -14,12 +15,7 @@
 #include <linux/syscalls.h>
 #include <linux/pid_namespace.h>
 #include <asm/uaccess.h>
-
-/*
- * This lock protects task->cap_* for all tasks including current.
- * Locking rule: acquire this prior to tasklist_lock.
- */
-static DEFINE_SPINLOCK(task_capability_lock);
+#include "cred-internals.h"
 
 /*
  * Leveraged for setting/resetting capabilities
@@ -33,6 +29,17 @@ EXPORT_SYMBOL(__cap_empty_set);
 EXPORT_SYMBOL(__cap_full_set);
 EXPORT_SYMBOL(__cap_init_eff_set);
 
+#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
+int file_caps_enabled = 1;
+
+static int __init file_caps_disable(char *str)
+{
+	file_caps_enabled = 0;
+	return 1;
+}
+__setup("no_file_caps", file_caps_disable);
+#endif
+
 /*
  * More recent versions of libcap are available from:
  *
@@ -115,167 +122,12 @@ static int cap_validate_magic(cap_user_header_t header, unsigned *tocopy)
 	return 0;
 }
 
-#ifndef CONFIG_SECURITY_FILE_CAPABILITIES
-
-/*
- * Without filesystem capability support, we nominally support one process
- * setting the capabilities of another
- */
-static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
-				     kernel_cap_t *pIp, kernel_cap_t *pPp)
-{
-	struct task_struct *target;
-	int ret;
-
-	spin_lock(&task_capability_lock);
-	read_lock(&tasklist_lock);
-
-	if (pid && pid != task_pid_vnr(current)) {
-		target = find_task_by_vpid(pid);
-		if (!target) {
-			ret = -ESRCH;
-			goto out;
-		}
-	} else
-		target = current;
-
-	ret = security_capget(target, pEp, pIp, pPp);
-
-out:
-	read_unlock(&tasklist_lock);
-	spin_unlock(&task_capability_lock);
-
-	return ret;
-}
-
-/*
- * cap_set_pg - set capabilities for all processes in a given process
- * group.  We call this holding task_capability_lock and tasklist_lock.
- */
-static inline int cap_set_pg(int pgrp_nr, kernel_cap_t *effective,
-			     kernel_cap_t *inheritable,
-			     kernel_cap_t *permitted)
-{
-	struct task_struct *g, *target;
-	int ret = -EPERM;
-	int found = 0;
-	struct pid *pgrp;
-
-	spin_lock(&task_capability_lock);
-	read_lock(&tasklist_lock);
-
-	pgrp = find_vpid(pgrp_nr);
-	do_each_pid_task(pgrp, PIDTYPE_PGID, g) {
-		target = g;
-		while_each_thread(g, target) {
-			if (!security_capset_check(target, effective,
-						   inheritable, permitted)) {
-				security_capset_set(target, effective,
-						    inheritable, permitted);
-				ret = 0;
-			}
-			found = 1;
-		}
-	} while_each_pid_task(pgrp, PIDTYPE_PGID, g);
-
-	read_unlock(&tasklist_lock);
-	spin_unlock(&task_capability_lock);
-
-	if (!found)
-		ret = 0;
-	return ret;
-}
-
-/*
- * cap_set_all - set capabilities for all processes other than init
- * and self.  We call this holding task_capability_lock and tasklist_lock.
- */
-static inline int cap_set_all(kernel_cap_t *effective,
-			      kernel_cap_t *inheritable,
-			      kernel_cap_t *permitted)
-{
-	struct task_struct *g, *target;
-	int ret = -EPERM;
-	int found = 0;
-
-	spin_lock(&task_capability_lock);
-	read_lock(&tasklist_lock);
-
-	do_each_thread(g, target) {
-		if (target == current
-		    || is_container_init(target->group_leader))
-			continue;
-		found = 1;
-		if (security_capset_check(target, effective, inheritable,
-					  permitted))
-			continue;
-		ret = 0;
-		security_capset_set(target, effective, inheritable, permitted);
-	} while_each_thread(g, target);
-
-	read_unlock(&tasklist_lock);
-	spin_unlock(&task_capability_lock);
-
-	if (!found)
-		ret = 0;
-
-	return ret;
-}
-
-/*
- * Given the target pid does not refer to the current process we
- * need more elaborate support... (This support is not present when
- * filesystem capabilities are configured.)
- */
-static inline int do_sys_capset_other_tasks(pid_t pid, kernel_cap_t *effective,
-					    kernel_cap_t *inheritable,
-					    kernel_cap_t *permitted)
-{
-	struct task_struct *target;
-	int ret;
-
-	if (!capable(CAP_SETPCAP))
-		return -EPERM;
-
-	if (pid == -1)	          /* all procs other than current and init */
-		return cap_set_all(effective, inheritable, permitted);
-
-	else if (pid < 0)                    /* all procs in process group */
-		return cap_set_pg(-pid, effective, inheritable, permitted);
-
-	/* target != current */
-	spin_lock(&task_capability_lock);
-	read_lock(&tasklist_lock);
-
-	target = find_task_by_vpid(pid);
-	if (!target)
-		ret = -ESRCH;
-	else {
-		ret = security_capset_check(target, effective, inheritable,
-					    permitted);
-
-		/* having verified that the proposed changes are legal,
-		   we now put them into effect. */
-		if (!ret)
-			security_capset_set(target, effective, inheritable,
-					    permitted);
-	}
-
-	read_unlock(&tasklist_lock);
-	spin_unlock(&task_capability_lock);
-
-	return ret;
-}
-
-#else /* ie., def CONFIG_SECURITY_FILE_CAPABILITIES */
-
 /*
- * If we have configured with filesystem capability support, then the
- * only thing that can change the capabilities of the current process
- * is the current process. As such, we can't be in this code at the
- * same time as we are in the process of setting capabilities in this
- * process. The net result is that we can limit our use of locks to
- * when we are reading the caps of another process.
+ * The only thing that can change the capabilities of the current
+ * process is the current process. As such, we can't be in this code
+ * at the same time as we are in the process of setting capabilities
+ * in this process. The net result is that we can limit our use of
+ * locks to when we are reading the caps of another process.
  */
 static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
 				     kernel_cap_t *pIp, kernel_cap_t *pPp)
@@ -285,7 +137,6 @@ static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
 	if (pid && (pid != task_pid_vnr(current))) {
 		struct task_struct *target;
 
-		spin_lock(&task_capability_lock);
 		read_lock(&tasklist_lock);
 
 		target = find_task_by_vpid(pid);
@@ -295,50 +146,12 @@ static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
 			ret = security_capget(target, pEp, pIp, pPp);
 
 		read_unlock(&tasklist_lock);
-		spin_unlock(&task_capability_lock);
 	} else
 		ret = security_capget(current, pEp, pIp, pPp);
 
 	return ret;
 }
 
-/*
- * With filesystem capability support configured, the kernel does not
- * permit the changing of capabilities in one process by another
- * process. (CAP_SETPCAP has much less broad semantics when configured
- * this way.)
- */
-static inline int do_sys_capset_other_tasks(pid_t pid,
-					    kernel_cap_t *effective,
-					    kernel_cap_t *inheritable,
-					    kernel_cap_t *permitted)
-{
-	return -EPERM;
-}
-
-#endif /* ie., ndef CONFIG_SECURITY_FILE_CAPABILITIES */
-
-/*
- * Atomically modify the effective capabilities returning the original
- * value. No permission check is performed here - it is assumed that the
- * caller is permitted to set the desired effective capabilities.
- */
-kernel_cap_t cap_set_effective(const kernel_cap_t pE_new)
-{
-	kernel_cap_t pE_old;
-
-	spin_lock(&task_capability_lock);
-
-	pE_old = current->cap_effective;
-	current->cap_effective = pE_new;
-
-	spin_unlock(&task_capability_lock);
-
-	return pE_old;
-}
-
-EXPORT_SYMBOL(cap_set_effective);
-
 /**
  * sys_capget - get the capabilities of a given process.
  * @header: pointer to struct that contains capability version and
@@ -366,7 +179,6 @@ asmlinkage long sys_capget(cap_user_header_t header, cap_user_data_t dataptr)
 		return -EINVAL;
 
 	ret = cap_get_target_pid(pid, &pE, &pI, &pP);
-
 	if (!ret) {
 		struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S];
 		unsigned i;
@@ -412,16 +224,14 @@ asmlinkage long sys_capget(cap_user_header_t header, cap_user_data_t dataptr)
  * @data: pointer to struct that contains the effective, permitted,
  *	and inheritable capabilities
  *
- * Set capabilities for a given process, all processes, or all
- * processes in a given process group.
+ * Set capabilities for the current process only.  The ability to any other
+ * process(es) has been deprecated and removed.
  *
  * The restrictions on setting capabilities are specified as:
  *
- * [pid is for the 'target' task.  'current' is the calling task.]
- *
- * I: any raised capabilities must be a subset of the (old current) permitted
- * P: any raised capabilities must be a subset of the (old current) permitted
- * E: must be set to a subset of (new target) permitted
+ * I: any raised capabilities must be a subset of the old permitted
+ * P: any raised capabilities must be a subset of the old permitted
+ * E: must be set to a subset of new permitted
  *
  * Returns 0 on success and < 0 on error.
  */
@@ -430,6 +240,7 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
 	struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S];
 	unsigned i, tocopy;
 	kernel_cap_t inheritable, permitted, effective;
+	struct cred *new;
 	int ret;
 	pid_t pid;
 
@@ -440,10 +251,13 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
 	if (get_user(pid, &header->pid))
 		return -EFAULT;
 
-	if (copy_from_user(&kdata, data, tocopy
-			   * sizeof(struct __user_cap_data_struct))) {
+	/* may only affect current now */
+	if (pid != 0 && pid != task_pid_vnr(current))
+		return -EPERM;
+
+	if (copy_from_user(&kdata, data,
+			   tocopy * sizeof(struct __user_cap_data_struct)))
 		return -EFAULT;
-	}
 
 	for (i = 0; i < tocopy; i++) {
 		effective.cap[i] = kdata[i].effective;
@@ -457,32 +271,23 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
 		i++;
 	}
 
-	if (pid && (pid != task_pid_vnr(current)))
-		ret = do_sys_capset_other_tasks(pid, &effective, &inheritable,
-						&permitted);
-	else {
-		/*
-		 * This lock is required even when filesystem
-		 * capability support is configured - it protects the
-		 * sys_capget() call from returning incorrect data in
-		 * the case that the targeted process is not the
-		 * current one.
-		 */
-		spin_lock(&task_capability_lock);
+	new = prepare_creds();
+	if (!new)
+		return -ENOMEM;
 
-		ret = security_capset_check(current, &effective, &inheritable,
-					    &permitted);
-		/*
-		 * Having verified that the proposed changes are
-		 * legal, we now put them into effect.
-		 */
-		if (!ret)
-			security_capset_set(current, &effective, &inheritable,
-					    &permitted);
-		spin_unlock(&task_capability_lock);
-	}
+	ret = security_capset(new, current_cred(),
+			      &effective, &inheritable, &permitted);
+	if (ret < 0)
+		goto error;
+
+	ret = audit_log_capset(pid, new, current_cred());
+	if (ret < 0)
+		return ret;
 
+	return commit_creds(new);
 
+error:
+	abort_creds(new);
 	return ret;
 }
 
@@ -498,6 +303,11 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
  */
 int capable(int cap)
 {
+	if (unlikely(!cap_valid(cap))) {
+		printk(KERN_CRIT "capable() called with invalid cap=%u\n", cap);
+		BUG();
+	}
+
 	if (has_capability(current, cap)) {
 		current->flags |= PF_SUPERPRIV;
 		return 1;
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a0123d75ec9a..48348dde6d81 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -241,7 +241,6 @@ static void unlink_css_set(struct css_set *cg)
 	struct cg_cgroup_link *link;
 	struct cg_cgroup_link *saved_link;
 
-	write_lock(&css_set_lock);
 	hlist_del(&cg->hlist);
 	css_set_count--;
 
@@ -251,16 +250,25 @@ static void unlink_css_set(struct css_set *cg)
 		list_del(&link->cgrp_link_list);
 		kfree(link);
 	}
-
-	write_unlock(&css_set_lock);
 }
 
-static void __release_css_set(struct kref *k, int taskexit)
+static void __put_css_set(struct css_set *cg, int taskexit)
 {
 	int i;
-	struct css_set *cg = container_of(k, struct css_set, ref);
-
+	/*
+	 * Ensure that the refcount doesn't hit zero while any readers
+	 * can see it. Similar to atomic_dec_and_lock(), but for an
+	 * rwlock
+	 */
+	if (atomic_add_unless(&cg->refcount, -1, 1))
+		return;
+	write_lock(&css_set_lock);
+	if (!atomic_dec_and_test(&cg->refcount)) {
+		write_unlock(&css_set_lock);
+		return;
+	}
 	unlink_css_set(cg);
+	write_unlock(&css_set_lock);
 
 	rcu_read_lock();
 	for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
@@ -276,32 +284,22 @@ static void __release_css_set(struct kref *k, int taskexit)
 	kfree(cg);
 }
 
-static void release_css_set(struct kref *k)
-{
-	__release_css_set(k, 0);
-}
-
-static void release_css_set_taskexit(struct kref *k)
-{
-	__release_css_set(k, 1);
-}
-
 /*
  * refcounted get/put for css_set objects
  */
 static inline void get_css_set(struct css_set *cg)
 {
-	kref_get(&cg->ref);
+	atomic_inc(&cg->refcount);
 }
 
 static inline void put_css_set(struct css_set *cg)
 {
-	kref_put(&cg->ref, release_css_set);
+	__put_css_set(cg, 0);
 }
 
 static inline void put_css_set_taskexit(struct css_set *cg)
 {
-	kref_put(&cg->ref, release_css_set_taskexit);
+	__put_css_set(cg, 1);
 }
 
 /*
@@ -427,7 +425,7 @@ static struct css_set *find_css_set(
 		return NULL;
 	}
 
-	kref_init(&res->ref);
+	atomic_set(&res->refcount, 1);
 	INIT_LIST_HEAD(&res->cg_links);
 	INIT_LIST_HEAD(&res->tasks);
 	INIT_HLIST_NODE(&res->hlist);
@@ -573,8 +571,8 @@ static struct inode *cgroup_new_inode(mode_t mode, struct super_block *sb)
 
 	if (inode) {
 		inode->i_mode = mode;
-		inode->i_uid = current->fsuid;
-		inode->i_gid = current->fsgid;
+		inode->i_uid = current_fsuid();
+		inode->i_gid = current_fsgid();
 		inode->i_blocks = 0;
 		inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 		inode->i_mapping->backing_dev_info = &cgroup_backing_dev_info;
@@ -704,7 +702,7 @@ static int rebind_subsystems(struct cgroupfs_root *root,
 	 * any child cgroups exist. This is theoretically supportable
 	 * but involves complex error handling, so it's being left until
 	 * later */
-	if (!list_empty(&cgrp->children))
+	if (root->number_of_cgroups > 1)
 		return -EBUSY;
 
 	/* Process each subsystem */
@@ -870,6 +868,14 @@ static struct super_operations cgroup_ops = {
 	.remount_fs = cgroup_remount,
 };
 
+static void init_cgroup_housekeeping(struct cgroup *cgrp)
+{
+	INIT_LIST_HEAD(&cgrp->sibling);
+	INIT_LIST_HEAD(&cgrp->children);
+	INIT_LIST_HEAD(&cgrp->css_sets);
+	INIT_LIST_HEAD(&cgrp->release_list);
+	init_rwsem(&cgrp->pids_mutex);
+}
 static void init_cgroup_root(struct cgroupfs_root *root)
 {
 	struct cgroup *cgrp = &root->top_cgroup;
@@ -878,10 +884,7 @@ static void init_cgroup_root(struct cgroupfs_root *root)
 	root->number_of_cgroups = 1;
 	cgrp->root = root;
 	cgrp->top_cgroup = cgrp;
-	INIT_LIST_HEAD(&cgrp->sibling);
-	INIT_LIST_HEAD(&cgrp->children);
-	INIT_LIST_HEAD(&cgrp->css_sets);
-	INIT_LIST_HEAD(&cgrp->release_list);
+	init_cgroup_housekeeping(cgrp);
 }
 
 static int cgroup_test_super(struct super_block *sb, void *data)
@@ -1021,7 +1024,7 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
 		if (ret == -EBUSY) {
 			mutex_unlock(&cgroup_mutex);
 			mutex_unlock(&inode->i_mutex);
-			goto drop_new_super;
+			goto free_cg_links;
 		}
 
 		/* EBUSY should be the only error here */
@@ -1070,10 +1073,11 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
 
 	return simple_set_mnt(mnt, sb);
 
+ free_cg_links:
+	free_cg_links(&tmp_cg_links);
  drop_new_super:
 	up_write(&sb->s_umount);
 	deactivate_super(sb);
-	free_cg_links(&tmp_cg_links);
 	return ret;
 }
 
@@ -1276,6 +1280,7 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
 static int attach_task_by_pid(struct cgroup *cgrp, u64 pid)
 {
 	struct task_struct *tsk;
+	const struct cred *cred = current_cred(), *tcred;
 	int ret;
 
 	if (pid) {
@@ -1285,14 +1290,16 @@ static int attach_task_by_pid(struct cgroup *cgrp, u64 pid)
 			rcu_read_unlock();
 			return -ESRCH;
 		}
-		get_task_struct(tsk);
-		rcu_read_unlock();
 
-		if ((current->euid) && (current->euid != tsk->uid)
-		    && (current->euid != tsk->suid)) {
-			put_task_struct(tsk);
+		tcred = __task_cred(tsk);
+		if (cred->euid &&
+		    cred->euid != tcred->uid &&
+		    cred->euid != tcred->suid) {
+			rcu_read_unlock();
 			return -EACCES;
 		}
+		get_task_struct(tsk);
+		rcu_read_unlock();
 	} else {
 		tsk = current;
 		get_task_struct(tsk);
@@ -1728,7 +1735,7 @@ int cgroup_task_count(const struct cgroup *cgrp)
 
 	read_lock(&css_set_lock);
 	list_for_each_entry(link, &cgrp->css_sets, cgrp_link_list) {
-		count += atomic_read(&link->cg->ref.refcount);
+		count += atomic_read(&link->cg->refcount);
 	}
 	read_unlock(&css_set_lock);
 	return count;
@@ -1997,16 +2004,7 @@ int cgroup_scan_tasks(struct cgroup_scanner *scan)
  * but we cannot guarantee that the information we produce is correct
  * unless we produce it entirely atomically.
  *
- * Upon tasks file open(), a struct ctr_struct is allocated, that
- * will have a pointer to an array (also allocated here).  The struct
- * ctr_struct * is stored in file->private_data.  Its resources will
- * be freed by release() when the file is closed.  The array is used
- * to sprintf the PIDs and then used by read().
  */
-struct ctr_struct {
-	char *buf;
-	int bufsz;
-};
 
 /*
  * Load into 'pidarray' up to 'npids' of the tasks using cgroup
@@ -2045,10 +2043,13 @@ int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry)
 	struct cgroup *cgrp;
 	struct cgroup_iter it;
 	struct task_struct *tsk;
+
 	/*
-	 * Validate dentry by checking the superblock operations
+	 * Validate dentry by checking the superblock operations,
+	 * and make sure it's a directory.
 	 */
-	if (dentry->d_sb->s_op != &cgroup_ops)
+	if (dentry->d_sb->s_op != &cgroup_ops ||
+	    !S_ISDIR(dentry->d_inode->i_mode))
 		 goto err;
 
 	ret = 0;
@@ -2088,42 +2089,132 @@ static int cmppid(const void *a, const void *b)
 	return *(pid_t *)a - *(pid_t *)b;
 }
 
+
 /*
- * Convert array 'a' of 'npids' pid_t's to a string of newline separated
- * decimal pids in 'buf'.  Don't write more than 'sz' chars, but return
- * count 'cnt' of how many chars would be written if buf were large enough.
+ * seq_file methods for the "tasks" file. The seq_file position is the
+ * next pid to display; the seq_file iterator is a pointer to the pid
+ * in the cgroup->tasks_pids array.
  */
-static int pid_array_to_buf(char *buf, int sz, pid_t *a, int npids)
+
+static void *cgroup_tasks_start(struct seq_file *s, loff_t *pos)
 {
-	int cnt = 0;
-	int i;
+	/*
+	 * Initially we receive a position value that corresponds to
+	 * one more than the last pid shown (or 0 on the first call or
+	 * after a seek to the start). Use a binary-search to find the
+	 * next pid to display, if any
+	 */
+	struct cgroup *cgrp = s->private;
+	int index = 0, pid = *pos;
+	int *iter;
+
+	down_read(&cgrp->pids_mutex);
+	if (pid) {
+		int end = cgrp->pids_length;
+
+		while (index < end) {
+			int mid = (index + end) / 2;
+			if (cgrp->tasks_pids[mid] == pid) {
+				index = mid;
+				break;
+			} else if (cgrp->tasks_pids[mid] <= pid)
+				index = mid + 1;
+			else
+				end = mid;
+		}
+	}
+	/* If we're off the end of the array, we're done */
+	if (index >= cgrp->pids_length)
+		return NULL;
+	/* Update the abstract position to be the actual pid that we found */
+	iter = cgrp->tasks_pids + index;
+	*pos = *iter;
+	return iter;
+}
+
+static void cgroup_tasks_stop(struct seq_file *s, void *v)
+{
+	struct cgroup *cgrp = s->private;
+	up_read(&cgrp->pids_mutex);
+}
+
+static void *cgroup_tasks_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	struct cgroup *cgrp = s->private;
+	int *p = v;
+	int *end = cgrp->tasks_pids + cgrp->pids_length;
+
+	/*
+	 * Advance to the next pid in the array. If this goes off the
+	 * end, we're done
+	 */
+	p++;
+	if (p >= end) {
+		return NULL;
+	} else {
+		*pos = *p;
+		return p;
+	}
+}
 
-	for (i = 0; i < npids; i++)
-		cnt += snprintf(buf + cnt, max(sz - cnt, 0), "%d\n", a[i]);
-	return cnt;
+static int cgroup_tasks_show(struct seq_file *s, void *v)
+{
+	return seq_printf(s, "%d\n", *(int *)v);
 }
 
+static struct seq_operations cgroup_tasks_seq_operations = {
+	.start = cgroup_tasks_start,
+	.stop = cgroup_tasks_stop,
+	.next = cgroup_tasks_next,
+	.show = cgroup_tasks_show,
+};
+
+static void release_cgroup_pid_array(struct cgroup *cgrp)
+{
+	down_write(&cgrp->pids_mutex);
+	BUG_ON(!cgrp->pids_use_count);
+	if (!--cgrp->pids_use_count) {
+		kfree(cgrp->tasks_pids);
+		cgrp->tasks_pids = NULL;
+		cgrp->pids_length = 0;
+	}
+	up_write(&cgrp->pids_mutex);
+}
+
+static int cgroup_tasks_release(struct inode *inode, struct file *file)
+{
+	struct cgroup *cgrp = __d_cgrp(file->f_dentry->d_parent);
+
+	if (!(file->f_mode & FMODE_READ))
+		return 0;
+
+	release_cgroup_pid_array(cgrp);
+	return seq_release(inode, file);
+}
+
+static struct file_operations cgroup_tasks_operations = {
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.write = cgroup_file_write,
+	.release = cgroup_tasks_release,
+};
+
 /*
- * Handle an open on 'tasks' file.  Prepare a buffer listing the
+ * Handle an open on 'tasks' file.  Prepare an array containing the
  * process id's of tasks currently attached to the cgroup being opened.
- *
- * Does not require any specific cgroup mutexes, and does not take any.
  */
+
 static int cgroup_tasks_open(struct inode *unused, struct file *file)
 {
 	struct cgroup *cgrp = __d_cgrp(file->f_dentry->d_parent);
-	struct ctr_struct *ctr;
 	pid_t *pidarray;
 	int npids;
-	char c;
+	int retval;
 
+	/* Nothing to do for write-only files */
 	if (!(file->f_mode & FMODE_READ))
 		return 0;
 
-	ctr = kmalloc(sizeof(*ctr), GFP_KERNEL);
-	if (!ctr)
-		goto err0;
-
 	/*
 	 * If cgroup gets more users after we read count, we won't have
 	 * enough space - tough.  This race is indistinguishable to the
@@ -2131,57 +2222,31 @@ static int cgroup_tasks_open(struct inode *unused, struct file *file)
 	 * show up until sometime later on.
 	 */
 	npids = cgroup_task_count(cgrp);
-	if (npids) {
-		pidarray = kmalloc(npids * sizeof(pid_t), GFP_KERNEL);
-		if (!pidarray)
-			goto err1;
-
-		npids = pid_array_load(pidarray, npids, cgrp);
-		sort(pidarray, npids, sizeof(pid_t), cmppid, NULL);
-
-		/* Call pid_array_to_buf() twice, first just to get bufsz */
-		ctr->bufsz = pid_array_to_buf(&c, sizeof(c), pidarray, npids) + 1;
-		ctr->buf = kmalloc(ctr->bufsz, GFP_KERNEL);
-		if (!ctr->buf)
-			goto err2;
-		ctr->bufsz = pid_array_to_buf(ctr->buf, ctr->bufsz, pidarray, npids);
-
-		kfree(pidarray);
-	} else {
-		ctr->buf = NULL;
-		ctr->bufsz = 0;
-	}
-	file->private_data = ctr;
-	return 0;
-
-err2:
-	kfree(pidarray);
-err1:
-	kfree(ctr);
-err0:
-	return -ENOMEM;
-}
-
-static ssize_t cgroup_tasks_read(struct cgroup *cgrp,
-				    struct cftype *cft,
-				    struct file *file, char __user *buf,
-				    size_t nbytes, loff_t *ppos)
-{
-	struct ctr_struct *ctr = file->private_data;
+	pidarray = kmalloc(npids * sizeof(pid_t), GFP_KERNEL);
+	if (!pidarray)
+		return -ENOMEM;
+	npids = pid_array_load(pidarray, npids, cgrp);
+	sort(pidarray, npids, sizeof(pid_t), cmppid, NULL);
 
-	return simple_read_from_buffer(buf, nbytes, ppos, ctr->buf, ctr->bufsz);
-}
+	/*
+	 * Store the array in the cgroup, freeing the old
+	 * array if necessary
+	 */
+	down_write(&cgrp->pids_mutex);
+	kfree(cgrp->tasks_pids);
+	cgrp->tasks_pids = pidarray;
+	cgrp->pids_length = npids;
+	cgrp->pids_use_count++;
+	up_write(&cgrp->pids_mutex);
 
-static int cgroup_tasks_release(struct inode *unused_inode,
-					struct file *file)
-{
-	struct ctr_struct *ctr;
+	file->f_op = &cgroup_tasks_operations;
 
-	if (file->f_mode & FMODE_READ) {
-		ctr = file->private_data;
-		kfree(ctr->buf);
-		kfree(ctr);
+	retval = seq_open(file, &cgroup_tasks_seq_operations);
+	if (retval) {
+		release_cgroup_pid_array(cgrp);
+		return retval;
 	}
+	((struct seq_file *)file->private_data)->private = cgrp;
 	return 0;
 }
 
@@ -2210,7 +2275,6 @@ static struct cftype files[] = {
 	{
 		.name = "tasks",
 		.open = cgroup_tasks_open,
-		.read = cgroup_tasks_read,
 		.write_u64 = cgroup_tasks_write,
 		.release = cgroup_tasks_release,
 		.private = FILE_TASKLIST,
@@ -2300,10 +2364,7 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
 
 	mutex_lock(&cgroup_mutex);
 
-	INIT_LIST_HEAD(&cgrp->sibling);
-	INIT_LIST_HEAD(&cgrp->children);
-	INIT_LIST_HEAD(&cgrp->css_sets);
-	INIT_LIST_HEAD(&cgrp->release_list);
+	init_cgroup_housekeeping(cgrp);
 
 	cgrp->parent = parent;
 	cgrp->root = parent->root;
@@ -2418,10 +2479,7 @@ static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry)
 		mutex_unlock(&cgroup_mutex);
 		return -EBUSY;
 	}
-
-	parent = cgrp->parent;
-	root = cgrp->root;
-	sb = root->sb;
+	mutex_unlock(&cgroup_mutex);
 
 	/*
 	 * Call pre_destroy handlers of subsys. Notify subsystems
@@ -2429,7 +2487,14 @@ static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry)
 	 */
 	cgroup_call_pre_destroy(cgrp);
 
-	if (cgroup_has_css_refs(cgrp)) {
+	mutex_lock(&cgroup_mutex);
+	parent = cgrp->parent;
+	root = cgrp->root;
+	sb = root->sb;
+
+	if (atomic_read(&cgrp->count)
+	    || !list_empty(&cgrp->children)
+	    || cgroup_has_css_refs(cgrp)) {
 		mutex_unlock(&cgroup_mutex);
 		return -EBUSY;
 	}
@@ -2443,7 +2508,6 @@ static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry)
 	list_del(&cgrp->sibling);
 	spin_lock(&cgrp->dentry->d_lock);
 	d = dget(cgrp->dentry);
-	cgrp->dentry = NULL;
 	spin_unlock(&d->d_lock);
 
 	cgroup_d_remove_dir(d);
@@ -2495,8 +2559,7 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
 int __init cgroup_init_early(void)
 {
 	int i;
-	kref_init(&init_css_set.ref);
-	kref_get(&init_css_set.ref);
+	atomic_set(&init_css_set.refcount, 1);
 	INIT_LIST_HEAD(&init_css_set.cg_links);
 	INIT_LIST_HEAD(&init_css_set.tasks);
 	INIT_HLIST_NODE(&init_css_set.hlist);
@@ -2735,6 +2798,8 @@ void cgroup_fork_callbacks(struct task_struct *child)
  * Called on every change to mm->owner. mm_init_owner() does not
  * invoke this routine, since it assigns the mm->owner the first time
  * and does not change it.
+ *
+ * The callbacks are invoked with mmap_sem held in read mode.
  */
 void cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct *new)
 {
@@ -2750,7 +2815,7 @@ void cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct *new)
 			if (oldcgrp == newcgrp)
 				continue;
 			if (ss->mm_owner_changed)
-				ss->mm_owner_changed(ss, oldcgrp, newcgrp);
+				ss->mm_owner_changed(ss, oldcgrp, newcgrp, new);
 		}
 	}
 }
@@ -2873,9 +2938,6 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,
  again:
 	root = subsys->root;
 	if (root == &rootnode) {
-		printk(KERN_INFO
-		       "Not cloning cgroup for unused subsystem %s\n",
-		       subsys->name);
 		mutex_unlock(&cgroup_mutex);
 		return 0;
 	}
diff --git a/kernel/cgroup_debug.c b/kernel/cgroup_debug.c
index c3dc3aba4c02..daca6209202d 100644
--- a/kernel/cgroup_debug.c
+++ b/kernel/cgroup_debug.c
@@ -57,7 +57,7 @@ static u64 current_css_set_refcount_read(struct cgroup *cont,
 	u64 count;
 
 	rcu_read_lock();
-	count = atomic_read(&current->cgroups->ref.refcount);
+	count = atomic_read(&current->cgroups->refcount);
 	rcu_read_unlock();
 	return count;
 }
@@ -90,7 +90,7 @@ static struct cftype files[] =  {
 	{
 		.name = "releasable",
 		.read_u64 = releasable_read,
-	}
+	},
 };
 
 static int debug_populate(struct cgroup_subsys *ss, struct cgroup *cont)
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
new file mode 100644
index 000000000000..fb249e2bcada
--- /dev/null
+++ b/kernel/cgroup_freezer.c
@@ -0,0 +1,379 @@
+/*
+ * cgroup_freezer.c -  control group freezer subsystem
+ *
+ * Copyright IBM Corporation, 2007
+ *
+ * Author : Cedric Le Goater <clg@fr.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <linux/module.h>
+#include <linux/cgroup.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/freezer.h>
+#include <linux/seq_file.h>
+
+enum freezer_state {
+	CGROUP_THAWED = 0,
+	CGROUP_FREEZING,
+	CGROUP_FROZEN,
+};
+
+struct freezer {
+	struct cgroup_subsys_state css;
+	enum freezer_state state;
+	spinlock_t lock; /* protects _writes_ to state */
+};
+
+static inline struct freezer *cgroup_freezer(
+		struct cgroup *cgroup)
+{
+	return container_of(
+		cgroup_subsys_state(cgroup, freezer_subsys_id),
+		struct freezer, css);
+}
+
+static inline struct freezer *task_freezer(struct task_struct *task)
+{
+	return container_of(task_subsys_state(task, freezer_subsys_id),
+			    struct freezer, css);
+}
+
+int cgroup_frozen(struct task_struct *task)
+{
+	struct freezer *freezer;
+	enum freezer_state state;
+
+	task_lock(task);
+	freezer = task_freezer(task);
+	state = freezer->state;
+	task_unlock(task);
+
+	return state == CGROUP_FROZEN;
+}
+
+/*
+ * cgroups_write_string() limits the size of freezer state strings to
+ * CGROUP_LOCAL_BUFFER_SIZE
+ */
+static const char *freezer_state_strs[] = {
+	"THAWED",
+	"FREEZING",
+	"FROZEN",
+};
+
+/*
+ * State diagram
+ * Transitions are caused by userspace writes to the freezer.state file.
+ * The values in parenthesis are state labels. The rest are edge labels.
+ *
+ * (THAWED) --FROZEN--> (FREEZING) --FROZEN--> (FROZEN)
+ *    ^ ^                    |                     |
+ *    | \_______THAWED_______/                     |
+ *    \__________________________THAWED____________/
+ */
+
+struct cgroup_subsys freezer_subsys;
+
+/* Locks taken and their ordering
+ * ------------------------------
+ * css_set_lock
+ * cgroup_mutex (AKA cgroup_lock)
+ * task->alloc_lock (AKA task_lock)
+ * freezer->lock
+ * task->sighand->siglock
+ *
+ * cgroup code forces css_set_lock to be taken before task->alloc_lock
+ *
+ * freezer_create(), freezer_destroy():
+ * cgroup_mutex [ by cgroup core ]
+ *
+ * can_attach():
+ * cgroup_mutex
+ *
+ * cgroup_frozen():
+ * task->alloc_lock (to get task's cgroup)
+ *
+ * freezer_fork() (preserving fork() performance means can't take cgroup_mutex):
+ * task->alloc_lock (to get task's cgroup)
+ * freezer->lock
+ *  sighand->siglock (if the cgroup is freezing)
+ *
+ * freezer_read():
+ * cgroup_mutex
+ *  freezer->lock
+ *   read_lock css_set_lock (cgroup iterator start)
+ *
+ * freezer_write() (freeze):
+ * cgroup_mutex
+ *  freezer->lock
+ *   read_lock css_set_lock (cgroup iterator start)
+ *    sighand->siglock
+ *
+ * freezer_write() (unfreeze):
+ * cgroup_mutex
+ *  freezer->lock
+ *   read_lock css_set_lock (cgroup iterator start)
+ *    task->alloc_lock (to prevent races with freeze_task())
+ *     sighand->siglock
+ */
+static struct cgroup_subsys_state *freezer_create(struct cgroup_subsys *ss,
+						  struct cgroup *cgroup)
+{
+	struct freezer *freezer;
+
+	freezer = kzalloc(sizeof(struct freezer), GFP_KERNEL);
+	if (!freezer)
+		return ERR_PTR(-ENOMEM);
+
+	spin_lock_init(&freezer->lock);
+	freezer->state = CGROUP_THAWED;
+	return &freezer->css;
+}
+
+static void freezer_destroy(struct cgroup_subsys *ss,
+			    struct cgroup *cgroup)
+{
+	kfree(cgroup_freezer(cgroup));
+}
+
+/* Task is frozen or will freeze immediately when next it gets woken */
+static bool is_task_frozen_enough(struct task_struct *task)
+{
+	return frozen(task) ||
+		(task_is_stopped_or_traced(task) && freezing(task));
+}
+
+/*
+ * The call to cgroup_lock() in the freezer.state write method prevents
+ * a write to that file racing against an attach, and hence the
+ * can_attach() result will remain valid until the attach completes.
+ */
+static int freezer_can_attach(struct cgroup_subsys *ss,
+			      struct cgroup *new_cgroup,
+			      struct task_struct *task)
+{
+	struct freezer *freezer;
+
+	/*
+	 * Anything frozen can't move or be moved to/from.
+	 *
+	 * Since orig_freezer->state == FROZEN means that @task has been
+	 * frozen, so it's sufficient to check the latter condition.
+	 */
+
+	if (is_task_frozen_enough(task))
+		return -EBUSY;
+
+	freezer = cgroup_freezer(new_cgroup);
+	if (freezer->state == CGROUP_FROZEN)
+		return -EBUSY;
+
+	return 0;
+}
+
+static void freezer_fork(struct cgroup_subsys *ss, struct task_struct *task)
+{
+	struct freezer *freezer;
+
+	/*
+	 * No lock is needed, since the task isn't on tasklist yet,
+	 * so it can't be moved to another cgroup, which means the
+	 * freezer won't be removed and will be valid during this
+	 * function call.
+	 */
+	freezer = task_freezer(task);
+
+	/*
+	 * The root cgroup is non-freezable, so we can skip the
+	 * following check.
+	 */
+	if (!freezer->css.cgroup->parent)
+		return;
+
+	spin_lock_irq(&freezer->lock);
+	BUG_ON(freezer->state == CGROUP_FROZEN);
+
+	/* Locking avoids race with FREEZING -> THAWED transitions. */
+	if (freezer->state == CGROUP_FREEZING)
+		freeze_task(task, true);
+	spin_unlock_irq(&freezer->lock);
+}
+
+/*
+ * caller must hold freezer->lock
+ */
+static void update_freezer_state(struct cgroup *cgroup,
+				 struct freezer *freezer)
+{
+	struct cgroup_iter it;
+	struct task_struct *task;
+	unsigned int nfrozen = 0, ntotal = 0;
+
+	cgroup_iter_start(cgroup, &it);
+	while ((task = cgroup_iter_next(cgroup, &it))) {
+		ntotal++;
+		if (is_task_frozen_enough(task))
+			nfrozen++;
+	}
+
+	/*
+	 * Transition to FROZEN when no new tasks can be added ensures
+	 * that we never exist in the FROZEN state while there are unfrozen
+	 * tasks.
+	 */
+	if (nfrozen == ntotal)
+		freezer->state = CGROUP_FROZEN;
+	else if (nfrozen > 0)
+		freezer->state = CGROUP_FREEZING;
+	else
+		freezer->state = CGROUP_THAWED;
+	cgroup_iter_end(cgroup, &it);
+}
+
+static int freezer_read(struct cgroup *cgroup, struct cftype *cft,
+			struct seq_file *m)
+{
+	struct freezer *freezer;
+	enum freezer_state state;
+
+	if (!cgroup_lock_live_group(cgroup))
+		return -ENODEV;
+
+	freezer = cgroup_freezer(cgroup);
+	spin_lock_irq(&freezer->lock);
+	state = freezer->state;
+	if (state == CGROUP_FREEZING) {
+		/* We change from FREEZING to FROZEN lazily if the cgroup was
+		 * only partially frozen when we exitted write. */
+		update_freezer_state(cgroup, freezer);
+		state = freezer->state;
+	}
+	spin_unlock_irq(&freezer->lock);
+	cgroup_unlock();
+
+	seq_puts(m, freezer_state_strs[state]);
+	seq_putc(m, '\n');
+	return 0;
+}
+
+static int try_to_freeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
+{
+	struct cgroup_iter it;
+	struct task_struct *task;
+	unsigned int num_cant_freeze_now = 0;
+
+	freezer->state = CGROUP_FREEZING;
+	cgroup_iter_start(cgroup, &it);
+	while ((task = cgroup_iter_next(cgroup, &it))) {
+		if (!freeze_task(task, true))
+			continue;
+		if (is_task_frozen_enough(task))
+			continue;
+		if (!freezing(task) && !freezer_should_skip(task))
+			num_cant_freeze_now++;
+	}
+	cgroup_iter_end(cgroup, &it);
+
+	return num_cant_freeze_now ? -EBUSY : 0;
+}
+
+static void unfreeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
+{
+	struct cgroup_iter it;
+	struct task_struct *task;
+
+	cgroup_iter_start(cgroup, &it);
+	while ((task = cgroup_iter_next(cgroup, &it))) {
+		thaw_process(task);
+	}
+	cgroup_iter_end(cgroup, &it);
+
+	freezer->state = CGROUP_THAWED;
+}
+
+static int freezer_change_state(struct cgroup *cgroup,
+				enum freezer_state goal_state)
+{
+	struct freezer *freezer;
+	int retval = 0;
+
+	freezer = cgroup_freezer(cgroup);
+
+	spin_lock_irq(&freezer->lock);
+
+	update_freezer_state(cgroup, freezer);
+	if (goal_state == freezer->state)
+		goto out;
+
+	switch (goal_state) {
+	case CGROUP_THAWED:
+		unfreeze_cgroup(cgroup, freezer);
+		break;
+	case CGROUP_FROZEN:
+		retval = try_to_freeze_cgroup(cgroup, freezer);
+		break;
+	default:
+		BUG();
+	}
+out:
+	spin_unlock_irq(&freezer->lock);
+
+	return retval;
+}
+
+static int freezer_write(struct cgroup *cgroup,
+			 struct cftype *cft,
+			 const char *buffer)
+{
+	int retval;
+	enum freezer_state goal_state;
+
+	if (strcmp(buffer, freezer_state_strs[CGROUP_THAWED]) == 0)
+		goal_state = CGROUP_THAWED;
+	else if (strcmp(buffer, freezer_state_strs[CGROUP_FROZEN]) == 0)
+		goal_state = CGROUP_FROZEN;
+	else
+		return -EINVAL;
+
+	if (!cgroup_lock_live_group(cgroup))
+		return -ENODEV;
+	retval = freezer_change_state(cgroup, goal_state);
+	cgroup_unlock();
+	return retval;
+}
+
+static struct cftype files[] = {
+	{
+		.name = "state",
+		.read_seq_string = freezer_read,
+		.write_string = freezer_write,
+	},
+};
+
+static int freezer_populate(struct cgroup_subsys *ss, struct cgroup *cgroup)
+{
+	if (!cgroup->parent)
+		return 0;
+	return cgroup_add_files(cgroup, ss, files, ARRAY_SIZE(files));
+}
+
+struct cgroup_subsys freezer_subsys = {
+	.name		= "freezer",
+	.create		= freezer_create,
+	.destroy	= freezer_destroy,
+	.populate	= freezer_populate,
+	.subsys_id	= freezer_subsys_id,
+	.can_attach	= freezer_can_attach,
+	.attach		= NULL,
+	.fork		= freezer_fork,
+	.exit		= NULL,
+};
diff --git a/kernel/compat.c b/kernel/compat.c
index 32c254a8ab9a..8eafe3eb50d9 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -23,9 +23,68 @@
 #include <linux/timex.h>
 #include <linux/migrate.h>
 #include <linux/posix-timers.h>
+#include <linux/times.h>
 
 #include <asm/uaccess.h>
 
+/*
+ * Note that the native side is already converted to a timespec, because
+ * that's what we want anyway.
+ */
+static int compat_get_timeval(struct timespec *o,
+		struct compat_timeval __user *i)
+{
+	long usec;
+
+	if (get_user(o->tv_sec, &i->tv_sec) ||
+	    get_user(usec, &i->tv_usec))
+		return -EFAULT;
+	o->tv_nsec = usec * 1000;
+	return 0;
+}
+
+static int compat_put_timeval(struct compat_timeval __user *o,
+		struct timeval *i)
+{
+	return (put_user(i->tv_sec, &o->tv_sec) ||
+		put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
+}
+
+asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
+		struct timezone __user *tz)
+{
+	if (tv) {
+		struct timeval ktv;
+		do_gettimeofday(&ktv);
+		if (compat_put_timeval(tv, &ktv))
+			return -EFAULT;
+	}
+	if (tz) {
+		if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
+asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
+		struct timezone __user *tz)
+{
+	struct timespec kts;
+	struct timezone ktz;
+
+	if (tv) {
+		if (compat_get_timeval(&kts, tv))
+			return -EFAULT;
+	}
+	if (tz) {
+		if (copy_from_user(&ktz, tz, sizeof(ktz)))
+			return -EFAULT;
+	}
+
+	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
+}
+
 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
 {
 	return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
@@ -150,49 +209,23 @@ asmlinkage long compat_sys_setitimer(int which,
 	return 0;
 }
 
+static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
+{
+	return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
+}
+
 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
 {
-	/*
-	 *	In the SMP world we might just be unlucky and have one of
-	 *	the times increment as we use it. Since the value is an
-	 *	atomically safe type this is just fine. Conceptually its
-	 *	as if the syscall took an instant longer to occur.
-	 */
 	if (tbuf) {
+		struct tms tms;
 		struct compat_tms tmp;
-		struct task_struct *tsk = current;
-		struct task_struct *t;
-		cputime_t utime, stime, cutime, cstime;
-
-		read_lock(&tasklist_lock);
-		utime = tsk->signal->utime;
-		stime = tsk->signal->stime;
-		t = tsk;
-		do {
-			utime = cputime_add(utime, t->utime);
-			stime = cputime_add(stime, t->stime);
-			t = next_thread(t);
-		} while (t != tsk);
-
-		/*
-		 * While we have tasklist_lock read-locked, no dying thread
-		 * can be updating current->signal->[us]time.  Instead,
-		 * we got their counts included in the live thread loop.
-		 * However, another thread can come in right now and
-		 * do a wait call that updates current->signal->c[us]time.
-		 * To make sure we always see that pair updated atomically,
-		 * we take the siglock around fetching them.
-		 */
-		spin_lock_irq(&tsk->sighand->siglock);
-		cutime = tsk->signal->cutime;
-		cstime = tsk->signal->cstime;
-		spin_unlock_irq(&tsk->sighand->siglock);
-		read_unlock(&tasklist_lock);
-
-		tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
-		tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
-		tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
-		tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
+
+		do_sys_times(&tms);
+		/* Convert our struct tms to the compat version. */
+		tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
+		tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
+		tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
+		tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
 		if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
 			return -EFAULT;
 	}
diff --git a/kernel/configs.c b/kernel/configs.c
index 4c345210ed8c..abaee684ecbf 100644
--- a/kernel/configs.c
+++ b/kernel/configs.c
@@ -54,9 +54,6 @@
 
 #ifdef CONFIG_IKCONFIG_PROC
 
-/**************************************************/
-/* globals and useful constants                   */
-
 static ssize_t
 ikconfig_read_current(struct file *file, char __user *buf,
 		      size_t len, loff_t * offset)
@@ -71,9 +68,6 @@ static const struct file_operations ikconfig_file_ops = {
 	.read = ikconfig_read_current,
 };
 
-/***************************************************/
-/* ikconfig_init: start up everything we need to */
-
 static int __init ikconfig_init(void)
 {
 	struct proc_dir_entry *entry;
@@ -89,9 +83,6 @@ static int __init ikconfig_init(void)
 	return 0;
 }
 
-/***************************************************/
-/* ikconfig_cleanup: clean up our mess           */
-
 static void __exit ikconfig_cleanup(void)
 {
 	remove_proc_entry("config.gz", NULL);
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 86d49045daed..8ea32e8d68b0 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -462,7 +462,7 @@ out:
  * It must be called by the arch code on the new cpu, before the new cpu
  * enables interrupts and before the "boot" cpu returns from __cpu_up().
  */
-void notify_cpu_starting(unsigned int cpu)
+void __cpuinit notify_cpu_starting(unsigned int cpu)
 {
 	unsigned long val = CPU_STARTING;
 
@@ -499,3 +499,6 @@ const unsigned long cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)] = {
 #endif
 };
 EXPORT_SYMBOL_GPL(cpu_bit_bitmap);
+
+const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL;
+EXPORT_SYMBOL(cpu_all_bits);
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index eab7bd6628e0..96c0ba13b8cd 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -36,6 +36,7 @@
 #include <linux/list.h>
 #include <linux/mempolicy.h>
 #include <linux/mm.h>
+#include <linux/memory.h>
 #include <linux/module.h>
 #include <linux/mount.h>
 #include <linux/namei.h>
@@ -584,10 +585,9 @@ static int generate_sched_domains(cpumask_t **domains,
 	int i, j, k;		/* indices for partition finding loops */
 	cpumask_t *doms;	/* resulting partition; i.e. sched domains */
 	struct sched_domain_attr *dattr;  /* attributes for custom domains */
-	int ndoms;		/* number of sched domains in result */
+	int ndoms = 0;		/* number of sched domains in result */
 	int nslot;		/* next empty doms[] cpumask_t slot */
 
-	ndoms = 0;
 	doms = NULL;
 	dattr = NULL;
 	csa = NULL;
@@ -674,10 +674,8 @@ restart:
 	 * Convert <csn, csa> to <ndoms, doms> and populate cpu masks.
 	 */
 	doms = kmalloc(ndoms * sizeof(cpumask_t), GFP_KERNEL);
-	if (!doms) {
-		ndoms = 0;
+	if (!doms)
 		goto done;
-	}
 
 	/*
 	 * The rest of the code, including the scheduler, can deal with
@@ -732,6 +730,13 @@ restart:
 done:
 	kfree(csa);
 
+	/*
+	 * Fallback to the default domain if kmalloc() failed.
+	 * See comments in partition_sched_domains().
+	 */
+	if (doms == NULL)
+		ndoms = 1;
+
 	*domains    = doms;
 	*attributes = dattr;
 	return ndoms;
@@ -1172,7 +1177,7 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
 {
 	struct cpuset trialcs;
 	int err;
-	int cpus_nonempty, balance_flag_changed;
+	int balance_flag_changed;
 
 	trialcs = *cs;
 	if (turning_on)
@@ -1184,7 +1189,6 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
 	if (err < 0)
 		return err;
 
-	cpus_nonempty = !cpus_empty(trialcs.cpus_allowed);
 	balance_flag_changed = (is_sched_load_balance(cs) !=
 		 			is_sched_load_balance(&trialcs));
 
@@ -1192,7 +1196,7 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
 	cs->flags = trialcs.flags;
 	mutex_unlock(&callback_mutex);
 
-	if (cpus_nonempty && balance_flag_changed)
+	if (!cpus_empty(trialcs.cpus_allowed) && balance_flag_changed)
 		async_rebuild_sched_domains();
 
 	return 0;
@@ -2012,12 +2016,23 @@ static int cpuset_track_online_cpus(struct notifier_block *unused_nb,
  * Call this routine anytime after node_states[N_HIGH_MEMORY] changes.
  * See also the previous routine cpuset_track_online_cpus().
  */
-void cpuset_track_online_nodes(void)
+static int cpuset_track_online_nodes(struct notifier_block *self,
+				unsigned long action, void *arg)
 {
 	cgroup_lock();
-	top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
-	scan_for_empty_cpusets(&top_cpuset);
+	switch (action) {
+	case MEM_ONLINE:
+		top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
+		break;
+	case MEM_OFFLINE:
+		top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
+		scan_for_empty_cpusets(&top_cpuset);
+		break;
+	default:
+		break;
+	}
 	cgroup_unlock();
+	return NOTIFY_OK;
 }
 #endif
 
@@ -2033,6 +2048,7 @@ void __init cpuset_init_smp(void)
 	top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
 
 	hotcpu_notifier(cpuset_track_online_cpus, 0);
+	hotplug_memory_notifier(cpuset_track_online_nodes, 10);
 }
 
 /**
@@ -2437,19 +2453,15 @@ const struct file_operations proc_cpuset_operations = {
 void cpuset_task_status_allowed(struct seq_file *m, struct task_struct *task)
 {
 	seq_printf(m, "Cpus_allowed:\t");
-	m->count += cpumask_scnprintf(m->buf + m->count, m->size - m->count,
-					task->cpus_allowed);
+	seq_cpumask(m, &task->cpus_allowed);
 	seq_printf(m, "\n");
 	seq_printf(m, "Cpus_allowed_list:\t");
-	m->count += cpulist_scnprintf(m->buf + m->count, m->size - m->count,
-					task->cpus_allowed);
+	seq_cpumask_list(m, &task->cpus_allowed);
 	seq_printf(m, "\n");
 	seq_printf(m, "Mems_allowed:\t");
-	m->count += nodemask_scnprintf(m->buf + m->count, m->size - m->count,
-					task->mems_allowed);
+	seq_nodemask(m, &task->mems_allowed);
 	seq_printf(m, "\n");
 	seq_printf(m, "Mems_allowed_list:\t");
-	m->count += nodelist_scnprintf(m->buf + m->count, m->size - m->count,
-					task->mems_allowed);
+	seq_nodemask_list(m, &task->mems_allowed);
 	seq_printf(m, "\n");
 }
diff --git a/kernel/cred-internals.h b/kernel/cred-internals.h
new file mode 100644
index 000000000000..2dc4fc2d0bf1
--- /dev/null
+++ b/kernel/cred-internals.h
@@ -0,0 +1,21 @@
+/* Internal credentials stuff
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+/*
+ * user.c
+ */
+static inline void sched_switch_user(struct task_struct *p)
+{
+#ifdef CONFIG_USER_SCHED
+	sched_move_task(p);
+#endif	/* CONFIG_USER_SCHED */
+}
+
diff --git a/kernel/cred.c b/kernel/cred.c
new file mode 100644
index 000000000000..ff7bc071991c
--- /dev/null
+++ b/kernel/cred.c
@@ -0,0 +1,588 @@
+/* Task credentials management - see Documentation/credentials.txt
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/module.h>
+#include <linux/cred.h>
+#include <linux/sched.h>
+#include <linux/key.h>
+#include <linux/keyctl.h>
+#include <linux/init_task.h>
+#include <linux/security.h>
+#include <linux/cn_proc.h>
+#include "cred-internals.h"
+
+static struct kmem_cache *cred_jar;
+
+/*
+ * The common credentials for the initial task's thread group
+ */
+#ifdef CONFIG_KEYS
+static struct thread_group_cred init_tgcred = {
+	.usage	= ATOMIC_INIT(2),
+	.tgid	= 0,
+	.lock	= SPIN_LOCK_UNLOCKED,
+};
+#endif
+
+/*
+ * The initial credentials for the initial task
+ */
+struct cred init_cred = {
+	.usage			= ATOMIC_INIT(4),
+	.securebits		= SECUREBITS_DEFAULT,
+	.cap_inheritable	= CAP_INIT_INH_SET,
+	.cap_permitted		= CAP_FULL_SET,
+	.cap_effective		= CAP_INIT_EFF_SET,
+	.cap_bset		= CAP_INIT_BSET,
+	.user			= INIT_USER,
+	.group_info		= &init_groups,
+#ifdef CONFIG_KEYS
+	.tgcred			= &init_tgcred,
+#endif
+};
+
+/*
+ * Dispose of the shared task group credentials
+ */
+#ifdef CONFIG_KEYS
+static void release_tgcred_rcu(struct rcu_head *rcu)
+{
+	struct thread_group_cred *tgcred =
+		container_of(rcu, struct thread_group_cred, rcu);
+
+	BUG_ON(atomic_read(&tgcred->usage) != 0);
+
+	key_put(tgcred->session_keyring);
+	key_put(tgcred->process_keyring);
+	kfree(tgcred);
+}
+#endif
+
+/*
+ * Release a set of thread group credentials.
+ */
+static void release_tgcred(struct cred *cred)
+{
+#ifdef CONFIG_KEYS
+	struct thread_group_cred *tgcred = cred->tgcred;
+
+	if (atomic_dec_and_test(&tgcred->usage))
+		call_rcu(&tgcred->rcu, release_tgcred_rcu);
+#endif
+}
+
+/*
+ * The RCU callback to actually dispose of a set of credentials
+ */
+static void put_cred_rcu(struct rcu_head *rcu)
+{
+	struct cred *cred = container_of(rcu, struct cred, rcu);
+
+	if (atomic_read(&cred->usage) != 0)
+		panic("CRED: put_cred_rcu() sees %p with usage %d\n",
+		      cred, atomic_read(&cred->usage));
+
+	security_cred_free(cred);
+	key_put(cred->thread_keyring);
+	key_put(cred->request_key_auth);
+	release_tgcred(cred);
+	put_group_info(cred->group_info);
+	free_uid(cred->user);
+	kmem_cache_free(cred_jar, cred);
+}
+
+/**
+ * __put_cred - Destroy a set of credentials
+ * @cred: The record to release
+ *
+ * Destroy a set of credentials on which no references remain.
+ */
+void __put_cred(struct cred *cred)
+{
+	BUG_ON(atomic_read(&cred->usage) != 0);
+
+	call_rcu(&cred->rcu, put_cred_rcu);
+}
+EXPORT_SYMBOL(__put_cred);
+
+/**
+ * prepare_creds - Prepare a new set of credentials for modification
+ *
+ * Prepare a new set of task credentials for modification.  A task's creds
+ * shouldn't generally be modified directly, therefore this function is used to
+ * prepare a new copy, which the caller then modifies and then commits by
+ * calling commit_creds().
+ *
+ * Preparation involves making a copy of the objective creds for modification.
+ *
+ * Returns a pointer to the new creds-to-be if successful, NULL otherwise.
+ *
+ * Call commit_creds() or abort_creds() to clean up.
+ */
+struct cred *prepare_creds(void)
+{
+	struct task_struct *task = current;
+	const struct cred *old;
+	struct cred *new;
+
+	BUG_ON(atomic_read(&task->real_cred->usage) < 1);
+
+	new = kmem_cache_alloc(cred_jar, GFP_KERNEL);
+	if (!new)
+		return NULL;
+
+	old = task->cred;
+	memcpy(new, old, sizeof(struct cred));
+
+	atomic_set(&new->usage, 1);
+	get_group_info(new->group_info);
+	get_uid(new->user);
+
+#ifdef CONFIG_KEYS
+	key_get(new->thread_keyring);
+	key_get(new->request_key_auth);
+	atomic_inc(&new->tgcred->usage);
+#endif
+
+#ifdef CONFIG_SECURITY
+	new->security = NULL;
+#endif
+
+	if (security_prepare_creds(new, old, GFP_KERNEL) < 0)
+		goto error;
+	return new;
+
+error:
+	abort_creds(new);
+	return NULL;
+}
+EXPORT_SYMBOL(prepare_creds);
+
+/*
+ * Prepare credentials for current to perform an execve()
+ * - The caller must hold current->cred_exec_mutex
+ */
+struct cred *prepare_exec_creds(void)
+{
+	struct thread_group_cred *tgcred = NULL;
+	struct cred *new;
+
+#ifdef CONFIG_KEYS
+	tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL);
+	if (!tgcred)
+		return NULL;
+#endif
+
+	new = prepare_creds();
+	if (!new) {
+		kfree(tgcred);
+		return new;
+	}
+
+#ifdef CONFIG_KEYS
+	/* newly exec'd tasks don't get a thread keyring */
+	key_put(new->thread_keyring);
+	new->thread_keyring = NULL;
+
+	/* create a new per-thread-group creds for all this set of threads to
+	 * share */
+	memcpy(tgcred, new->tgcred, sizeof(struct thread_group_cred));
+
+	atomic_set(&tgcred->usage, 1);
+	spin_lock_init(&tgcred->lock);
+
+	/* inherit the session keyring; new process keyring */
+	key_get(tgcred->session_keyring);
+	tgcred->process_keyring = NULL;
+
+	release_tgcred(new);
+	new->tgcred = tgcred;
+#endif
+
+	return new;
+}
+
+/*
+ * prepare new credentials for the usermode helper dispatcher
+ */
+struct cred *prepare_usermodehelper_creds(void)
+{
+#ifdef CONFIG_KEYS
+	struct thread_group_cred *tgcred = NULL;
+#endif
+	struct cred *new;
+
+#ifdef CONFIG_KEYS
+	tgcred = kzalloc(sizeof(*new->tgcred), GFP_ATOMIC);
+	if (!tgcred)
+		return NULL;
+#endif
+
+	new = kmem_cache_alloc(cred_jar, GFP_ATOMIC);
+	if (!new)
+		return NULL;
+
+	memcpy(new, &init_cred, sizeof(struct cred));
+
+	atomic_set(&new->usage, 1);
+	get_group_info(new->group_info);
+	get_uid(new->user);
+
+#ifdef CONFIG_KEYS
+	new->thread_keyring = NULL;
+	new->request_key_auth = NULL;
+	new->jit_keyring = KEY_REQKEY_DEFL_DEFAULT;
+
+	atomic_set(&tgcred->usage, 1);
+	spin_lock_init(&tgcred->lock);
+	new->tgcred = tgcred;
+#endif
+
+#ifdef CONFIG_SECURITY
+	new->security = NULL;
+#endif
+	if (security_prepare_creds(new, &init_cred, GFP_ATOMIC) < 0)
+		goto error;
+
+	BUG_ON(atomic_read(&new->usage) != 1);
+	return new;
+
+error:
+	put_cred(new);
+	return NULL;
+}
+
+/*
+ * Copy credentials for the new process created by fork()
+ *
+ * We share if we can, but under some circumstances we have to generate a new
+ * set.
+ *
+ * The new process gets the current process's subjective credentials as its
+ * objective and subjective credentials
+ */
+int copy_creds(struct task_struct *p, unsigned long clone_flags)
+{
+#ifdef CONFIG_KEYS
+	struct thread_group_cred *tgcred;
+#endif
+	struct cred *new;
+	int ret;
+
+	mutex_init(&p->cred_exec_mutex);
+
+	if (
+#ifdef CONFIG_KEYS
+		!p->cred->thread_keyring &&
+#endif
+		clone_flags & CLONE_THREAD
+	    ) {
+		p->real_cred = get_cred(p->cred);
+		get_cred(p->cred);
+		atomic_inc(&p->cred->user->processes);
+		return 0;
+	}
+
+	new = prepare_creds();
+	if (!new)
+		return -ENOMEM;
+
+	if (clone_flags & CLONE_NEWUSER) {
+		ret = create_user_ns(new);
+		if (ret < 0)
+			goto error_put;
+	}
+
+#ifdef CONFIG_KEYS
+	/* new threads get their own thread keyrings if their parent already
+	 * had one */
+	if (new->thread_keyring) {
+		key_put(new->thread_keyring);
+		new->thread_keyring = NULL;
+		if (clone_flags & CLONE_THREAD)
+			install_thread_keyring_to_cred(new);
+	}
+
+	/* we share the process and session keyrings between all the threads in
+	 * a process - this is slightly icky as we violate COW credentials a
+	 * bit */
+	if (!(clone_flags & CLONE_THREAD)) {
+		tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL);
+		if (!tgcred) {
+			ret = -ENOMEM;
+			goto error_put;
+		}
+		atomic_set(&tgcred->usage, 1);
+		spin_lock_init(&tgcred->lock);
+		tgcred->process_keyring = NULL;
+		tgcred->session_keyring = key_get(new->tgcred->session_keyring);
+
+		release_tgcred(new);
+		new->tgcred = tgcred;
+	}
+#endif
+
+	atomic_inc(&new->user->processes);
+	p->cred = p->real_cred = get_cred(new);
+	return 0;
+
+error_put:
+	put_cred(new);
+	return ret;
+}
+
+/**
+ * commit_creds - Install new credentials upon the current task
+ * @new: The credentials to be assigned
+ *
+ * Install a new set of credentials to the current task, using RCU to replace
+ * the old set.  Both the objective and the subjective credentials pointers are
+ * updated.  This function may not be called if the subjective credentials are
+ * in an overridden state.
+ *
+ * This function eats the caller's reference to the new credentials.
+ *
+ * Always returns 0 thus allowing this function to be tail-called at the end
+ * of, say, sys_setgid().
+ */
+int commit_creds(struct cred *new)
+{
+	struct task_struct *task = current;
+	const struct cred *old;
+
+	BUG_ON(task->cred != task->real_cred);
+	BUG_ON(atomic_read(&task->real_cred->usage) < 2);
+	BUG_ON(atomic_read(&new->usage) < 1);
+
+	old = task->real_cred;
+	security_commit_creds(new, old);
+
+	get_cred(new); /* we will require a ref for the subj creds too */
+
+	/* dumpability changes */
+	if (old->euid != new->euid ||
+	    old->egid != new->egid ||
+	    old->fsuid != new->fsuid ||
+	    old->fsgid != new->fsgid ||
+	    !cap_issubset(new->cap_permitted, old->cap_permitted)) {
+		set_dumpable(task->mm, suid_dumpable);
+		task->pdeath_signal = 0;
+		smp_wmb();
+	}
+
+	/* alter the thread keyring */
+	if (new->fsuid != old->fsuid)
+		key_fsuid_changed(task);
+	if (new->fsgid != old->fsgid)
+		key_fsgid_changed(task);
+
+	/* do it
+	 * - What if a process setreuid()'s and this brings the
+	 *   new uid over his NPROC rlimit?  We can check this now
+	 *   cheaply with the new uid cache, so if it matters
+	 *   we should be checking for it.  -DaveM
+	 */
+	if (new->user != old->user)
+		atomic_inc(&new->user->processes);
+	rcu_assign_pointer(task->real_cred, new);
+	rcu_assign_pointer(task->cred, new);
+	if (new->user != old->user)
+		atomic_dec(&old->user->processes);
+
+	sched_switch_user(task);
+
+	/* send notifications */
+	if (new->uid   != old->uid  ||
+	    new->euid  != old->euid ||
+	    new->suid  != old->suid ||
+	    new->fsuid != old->fsuid)
+		proc_id_connector(task, PROC_EVENT_UID);
+
+	if (new->gid   != old->gid  ||
+	    new->egid  != old->egid ||
+	    new->sgid  != old->sgid ||
+	    new->fsgid != old->fsgid)
+		proc_id_connector(task, PROC_EVENT_GID);
+
+	/* release the old obj and subj refs both */
+	put_cred(old);
+	put_cred(old);
+	return 0;
+}
+EXPORT_SYMBOL(commit_creds);
+
+/**
+ * abort_creds - Discard a set of credentials and unlock the current task
+ * @new: The credentials that were going to be applied
+ *
+ * Discard a set of credentials that were under construction and unlock the
+ * current task.
+ */
+void abort_creds(struct cred *new)
+{
+	BUG_ON(atomic_read(&new->usage) < 1);
+	put_cred(new);
+}
+EXPORT_SYMBOL(abort_creds);
+
+/**
+ * override_creds - Override the current process's subjective credentials
+ * @new: The credentials to be assigned
+ *
+ * Install a set of temporary override subjective credentials on the current
+ * process, returning the old set for later reversion.
+ */
+const struct cred *override_creds(const struct cred *new)
+{
+	const struct cred *old = current->cred;
+
+	rcu_assign_pointer(current->cred, get_cred(new));
+	return old;
+}
+EXPORT_SYMBOL(override_creds);
+
+/**
+ * revert_creds - Revert a temporary subjective credentials override
+ * @old: The credentials to be restored
+ *
+ * Revert a temporary set of override subjective credentials to an old set,
+ * discarding the override set.
+ */
+void revert_creds(const struct cred *old)
+{
+	const struct cred *override = current->cred;
+
+	rcu_assign_pointer(current->cred, old);
+	put_cred(override);
+}
+EXPORT_SYMBOL(revert_creds);
+
+/*
+ * initialise the credentials stuff
+ */
+void __init cred_init(void)
+{
+	/* allocate a slab in which we can store credentials */
+	cred_jar = kmem_cache_create("cred_jar", sizeof(struct cred),
+				     0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+}
+
+/**
+ * prepare_kernel_cred - Prepare a set of credentials for a kernel service
+ * @daemon: A userspace daemon to be used as a reference
+ *
+ * Prepare a set of credentials for a kernel service.  This can then be used to
+ * override a task's own credentials so that work can be done on behalf of that
+ * task that requires a different subjective context.
+ *
+ * @daemon is used to provide a base for the security record, but can be NULL.
+ * If @daemon is supplied, then the security data will be derived from that;
+ * otherwise they'll be set to 0 and no groups, full capabilities and no keys.
+ *
+ * The caller may change these controls afterwards if desired.
+ *
+ * Returns the new credentials or NULL if out of memory.
+ *
+ * Does not take, and does not return holding current->cred_replace_mutex.
+ */
+struct cred *prepare_kernel_cred(struct task_struct *daemon)
+{
+	const struct cred *old;
+	struct cred *new;
+
+	new = kmem_cache_alloc(cred_jar, GFP_KERNEL);
+	if (!new)
+		return NULL;
+
+	if (daemon)
+		old = get_task_cred(daemon);
+	else
+		old = get_cred(&init_cred);
+
+	get_uid(new->user);
+	get_group_info(new->group_info);
+
+#ifdef CONFIG_KEYS
+	atomic_inc(&init_tgcred.usage);
+	new->tgcred = &init_tgcred;
+	new->request_key_auth = NULL;
+	new->thread_keyring = NULL;
+	new->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
+#endif
+
+#ifdef CONFIG_SECURITY
+	new->security = NULL;
+#endif
+	if (security_prepare_creds(new, old, GFP_KERNEL) < 0)
+		goto error;
+
+	atomic_set(&new->usage, 1);
+	put_cred(old);
+	return new;
+
+error:
+	put_cred(new);
+	return NULL;
+}
+EXPORT_SYMBOL(prepare_kernel_cred);
+
+/**
+ * set_security_override - Set the security ID in a set of credentials
+ * @new: The credentials to alter
+ * @secid: The LSM security ID to set
+ *
+ * Set the LSM security ID in a set of credentials so that the subjective
+ * security is overridden when an alternative set of credentials is used.
+ */
+int set_security_override(struct cred *new, u32 secid)
+{
+	return security_kernel_act_as(new, secid);
+}
+EXPORT_SYMBOL(set_security_override);
+
+/**
+ * set_security_override_from_ctx - Set the security ID in a set of credentials
+ * @new: The credentials to alter
+ * @secctx: The LSM security context to generate the security ID from.
+ *
+ * Set the LSM security ID in a set of credentials so that the subjective
+ * security is overridden when an alternative set of credentials is used.  The
+ * security ID is specified in string form as a security context to be
+ * interpreted by the LSM.
+ */
+int set_security_override_from_ctx(struct cred *new, const char *secctx)
+{
+	u32 secid;
+	int ret;
+
+	ret = security_secctx_to_secid(secctx, strlen(secctx), &secid);
+	if (ret < 0)
+		return ret;
+
+	return set_security_override(new, secid);
+}
+EXPORT_SYMBOL(set_security_override_from_ctx);
+
+/**
+ * set_create_files_as - Set the LSM file create context in a set of credentials
+ * @new: The credentials to alter
+ * @inode: The inode to take the context from
+ *
+ * Change the LSM file creation context in a set of credentials to be the same
+ * as the object context of the specified inode, so that the new inodes have
+ * the same MAC context as that inode.
+ */
+int set_create_files_as(struct cred *new, struct inode *inode)
+{
+	new->fsuid = inode->i_uid;
+	new->fsgid = inode->i_gid;
+	return security_kernel_create_files_as(new, inode);
+}
+EXPORT_SYMBOL(set_create_files_as);
diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index b3179dad71be..abb6e17505e2 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -127,7 +127,7 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
 	 */
 	t1 = tsk->sched_info.pcount;
 	t2 = tsk->sched_info.run_delay;
-	t3 = tsk->sched_info.cpu_time;
+	t3 = tsk->se.sum_exec_runtime;
 
 	d->cpu_count += t1;
 
diff --git a/kernel/dma.c b/kernel/dma.c
index d2c60a822790..f903189c5304 100644
--- a/kernel/dma.c
+++ b/kernel/dma.c
@@ -1,4 +1,4 @@
-/* $Id: dma.c,v 1.7 1994/12/28 03:35:33 root Exp root $
+/*
  * linux/kernel/dma.c: A DMA channel allocator. Inspired by linux/kernel/irq.c.
  *
  * Written by Hennus Bergman, 1992.
diff --git a/kernel/exec_domain.c b/kernel/exec_domain.c
index 0d407e886735..0511716e9424 100644
--- a/kernel/exec_domain.c
+++ b/kernel/exec_domain.c
@@ -12,7 +12,9 @@
 #include <linux/kmod.h>
 #include <linux/module.h>
 #include <linux/personality.h>
+#include <linux/proc_fs.h>
 #include <linux/sched.h>
+#include <linux/seq_file.h>
 #include <linux/syscalls.h>
 #include <linux/sysctl.h>
 #include <linux/types.h>
@@ -173,20 +175,39 @@ __set_personality(u_long personality)
 	return 0;
 }
 
-int
-get_exec_domain_list(char *page)
+#ifdef CONFIG_PROC_FS
+static int execdomains_proc_show(struct seq_file *m, void *v)
 {
 	struct exec_domain	*ep;
-	int			len = 0;
 
 	read_lock(&exec_domains_lock);
-	for (ep = exec_domains; ep && len < PAGE_SIZE - 80; ep = ep->next)
-		len += sprintf(page + len, "%d-%d\t%-16s\t[%s]\n",
+	for (ep = exec_domains; ep; ep = ep->next)
+		seq_printf(m, "%d-%d\t%-16s\t[%s]\n",
 			       ep->pers_low, ep->pers_high, ep->name,
 			       module_name(ep->module));
 	read_unlock(&exec_domains_lock);
-	return (len);
+	return 0;
+}
+
+static int execdomains_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, execdomains_proc_show, NULL);
+}
+
+static const struct file_operations execdomains_proc_fops = {
+	.open		= execdomains_proc_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static int __init proc_execdomains_init(void)
+{
+	proc_create("execdomains", 0, NULL, &execdomains_proc_fops);
+	return 0;
 }
+module_init(proc_execdomains_init);
+#endif
 
 asmlinkage long
 sys_personality(u_long personality)
diff --git a/kernel/exit.c b/kernel/exit.c
index c8d0485578be..e69edc74aeeb 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -40,18 +40,24 @@
 #include <linux/cn_proc.h>
 #include <linux/mutex.h>
 #include <linux/futex.h>
-#include <linux/compat.h>
 #include <linux/pipe_fs_i.h>
 #include <linux/audit.h> /* for audit_free() */
 #include <linux/resource.h>
 #include <linux/blkdev.h>
 #include <linux/task_io_accounting_ops.h>
 #include <linux/tracehook.h>
+#include <linux/init_task.h>
+#include <trace/sched.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
 #include <asm/pgtable.h>
 #include <asm/mmu_context.h>
+#include "cred-internals.h"
+
+DEFINE_TRACE(sched_process_free);
+DEFINE_TRACE(sched_process_exit);
+DEFINE_TRACE(sched_process_wait);
 
 static void exit_mm(struct task_struct * tsk);
 
@@ -112,8 +118,6 @@ static void __exit_signal(struct task_struct *tsk)
 		 * We won't ever get here for the group leader, since it
 		 * will have been the last reference on the signal_struct.
 		 */
-		sig->utime = cputime_add(sig->utime, task_utime(tsk));
-		sig->stime = cputime_add(sig->stime, task_stime(tsk));
 		sig->gtime = cputime_add(sig->gtime, task_gtime(tsk));
 		sig->min_flt += tsk->min_flt;
 		sig->maj_flt += tsk->maj_flt;
@@ -122,7 +126,6 @@ static void __exit_signal(struct task_struct *tsk)
 		sig->inblock += task_io_get_inblock(tsk);
 		sig->oublock += task_io_get_oublock(tsk);
 		task_io_accounting_add(&sig->ioac, &tsk->ioac);
-		sig->sum_sched_runtime += tsk->se.sum_exec_runtime;
 		sig = NULL; /* Marker for below. */
 	}
 
@@ -143,13 +146,21 @@ static void __exit_signal(struct task_struct *tsk)
 	if (sig) {
 		flush_sigqueue(&sig->shared_pending);
 		taskstats_tgid_free(sig);
+		/*
+		 * Make sure ->signal can't go away under rq->lock,
+		 * see account_group_exec_runtime().
+		 */
+		task_rq_unlock_wait(tsk);
 		__cleanup_signal(sig);
 	}
 }
 
 static void delayed_put_task_struct(struct rcu_head *rhp)
 {
-	put_task_struct(container_of(rhp, struct task_struct, rcu));
+	struct task_struct *tsk = container_of(rhp, struct task_struct, rcu);
+
+	trace_sched_process_free(tsk);
+	put_task_struct(tsk);
 }
 
 
@@ -159,7 +170,10 @@ void release_task(struct task_struct * p)
 	int zap_leader;
 repeat:
 	tracehook_prepare_release_task(p);
-	atomic_dec(&p->user->processes);
+	/* don't need to get the RCU readlock here - the process is dead and
+	 * can't be modifying its own credentials */
+	atomic_dec(&__task_cred(p)->user->processes);
+
 	proc_flush_task(p);
 	write_lock_irq(&tasklist_lock);
 	tracehook_finish_release_task(p);
@@ -334,12 +348,12 @@ static void reparent_to_kthreadd(void)
 	/* cpus_allowed? */
 	/* rt_priority? */
 	/* signals? */
-	security_task_reparent_to_init(current);
 	memcpy(current->signal->rlim, init_task.signal->rlim,
 	       sizeof(current->signal->rlim));
-	atomic_inc(&(INIT_USER->__count));
+
+	atomic_inc(&init_cred.usage);
+	commit_creds(&init_cred);
 	write_unlock_irq(&tasklist_lock);
-	switch_uid(INIT_USER);
 }
 
 void __set_special_pids(struct pid *pid)
@@ -640,24 +654,23 @@ retry:
 assign_new_owner:
 	BUG_ON(c == p);
 	get_task_struct(c);
+	read_unlock(&tasklist_lock);
+	down_write(&mm->mmap_sem);
 	/*
 	 * The task_lock protects c->mm from changing.
 	 * We always want mm->owner->mm == mm
 	 */
 	task_lock(c);
-	/*
-	 * Delay read_unlock() till we have the task_lock()
-	 * to ensure that c does not slip away underneath us
-	 */
-	read_unlock(&tasklist_lock);
 	if (c->mm != mm) {
 		task_unlock(c);
+		up_write(&mm->mmap_sem);
 		put_task_struct(c);
 		goto retry;
 	}
 	cgroup_mm_owner_callbacks(mm->owner, c);
 	mm->owner = c;
 	task_unlock(c);
+	up_write(&mm->mmap_sem);
 	put_task_struct(c);
 }
 #endif /* CONFIG_MM_OWNER */
@@ -1021,8 +1034,6 @@ NORET_TYPE void do_exit(long code)
 		 * task into the wait for ever nirwana as well.
 		 */
 		tsk->flags |= PF_EXITPIDONE;
-		if (tsk->io_context)
-			exit_io_context();
 		set_current_state(TASK_UNINTERRUPTIBLE);
 		schedule();
 	}
@@ -1051,14 +1062,6 @@ NORET_TYPE void do_exit(long code)
 		exit_itimers(tsk->signal);
 	}
 	acct_collect(code, group_dead);
-#ifdef CONFIG_FUTEX
-	if (unlikely(tsk->robust_list))
-		exit_robust_list(tsk);
-#ifdef CONFIG_COMPAT
-	if (unlikely(tsk->compat_robust_list))
-		compat_exit_robust_list(tsk);
-#endif
-#endif
 	if (group_dead)
 		tty_audit_exit();
 	if (unlikely(tsk->audit_context))
@@ -1071,13 +1074,14 @@ NORET_TYPE void do_exit(long code)
 
 	if (group_dead)
 		acct_process();
+	trace_sched_process_exit(tsk);
+
 	exit_sem(tsk);
 	exit_files(tsk);
 	exit_fs(tsk);
 	check_stack_usage();
 	exit_thread();
 	cgroup_exit(tsk, 1);
-	exit_keys(tsk);
 
 	if (group_dead && tsk->signal->leader)
 		disassociate_ctty(1);
@@ -1122,7 +1126,6 @@ NORET_TYPE void do_exit(long code)
 	preempt_disable();
 	/* causes final put_task_struct in finish_task_switch(). */
 	tsk->state = TASK_DEAD;
-
 	schedule();
 	BUG();
 	/* Avoid "noreturn function does return".  */
@@ -1262,12 +1265,12 @@ static int wait_task_zombie(struct task_struct *p, int options,
 	unsigned long state;
 	int retval, status, traced;
 	pid_t pid = task_pid_vnr(p);
+	uid_t uid = __task_cred(p)->uid;
 
 	if (!likely(options & WEXITED))
 		return 0;
 
 	if (unlikely(options & WNOWAIT)) {
-		uid_t uid = p->uid;
 		int exit_code = p->exit_code;
 		int why, status;
 
@@ -1299,6 +1302,7 @@ static int wait_task_zombie(struct task_struct *p, int options,
 	if (likely(!traced)) {
 		struct signal_struct *psig;
 		struct signal_struct *sig;
+		struct task_cputime cputime;
 
 		/*
 		 * The resource counters for the group leader are in its
@@ -1314,20 +1318,23 @@ static int wait_task_zombie(struct task_struct *p, int options,
 		 * need to protect the access to p->parent->signal fields,
 		 * as other threads in the parent group can be right
 		 * here reaping other children at the same time.
+		 *
+		 * We use thread_group_cputime() to get times for the thread
+		 * group, which consolidates times for all threads in the
+		 * group including the group leader.
 		 */
+		thread_group_cputime(p, &cputime);
 		spin_lock_irq(&p->parent->sighand->siglock);
 		psig = p->parent->signal;
 		sig = p->signal;
 		psig->cutime =
 			cputime_add(psig->cutime,
-			cputime_add(p->utime,
-			cputime_add(sig->utime,
-				    sig->cutime)));
+			cputime_add(cputime.utime,
+				    sig->cutime));
 		psig->cstime =
 			cputime_add(psig->cstime,
-			cputime_add(p->stime,
-			cputime_add(sig->stime,
-				    sig->cstime)));
+			cputime_add(cputime.stime,
+				    sig->cstime));
 		psig->cgtime =
 			cputime_add(psig->cgtime,
 			cputime_add(p->gtime,
@@ -1384,7 +1391,7 @@ static int wait_task_zombie(struct task_struct *p, int options,
 	if (!retval && infop)
 		retval = put_user(pid, &infop->si_pid);
 	if (!retval && infop)
-		retval = put_user(p->uid, &infop->si_uid);
+		retval = put_user(uid, &infop->si_uid);
 	if (!retval)
 		retval = pid;
 
@@ -1449,7 +1456,8 @@ static int wait_task_stopped(int ptrace, struct task_struct *p,
 	if (!unlikely(options & WNOWAIT))
 		p->exit_code = 0;
 
-	uid = p->uid;
+	/* don't need the RCU readlock here as we're holding a spinlock */
+	uid = __task_cred(p)->uid;
 unlock_sig:
 	spin_unlock_irq(&p->sighand->siglock);
 	if (!exit_code)
@@ -1523,10 +1531,10 @@ static int wait_task_continued(struct task_struct *p, int options,
 	}
 	if (!unlikely(options & WNOWAIT))
 		p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
+	uid = __task_cred(p)->uid;
 	spin_unlock_irq(&p->sighand->siglock);
 
 	pid = task_pid_vnr(p);
-	uid = p->uid;
 	get_task_struct(p);
 	read_unlock(&tasklist_lock);
 
@@ -1672,6 +1680,8 @@ static long do_wait(enum pid_type type, struct pid *pid, int options,
 	struct task_struct *tsk;
 	int retval;
 
+	trace_sched_process_wait(pid);
+
 	add_wait_queue(&current->signal->wait_chldexit,&wait);
 repeat:
 	/*
diff --git a/kernel/extable.c b/kernel/extable.c
index a26cb2e17023..e136ed8d82ba 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -17,6 +17,7 @@
 */
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/ftrace.h>
 #include <asm/uaccess.h>
 #include <asm/sections.h>
 
@@ -40,7 +41,7 @@ const struct exception_table_entry *search_exception_tables(unsigned long addr)
 	return e;
 }
 
-int core_kernel_text(unsigned long addr)
+__notrace_funcgraph int core_kernel_text(unsigned long addr)
 {
 	if (addr >= (unsigned long)_stext &&
 	    addr <= (unsigned long)_etext)
@@ -53,7 +54,7 @@ int core_kernel_text(unsigned long addr)
 	return 0;
 }
 
-int __kernel_text_address(unsigned long addr)
+__notrace_funcgraph int __kernel_text_address(unsigned long addr)
 {
 	if (core_kernel_text(addr))
 		return 1;
@@ -66,3 +67,19 @@ int kernel_text_address(unsigned long addr)
 		return 1;
 	return module_text_address(addr) != NULL;
 }
+
+/*
+ * On some architectures (PPC64, IA64) function pointers
+ * are actually only tokens to some data that then holds the
+ * real function address. As a result, to find if a function
+ * pointer is part of the kernel text, we need to do some
+ * special dereferencing first.
+ */
+int func_ptr_is_kernel_text(void *ptr)
+{
+	unsigned long addr;
+	addr = (unsigned long) dereference_function_descriptor(ptr);
+	if (core_kernel_text(addr))
+		return 1;
+	return module_text_address(addr) != NULL;
+}
diff --git a/kernel/fork.c b/kernel/fork.c
index 99c5c655b098..913284e3db14 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -40,12 +40,14 @@
 #include <linux/jiffies.h>
 #include <linux/tracehook.h>
 #include <linux/futex.h>
+#include <linux/compat.h>
 #include <linux/task_io_accounting_ops.h>
 #include <linux/rcupdate.h>
 #include <linux/ptrace.h>
 #include <linux/mount.h>
 #include <linux/audit.h>
 #include <linux/memcontrol.h>
+#include <linux/ftrace.h>
 #include <linux/profile.h>
 #include <linux/rmap.h>
 #include <linux/acct.h>
@@ -58,6 +60,7 @@
 #include <linux/tty.h>
 #include <linux/proc_fs.h>
 #include <linux/blkdev.h>
+#include <trace/sched.h>
 #include <linux/magic.h>
 
 #include <asm/pgtable.h>
@@ -79,6 +82,8 @@ DEFINE_PER_CPU(unsigned long, process_counts) = 0;
 
 __cacheline_aligned DEFINE_RWLOCK(tasklist_lock);  /* outer */
 
+DEFINE_TRACE(sched_process_fork);
+
 int nr_processes(void)
 {
 	int cpu;
@@ -136,6 +141,7 @@ void free_task(struct task_struct *tsk)
 	prop_local_destroy_single(&tsk->dirties);
 	free_thread_info(tsk->stack);
 	rt_mutex_debug_task_free(tsk);
+	ftrace_graph_exit_task(tsk);
 	free_task_struct(tsk);
 }
 EXPORT_SYMBOL(free_task);
@@ -146,9 +152,8 @@ void __put_task_struct(struct task_struct *tsk)
 	WARN_ON(atomic_read(&tsk->usage));
 	WARN_ON(tsk == current);
 
-	security_task_free(tsk);
-	free_uid(tsk->user);
-	put_group_info(tsk->group_info);
+	put_cred(tsk->real_cred);
+	put_cred(tsk->cred);
 	delayacct_tsk_free(tsk);
 
 	if (!profile_handoff_task(tsk))
@@ -318,17 +323,20 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
 		file = tmp->vm_file;
 		if (file) {
 			struct inode *inode = file->f_path.dentry->d_inode;
+			struct address_space *mapping = file->f_mapping;
+
 			get_file(file);
 			if (tmp->vm_flags & VM_DENYWRITE)
 				atomic_dec(&inode->i_writecount);
-
-			/* insert tmp into the share list, just after mpnt */
-			spin_lock(&file->f_mapping->i_mmap_lock);
+			spin_lock(&mapping->i_mmap_lock);
+			if (tmp->vm_flags & VM_SHARED)
+				mapping->i_mmap_writable++;
 			tmp->vm_truncate_count = mpnt->vm_truncate_count;
-			flush_dcache_mmap_lock(file->f_mapping);
+			flush_dcache_mmap_lock(mapping);
+			/* insert tmp into the share list, just after mpnt */
 			vma_prio_tree_add(tmp, mpnt);
-			flush_dcache_mmap_unlock(file->f_mapping);
-			spin_unlock(&file->f_mapping->i_mmap_lock);
+			flush_dcache_mmap_unlock(mapping);
+			spin_unlock(&mapping->i_mmap_lock);
 		}
 
 		/*
@@ -412,8 +420,8 @@ static struct mm_struct * mm_init(struct mm_struct * mm, struct task_struct *p)
 	set_mm_counter(mm, file_rss, 0);
 	set_mm_counter(mm, anon_rss, 0);
 	spin_lock_init(&mm->page_table_lock);
-	rwlock_init(&mm->ioctx_list_lock);
-	mm->ioctx_list = NULL;
+	spin_lock_init(&mm->ioctx_lock);
+	INIT_HLIST_HEAD(&mm->ioctx_list);
 	mm->free_area_cache = TASK_UNMAPPED_BASE;
 	mm->cached_hole_size = ~0UL;
 	mm_init_owner(mm, p);
@@ -523,6 +531,16 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
 {
 	struct completion *vfork_done = tsk->vfork_done;
 
+	/* Get rid of any futexes when releasing the mm */
+#ifdef CONFIG_FUTEX
+	if (unlikely(tsk->robust_list))
+		exit_robust_list(tsk);
+#ifdef CONFIG_COMPAT
+	if (unlikely(tsk->compat_robust_list))
+		compat_exit_robust_list(tsk);
+#endif
+#endif
+
 	/* Get rid of any cached register state */
 	deactivate_mm(tsk, mm);
 
@@ -764,27 +782,50 @@ void __cleanup_sighand(struct sighand_struct *sighand)
 		kmem_cache_free(sighand_cachep, sighand);
 }
 
+
+/*
+ * Initialize POSIX timer handling for a thread group.
+ */
+static void posix_cpu_timers_init_group(struct signal_struct *sig)
+{
+	/* Thread group counters. */
+	thread_group_cputime_init(sig);
+
+	/* Expiration times and increments. */
+	sig->it_virt_expires = cputime_zero;
+	sig->it_virt_incr = cputime_zero;
+	sig->it_prof_expires = cputime_zero;
+	sig->it_prof_incr = cputime_zero;
+
+	/* Cached expiration times. */
+	sig->cputime_expires.prof_exp = cputime_zero;
+	sig->cputime_expires.virt_exp = cputime_zero;
+	sig->cputime_expires.sched_exp = 0;
+
+	/* The timer lists. */
+	INIT_LIST_HEAD(&sig->cpu_timers[0]);
+	INIT_LIST_HEAD(&sig->cpu_timers[1]);
+	INIT_LIST_HEAD(&sig->cpu_timers[2]);
+}
+
 static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 {
 	struct signal_struct *sig;
 	int ret;
 
 	if (clone_flags & CLONE_THREAD) {
-		atomic_inc(&current->signal->count);
-		atomic_inc(&current->signal->live);
-		return 0;
+		ret = thread_group_cputime_clone_thread(current);
+		if (likely(!ret)) {
+			atomic_inc(&current->signal->count);
+			atomic_inc(&current->signal->live);
+		}
+		return ret;
 	}
 	sig = kmem_cache_alloc(signal_cachep, GFP_KERNEL);
 	tsk->signal = sig;
 	if (!sig)
 		return -ENOMEM;
 
-	ret = copy_thread_group_keys(tsk);
-	if (ret < 0) {
-		kmem_cache_free(signal_cachep, sig);
-		return ret;
-	}
-
 	atomic_set(&sig->count, 1);
 	atomic_set(&sig->live, 1);
 	init_waitqueue_head(&sig->wait_chldexit);
@@ -800,40 +841,25 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 	sig->it_real_incr.tv64 = 0;
 	sig->real_timer.function = it_real_fn;
 
-	sig->it_virt_expires = cputime_zero;
-	sig->it_virt_incr = cputime_zero;
-	sig->it_prof_expires = cputime_zero;
-	sig->it_prof_incr = cputime_zero;
-
 	sig->leader = 0;	/* session leadership doesn't inherit */
 	sig->tty_old_pgrp = NULL;
 	sig->tty = NULL;
 
-	sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
+	sig->cutime = sig->cstime = cputime_zero;
 	sig->gtime = cputime_zero;
 	sig->cgtime = cputime_zero;
 	sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
 	sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
 	sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0;
 	task_io_accounting_init(&sig->ioac);
-	sig->sum_sched_runtime = 0;
-	INIT_LIST_HEAD(&sig->cpu_timers[0]);
-	INIT_LIST_HEAD(&sig->cpu_timers[1]);
-	INIT_LIST_HEAD(&sig->cpu_timers[2]);
 	taskstats_tgid_init(sig);
 
 	task_lock(current->group_leader);
 	memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim);
 	task_unlock(current->group_leader);
 
-	if (sig->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
-		/*
-		 * New sole thread in the process gets an expiry time
-		 * of the whole CPU time limit.
-		 */
-		tsk->it_prof_expires =
-			secs_to_cputime(sig->rlim[RLIMIT_CPU].rlim_cur);
-	}
+	posix_cpu_timers_init_group(sig);
+
 	acct_init_pacct(&sig->pacct);
 
 	tty_audit_fork(sig);
@@ -843,7 +869,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 
 void __cleanup_signal(struct signal_struct *sig)
 {
-	exit_thread_group_keys(sig);
+	thread_group_cputime_free(sig);
 	tty_kref_put(sig->tty);
 	kmem_cache_free(signal_cachep, sig);
 }
@@ -893,6 +919,19 @@ void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
 #endif /* CONFIG_MM_OWNER */
 
 /*
+ * Initialize POSIX timer handling for a single task.
+ */
+static void posix_cpu_timers_init(struct task_struct *tsk)
+{
+	tsk->cputime_expires.prof_exp = cputime_zero;
+	tsk->cputime_expires.virt_exp = cputime_zero;
+	tsk->cputime_expires.sched_exp = 0;
+	INIT_LIST_HEAD(&tsk->cpu_timers[0]);
+	INIT_LIST_HEAD(&tsk->cpu_timers[1]);
+	INIT_LIST_HEAD(&tsk->cpu_timers[2]);
+}
+
+/*
  * This creates a new process as a copy of the old one,
  * but does not actually start it yet.
  *
@@ -946,16 +985,16 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
 #endif
 	retval = -EAGAIN;
-	if (atomic_read(&p->user->processes) >=
+	if (atomic_read(&p->real_cred->user->processes) >=
 			p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
 		if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
-		    p->user != current->nsproxy->user_ns->root_user)
+		    p->real_cred->user != INIT_USER)
 			goto bad_fork_free;
 	}
 
-	atomic_inc(&p->user->__count);
-	atomic_inc(&p->user->processes);
-	get_group_info(p->group_info);
+	retval = copy_creds(p, clone_flags);
+	if (retval < 0)
+		goto bad_fork_free;
 
 	/*
 	 * If multiple threads are within copy_process(), then this check
@@ -994,6 +1033,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	p->prev_utime = cputime_zero;
 	p->prev_stime = cputime_zero;
 
+	p->default_timer_slack_ns = current->timer_slack_ns;
+
 #ifdef CONFIG_DETECT_SOFTLOCKUP
 	p->last_switch_count = 0;
 	p->last_switch_timestamp = 0;
@@ -1002,21 +1043,12 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	task_io_accounting_init(&p->ioac);
 	acct_clear_integrals(p);
 
-	p->it_virt_expires = cputime_zero;
-	p->it_prof_expires = cputime_zero;
-	p->it_sched_expires = 0;
-	INIT_LIST_HEAD(&p->cpu_timers[0]);
-	INIT_LIST_HEAD(&p->cpu_timers[1]);
-	INIT_LIST_HEAD(&p->cpu_timers[2]);
+	posix_cpu_timers_init(p);
 
 	p->lock_depth = -1;		/* -1 = no lock */
 	do_posix_clock_monotonic_gettime(&p->start_time);
 	p->real_start_time = p->start_time;
 	monotonic_to_bootbased(&p->real_start_time);
-#ifdef CONFIG_SECURITY
-	p->security = NULL;
-#endif
-	p->cap_bset = current->cap_bset;
 	p->io_context = NULL;
 	p->audit_context = NULL;
 	cgroup_fork(p);
@@ -1057,14 +1089,14 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #ifdef CONFIG_DEBUG_MUTEXES
 	p->blocked_on = NULL; /* not blocked yet */
 #endif
+	if (unlikely(ptrace_reparented(current)))
+		ptrace_fork(p, clone_flags);
 
 	/* Perform scheduler related setup. Assign this task to a CPU. */
 	sched_fork(p, clone_flags);
 
-	if ((retval = security_task_alloc(p)))
-		goto bad_fork_cleanup_policy;
 	if ((retval = audit_alloc(p)))
-		goto bad_fork_cleanup_security;
+		goto bad_fork_cleanup_policy;
 	/* copy all the process information */
 	if ((retval = copy_semundo(clone_flags, p)))
 		goto bad_fork_cleanup_audit;
@@ -1078,10 +1110,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 		goto bad_fork_cleanup_sighand;
 	if ((retval = copy_mm(clone_flags, p)))
 		goto bad_fork_cleanup_signal;
-	if ((retval = copy_keys(clone_flags, p)))
-		goto bad_fork_cleanup_mm;
 	if ((retval = copy_namespaces(clone_flags, p)))
-		goto bad_fork_cleanup_keys;
+		goto bad_fork_cleanup_mm;
 	if ((retval = copy_io(clone_flags, p)))
 		goto bad_fork_cleanup_namespaces;
 	retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs);
@@ -1101,6 +1131,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 		}
 	}
 
+	ftrace_graph_init_task(p);
+
 	p->pid = pid_nr(pid);
 	p->tgid = p->pid;
 	if (clone_flags & CLONE_THREAD)
@@ -1109,7 +1141,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	if (current->nsproxy != p->nsproxy) {
 		retval = ns_cgroup_clone(p, pid);
 		if (retval)
-			goto bad_fork_free_pid;
+			goto bad_fork_free_graph;
 	}
 
 	p->set_child_tid = (clone_flags & CLONE_CHILD_SETTID) ? child_tidptr : NULL;
@@ -1202,27 +1234,12 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 		spin_unlock(&current->sighand->siglock);
 		write_unlock_irq(&tasklist_lock);
 		retval = -ERESTARTNOINTR;
-		goto bad_fork_free_pid;
+		goto bad_fork_free_graph;
 	}
 
 	if (clone_flags & CLONE_THREAD) {
 		p->group_leader = current->group_leader;
 		list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group);
-
-		if (!cputime_eq(current->signal->it_virt_expires,
-				cputime_zero) ||
-		    !cputime_eq(current->signal->it_prof_expires,
-				cputime_zero) ||
-		    current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY ||
-		    !list_empty(&current->signal->cpu_timers[0]) ||
-		    !list_empty(&current->signal->cpu_timers[1]) ||
-		    !list_empty(&current->signal->cpu_timers[2])) {
-			/*
-			 * Have child wake up on its first tick to check
-			 * for process CPU timers.
-			 */
-			p->it_prof_expires = jiffies_to_cputime(1);
-		}
 	}
 
 	if (likely(p->pid)) {
@@ -1254,6 +1271,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	cgroup_post_fork(p);
 	return p;
 
+bad_fork_free_graph:
+	ftrace_graph_exit_task(p);
 bad_fork_free_pid:
 	if (pid != &init_struct_pid)
 		free_pid(pid);
@@ -1261,8 +1280,6 @@ bad_fork_cleanup_io:
 	put_io_context(p->io_context);
 bad_fork_cleanup_namespaces:
 	exit_task_namespaces(p);
-bad_fork_cleanup_keys:
-	exit_keys(p);
 bad_fork_cleanup_mm:
 	if (p->mm)
 		mmput(p->mm);
@@ -1278,8 +1295,6 @@ bad_fork_cleanup_semundo:
 	exit_sem(p);
 bad_fork_cleanup_audit:
 	audit_free(p);
-bad_fork_cleanup_security:
-	security_task_free(p);
 bad_fork_cleanup_policy:
 #ifdef CONFIG_NUMA
 	mpol_put(p->mempolicy);
@@ -1292,9 +1307,9 @@ bad_fork_cleanup_cgroup:
 bad_fork_cleanup_put_domain:
 	module_put(task_thread_info(p)->exec_domain->module);
 bad_fork_cleanup_count:
-	put_group_info(p->group_info);
-	atomic_dec(&p->user->processes);
-	free_uid(p->user);
+	atomic_dec(&p->cred->user->processes);
+	put_cred(p->real_cred);
+	put_cred(p->cred);
 bad_fork_free:
 	free_task(p);
 fork_out:
@@ -1338,6 +1353,21 @@ long do_fork(unsigned long clone_flags,
 	long nr;
 
 	/*
+	 * Do some preliminary argument and permissions checking before we
+	 * actually start allocating stuff
+	 */
+	if (clone_flags & CLONE_NEWUSER) {
+		if (clone_flags & CLONE_THREAD)
+			return -EINVAL;
+		/* hopefully this check will go away when userns support is
+		 * complete
+		 */
+		if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SETUID) ||
+				!capable(CAP_SETGID))
+			return -EPERM;
+	}
+
+	/*
 	 * We hope to recycle these flags after 2.6.26
 	 */
 	if (unlikely(clone_flags & CLONE_STOPPED)) {
@@ -1369,6 +1399,8 @@ long do_fork(unsigned long clone_flags,
 	if (!IS_ERR(p)) {
 		struct completion vfork;
 
+		trace_sched_process_fork(current, p);
+
 		nr = task_pid_vnr(p);
 
 		if (clone_flags & CLONE_PARENT_SETTID)
@@ -1379,6 +1411,7 @@ long do_fork(unsigned long clone_flags,
 			init_completion(&vfork);
 		}
 
+		audit_finish_fork(p);
 		tracehook_report_clone(trace, regs, clone_flags, nr, p);
 
 		/*
@@ -1582,8 +1615,7 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
 	err = -EINVAL;
 	if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND|
 				CLONE_VM|CLONE_FILES|CLONE_SYSVSEM|
-				CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWUSER|
-				CLONE_NEWNET))
+				CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET))
 		goto bad_unshare_out;
 
 	/*
diff --git a/kernel/freezer.c b/kernel/freezer.c
new file mode 100644
index 000000000000..2f4936cf7083
--- /dev/null
+++ b/kernel/freezer.c
@@ -0,0 +1,154 @@
+/*
+ * kernel/freezer.c - Function to freeze a process
+ *
+ * Originally from kernel/power/process.c
+ */
+
+#include <linux/interrupt.h>
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/syscalls.h>
+#include <linux/freezer.h>
+
+/*
+ * freezing is complete, mark current process as frozen
+ */
+static inline void frozen_process(void)
+{
+	if (!unlikely(current->flags & PF_NOFREEZE)) {
+		current->flags |= PF_FROZEN;
+		wmb();
+	}
+	clear_freeze_flag(current);
+}
+
+/* Refrigerator is place where frozen processes are stored :-). */
+void refrigerator(void)
+{
+	/* Hmm, should we be allowed to suspend when there are realtime
+	   processes around? */
+	long save;
+
+	task_lock(current);
+	if (freezing(current)) {
+		frozen_process();
+		task_unlock(current);
+	} else {
+		task_unlock(current);
+		return;
+	}
+	save = current->state;
+	pr_debug("%s entered refrigerator\n", current->comm);
+
+	spin_lock_irq(&current->sighand->siglock);
+	recalc_sigpending(); /* We sent fake signal, clean it up */
+	spin_unlock_irq(&current->sighand->siglock);
+
+	for (;;) {
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		if (!frozen(current))
+			break;
+		schedule();
+	}
+	pr_debug("%s left refrigerator\n", current->comm);
+	__set_current_state(save);
+}
+EXPORT_SYMBOL(refrigerator);
+
+static void fake_signal_wake_up(struct task_struct *p)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&p->sighand->siglock, flags);
+	signal_wake_up(p, 0);
+	spin_unlock_irqrestore(&p->sighand->siglock, flags);
+}
+
+/**
+ *	freeze_task - send a freeze request to given task
+ *	@p: task to send the request to
+ *	@sig_only: if set, the request will only be sent if the task has the
+ *		PF_FREEZER_NOSIG flag unset
+ *	Return value: 'false', if @sig_only is set and the task has
+ *		PF_FREEZER_NOSIG set or the task is frozen, 'true', otherwise
+ *
+ *	The freeze request is sent by setting the tasks's TIF_FREEZE flag and
+ *	either sending a fake signal to it or waking it up, depending on whether
+ *	or not it has PF_FREEZER_NOSIG set.  If @sig_only is set and the task
+ *	has PF_FREEZER_NOSIG set (ie. it is a typical kernel thread), its
+ *	TIF_FREEZE flag will not be set.
+ */
+bool freeze_task(struct task_struct *p, bool sig_only)
+{
+	/*
+	 * We first check if the task is freezing and next if it has already
+	 * been frozen to avoid the race with frozen_process() which first marks
+	 * the task as frozen and next clears its TIF_FREEZE.
+	 */
+	if (!freezing(p)) {
+		rmb();
+		if (frozen(p))
+			return false;
+
+		if (!sig_only || should_send_signal(p))
+			set_freeze_flag(p);
+		else
+			return false;
+	}
+
+	if (should_send_signal(p)) {
+		if (!signal_pending(p))
+			fake_signal_wake_up(p);
+	} else if (sig_only) {
+		return false;
+	} else {
+		wake_up_state(p, TASK_INTERRUPTIBLE);
+	}
+
+	return true;
+}
+
+void cancel_freezing(struct task_struct *p)
+{
+	unsigned long flags;
+
+	if (freezing(p)) {
+		pr_debug("  clean up: %s\n", p->comm);
+		clear_freeze_flag(p);
+		spin_lock_irqsave(&p->sighand->siglock, flags);
+		recalc_sigpending_and_wake(p);
+		spin_unlock_irqrestore(&p->sighand->siglock, flags);
+	}
+}
+
+static int __thaw_process(struct task_struct *p)
+{
+	if (frozen(p)) {
+		p->flags &= ~PF_FROZEN;
+		return 1;
+	}
+	clear_freeze_flag(p);
+	return 0;
+}
+
+/*
+ * Wake up a frozen process
+ *
+ * task_lock() is needed to prevent the race with refrigerator() which may
+ * occur if the freezing of tasks fails.  Namely, without the lock, if the
+ * freezing of tasks failed, thaw_tasks() might have run before a task in
+ * refrigerator() could call frozen_process(), in which case the task would be
+ * frozen and no one would thaw it.
+ */
+int thaw_process(struct task_struct *p)
+{
+	task_lock(p);
+	if (__thaw_process(p) == 1) {
+		task_unlock(p);
+		wake_up_process(p);
+		return 1;
+	}
+	task_unlock(p);
+	return 0;
+}
+EXPORT_SYMBOL(thaw_process);
diff --git a/kernel/futex.c b/kernel/futex.c
index 7d1136e97c14..7c6cbabe52b3 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -92,11 +92,12 @@ struct futex_pi_state {
  * A futex_q has a woken state, just like tasks have TASK_RUNNING.
  * It is considered woken when plist_node_empty(&q->list) || q->lock_ptr == 0.
  * The order of wakup is always to make the first condition true, then
- * wake up q->waiters, then make the second condition true.
+ * wake up q->waiter, then make the second condition true.
  */
 struct futex_q {
 	struct plist_node list;
-	wait_queue_head_t waiters;
+	/* There can only be a single waiter */
+	wait_queue_head_t waiter;
 
 	/* Which hash list lock to use: */
 	spinlock_t *lock_ptr;
@@ -123,24 +124,6 @@ struct futex_hash_bucket {
 static struct futex_hash_bucket futex_queues[1<<FUTEX_HASHBITS];
 
 /*
- * Take mm->mmap_sem, when futex is shared
- */
-static inline void futex_lock_mm(struct rw_semaphore *fshared)
-{
-	if (fshared)
-		down_read(fshared);
-}
-
-/*
- * Release mm->mmap_sem, when the futex is shared
- */
-static inline void futex_unlock_mm(struct rw_semaphore *fshared)
-{
-	if (fshared)
-		up_read(fshared);
-}
-
-/*
  * We hash on the keys returned from get_futex_key (see below).
  */
 static struct futex_hash_bucket *hash_futex(union futex_key *key)
@@ -161,6 +144,45 @@ static inline int match_futex(union futex_key *key1, union futex_key *key2)
 		&& key1->both.offset == key2->both.offset);
 }
 
+/*
+ * Take a reference to the resource addressed by a key.
+ * Can be called while holding spinlocks.
+ *
+ */
+static void get_futex_key_refs(union futex_key *key)
+{
+	if (!key->both.ptr)
+		return;
+
+	switch (key->both.offset & (FUT_OFF_INODE|FUT_OFF_MMSHARED)) {
+	case FUT_OFF_INODE:
+		atomic_inc(&key->shared.inode->i_count);
+		break;
+	case FUT_OFF_MMSHARED:
+		atomic_inc(&key->private.mm->mm_count);
+		break;
+	}
+}
+
+/*
+ * Drop a reference to the resource addressed by a key.
+ * The hash bucket spinlock must not be held.
+ */
+static void drop_futex_key_refs(union futex_key *key)
+{
+	if (!key->both.ptr)
+		return;
+
+	switch (key->both.offset & (FUT_OFF_INODE|FUT_OFF_MMSHARED)) {
+	case FUT_OFF_INODE:
+		iput(key->shared.inode);
+		break;
+	case FUT_OFF_MMSHARED:
+		mmdrop(key->private.mm);
+		break;
+	}
+}
+
 /**
  * get_futex_key - Get parameters which are the keys for a futex.
  * @uaddr: virtual address of the futex
@@ -179,12 +201,10 @@ static inline int match_futex(union futex_key *key1, union futex_key *key2)
  * For other futexes, it points to &current->mm->mmap_sem and
  * caller must have taken the reader lock. but NOT any spinlocks.
  */
-static int get_futex_key(u32 __user *uaddr, struct rw_semaphore *fshared,
-			 union futex_key *key)
+static int get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key)
 {
 	unsigned long address = (unsigned long)uaddr;
 	struct mm_struct *mm = current->mm;
-	struct vm_area_struct *vma;
 	struct page *page;
 	int err;
 
@@ -208,100 +228,50 @@ static int get_futex_key(u32 __user *uaddr, struct rw_semaphore *fshared,
 			return -EFAULT;
 		key->private.mm = mm;
 		key->private.address = address;
+		get_futex_key_refs(key);
 		return 0;
 	}
-	/*
-	 * The futex is hashed differently depending on whether
-	 * it's in a shared or private mapping.  So check vma first.
-	 */
-	vma = find_extend_vma(mm, address);
-	if (unlikely(!vma))
-		return -EFAULT;
 
-	/*
-	 * Permissions.
-	 */
-	if (unlikely((vma->vm_flags & (VM_IO|VM_READ)) != VM_READ))
-		return (vma->vm_flags & VM_IO) ? -EPERM : -EACCES;
+again:
+	err = get_user_pages_fast(address, 1, 0, &page);
+	if (err < 0)
+		return err;
+
+	lock_page(page);
+	if (!page->mapping) {
+		unlock_page(page);
+		put_page(page);
+		goto again;
+	}
 
 	/*
 	 * Private mappings are handled in a simple way.
 	 *
 	 * NOTE: When userspace waits on a MAP_SHARED mapping, even if
 	 * it's a read-only handle, it's expected that futexes attach to
-	 * the object not the particular process.  Therefore we use
-	 * VM_MAYSHARE here, not VM_SHARED which is restricted to shared
-	 * mappings of _writable_ handles.
+	 * the object not the particular process.
 	 */
-	if (likely(!(vma->vm_flags & VM_MAYSHARE))) {
-		key->both.offset |= FUT_OFF_MMSHARED; /* reference taken on mm */
+	if (PageAnon(page)) {
+		key->both.offset |= FUT_OFF_MMSHARED; /* ref taken on mm */
 		key->private.mm = mm;
 		key->private.address = address;
-		return 0;
+	} else {
+		key->both.offset |= FUT_OFF_INODE; /* inode-based key */
+		key->shared.inode = page->mapping->host;
+		key->shared.pgoff = page->index;
 	}
 
-	/*
-	 * Linear file mappings are also simple.
-	 */
-	key->shared.inode = vma->vm_file->f_path.dentry->d_inode;
-	key->both.offset |= FUT_OFF_INODE; /* inode-based key. */
-	if (likely(!(vma->vm_flags & VM_NONLINEAR))) {
-		key->shared.pgoff = (((address - vma->vm_start) >> PAGE_SHIFT)
-				     + vma->vm_pgoff);
-		return 0;
-	}
+	get_futex_key_refs(key);
 
-	/*
-	 * We could walk the page table to read the non-linear
-	 * pte, and get the page index without fetching the page
-	 * from swap.  But that's a lot of code to duplicate here
-	 * for a rare case, so we simply fetch the page.
-	 */
-	err = get_user_pages(current, mm, address, 1, 0, 0, &page, NULL);
-	if (err >= 0) {
-		key->shared.pgoff =
-			page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
-		put_page(page);
-		return 0;
-	}
-	return err;
-}
-
-/*
- * Take a reference to the resource addressed by a key.
- * Can be called while holding spinlocks.
- *
- */
-static void get_futex_key_refs(union futex_key *key)
-{
-	if (key->both.ptr == NULL)
-		return;
-	switch (key->both.offset & (FUT_OFF_INODE|FUT_OFF_MMSHARED)) {
-		case FUT_OFF_INODE:
-			atomic_inc(&key->shared.inode->i_count);
-			break;
-		case FUT_OFF_MMSHARED:
-			atomic_inc(&key->private.mm->mm_count);
-			break;
-	}
+	unlock_page(page);
+	put_page(page);
+	return 0;
 }
 
-/*
- * Drop a reference to the resource addressed by a key.
- * The hash bucket spinlock must not be held.
- */
-static void drop_futex_key_refs(union futex_key *key)
+static inline
+void put_futex_key(int fshared, union futex_key *key)
 {
-	if (!key->both.ptr)
-		return;
-	switch (key->both.offset & (FUT_OFF_INODE|FUT_OFF_MMSHARED)) {
-		case FUT_OFF_INODE:
-			iput(key->shared.inode);
-			break;
-		case FUT_OFF_MMSHARED:
-			mmdrop(key->private.mm);
-			break;
-	}
+	drop_futex_key_refs(key);
 }
 
 static u32 cmpxchg_futex_value_locked(u32 __user *uaddr, u32 uval, u32 newval)
@@ -328,10 +298,8 @@ static int get_futex_value_locked(u32 *dest, u32 __user *from)
 
 /*
  * Fault handling.
- * if fshared is non NULL, current->mm->mmap_sem is already held
  */
-static int futex_handle_fault(unsigned long address,
-			      struct rw_semaphore *fshared, int attempt)
+static int futex_handle_fault(unsigned long address, int attempt)
 {
 	struct vm_area_struct * vma;
 	struct mm_struct *mm = current->mm;
@@ -340,8 +308,7 @@ static int futex_handle_fault(unsigned long address,
 	if (attempt > 2)
 		return ret;
 
-	if (!fshared)
-		down_read(&mm->mmap_sem);
+	down_read(&mm->mmap_sem);
 	vma = find_vma(mm, address);
 	if (vma && address >= vma->vm_start &&
 	    (vma->vm_flags & VM_WRITE)) {
@@ -361,8 +328,7 @@ static int futex_handle_fault(unsigned long address,
 				current->min_flt++;
 		}
 	}
-	if (!fshared)
-		up_read(&mm->mmap_sem);
+	up_read(&mm->mmap_sem);
 	return ret;
 }
 
@@ -385,6 +351,7 @@ static int refill_pi_state_cache(void)
 	/* pi_mutex gets initialized later */
 	pi_state->owner = NULL;
 	atomic_set(&pi_state->refcount, 1);
+	pi_state->key = FUTEX_KEY_INIT;
 
 	current->pi_state_cache = pi_state;
 
@@ -439,13 +406,20 @@ static void free_pi_state(struct futex_pi_state *pi_state)
 static struct task_struct * futex_find_get_task(pid_t pid)
 {
 	struct task_struct *p;
+	const struct cred *cred = current_cred(), *pcred;
 
 	rcu_read_lock();
 	p = find_task_by_vpid(pid);
-	if (!p || ((current->euid != p->euid) && (current->euid != p->uid)))
+	if (!p) {
 		p = ERR_PTR(-ESRCH);
-	else
-		get_task_struct(p);
+	} else {
+		pcred = __task_cred(p);
+		if (cred->euid != pcred->euid &&
+		    cred->euid != pcred->uid)
+			p = ERR_PTR(-ESRCH);
+		else
+			get_task_struct(p);
+	}
 
 	rcu_read_unlock();
 
@@ -462,7 +436,7 @@ void exit_pi_state_list(struct task_struct *curr)
 	struct list_head *next, *head = &curr->pi_state_list;
 	struct futex_pi_state *pi_state;
 	struct futex_hash_bucket *hb;
-	union futex_key key;
+	union futex_key key = FUTEX_KEY_INIT;
 
 	if (!futex_cmpxchg_enabled)
 		return;
@@ -607,7 +581,7 @@ static void wake_futex(struct futex_q *q)
 	 * The lock in wake_up_all() is a crucial memory barrier after the
 	 * plist_del() and also before assigning to q->lock_ptr.
 	 */
-	wake_up_all(&q->waiters);
+	wake_up(&q->waiter);
 	/*
 	 * The waiting task can free the futex_q as soon as this is written,
 	 * without taking any locks.  This must come last.
@@ -719,20 +693,17 @@ double_lock_hb(struct futex_hash_bucket *hb1, struct futex_hash_bucket *hb2)
  * Wake up all waiters hashed on the physical page that is mapped
  * to this virtual address:
  */
-static int futex_wake(u32 __user *uaddr, struct rw_semaphore *fshared,
-		      int nr_wake, u32 bitset)
+static int futex_wake(u32 __user *uaddr, int fshared, int nr_wake, u32 bitset)
 {
 	struct futex_hash_bucket *hb;
 	struct futex_q *this, *next;
 	struct plist_head *head;
-	union futex_key key;
+	union futex_key key = FUTEX_KEY_INIT;
 	int ret;
 
 	if (!bitset)
 		return -EINVAL;
 
-	futex_lock_mm(fshared);
-
 	ret = get_futex_key(uaddr, fshared, &key);
 	if (unlikely(ret != 0))
 		goto out;
@@ -760,7 +731,7 @@ static int futex_wake(u32 __user *uaddr, struct rw_semaphore *fshared,
 
 	spin_unlock(&hb->lock);
 out:
-	futex_unlock_mm(fshared);
+	put_futex_key(fshared, &key);
 	return ret;
 }
 
@@ -769,19 +740,16 @@ out:
  * to this virtual address:
  */
 static int
-futex_wake_op(u32 __user *uaddr1, struct rw_semaphore *fshared,
-	      u32 __user *uaddr2,
+futex_wake_op(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
 	      int nr_wake, int nr_wake2, int op)
 {
-	union futex_key key1, key2;
+	union futex_key key1 = FUTEX_KEY_INIT, key2 = FUTEX_KEY_INIT;
 	struct futex_hash_bucket *hb1, *hb2;
 	struct plist_head *head;
 	struct futex_q *this, *next;
 	int ret, op_ret, attempt = 0;
 
 retryfull:
-	futex_lock_mm(fshared);
-
 	ret = get_futex_key(uaddr1, fshared, &key1);
 	if (unlikely(ret != 0))
 		goto out;
@@ -826,18 +794,12 @@ retry:
 		 */
 		if (attempt++) {
 			ret = futex_handle_fault((unsigned long)uaddr2,
-						 fshared, attempt);
+						 attempt);
 			if (ret)
 				goto out;
 			goto retry;
 		}
 
-		/*
-		 * If we would have faulted, release mmap_sem,
-		 * fault it in and start all over again.
-		 */
-		futex_unlock_mm(fshared);
-
 		ret = get_user(dummy, uaddr2);
 		if (ret)
 			return ret;
@@ -873,7 +835,8 @@ retry:
 	if (hb1 != hb2)
 		spin_unlock(&hb2->lock);
 out:
-	futex_unlock_mm(fshared);
+	put_futex_key(fshared, &key2);
+	put_futex_key(fshared, &key1);
 
 	return ret;
 }
@@ -882,19 +845,16 @@ out:
  * Requeue all waiters hashed on one physical page to another
  * physical page.
  */
-static int futex_requeue(u32 __user *uaddr1, struct rw_semaphore *fshared,
-			 u32 __user *uaddr2,
+static int futex_requeue(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
 			 int nr_wake, int nr_requeue, u32 *cmpval)
 {
-	union futex_key key1, key2;
+	union futex_key key1 = FUTEX_KEY_INIT, key2 = FUTEX_KEY_INIT;
 	struct futex_hash_bucket *hb1, *hb2;
 	struct plist_head *head1;
 	struct futex_q *this, *next;
 	int ret, drop_count = 0;
 
  retry:
-	futex_lock_mm(fshared);
-
 	ret = get_futex_key(uaddr1, fshared, &key1);
 	if (unlikely(ret != 0))
 		goto out;
@@ -917,12 +877,6 @@ static int futex_requeue(u32 __user *uaddr1, struct rw_semaphore *fshared,
 			if (hb1 != hb2)
 				spin_unlock(&hb2->lock);
 
-			/*
-			 * If we would have faulted, release mmap_sem, fault
-			 * it in and start all over again.
-			 */
-			futex_unlock_mm(fshared);
-
 			ret = get_user(curval, uaddr1);
 
 			if (!ret)
@@ -974,7 +928,8 @@ out_unlock:
 		drop_futex_key_refs(&key1);
 
 out:
-	futex_unlock_mm(fshared);
+	put_futex_key(fshared, &key2);
+	put_futex_key(fshared, &key1);
 	return ret;
 }
 
@@ -983,7 +938,7 @@ static inline struct futex_hash_bucket *queue_lock(struct futex_q *q)
 {
 	struct futex_hash_bucket *hb;
 
-	init_waitqueue_head(&q->waiters);
+	init_waitqueue_head(&q->waiter);
 
 	get_futex_key_refs(&q->key);
 	hb = hash_futex(&q->key);
@@ -1096,8 +1051,7 @@ static void unqueue_me_pi(struct futex_q *q)
  * private futexes.
  */
 static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
-				struct task_struct *newowner,
-				struct rw_semaphore *fshared)
+				struct task_struct *newowner, int fshared)
 {
 	u32 newtid = task_pid_vnr(newowner) | FUTEX_WAITERS;
 	struct futex_pi_state *pi_state = q->pi_state;
@@ -1176,7 +1130,7 @@ retry:
 handle_fault:
 	spin_unlock(q->lock_ptr);
 
-	ret = futex_handle_fault((unsigned long)uaddr, fshared, attempt++);
+	ret = futex_handle_fault((unsigned long)uaddr, attempt++);
 
 	spin_lock(q->lock_ptr);
 
@@ -1196,12 +1150,13 @@ handle_fault:
  * In case we must use restart_block to restart a futex_wait,
  * we encode in the 'flags' shared capability
  */
-#define FLAGS_SHARED  1
+#define FLAGS_SHARED		0x01
+#define FLAGS_CLOCKRT		0x02
 
 static long futex_wait_restart(struct restart_block *restart);
 
-static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
-		      u32 val, ktime_t *abs_time, u32 bitset)
+static int futex_wait(u32 __user *uaddr, int fshared,
+		      u32 val, ktime_t *abs_time, u32 bitset, int clockrt)
 {
 	struct task_struct *curr = current;
 	DECLARE_WAITQUEUE(wait, curr);
@@ -1218,8 +1173,7 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
 	q.pi_state = NULL;
 	q.bitset = bitset;
  retry:
-	futex_lock_mm(fshared);
-
+	q.key = FUTEX_KEY_INIT;
 	ret = get_futex_key(uaddr, fshared, &q.key);
 	if (unlikely(ret != 0))
 		goto out_release_sem;
@@ -1251,12 +1205,6 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
 	if (unlikely(ret)) {
 		queue_unlock(&q, hb);
 
-		/*
-		 * If we would have faulted, release mmap_sem, fault it in and
-		 * start all over again.
-		 */
-		futex_unlock_mm(fshared);
-
 		ret = get_user(uval, uaddr);
 
 		if (!ret)
@@ -1271,12 +1219,6 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
 	queue_me(&q, hb);
 
 	/*
-	 * Now the futex is queued and we have checked the data, we
-	 * don't want to hold mmap_sem while we sleep.
-	 */
-	futex_unlock_mm(fshared);
-
-	/*
 	 * There might have been scheduling since the queue_me(), as we
 	 * cannot hold a spinlock across the get_user() in case it
 	 * faults, and we cannot just set TASK_INTERRUPTIBLE state when
@@ -1287,7 +1229,7 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
 
 	/* add_wait_queue is the barrier after __set_current_state. */
 	__set_current_state(TASK_INTERRUPTIBLE);
-	add_wait_queue(&q.waiters, &wait);
+	add_wait_queue(&q.waiter, &wait);
 	/*
 	 * !plist_node_empty() is safe here without any lock.
 	 * q.lock_ptr != 0 is not safe, because of ordering against wakeup.
@@ -1296,13 +1238,18 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
 		if (!abs_time)
 			schedule();
 		else {
-			hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC,
-						HRTIMER_MODE_ABS);
+			unsigned long slack;
+			slack = current->timer_slack_ns;
+			if (rt_task(current))
+				slack = 0;
+			hrtimer_init_on_stack(&t.timer,
+					      clockrt ? CLOCK_REALTIME :
+					      CLOCK_MONOTONIC,
+					      HRTIMER_MODE_ABS);
 			hrtimer_init_sleeper(&t, current);
-			t.timer.expires = *abs_time;
+			hrtimer_set_expires_range_ns(&t.timer, *abs_time, slack);
 
-			hrtimer_start(&t.timer, t.timer.expires,
-						HRTIMER_MODE_ABS);
+			hrtimer_start_expires(&t.timer, HRTIMER_MODE_ABS);
 			if (!hrtimer_active(&t.timer))
 				t.task = NULL;
 
@@ -1353,6 +1300,8 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
 
 		if (fshared)
 			restart->futex.flags |= FLAGS_SHARED;
+		if (clockrt)
+			restart->futex.flags |= FLAGS_CLOCKRT;
 		return -ERESTART_RESTARTBLOCK;
 	}
 
@@ -1360,7 +1309,7 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
 	queue_unlock(&q, hb);
 
  out_release_sem:
-	futex_unlock_mm(fshared);
+	put_futex_key(fshared, &q.key);
 	return ret;
 }
 
@@ -1368,15 +1317,16 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
 static long futex_wait_restart(struct restart_block *restart)
 {
 	u32 __user *uaddr = (u32 __user *)restart->futex.uaddr;
-	struct rw_semaphore *fshared = NULL;
+	int fshared = 0;
 	ktime_t t;
 
 	t.tv64 = restart->futex.time;
 	restart->fn = do_no_restart_syscall;
 	if (restart->futex.flags & FLAGS_SHARED)
-		fshared = &current->mm->mmap_sem;
+		fshared = 1;
 	return (long)futex_wait(uaddr, fshared, restart->futex.val, &t,
-				restart->futex.bitset);
+				restart->futex.bitset,
+				restart->futex.flags & FLAGS_CLOCKRT);
 }
 
 
@@ -1386,7 +1336,7 @@ static long futex_wait_restart(struct restart_block *restart)
  * if there are waiters then it will block, it does PI, etc. (Due to
  * races the kernel might see a 0 value of the futex too.)
  */
-static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
+static int futex_lock_pi(u32 __user *uaddr, int fshared,
 			 int detect, ktime_t *time, int trylock)
 {
 	struct hrtimer_sleeper timeout, *to = NULL;
@@ -1404,13 +1354,12 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
 		hrtimer_init_on_stack(&to->timer, CLOCK_REALTIME,
 				      HRTIMER_MODE_ABS);
 		hrtimer_init_sleeper(to, current);
-		to->timer.expires = *time;
+		hrtimer_set_expires(&to->timer, *time);
 	}
 
 	q.pi_state = NULL;
  retry:
-	futex_lock_mm(fshared);
-
+	q.key = FUTEX_KEY_INIT;
 	ret = get_futex_key(uaddr, fshared, &q.key);
 	if (unlikely(ret != 0))
 		goto out_release_sem;
@@ -1499,7 +1448,6 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
 			 * exit to complete.
 			 */
 			queue_unlock(&q, hb);
-			futex_unlock_mm(fshared);
 			cond_resched();
 			goto retry;
 
@@ -1531,12 +1479,6 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
 	 */
 	queue_me(&q, hb);
 
-	/*
-	 * Now the futex is queued and we have checked the data, we
-	 * don't want to hold mmap_sem while we sleep.
-	 */
-	futex_unlock_mm(fshared);
-
 	WARN_ON(!q.pi_state);
 	/*
 	 * Block on the PI mutex:
@@ -1549,7 +1491,6 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
 		ret = ret ? 0 : -EWOULDBLOCK;
 	}
 
-	futex_lock_mm(fshared);
 	spin_lock(q.lock_ptr);
 
 	if (!ret) {
@@ -1615,7 +1556,6 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
 
 	/* Unqueue and drop the lock */
 	unqueue_me_pi(&q);
-	futex_unlock_mm(fshared);
 
 	if (to)
 		destroy_hrtimer_on_stack(&to->timer);
@@ -1625,34 +1565,30 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
 	queue_unlock(&q, hb);
 
  out_release_sem:
-	futex_unlock_mm(fshared);
+	put_futex_key(fshared, &q.key);
 	if (to)
 		destroy_hrtimer_on_stack(&to->timer);
 	return ret;
 
  uaddr_faulted:
 	/*
-	 * We have to r/w  *(int __user *)uaddr, but we can't modify it
-	 * non-atomically.  Therefore, if get_user below is not
-	 * enough, we need to handle the fault ourselves, while
-	 * still holding the mmap_sem.
-	 *
-	 * ... and hb->lock. :-) --ANK
+	 * We have to r/w  *(int __user *)uaddr, and we have to modify it
+	 * atomically.  Therefore, if we continue to fault after get_user()
+	 * below, we need to handle the fault ourselves, while still holding
+	 * the mmap_sem.  This can occur if the uaddr is under contention as
+	 * we have to drop the mmap_sem in order to call get_user().
 	 */
 	queue_unlock(&q, hb);
 
 	if (attempt++) {
-		ret = futex_handle_fault((unsigned long)uaddr, fshared,
-					 attempt);
+		ret = futex_handle_fault((unsigned long)uaddr, attempt);
 		if (ret)
 			goto out_release_sem;
 		goto retry_unlocked;
 	}
 
-	futex_unlock_mm(fshared);
-
 	ret = get_user(uval, uaddr);
-	if (!ret && (uval != -EFAULT))
+	if (!ret)
 		goto retry;
 
 	if (to)
@@ -1665,13 +1601,13 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
  * This is the in-kernel slowpath: we look up the PI state (if any),
  * and do the rt-mutex unlock.
  */
-static int futex_unlock_pi(u32 __user *uaddr, struct rw_semaphore *fshared)
+static int futex_unlock_pi(u32 __user *uaddr, int fshared)
 {
 	struct futex_hash_bucket *hb;
 	struct futex_q *this, *next;
 	u32 uval;
 	struct plist_head *head;
-	union futex_key key;
+	union futex_key key = FUTEX_KEY_INIT;
 	int ret, attempt = 0;
 
 retry:
@@ -1682,10 +1618,6 @@ retry:
 	 */
 	if ((uval & FUTEX_TID_MASK) != task_pid_vnr(current))
 		return -EPERM;
-	/*
-	 * First take all the futex related locks:
-	 */
-	futex_lock_mm(fshared);
 
 	ret = get_futex_key(uaddr, fshared, &key);
 	if (unlikely(ret != 0))
@@ -1744,34 +1676,30 @@ retry_unlocked:
 out_unlock:
 	spin_unlock(&hb->lock);
 out:
-	futex_unlock_mm(fshared);
+	put_futex_key(fshared, &key);
 
 	return ret;
 
 pi_faulted:
 	/*
-	 * We have to r/w  *(int __user *)uaddr, but we can't modify it
-	 * non-atomically.  Therefore, if get_user below is not
-	 * enough, we need to handle the fault ourselves, while
-	 * still holding the mmap_sem.
-	 *
-	 * ... and hb->lock. --ANK
+	 * We have to r/w  *(int __user *)uaddr, and we have to modify it
+	 * atomically.  Therefore, if we continue to fault after get_user()
+	 * below, we need to handle the fault ourselves, while still holding
+	 * the mmap_sem.  This can occur if the uaddr is under contention as
+	 * we have to drop the mmap_sem in order to call get_user().
 	 */
 	spin_unlock(&hb->lock);
 
 	if (attempt++) {
-		ret = futex_handle_fault((unsigned long)uaddr, fshared,
-					 attempt);
+		ret = futex_handle_fault((unsigned long)uaddr, attempt);
 		if (ret)
 			goto out;
 		uval = 0;
 		goto retry_unlocked;
 	}
 
-	futex_unlock_mm(fshared);
-
 	ret = get_user(uval, uaddr);
-	if (!ret && (uval != -EFAULT))
+	if (!ret)
 		goto retry;
 
 	return ret;
@@ -1826,6 +1754,7 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr,
 {
 	struct robust_list_head __user *head;
 	unsigned long ret;
+	const struct cred *cred = current_cred(), *pcred;
 
 	if (!futex_cmpxchg_enabled)
 		return -ENOSYS;
@@ -1841,8 +1770,10 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr,
 		if (!p)
 			goto err_unlock;
 		ret = -EPERM;
-		if ((current->euid != p->euid) && (current->euid != p->uid) &&
-				!capable(CAP_SYS_PTRACE))
+		pcred = __task_cred(p);
+		if (cred->euid != pcred->euid &&
+		    cred->euid != pcred->uid &&
+		    !capable(CAP_SYS_PTRACE))
 			goto err_unlock;
 		head = p->robust_list;
 		rcu_read_unlock();
@@ -1895,8 +1826,7 @@ retry:
 		 * PI futexes happens in exit_pi_state():
 		 */
 		if (!pi && (uval & FUTEX_WAITERS))
-			futex_wake(uaddr, &curr->mm->mmap_sem, 1,
-				   FUTEX_BITSET_MATCH_ANY);
+			futex_wake(uaddr, 1, 1, FUTEX_BITSET_MATCH_ANY);
 	}
 	return 0;
 }
@@ -1990,18 +1920,22 @@ void exit_robust_list(struct task_struct *curr)
 long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
 		u32 __user *uaddr2, u32 val2, u32 val3)
 {
-	int ret = -ENOSYS;
+	int clockrt, ret = -ENOSYS;
 	int cmd = op & FUTEX_CMD_MASK;
-	struct rw_semaphore *fshared = NULL;
+	int fshared = 0;
 
 	if (!(op & FUTEX_PRIVATE_FLAG))
-		fshared = &current->mm->mmap_sem;
+		fshared = 1;
+
+	clockrt = op & FUTEX_CLOCK_REALTIME;
+	if (clockrt && cmd != FUTEX_WAIT_BITSET)
+		return -ENOSYS;
 
 	switch (cmd) {
 	case FUTEX_WAIT:
 		val3 = FUTEX_BITSET_MATCH_ANY;
 	case FUTEX_WAIT_BITSET:
-		ret = futex_wait(uaddr, fshared, val, timeout, val3);
+		ret = futex_wait(uaddr, fshared, val, timeout, val3, clockrt);
 		break;
 	case FUTEX_WAKE:
 		val3 = FUTEX_BITSET_MATCH_ANY;
diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index 04ac3a9e42cf..d607a5b9ee29 100644
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -135,6 +135,7 @@ compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 {
 	struct compat_robust_list_head __user *head;
 	unsigned long ret;
+	const struct cred *cred = current_cred(), *pcred;
 
 	if (!futex_cmpxchg_enabled)
 		return -ENOSYS;
@@ -150,8 +151,10 @@ compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 		if (!p)
 			goto err_unlock;
 		ret = -EPERM;
-		if ((current->euid != p->euid) && (current->euid != p->uid) &&
-				!capable(CAP_SYS_PTRACE))
+		pcred = __task_cred(p);
+		if (cred->euid != pcred->euid &&
+		    cred->euid != pcred->uid &&
+		    !capable(CAP_SYS_PTRACE))
 			goto err_unlock;
 		head = p->compat_robust_list;
 		read_unlock(&tasklist_lock);
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index cdec83e722fa..bda9cb924276 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -442,22 +442,6 @@ static inline void debug_hrtimer_activate(struct hrtimer *timer) { }
 static inline void debug_hrtimer_deactivate(struct hrtimer *timer) { }
 #endif
 
-/*
- * Check, whether the timer is on the callback pending list
- */
-static inline int hrtimer_cb_pending(const struct hrtimer *timer)
-{
-	return timer->state & HRTIMER_STATE_PENDING;
-}
-
-/*
- * Remove a timer from the callback pending list
- */
-static inline void hrtimer_remove_cb_pending(struct hrtimer *timer)
-{
-	list_del_init(&timer->cb_entry);
-}
-
 /* High resolution timer related functions */
 #ifdef CONFIG_HIGH_RES_TIMERS
 
@@ -517,7 +501,7 @@ static void hrtimer_force_reprogram(struct hrtimer_cpu_base *cpu_base)
 		if (!base->first)
 			continue;
 		timer = rb_entry(base->first, struct hrtimer, node);
-		expires = ktime_sub(timer->expires, base->offset);
+		expires = ktime_sub(hrtimer_get_expires(timer), base->offset);
 		if (expires.tv64 < cpu_base->expires_next.tv64)
 			cpu_base->expires_next = expires;
 	}
@@ -539,10 +523,10 @@ static int hrtimer_reprogram(struct hrtimer *timer,
 			     struct hrtimer_clock_base *base)
 {
 	ktime_t *expires_next = &__get_cpu_var(hrtimer_bases).expires_next;
-	ktime_t expires = ktime_sub(timer->expires, base->offset);
+	ktime_t expires = ktime_sub(hrtimer_get_expires(timer), base->offset);
 	int res;
 
-	WARN_ON_ONCE(timer->expires.tv64 < 0);
+	WARN_ON_ONCE(hrtimer_get_expires_tv64(timer) < 0);
 
 	/*
 	 * When the callback is running, we do not reprogram the clock event
@@ -651,6 +635,8 @@ static inline void hrtimer_init_timer_hres(struct hrtimer *timer)
 {
 }
 
+static void __run_hrtimer(struct hrtimer *timer);
+
 /*
  * When High resolution timers are active, try to reprogram. Note, that in case
  * the state has HRTIMER_STATE_CALLBACK set, no reprogramming and no expiry
@@ -661,40 +647,14 @@ static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
 					    struct hrtimer_clock_base *base)
 {
 	if (base->cpu_base->hres_active && hrtimer_reprogram(timer, base)) {
-
-		/* Timer is expired, act upon the callback mode */
-		switch(timer->cb_mode) {
-		case HRTIMER_CB_IRQSAFE_NO_RESTART:
-			debug_hrtimer_deactivate(timer);
-			/*
-			 * We can call the callback from here. No restart
-			 * happens, so no danger of recursion
-			 */
-			BUG_ON(timer->function(timer) != HRTIMER_NORESTART);
-			return 1;
-		case HRTIMER_CB_IRQSAFE_PERCPU:
-		case HRTIMER_CB_IRQSAFE_UNLOCKED:
-			/*
-			 * This is solely for the sched tick emulation with
-			 * dynamic tick support to ensure that we do not
-			 * restart the tick right on the edge and end up with
-			 * the tick timer in the softirq ! The calling site
-			 * takes care of this. Also used for hrtimer sleeper !
-			 */
-			debug_hrtimer_deactivate(timer);
-			return 1;
-		case HRTIMER_CB_IRQSAFE:
-		case HRTIMER_CB_SOFTIRQ:
-			/*
-			 * Move everything else into the softirq pending list !
-			 */
-			list_add_tail(&timer->cb_entry,
-				      &base->cpu_base->cb_pending);
-			timer->state = HRTIMER_STATE_PENDING;
-			return 1;
-		default:
-			BUG();
-		}
+		/*
+		 * XXX: recursion check?
+		 * hrtimer_forward() should round up with timer granularity
+		 * so that we never get into inf recursion here,
+		 * it doesn't do that though
+		 */
+		__run_hrtimer(timer);
+		return 1;
 	}
 	return 0;
 }
@@ -733,11 +693,6 @@ static int hrtimer_switch_to_hres(void)
 	return 1;
 }
 
-static inline void hrtimer_raise_softirq(void)
-{
-	raise_softirq(HRTIMER_SOFTIRQ);
-}
-
 #else
 
 static inline int hrtimer_hres_active(void) { return 0; }
@@ -756,7 +711,6 @@ static inline int hrtimer_reprogram(struct hrtimer *timer,
 {
 	return 0;
 }
-static inline void hrtimer_raise_softirq(void) { }
 
 #endif /* CONFIG_HIGH_RES_TIMERS */
 
@@ -795,7 +749,7 @@ u64 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
 	u64 orun = 1;
 	ktime_t delta;
 
-	delta = ktime_sub(now, timer->expires);
+	delta = ktime_sub(now, hrtimer_get_expires(timer));
 
 	if (delta.tv64 < 0)
 		return 0;
@@ -807,8 +761,8 @@ u64 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
 		s64 incr = ktime_to_ns(interval);
 
 		orun = ktime_divns(delta, incr);
-		timer->expires = ktime_add_ns(timer->expires, incr * orun);
-		if (timer->expires.tv64 > now.tv64)
+		hrtimer_add_expires_ns(timer, incr * orun);
+		if (hrtimer_get_expires_tv64(timer) > now.tv64)
 			return orun;
 		/*
 		 * This (and the ktime_add() below) is the
@@ -816,7 +770,7 @@ u64 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
 		 */
 		orun++;
 	}
-	timer->expires = ktime_add_safe(timer->expires, interval);
+	hrtimer_add_expires(timer, interval);
 
 	return orun;
 }
@@ -848,7 +802,8 @@ static void enqueue_hrtimer(struct hrtimer *timer,
 		 * We dont care about collisions. Nodes with
 		 * the same expiry time stay together.
 		 */
-		if (timer->expires.tv64 < entry->expires.tv64) {
+		if (hrtimer_get_expires_tv64(timer) <
+				hrtimer_get_expires_tv64(entry)) {
 			link = &(*link)->rb_left;
 		} else {
 			link = &(*link)->rb_right;
@@ -898,10 +853,7 @@ static void __remove_hrtimer(struct hrtimer *timer,
 			     struct hrtimer_clock_base *base,
 			     unsigned long newstate, int reprogram)
 {
-	/* High res. callback list. NOP for !HIGHRES */
-	if (hrtimer_cb_pending(timer))
-		hrtimer_remove_cb_pending(timer);
-	else {
+	if (timer->state & HRTIMER_STATE_ENQUEUED) {
 		/*
 		 * Remove the timer from the rbtree and replace the
 		 * first entry pointer if necessary.
@@ -945,9 +897,10 @@ remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base)
 }
 
 /**
- * hrtimer_start - (re)start an relative timer on the current CPU
+ * hrtimer_start_range_ns - (re)start an hrtimer on the current CPU
  * @timer:	the timer to be added
  * @tim:	expiry time
+ * @delta_ns:	"slack" range for the timer
  * @mode:	expiry mode: absolute (HRTIMER_ABS) or relative (HRTIMER_REL)
  *
  * Returns:
@@ -955,11 +908,12 @@ remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base)
  *  1 when the timer was active
  */
 int
-hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
+hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, unsigned long delta_ns,
+			const enum hrtimer_mode mode)
 {
 	struct hrtimer_clock_base *base, *new_base;
 	unsigned long flags;
-	int ret, raise;
+	int ret;
 
 	base = lock_hrtimer_base(timer, &flags);
 
@@ -983,7 +937,7 @@ hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
 #endif
 	}
 
-	timer->expires = tim;
+	hrtimer_set_expires_range_ns(timer, tim, delta_ns);
 
 	timer_stats_hrtimer_set_start_info(timer);
 
@@ -994,30 +948,30 @@ hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
 	enqueue_hrtimer(timer, new_base,
 			new_base->cpu_base == &__get_cpu_var(hrtimer_bases));
 
-	/*
-	 * The timer may be expired and moved to the cb_pending
-	 * list. We can not raise the softirq with base lock held due
-	 * to a possible deadlock with runqueue lock.
-	 */
-	raise = timer->state == HRTIMER_STATE_PENDING;
-
-	/*
-	 * We use preempt_disable to prevent this task from migrating after
-	 * setting up the softirq and raising it. Otherwise, if me migrate
-	 * we will raise the softirq on the wrong CPU.
-	 */
-	preempt_disable();
-
 	unlock_hrtimer_base(timer, &flags);
 
-	if (raise)
-		hrtimer_raise_softirq();
-	preempt_enable();
-
 	return ret;
 }
+EXPORT_SYMBOL_GPL(hrtimer_start_range_ns);
+
+/**
+ * hrtimer_start - (re)start an hrtimer on the current CPU
+ * @timer:	the timer to be added
+ * @tim:	expiry time
+ * @mode:	expiry mode: absolute (HRTIMER_ABS) or relative (HRTIMER_REL)
+ *
+ * Returns:
+ *  0 on success
+ *  1 when the timer was active
+ */
+int
+hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
+{
+	return hrtimer_start_range_ns(timer, tim, 0, mode);
+}
 EXPORT_SYMBOL_GPL(hrtimer_start);
 
+
 /**
  * hrtimer_try_to_cancel - try to deactivate a timer
  * @timer:	hrtimer to stop
@@ -1077,7 +1031,7 @@ ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
 	ktime_t rem;
 
 	base = lock_hrtimer_base(timer, &flags);
-	rem = ktime_sub(timer->expires, base->get_time());
+	rem = hrtimer_expires_remaining(timer);
 	unlock_hrtimer_base(timer, &flags);
 
 	return rem;
@@ -1109,7 +1063,7 @@ ktime_t hrtimer_get_next_event(void)
 				continue;
 
 			timer = rb_entry(base->first, struct hrtimer, node);
-			delta.tv64 = timer->expires.tv64;
+			delta.tv64 = hrtimer_get_expires_tv64(timer);
 			delta = ktime_sub(delta, base->get_time());
 			if (delta.tv64 < mindelta.tv64)
 				mindelta.tv64 = delta.tv64;
@@ -1180,60 +1134,6 @@ int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp)
 }
 EXPORT_SYMBOL_GPL(hrtimer_get_res);
 
-static void run_hrtimer_pending(struct hrtimer_cpu_base *cpu_base)
-{
-	spin_lock_irq(&cpu_base->lock);
-
-	while (!list_empty(&cpu_base->cb_pending)) {
-		enum hrtimer_restart (*fn)(struct hrtimer *);
-		struct hrtimer *timer;
-		int restart;
-
-		timer = list_entry(cpu_base->cb_pending.next,
-				   struct hrtimer, cb_entry);
-
-		debug_hrtimer_deactivate(timer);
-		timer_stats_account_hrtimer(timer);
-
-		fn = timer->function;
-		__remove_hrtimer(timer, timer->base, HRTIMER_STATE_CALLBACK, 0);
-		spin_unlock_irq(&cpu_base->lock);
-
-		restart = fn(timer);
-
-		spin_lock_irq(&cpu_base->lock);
-
-		timer->state &= ~HRTIMER_STATE_CALLBACK;
-		if (restart == HRTIMER_RESTART) {
-			BUG_ON(hrtimer_active(timer));
-			/*
-			 * Enqueue the timer, allow reprogramming of the event
-			 * device
-			 */
-			enqueue_hrtimer(timer, timer->base, 1);
-		} else if (hrtimer_active(timer)) {
-			/*
-			 * If the timer was rearmed on another CPU, reprogram
-			 * the event device.
-			 */
-			struct hrtimer_clock_base *base = timer->base;
-
-			if (base->first == &timer->node &&
-			    hrtimer_reprogram(timer, base)) {
-				/*
-				 * Timer is expired. Thus move it from tree to
-				 * pending list again.
-				 */
-				__remove_hrtimer(timer, base,
-						 HRTIMER_STATE_PENDING, 0);
-				list_add_tail(&timer->cb_entry,
-					      &base->cpu_base->cb_pending);
-			}
-		}
-	}
-	spin_unlock_irq(&cpu_base->lock);
-}
-
 static void __run_hrtimer(struct hrtimer *timer)
 {
 	struct hrtimer_clock_base *base = timer->base;
@@ -1241,25 +1141,21 @@ static void __run_hrtimer(struct hrtimer *timer)
 	enum hrtimer_restart (*fn)(struct hrtimer *);
 	int restart;
 
+	WARN_ON(!irqs_disabled());
+
 	debug_hrtimer_deactivate(timer);
 	__remove_hrtimer(timer, base, HRTIMER_STATE_CALLBACK, 0);
 	timer_stats_account_hrtimer(timer);
-
 	fn = timer->function;
-	if (timer->cb_mode == HRTIMER_CB_IRQSAFE_PERCPU ||
-	    timer->cb_mode == HRTIMER_CB_IRQSAFE_UNLOCKED) {
-		/*
-		 * Used for scheduler timers, avoid lock inversion with
-		 * rq->lock and tasklist_lock.
-		 *
-		 * These timers are required to deal with enqueue expiry
-		 * themselves and are not allowed to migrate.
-		 */
-		spin_unlock(&cpu_base->lock);
-		restart = fn(timer);
-		spin_lock(&cpu_base->lock);
-	} else
-		restart = fn(timer);
+
+	/*
+	 * Because we run timers from hardirq context, there is no chance
+	 * they get migrated to another cpu, therefore its safe to unlock
+	 * the timer base.
+	 */
+	spin_unlock(&cpu_base->lock);
+	restart = fn(timer);
+	spin_lock(&cpu_base->lock);
 
 	/*
 	 * Note: We clear the CALLBACK bit after enqueue_hrtimer to avoid
@@ -1284,7 +1180,7 @@ void hrtimer_interrupt(struct clock_event_device *dev)
 	struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
 	struct hrtimer_clock_base *base;
 	ktime_t expires_next, now;
-	int i, raise = 0;
+	int i;
 
 	BUG_ON(!cpu_base->hres_active);
 	cpu_base->nr_events++;
@@ -1310,26 +1206,29 @@ void hrtimer_interrupt(struct clock_event_device *dev)
 
 			timer = rb_entry(node, struct hrtimer, node);
 
-			if (basenow.tv64 < timer->expires.tv64) {
+			/*
+			 * The immediate goal for using the softexpires is
+			 * minimizing wakeups, not running timers at the
+			 * earliest interrupt after their soft expiration.
+			 * This allows us to avoid using a Priority Search
+			 * Tree, which can answer a stabbing querry for
+			 * overlapping intervals and instead use the simple
+			 * BST we already have.
+			 * We don't add extra wakeups by delaying timers that
+			 * are right-of a not yet expired timer, because that
+			 * timer will have to trigger a wakeup anyway.
+			 */
+
+			if (basenow.tv64 < hrtimer_get_softexpires_tv64(timer)) {
 				ktime_t expires;
 
-				expires = ktime_sub(timer->expires,
+				expires = ktime_sub(hrtimer_get_expires(timer),
 						    base->offset);
 				if (expires.tv64 < expires_next.tv64)
 					expires_next = expires;
 				break;
 			}
 
-			/* Move softirq callbacks to the pending list */
-			if (timer->cb_mode == HRTIMER_CB_SOFTIRQ) {
-				__remove_hrtimer(timer, base,
-						 HRTIMER_STATE_PENDING, 0);
-				list_add_tail(&timer->cb_entry,
-					      &base->cpu_base->cb_pending);
-				raise = 1;
-				continue;
-			}
-
 			__run_hrtimer(timer);
 		}
 		spin_unlock(&cpu_base->lock);
@@ -1343,15 +1242,30 @@ void hrtimer_interrupt(struct clock_event_device *dev)
 		if (tick_program_event(expires_next, 0))
 			goto retry;
 	}
-
-	/* Raise softirq ? */
-	if (raise)
-		raise_softirq(HRTIMER_SOFTIRQ);
 }
 
-static void run_hrtimer_softirq(struct softirq_action *h)
+/**
+ * hrtimer_peek_ahead_timers -- run soft-expired timers now
+ *
+ * hrtimer_peek_ahead_timers will peek at the timer queue of
+ * the current cpu and check if there are any timers for which
+ * the soft expires time has passed. If any such timers exist,
+ * they are run immediately and then removed from the timer queue.
+ *
+ */
+void hrtimer_peek_ahead_timers(void)
 {
-	run_hrtimer_pending(&__get_cpu_var(hrtimer_bases));
+	struct tick_device *td;
+	unsigned long flags;
+
+	if (!hrtimer_hres_active())
+		return;
+
+	local_irq_save(flags);
+	td = &__get_cpu_var(tick_cpu_device);
+	if (td && td->evtdev)
+		hrtimer_interrupt(td->evtdev);
+	local_irq_restore(flags);
 }
 
 #endif	/* CONFIG_HIGH_RES_TIMERS */
@@ -1365,8 +1279,6 @@ static void run_hrtimer_softirq(struct softirq_action *h)
  */
 void hrtimer_run_pending(void)
 {
-	struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
-
 	if (hrtimer_hres_active())
 		return;
 
@@ -1380,8 +1292,6 @@ void hrtimer_run_pending(void)
 	 */
 	if (tick_check_oneshot_change(!hrtimer_is_hres_enabled()))
 		hrtimer_switch_to_hres();
-
-	run_hrtimer_pending(cpu_base);
 }
 
 /*
@@ -1403,9 +1313,7 @@ void hrtimer_run_queues(void)
 		if (!base->first)
 			continue;
 
-		if (base->get_softirq_time)
-			base->softirq_time = base->get_softirq_time();
-		else if (gettime) {
+		if (gettime) {
 			hrtimer_get_softirq_time(cpu_base);
 			gettime = 0;
 		}
@@ -1416,17 +1324,10 @@ void hrtimer_run_queues(void)
 			struct hrtimer *timer;
 
 			timer = rb_entry(node, struct hrtimer, node);
-			if (base->softirq_time.tv64 <= timer->expires.tv64)
+			if (base->softirq_time.tv64 <=
+					hrtimer_get_expires_tv64(timer))
 				break;
 
-			if (timer->cb_mode == HRTIMER_CB_SOFTIRQ) {
-				__remove_hrtimer(timer, base,
-					HRTIMER_STATE_PENDING, 0);
-				list_add_tail(&timer->cb_entry,
-					&base->cpu_base->cb_pending);
-				continue;
-			}
-
 			__run_hrtimer(timer);
 		}
 		spin_unlock(&cpu_base->lock);
@@ -1453,9 +1354,6 @@ void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task)
 {
 	sl->timer.function = hrtimer_wakeup;
 	sl->task = task;
-#ifdef CONFIG_HIGH_RES_TIMERS
-	sl->timer.cb_mode = HRTIMER_CB_IRQSAFE_UNLOCKED;
-#endif
 }
 
 static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode)
@@ -1464,7 +1362,7 @@ static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mod
 
 	do {
 		set_current_state(TASK_INTERRUPTIBLE);
-		hrtimer_start(&t->timer, t->timer.expires, mode);
+		hrtimer_start_expires(&t->timer, mode);
 		if (!hrtimer_active(&t->timer))
 			t->task = NULL;
 
@@ -1486,7 +1384,7 @@ static int update_rmtp(struct hrtimer *timer, struct timespec __user *rmtp)
 	struct timespec rmt;
 	ktime_t rem;
 
-	rem = ktime_sub(timer->expires, timer->base->get_time());
+	rem = hrtimer_expires_remaining(timer);
 	if (rem.tv64 <= 0)
 		return 0;
 	rmt = ktime_to_timespec(rem);
@@ -1505,7 +1403,7 @@ long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
 
 	hrtimer_init_on_stack(&t.timer, restart->nanosleep.index,
 				HRTIMER_MODE_ABS);
-	t.timer.expires.tv64 = restart->nanosleep.expires;
+	hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires);
 
 	if (do_nanosleep(&t, HRTIMER_MODE_ABS))
 		goto out;
@@ -1530,9 +1428,14 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
 	struct restart_block *restart;
 	struct hrtimer_sleeper t;
 	int ret = 0;
+	unsigned long slack;
+
+	slack = current->timer_slack_ns;
+	if (rt_task(current))
+		slack = 0;
 
 	hrtimer_init_on_stack(&t.timer, clockid, mode);
-	t.timer.expires = timespec_to_ktime(*rqtp);
+	hrtimer_set_expires_range_ns(&t.timer, timespec_to_ktime(*rqtp), slack);
 	if (do_nanosleep(&t, mode))
 		goto out;
 
@@ -1552,7 +1455,7 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
 	restart->fn = hrtimer_nanosleep_restart;
 	restart->nanosleep.index = t.timer.base->index;
 	restart->nanosleep.rmtp = rmtp;
-	restart->nanosleep.expires = t.timer.expires.tv64;
+	restart->nanosleep.expires = hrtimer_get_expires_tv64(&t.timer);
 
 	ret = -ERESTART_RESTARTBLOCK;
 out:
@@ -1587,18 +1490,16 @@ static void __cpuinit init_hrtimers_cpu(int cpu)
 	for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++)
 		cpu_base->clock_base[i].cpu_base = cpu_base;
 
-	INIT_LIST_HEAD(&cpu_base->cb_pending);
 	hrtimer_init_hres(cpu_base);
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
 
-static int migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
-				struct hrtimer_clock_base *new_base, int dcpu)
+static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
+				struct hrtimer_clock_base *new_base)
 {
 	struct hrtimer *timer;
 	struct rb_node *node;
-	int raise = 0;
 
 	while ((node = rb_first(&old_base->active))) {
 		timer = rb_entry(node, struct hrtimer, node);
@@ -1606,18 +1507,6 @@ static int migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
 		debug_hrtimer_deactivate(timer);
 
 		/*
-		 * Should not happen. Per CPU timers should be
-		 * canceled _before_ the migration code is called
-		 */
-		if (timer->cb_mode == HRTIMER_CB_IRQSAFE_PERCPU) {
-			__remove_hrtimer(timer, old_base,
-					 HRTIMER_STATE_INACTIVE, 0);
-			WARN(1, "hrtimer (%p %p)active but cpu %d dead\n",
-			     timer, timer->function, dcpu);
-			continue;
-		}
-
-		/*
 		 * Mark it as STATE_MIGRATE not INACTIVE otherwise the
 		 * timer could be seen as !active and just vanish away
 		 * under us on another CPU
@@ -1625,111 +1514,83 @@ static int migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
 		__remove_hrtimer(timer, old_base, HRTIMER_STATE_MIGRATE, 0);
 		timer->base = new_base;
 		/*
-		 * Enqueue the timer. Allow reprogramming of the event device
+		 * Enqueue the timers on the new cpu, but do not reprogram 
+		 * the timer as that would enable a deadlock between
+		 * hrtimer_enqueue_reprogramm() running the timer and us still
+		 * holding a nested base lock.
+		 *
+		 * Instead we tickle the hrtimer interrupt after the migration
+		 * is done, which will run all expired timers and re-programm
+		 * the timer device.
 		 */
-		enqueue_hrtimer(timer, new_base, 1);
+		enqueue_hrtimer(timer, new_base, 0);
 
-#ifdef CONFIG_HIGH_RES_TIMERS
-		/*
-		 * Happens with high res enabled when the timer was
-		 * already expired and the callback mode is
-		 * HRTIMER_CB_IRQSAFE_UNLOCKED (hrtimer_sleeper). The
-		 * enqueue code does not move them to the soft irq
-		 * pending list for performance/latency reasons, but
-		 * in the migration state, we need to do that
-		 * otherwise we end up with a stale timer.
-		 */
-		if (timer->state == HRTIMER_STATE_MIGRATE) {
-			timer->state = HRTIMER_STATE_PENDING;
-			list_add_tail(&timer->cb_entry,
-				      &new_base->cpu_base->cb_pending);
-			raise = 1;
-		}
-#endif
 		/* Clear the migration state bit */
 		timer->state &= ~HRTIMER_STATE_MIGRATE;
 	}
-	return raise;
 }
 
-#ifdef CONFIG_HIGH_RES_TIMERS
-static int migrate_hrtimer_pending(struct hrtimer_cpu_base *old_base,
-				   struct hrtimer_cpu_base *new_base)
-{
-	struct hrtimer *timer;
-	int raise = 0;
-
-	while (!list_empty(&old_base->cb_pending)) {
-		timer = list_entry(old_base->cb_pending.next,
-				   struct hrtimer, cb_entry);
-
-		__remove_hrtimer(timer, timer->base, HRTIMER_STATE_PENDING, 0);
-		timer->base = &new_base->clock_base[timer->base->index];
-		list_add_tail(&timer->cb_entry, &new_base->cb_pending);
-		raise = 1;
-	}
-	return raise;
-}
-#else
-static int migrate_hrtimer_pending(struct hrtimer_cpu_base *old_base,
-				   struct hrtimer_cpu_base *new_base)
-{
-	return 0;
-}
-#endif
-
-static void migrate_hrtimers(int cpu)
+static int migrate_hrtimers(int scpu)
 {
 	struct hrtimer_cpu_base *old_base, *new_base;
-	int i, raise = 0;
+	int dcpu, i;
 
-	BUG_ON(cpu_online(cpu));
-	old_base = &per_cpu(hrtimer_bases, cpu);
+	BUG_ON(cpu_online(scpu));
+	old_base = &per_cpu(hrtimer_bases, scpu);
 	new_base = &get_cpu_var(hrtimer_bases);
 
-	tick_cancel_sched_timer(cpu);
+	dcpu = smp_processor_id();
 
-	local_irq_disable();
-	spin_lock(&new_base->lock);
+	tick_cancel_sched_timer(scpu);
+	/*
+	 * The caller is globally serialized and nobody else
+	 * takes two locks at once, deadlock is not possible.
+	 */
+	spin_lock_irq(&new_base->lock);
 	spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
 
 	for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
-		if (migrate_hrtimer_list(&old_base->clock_base[i],
-					 &new_base->clock_base[i], cpu))
-			raise = 1;
+		migrate_hrtimer_list(&old_base->clock_base[i],
+				     &new_base->clock_base[i]);
 	}
 
-	if (migrate_hrtimer_pending(old_base, new_base))
-		raise = 1;
-
 	spin_unlock(&old_base->lock);
-	spin_unlock(&new_base->lock);
-	local_irq_enable();
+	spin_unlock_irq(&new_base->lock);
 	put_cpu_var(hrtimer_bases);
 
-	if (raise)
-		hrtimer_raise_softirq();
+	return dcpu;
 }
+
+static void tickle_timers(void *arg)
+{
+	hrtimer_peek_ahead_timers();
+}
+
 #endif /* CONFIG_HOTPLUG_CPU */
 
 static int __cpuinit hrtimer_cpu_notify(struct notifier_block *self,
 					unsigned long action, void *hcpu)
 {
-	unsigned int cpu = (long)hcpu;
+	int scpu = (long)hcpu;
 
 	switch (action) {
 
 	case CPU_UP_PREPARE:
 	case CPU_UP_PREPARE_FROZEN:
-		init_hrtimers_cpu(cpu);
+		init_hrtimers_cpu(scpu);
 		break;
 
 #ifdef CONFIG_HOTPLUG_CPU
 	case CPU_DEAD:
 	case CPU_DEAD_FROZEN:
-		clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DEAD, &cpu);
-		migrate_hrtimers(cpu);
+	{
+		int dcpu;
+
+		clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DEAD, &scpu);
+		dcpu = migrate_hrtimers(scpu);
+		smp_call_function_single(dcpu, tickle_timers, NULL, 0);
 		break;
+	}
 #endif
 
 	default:
@@ -1748,8 +1609,105 @@ void __init hrtimers_init(void)
 	hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE,
 			  (void *)(long)smp_processor_id());
 	register_cpu_notifier(&hrtimers_nb);
-#ifdef CONFIG_HIGH_RES_TIMERS
-	open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq);
-#endif
 }
 
+/**
+ * schedule_hrtimeout_range - sleep until timeout
+ * @expires:	timeout value (ktime_t)
+ * @delta:	slack in expires timeout (ktime_t)
+ * @mode:	timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL
+ *
+ * Make the current task sleep until the given expiry time has
+ * elapsed. The routine will return immediately unless
+ * the current task state has been set (see set_current_state()).
+ *
+ * The @delta argument gives the kernel the freedom to schedule the
+ * actual wakeup to a time that is both power and performance friendly.
+ * The kernel give the normal best effort behavior for "@expires+@delta",
+ * but may decide to fire the timer earlier, but no earlier than @expires.
+ *
+ * You can set the task state as follows -
+ *
+ * %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to
+ * pass before the routine returns.
+ *
+ * %TASK_INTERRUPTIBLE - the routine may return early if a signal is
+ * delivered to the current task.
+ *
+ * The current task state is guaranteed to be TASK_RUNNING when this
+ * routine returns.
+ *
+ * Returns 0 when the timer has expired otherwise -EINTR
+ */
+int __sched schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
+			       const enum hrtimer_mode mode)
+{
+	struct hrtimer_sleeper t;
+
+	/*
+	 * Optimize when a zero timeout value is given. It does not
+	 * matter whether this is an absolute or a relative time.
+	 */
+	if (expires && !expires->tv64) {
+		__set_current_state(TASK_RUNNING);
+		return 0;
+	}
+
+	/*
+	 * A NULL parameter means "inifinte"
+	 */
+	if (!expires) {
+		schedule();
+		__set_current_state(TASK_RUNNING);
+		return -EINTR;
+	}
+
+	hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, mode);
+	hrtimer_set_expires_range_ns(&t.timer, *expires, delta);
+
+	hrtimer_init_sleeper(&t, current);
+
+	hrtimer_start_expires(&t.timer, mode);
+	if (!hrtimer_active(&t.timer))
+		t.task = NULL;
+
+	if (likely(t.task))
+		schedule();
+
+	hrtimer_cancel(&t.timer);
+	destroy_hrtimer_on_stack(&t.timer);
+
+	__set_current_state(TASK_RUNNING);
+
+	return !t.task ? 0 : -EINTR;
+}
+EXPORT_SYMBOL_GPL(schedule_hrtimeout_range);
+
+/**
+ * schedule_hrtimeout - sleep until timeout
+ * @expires:	timeout value (ktime_t)
+ * @mode:	timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL
+ *
+ * Make the current task sleep until the given expiry time has
+ * elapsed. The routine will return immediately unless
+ * the current task state has been set (see set_current_state()).
+ *
+ * You can set the task state as follows -
+ *
+ * %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to
+ * pass before the routine returns.
+ *
+ * %TASK_INTERRUPTIBLE - the routine may return early if a signal is
+ * delivered to the current task.
+ *
+ * The current task state is guaranteed to be TASK_RUNNING when this
+ * routine returns.
+ *
+ * Returns 0 when the timer has expired otherwise -EINTR
+ */
+int __sched schedule_hrtimeout(ktime_t *expires,
+			       const enum hrtimer_mode mode)
+{
+	return schedule_hrtimeout_range(expires, 0, mode);
+}
+EXPORT_SYMBOL_GPL(schedule_hrtimeout);
diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile
index 681c52dbfe22..4dd5b1edac98 100644
--- a/kernel/irq/Makefile
+++ b/kernel/irq/Makefile
@@ -3,3 +3,4 @@ obj-y := handle.o manage.o spurious.o resend.o chip.o devres.o
 obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
 obj-$(CONFIG_PROC_FS) += proc.o
 obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o
+obj-$(CONFIG_NUMA_MIGRATE_IRQ_DESC) += numa_migrate.o
diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
index 533068cfb607..650ce4102a63 100644
--- a/kernel/irq/autoprobe.c
+++ b/kernel/irq/autoprobe.c
@@ -30,16 +30,18 @@ static DEFINE_MUTEX(probing_active);
 unsigned long probe_irq_on(void)
 {
 	struct irq_desc *desc;
-	unsigned long mask;
-	unsigned int i;
+	unsigned long mask = 0;
+	unsigned int status;
+	int i;
 
 	mutex_lock(&probing_active);
 	/*
 	 * something may have generated an irq long ago and we want to
 	 * flush such a longstanding irq before considering it as spurious.
 	 */
-	for (i = NR_IRQS-1; i > 0; i--) {
-		desc = irq_desc + i;
+	for_each_irq_desc_reverse(i, desc) {
+		if (!desc)
+			continue;
 
 		spin_lock_irq(&desc->lock);
 		if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
@@ -68,8 +70,9 @@ unsigned long probe_irq_on(void)
 	 * (we must startup again here because if a longstanding irq
 	 * happened in the previous stage, it may have masked itself)
 	 */
-	for (i = NR_IRQS-1; i > 0; i--) {
-		desc = irq_desc + i;
+	for_each_irq_desc_reverse(i, desc) {
+		if (!desc)
+			continue;
 
 		spin_lock_irq(&desc->lock);
 		if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
@@ -88,11 +91,10 @@ unsigned long probe_irq_on(void)
 	/*
 	 * Now filter out any obviously spurious interrupts
 	 */
-	mask = 0;
-	for (i = 0; i < NR_IRQS; i++) {
-		unsigned int status;
+	for_each_irq_desc(i, desc) {
+		if (!desc)
+			continue;
 
-		desc = irq_desc + i;
 		spin_lock_irq(&desc->lock);
 		status = desc->status;
 
@@ -126,13 +128,13 @@ EXPORT_SYMBOL(probe_irq_on);
  */
 unsigned int probe_irq_mask(unsigned long val)
 {
-	unsigned int mask;
+	unsigned int status, mask = 0;
+	struct irq_desc *desc;
 	int i;
 
-	mask = 0;
-	for (i = 0; i < NR_IRQS; i++) {
-		struct irq_desc *desc = irq_desc + i;
-		unsigned int status;
+	for_each_irq_desc(i, desc) {
+		if (!desc)
+			continue;
 
 		spin_lock_irq(&desc->lock);
 		status = desc->status;
@@ -171,20 +173,22 @@ EXPORT_SYMBOL(probe_irq_mask);
  */
 int probe_irq_off(unsigned long val)
 {
-	int i, irq_found = 0, nr_irqs = 0;
+	int i, irq_found = 0, nr_of_irqs = 0;
+	struct irq_desc *desc;
+	unsigned int status;
 
-	for (i = 0; i < NR_IRQS; i++) {
-		struct irq_desc *desc = irq_desc + i;
-		unsigned int status;
+	for_each_irq_desc(i, desc) {
+		if (!desc)
+			continue;
 
 		spin_lock_irq(&desc->lock);
 		status = desc->status;
 
 		if (status & IRQ_AUTODETECT) {
 			if (!(status & IRQ_WAITING)) {
-				if (!nr_irqs)
+				if (!nr_of_irqs)
 					irq_found = i;
-				nr_irqs++;
+				nr_of_irqs++;
 			}
 			desc->status = status & ~IRQ_AUTODETECT;
 			desc->chip->shutdown(i);
@@ -193,7 +197,7 @@ int probe_irq_off(unsigned long val)
 	}
 	mutex_unlock(&probing_active);
 
-	if (nr_irqs > 1)
+	if (nr_of_irqs > 1)
 		irq_found = -irq_found;
 
 	return irq_found;
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 3cd441ebf5d2..6eb3c7952b64 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -27,13 +27,13 @@ void dynamic_irq_init(unsigned int irq)
 	struct irq_desc *desc;
 	unsigned long flags;
 
-	if (irq >= NR_IRQS) {
+	desc = irq_to_desc(irq);
+	if (!desc) {
 		WARN(1, KERN_ERR "Trying to initialize invalid IRQ%d\n", irq);
 		return;
 	}
 
 	/* Ensure we don't have left over values from a previous use of this irq */
-	desc = irq_desc + irq;
 	spin_lock_irqsave(&desc->lock, flags);
 	desc->status = IRQ_DISABLED;
 	desc->chip = &no_irq_chip;
@@ -57,15 +57,14 @@ void dynamic_irq_init(unsigned int irq)
  */
 void dynamic_irq_cleanup(unsigned int irq)
 {
-	struct irq_desc *desc;
+	struct irq_desc *desc = irq_to_desc(irq);
 	unsigned long flags;
 
-	if (irq >= NR_IRQS) {
+	if (!desc) {
 		WARN(1, KERN_ERR "Trying to cleanup invalid IRQ%d\n", irq);
 		return;
 	}
 
-	desc = irq_desc + irq;
 	spin_lock_irqsave(&desc->lock, flags);
 	if (desc->action) {
 		spin_unlock_irqrestore(&desc->lock, flags);
@@ -78,6 +77,7 @@ void dynamic_irq_cleanup(unsigned int irq)
 	desc->chip_data = NULL;
 	desc->handle_irq = handle_bad_irq;
 	desc->chip = &no_irq_chip;
+	desc->name = NULL;
 	spin_unlock_irqrestore(&desc->lock, flags);
 }
 
@@ -89,10 +89,10 @@ void dynamic_irq_cleanup(unsigned int irq)
  */
 int set_irq_chip(unsigned int irq, struct irq_chip *chip)
 {
-	struct irq_desc *desc;
+	struct irq_desc *desc = irq_to_desc(irq);
 	unsigned long flags;
 
-	if (irq >= NR_IRQS) {
+	if (!desc) {
 		WARN(1, KERN_ERR "Trying to install chip for IRQ%d\n", irq);
 		return -EINVAL;
 	}
@@ -100,7 +100,6 @@ int set_irq_chip(unsigned int irq, struct irq_chip *chip)
 	if (!chip)
 		chip = &no_irq_chip;
 
-	desc = irq_desc + irq;
 	spin_lock_irqsave(&desc->lock, flags);
 	irq_chip_set_defaults(chip);
 	desc->chip = chip;
@@ -111,27 +110,28 @@ int set_irq_chip(unsigned int irq, struct irq_chip *chip)
 EXPORT_SYMBOL(set_irq_chip);
 
 /**
- *	set_irq_type - set the irq type for an irq
+ *	set_irq_type - set the irq trigger type for an irq
  *	@irq:	irq number
- *	@type:	interrupt type - see include/linux/interrupt.h
+ *	@type:	IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
  */
 int set_irq_type(unsigned int irq, unsigned int type)
 {
-	struct irq_desc *desc;
+	struct irq_desc *desc = irq_to_desc(irq);
 	unsigned long flags;
 	int ret = -ENXIO;
 
-	if (irq >= NR_IRQS) {
+	if (!desc) {
 		printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq);
 		return -ENODEV;
 	}
 
-	desc = irq_desc + irq;
-	if (desc->chip->set_type) {
-		spin_lock_irqsave(&desc->lock, flags);
-		ret = desc->chip->set_type(irq, type);
-		spin_unlock_irqrestore(&desc->lock, flags);
-	}
+	type &= IRQ_TYPE_SENSE_MASK;
+	if (type == IRQ_TYPE_NONE)
+		return 0;
+
+	spin_lock_irqsave(&desc->lock, flags);
+	ret = __irq_set_trigger(desc, irq, type);
+	spin_unlock_irqrestore(&desc->lock, flags);
 	return ret;
 }
 EXPORT_SYMBOL(set_irq_type);
@@ -145,16 +145,15 @@ EXPORT_SYMBOL(set_irq_type);
  */
 int set_irq_data(unsigned int irq, void *data)
 {
-	struct irq_desc *desc;
+	struct irq_desc *desc = irq_to_desc(irq);
 	unsigned long flags;
 
-	if (irq >= NR_IRQS) {
+	if (!desc) {
 		printk(KERN_ERR
 		       "Trying to install controller data for IRQ%d\n", irq);
 		return -EINVAL;
 	}
 
-	desc = irq_desc + irq;
 	spin_lock_irqsave(&desc->lock, flags);
 	desc->handler_data = data;
 	spin_unlock_irqrestore(&desc->lock, flags);
@@ -171,15 +170,15 @@ EXPORT_SYMBOL(set_irq_data);
  */
 int set_irq_msi(unsigned int irq, struct msi_desc *entry)
 {
-	struct irq_desc *desc;
+	struct irq_desc *desc = irq_to_desc(irq);
 	unsigned long flags;
 
-	if (irq >= NR_IRQS) {
+	if (!desc) {
 		printk(KERN_ERR
 		       "Trying to install msi data for IRQ%d\n", irq);
 		return -EINVAL;
 	}
-	desc = irq_desc + irq;
+
 	spin_lock_irqsave(&desc->lock, flags);
 	desc->msi_desc = entry;
 	if (entry)
@@ -197,10 +196,16 @@ int set_irq_msi(unsigned int irq, struct msi_desc *entry)
  */
 int set_irq_chip_data(unsigned int irq, void *data)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 	unsigned long flags;
 
-	if (irq >= NR_IRQS || !desc->chip) {
+	if (!desc) {
+		printk(KERN_ERR
+		       "Trying to install chip data for IRQ%d\n", irq);
+		return -EINVAL;
+	}
+
+	if (!desc->chip) {
 		printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq);
 		return -EINVAL;
 	}
@@ -218,7 +223,7 @@ EXPORT_SYMBOL(set_irq_chip_data);
  */
 static void default_enable(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 
 	desc->chip->unmask(irq);
 	desc->status &= ~IRQ_MASKED;
@@ -236,8 +241,9 @@ static void default_disable(unsigned int irq)
  */
 static unsigned int default_startup(unsigned int irq)
 {
-	irq_desc[irq].chip->enable(irq);
+	struct irq_desc *desc = irq_to_desc(irq);
 
+	desc->chip->enable(irq);
 	return 0;
 }
 
@@ -246,7 +252,7 @@ static unsigned int default_startup(unsigned int irq)
  */
 static void default_shutdown(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 
 	desc->chip->mask(irq);
 	desc->status |= IRQ_MASKED;
@@ -305,14 +311,13 @@ handle_simple_irq(unsigned int irq, struct irq_desc *desc)
 {
 	struct irqaction *action;
 	irqreturn_t action_ret;
-	const unsigned int cpu = smp_processor_id();
 
 	spin_lock(&desc->lock);
 
 	if (unlikely(desc->status & IRQ_INPROGRESS))
 		goto out_unlock;
 	desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
-	kstat_cpu(cpu).irqs[irq]++;
+	kstat_incr_irqs_this_cpu(irq, desc);
 
 	action = desc->action;
 	if (unlikely(!action || (desc->status & IRQ_DISABLED)))
@@ -344,17 +349,17 @@ out_unlock:
 void
 handle_level_irq(unsigned int irq, struct irq_desc *desc)
 {
-	unsigned int cpu = smp_processor_id();
 	struct irqaction *action;
 	irqreturn_t action_ret;
 
 	spin_lock(&desc->lock);
 	mask_ack_irq(desc, irq);
+	desc = irq_remap_to_desc(irq, desc);
 
 	if (unlikely(desc->status & IRQ_INPROGRESS))
 		goto out_unlock;
 	desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
-	kstat_cpu(cpu).irqs[irq]++;
+	kstat_incr_irqs_this_cpu(irq, desc);
 
 	/*
 	 * If its disabled or no action available
@@ -392,7 +397,6 @@ out_unlock:
 void
 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 {
-	unsigned int cpu = smp_processor_id();
 	struct irqaction *action;
 	irqreturn_t action_ret;
 
@@ -402,7 +406,7 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 		goto out;
 
 	desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
-	kstat_cpu(cpu).irqs[irq]++;
+	kstat_incr_irqs_this_cpu(irq, desc);
 
 	/*
 	 * If its disabled or no action available
@@ -428,6 +432,7 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
 	desc->status &= ~IRQ_INPROGRESS;
 out:
 	desc->chip->eoi(irq);
+	desc = irq_remap_to_desc(irq, desc);
 
 	spin_unlock(&desc->lock);
 }
@@ -451,8 +456,6 @@ out:
 void
 handle_edge_irq(unsigned int irq, struct irq_desc *desc)
 {
-	const unsigned int cpu = smp_processor_id();
-
 	spin_lock(&desc->lock);
 
 	desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
@@ -466,13 +469,14 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
 		    !desc->action)) {
 		desc->status |= (IRQ_PENDING | IRQ_MASKED);
 		mask_ack_irq(desc, irq);
+		desc = irq_remap_to_desc(irq, desc);
 		goto out_unlock;
 	}
-
-	kstat_cpu(cpu).irqs[irq]++;
+	kstat_incr_irqs_this_cpu(irq, desc);
 
 	/* Start handling the irq */
 	desc->chip->ack(irq);
+	desc = irq_remap_to_desc(irq, desc);
 
 	/* Mark the IRQ currently in progress.*/
 	desc->status |= IRQ_INPROGRESS;
@@ -524,7 +528,7 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
 {
 	irqreturn_t action_ret;
 
-	kstat_this_cpu.irqs[irq]++;
+	kstat_incr_irqs_this_cpu(irq, desc);
 
 	if (desc->chip->ack)
 		desc->chip->ack(irq);
@@ -533,25 +537,25 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
 	if (!noirqdebug)
 		note_interrupt(irq, desc, action_ret);
 
-	if (desc->chip->eoi)
+	if (desc->chip->eoi) {
 		desc->chip->eoi(irq);
+		desc = irq_remap_to_desc(irq, desc);
+	}
 }
 
 void
 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 		  const char *name)
 {
-	struct irq_desc *desc;
+	struct irq_desc *desc = irq_to_desc(irq);
 	unsigned long flags;
 
-	if (irq >= NR_IRQS) {
+	if (!desc) {
 		printk(KERN_ERR
 		       "Trying to install type control for IRQ%d\n", irq);
 		return;
 	}
 
-	desc = irq_desc + irq;
-
 	if (!handle)
 		handle = handle_bad_irq;
 	else if (desc->chip == &no_irq_chip) {
@@ -571,8 +575,10 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 
 	/* Uninstall? */
 	if (handle == handle_bad_irq) {
-		if (desc->chip != &no_irq_chip)
+		if (desc->chip != &no_irq_chip) {
 			mask_ack_irq(desc, irq);
+			desc = irq_remap_to_desc(irq, desc);
+		}
 		desc->status |= IRQ_DISABLED;
 		desc->depth = 1;
 	}
@@ -583,7 +589,7 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 		desc->status &= ~IRQ_DISABLED;
 		desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE;
 		desc->depth = 0;
-		desc->chip->unmask(irq);
+		desc->chip->startup(irq);
 	}
 	spin_unlock_irqrestore(&desc->lock, flags);
 }
@@ -606,17 +612,14 @@ set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 
 void __init set_irq_noprobe(unsigned int irq)
 {
-	struct irq_desc *desc;
+	struct irq_desc *desc = irq_to_desc(irq);
 	unsigned long flags;
 
-	if (irq >= NR_IRQS) {
+	if (!desc) {
 		printk(KERN_ERR "Trying to mark IRQ%d non-probeable\n", irq);
-
 		return;
 	}
 
-	desc = irq_desc + irq;
-
 	spin_lock_irqsave(&desc->lock, flags);
 	desc->status |= IRQ_NOPROBE;
 	spin_unlock_irqrestore(&desc->lock, flags);
@@ -624,17 +627,14 @@ void __init set_irq_noprobe(unsigned int irq)
 
 void __init set_irq_probe(unsigned int irq)
 {
-	struct irq_desc *desc;
+	struct irq_desc *desc = irq_to_desc(irq);
 	unsigned long flags;
 
-	if (irq >= NR_IRQS) {
+	if (!desc) {
 		printk(KERN_ERR "Trying to mark IRQ%d probeable\n", irq);
-
 		return;
 	}
 
-	desc = irq_desc + irq;
-
 	spin_lock_irqsave(&desc->lock, flags);
 	desc->status &= ~IRQ_NOPROBE;
 	spin_unlock_irqrestore(&desc->lock, flags);
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 5fa6198e9139..6492400cb50d 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -15,9 +15,16 @@
 #include <linux/random.h>
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>
+#include <linux/rculist.h>
+#include <linux/hash.h>
 
 #include "internals.h"
 
+/*
+ * lockdep: we want to handle all irq_desc locks as a single lock-class:
+ */
+struct lock_class_key irq_desc_lock_class;
+
 /**
  * handle_bad_irq - handle spurious and unhandled irqs
  * @irq:       the interrupt number
@@ -25,11 +32,10 @@
  *
  * Handles spurious and unhandled IRQ's. It also prints a debugmessage.
  */
-void
-handle_bad_irq(unsigned int irq, struct irq_desc *desc)
+void handle_bad_irq(unsigned int irq, struct irq_desc *desc)
 {
 	print_irq_desc(irq, desc);
-	kstat_this_cpu.irqs[irq]++;
+	kstat_incr_irqs_this_cpu(irq, desc);
 	ack_bad_irq(irq);
 }
 
@@ -47,6 +53,158 @@ handle_bad_irq(unsigned int irq, struct irq_desc *desc)
  *
  * Controller mappings for all interrupt sources:
  */
+int nr_irqs = NR_IRQS;
+EXPORT_SYMBOL_GPL(nr_irqs);
+
+void __init __attribute__((weak)) arch_early_irq_init(void)
+{
+}
+
+#ifdef CONFIG_SPARSE_IRQ
+static struct irq_desc irq_desc_init = {
+	.irq	    = -1,
+	.status	    = IRQ_DISABLED,
+	.chip	    = &no_irq_chip,
+	.handle_irq = handle_bad_irq,
+	.depth      = 1,
+	.lock       = __SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
+#ifdef CONFIG_SMP
+	.affinity   = CPU_MASK_ALL
+#endif
+};
+
+void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr)
+{
+	unsigned long bytes;
+	char *ptr;
+	int node;
+
+	/* Compute how many bytes we need per irq and allocate them */
+	bytes = nr * sizeof(unsigned int);
+
+	node = cpu_to_node(cpu);
+	ptr = kzalloc_node(bytes, GFP_ATOMIC, node);
+	printk(KERN_DEBUG "  alloc kstat_irqs on cpu %d node %d\n", cpu, node);
+
+	if (ptr)
+		desc->kstat_irqs = (unsigned int *)ptr;
+}
+
+void __attribute__((weak)) arch_init_chip_data(struct irq_desc *desc, int cpu)
+{
+}
+
+static void init_one_irq_desc(int irq, struct irq_desc *desc, int cpu)
+{
+	memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
+	desc->irq = irq;
+#ifdef CONFIG_SMP
+	desc->cpu = cpu;
+#endif
+	lockdep_set_class(&desc->lock, &irq_desc_lock_class);
+	init_kstat_irqs(desc, cpu, nr_cpu_ids);
+	if (!desc->kstat_irqs) {
+		printk(KERN_ERR "can not alloc kstat_irqs\n");
+		BUG_ON(1);
+	}
+	arch_init_chip_data(desc, cpu);
+}
+
+/*
+ * Protect the sparse_irqs:
+ */
+DEFINE_SPINLOCK(sparse_irq_lock);
+
+struct irq_desc *irq_desc_ptrs[NR_IRQS] __read_mostly;
+
+static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = {
+	[0 ... NR_IRQS_LEGACY-1] = {
+		.irq	    = -1,
+		.status	    = IRQ_DISABLED,
+		.chip	    = &no_irq_chip,
+		.handle_irq = handle_bad_irq,
+		.depth	    = 1,
+		.lock	    = __SPIN_LOCK_UNLOCKED(irq_desc_init.lock),
+#ifdef CONFIG_SMP
+		.affinity   = CPU_MASK_ALL
+#endif
+	}
+};
+
+/* FIXME: use bootmem alloc ...*/
+static unsigned int kstat_irqs_legacy[NR_IRQS_LEGACY][NR_CPUS];
+
+void __init early_irq_init(void)
+{
+	struct irq_desc *desc;
+	int legacy_count;
+	int i;
+
+	desc = irq_desc_legacy;
+	legacy_count = ARRAY_SIZE(irq_desc_legacy);
+
+	for (i = 0; i < legacy_count; i++) {
+		desc[i].irq = i;
+		desc[i].kstat_irqs = kstat_irqs_legacy[i];
+
+		irq_desc_ptrs[i] = desc + i;
+	}
+
+	for (i = legacy_count; i < NR_IRQS; i++)
+		irq_desc_ptrs[i] = NULL;
+
+	arch_early_irq_init();
+}
+
+struct irq_desc *irq_to_desc(unsigned int irq)
+{
+	return (irq < NR_IRQS) ? irq_desc_ptrs[irq] : NULL;
+}
+
+struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
+{
+	struct irq_desc *desc;
+	unsigned long flags;
+	int node;
+
+	if (irq >= NR_IRQS) {
+		printk(KERN_WARNING "irq >= NR_IRQS in irq_to_desc_alloc: %d %d\n",
+				irq, NR_IRQS);
+		WARN_ON(1);
+		return NULL;
+	}
+
+	desc = irq_desc_ptrs[irq];
+	if (desc)
+		return desc;
+
+	spin_lock_irqsave(&sparse_irq_lock, flags);
+
+	/* We have to check it to avoid races with another CPU */
+	desc = irq_desc_ptrs[irq];
+	if (desc)
+		goto out_unlock;
+
+	node = cpu_to_node(cpu);
+	desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
+	printk(KERN_DEBUG "  alloc irq_desc for %d on cpu %d node %d\n",
+		 irq, cpu, node);
+	if (!desc) {
+		printk(KERN_ERR "can not alloc irq_desc\n");
+		BUG_ON(1);
+	}
+	init_one_irq_desc(irq, desc, cpu);
+
+	irq_desc_ptrs[irq] = desc;
+
+out_unlock:
+	spin_unlock_irqrestore(&sparse_irq_lock, flags);
+
+	return desc;
+}
+
+#else
+
 struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
 	[0 ... NR_IRQS-1] = {
 		.status = IRQ_DISABLED,
@@ -60,13 +218,17 @@ struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
 	}
 };
 
+#endif
+
 /*
  * What should we do if we get a hw irq event on an illegal vector?
  * Each architecture has to answer this themself.
  */
 static void ack_bad(unsigned int irq)
 {
-	print_irq_desc(irq, irq_desc + irq);
+	struct irq_desc *desc = irq_to_desc(irq);
+
+	print_irq_desc(irq, desc);
 	ack_bad_irq(irq);
 }
 
@@ -131,8 +293,6 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
 	irqreturn_t ret, retval = IRQ_NONE;
 	unsigned int status = 0;
 
-	handle_dynamic_tick(action);
-
 	if (!(action->flags & IRQF_DISABLED))
 		local_irq_enable_in_hardirq();
 
@@ -165,19 +325,23 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
  */
 unsigned int __do_IRQ(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 	struct irqaction *action;
 	unsigned int status;
 
-	kstat_this_cpu.irqs[irq]++;
+	kstat_incr_irqs_this_cpu(irq, desc);
+
 	if (CHECK_IRQ_PER_CPU(desc->status)) {
 		irqreturn_t action_ret;
 
 		/*
 		 * No locking required for CPU-local interrupts:
 		 */
-		if (desc->chip->ack)
+		if (desc->chip->ack) {
 			desc->chip->ack(irq);
+			/* get new one */
+			desc = irq_remap_to_desc(irq, desc);
+		}
 		if (likely(!(desc->status & IRQ_DISABLED))) {
 			action_ret = handle_IRQ_event(irq, desc->action);
 			if (!noirqdebug)
@@ -188,8 +352,10 @@ unsigned int __do_IRQ(unsigned int irq)
 	}
 
 	spin_lock(&desc->lock);
-	if (desc->chip->ack)
+	if (desc->chip->ack) {
 		desc->chip->ack(irq);
+		desc = irq_remap_to_desc(irq, desc);
+	}
 	/*
 	 * REPLAY is when Linux resends an IRQ that was dropped earlier
 	 * WAITING is used by probe to mark irqs that are being tested
@@ -256,19 +422,25 @@ out:
 }
 #endif
 
-#ifdef CONFIG_TRACE_IRQFLAGS
-
-/*
- * lockdep: we want to handle all irq_desc locks as a single lock-class:
- */
-static struct lock_class_key irq_desc_lock_class;
-
 void early_init_irq_lock_class(void)
 {
+	struct irq_desc *desc;
 	int i;
 
-	for (i = 0; i < NR_IRQS; i++)
-		lockdep_set_class(&irq_desc[i].lock, &irq_desc_lock_class);
+	for_each_irq_desc(i, desc) {
+		if (!desc)
+			continue;
+
+		lockdep_set_class(&desc->lock, &irq_desc_lock_class);
+	}
 }
 
+#ifdef CONFIG_SPARSE_IRQ
+unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
+{
+	struct irq_desc *desc = irq_to_desc(irq);
+	return desc->kstat_irqs[cpu];
+}
 #endif
+EXPORT_SYMBOL(kstat_irqs_cpu);
+
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 08a849a22447..e6d0a43cc125 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -10,18 +10,28 @@ extern void irq_chip_set_defaults(struct irq_chip *chip);
 /* Set default handler: */
 extern void compat_irq_chip_set_default_handler(struct irq_desc *desc);
 
+extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
+		unsigned long flags);
+
+extern struct lock_class_key irq_desc_lock_class;
+extern void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr);
+extern spinlock_t sparse_irq_lock;
+extern struct irq_desc *irq_desc_ptrs[NR_IRQS];
+
 #ifdef CONFIG_PROC_FS
-extern void register_irq_proc(unsigned int irq);
+extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
 #else
-static inline void register_irq_proc(unsigned int irq) { }
+static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
 static inline void register_handler_proc(unsigned int irq,
 					 struct irqaction *action) { }
 static inline void unregister_handler_proc(unsigned int irq,
 					   struct irqaction *action) { }
 #endif
 
+extern int irq_select_affinity_usr(unsigned int irq);
+
 /*
  * Debugging printout:
  */
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 60c49e324390..540f6c49f3fa 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -31,10 +31,10 @@ cpumask_t irq_default_affinity = CPU_MASK_ALL;
  */
 void synchronize_irq(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 	unsigned int status;
 
-	if (irq >= NR_IRQS)
+	if (!desc)
 		return;
 
 	do {
@@ -64,7 +64,7 @@ EXPORT_SYMBOL(synchronize_irq);
  */
 int irq_can_set_affinity(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 
 	if (CHECK_IRQ_PER_CPU(desc->status) || !desc->chip ||
 	    !desc->chip->set_affinity)
@@ -81,26 +81,28 @@ int irq_can_set_affinity(unsigned int irq)
  */
 int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
+	unsigned long flags;
 
 	if (!desc->chip->set_affinity)
 		return -EINVAL;
 
-	set_balance_irq_affinity(irq, cpumask);
+	spin_lock_irqsave(&desc->lock, flags);
 
 #ifdef CONFIG_GENERIC_PENDING_IRQ
-	if (desc->status & IRQ_MOVE_PCNTXT) {
-		unsigned long flags;
-
-		spin_lock_irqsave(&desc->lock, flags);
+	if (desc->status & IRQ_MOVE_PCNTXT || desc->status & IRQ_DISABLED) {
+		desc->affinity = cpumask;
 		desc->chip->set_affinity(irq, cpumask);
-		spin_unlock_irqrestore(&desc->lock, flags);
-	} else
-		set_pending_irq(irq, cpumask);
+	} else {
+		desc->status |= IRQ_MOVE_PENDING;
+		desc->pending_mask = cpumask;
+	}
 #else
 	desc->affinity = cpumask;
 	desc->chip->set_affinity(irq, cpumask);
 #endif
+	desc->status |= IRQ_AFFINITY_SET;
+	spin_unlock_irqrestore(&desc->lock, flags);
 	return 0;
 }
 
@@ -108,7 +110,7 @@ int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
 /*
  * Generic version of the affinity autoselector.
  */
-int irq_select_affinity(unsigned int irq)
+int do_irq_select_affinity(unsigned int irq, struct irq_desc *desc)
 {
 	cpumask_t mask;
 
@@ -117,14 +119,50 @@ int irq_select_affinity(unsigned int irq)
 
 	cpus_and(mask, cpu_online_map, irq_default_affinity);
 
-	irq_desc[irq].affinity = mask;
-	irq_desc[irq].chip->set_affinity(irq, mask);
+	/*
+	 * Preserve an userspace affinity setup, but make sure that
+	 * one of the targets is online.
+	 */
+	if (desc->status & (IRQ_AFFINITY_SET | IRQ_NO_BALANCING)) {
+		if (cpus_intersects(desc->affinity, cpu_online_map))
+			mask = desc->affinity;
+		else
+			desc->status &= ~IRQ_AFFINITY_SET;
+	}
+
+	desc->affinity = mask;
+	desc->chip->set_affinity(irq, mask);
 
-	set_balance_irq_affinity(irq, mask);
 	return 0;
 }
+#else
+static inline int do_irq_select_affinity(unsigned int irq, struct irq_desc *d)
+{
+	return irq_select_affinity(irq);
+}
 #endif
 
+/*
+ * Called when affinity is set via /proc/irq
+ */
+int irq_select_affinity_usr(unsigned int irq)
+{
+	struct irq_desc *desc = irq_to_desc(irq);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&desc->lock, flags);
+	ret = do_irq_select_affinity(irq, desc);
+	spin_unlock_irqrestore(&desc->lock, flags);
+
+	return ret;
+}
+
+#else
+static inline int do_irq_select_affinity(int irq, struct irq_desc *desc)
+{
+	return 0;
+}
 #endif
 
 /**
@@ -140,10 +178,10 @@ int irq_select_affinity(unsigned int irq)
  */
 void disable_irq_nosync(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 	unsigned long flags;
 
-	if (irq >= NR_IRQS)
+	if (!desc)
 		return;
 
 	spin_lock_irqsave(&desc->lock, flags);
@@ -169,9 +207,9 @@ EXPORT_SYMBOL(disable_irq_nosync);
  */
 void disable_irq(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 
-	if (irq >= NR_IRQS)
+	if (!desc)
 		return;
 
 	disable_irq_nosync(irq);
@@ -211,10 +249,10 @@ static void __enable_irq(struct irq_desc *desc, unsigned int irq)
  */
 void enable_irq(unsigned int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 	unsigned long flags;
 
-	if (irq >= NR_IRQS)
+	if (!desc)
 		return;
 
 	spin_lock_irqsave(&desc->lock, flags);
@@ -223,9 +261,9 @@ void enable_irq(unsigned int irq)
 }
 EXPORT_SYMBOL(enable_irq);
 
-int set_irq_wake_real(unsigned int irq, unsigned int on)
+static int set_irq_wake_real(unsigned int irq, unsigned int on)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 	int ret = -ENXIO;
 
 	if (desc->chip->set_wake)
@@ -248,7 +286,7 @@ int set_irq_wake_real(unsigned int irq, unsigned int on)
  */
 int set_irq_wake(unsigned int irq, unsigned int on)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 	unsigned long flags;
 	int ret = 0;
 
@@ -288,12 +326,16 @@ EXPORT_SYMBOL(set_irq_wake);
  */
 int can_request_irq(unsigned int irq, unsigned long irqflags)
 {
+	struct irq_desc *desc = irq_to_desc(irq);
 	struct irqaction *action;
 
-	if (irq >= NR_IRQS || irq_desc[irq].status & IRQ_NOREQUEST)
+	if (!desc)
+		return 0;
+
+	if (desc->status & IRQ_NOREQUEST)
 		return 0;
 
-	action = irq_desc[irq].action;
+	action = desc->action;
 	if (action)
 		if (irqflags & action->flags & IRQF_SHARED)
 			action = NULL;
@@ -312,27 +354,35 @@ void compat_irq_chip_set_default_handler(struct irq_desc *desc)
 		desc->handle_irq = NULL;
 }
 
-static int __irq_set_trigger(struct irq_chip *chip, unsigned int irq,
+int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
 		unsigned long flags)
 {
 	int ret;
+	struct irq_chip *chip = desc->chip;
 
 	if (!chip || !chip->set_type) {
 		/*
 		 * IRQF_TRIGGER_* but the PIC does not support multiple
 		 * flow-types?
 		 */
-		pr_warning("No set_type function for IRQ %d (%s)\n", irq,
+		pr_debug("No set_type function for IRQ %d (%s)\n", irq,
 				chip ? (chip->name ? : "unknown") : "unknown");
 		return 0;
 	}
 
-	ret = chip->set_type(irq, flags & IRQF_TRIGGER_MASK);
+	/* caller masked out all except trigger mode flags */
+	ret = chip->set_type(irq, flags);
 
 	if (ret)
 		pr_err("setting trigger mode %d for irq %u failed (%pF)\n",
-				(int)(flags & IRQF_TRIGGER_MASK),
-				irq, chip->set_type);
+				(int)flags, irq, chip->set_type);
+	else {
+		if (flags & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
+			flags |= IRQ_LEVEL;
+		/* note that IRQF_TRIGGER_MASK == IRQ_TYPE_SENSE_MASK */
+		desc->status &= ~(IRQ_LEVEL | IRQ_TYPE_SENSE_MASK);
+		desc->status |= flags;
+	}
 
 	return ret;
 }
@@ -341,16 +391,16 @@ static int __irq_set_trigger(struct irq_chip *chip, unsigned int irq,
  * Internal function to register an irqaction - typically used to
  * allocate special interrupts that are part of the architecture.
  */
-int setup_irq(unsigned int irq, struct irqaction *new)
+static int
+__setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
 {
-	struct irq_desc *desc = irq_desc + irq;
 	struct irqaction *old, **p;
 	const char *old_name = NULL;
 	unsigned long flags;
 	int shared = 0;
 	int ret;
 
-	if (irq >= NR_IRQS)
+	if (!desc)
 		return -EINVAL;
 
 	if (desc->chip == &no_irq_chip)
@@ -411,7 +461,8 @@ int setup_irq(unsigned int irq, struct irqaction *new)
 
 		/* Setup the type (level, edge polarity) if configured: */
 		if (new->flags & IRQF_TRIGGER_MASK) {
-			ret = __irq_set_trigger(desc->chip, irq, new->flags);
+			ret = __irq_set_trigger(desc, irq,
+					new->flags & IRQF_TRIGGER_MASK);
 
 			if (ret) {
 				spin_unlock_irqrestore(&desc->lock, flags);
@@ -430,24 +481,29 @@ int setup_irq(unsigned int irq, struct irqaction *new)
 		if (!(desc->status & IRQ_NOAUTOEN)) {
 			desc->depth = 0;
 			desc->status &= ~IRQ_DISABLED;
-			if (desc->chip->startup)
-				desc->chip->startup(irq);
-			else
-				desc->chip->enable(irq);
+			desc->chip->startup(irq);
 		} else
 			/* Undo nested disables: */
 			desc->depth = 1;
 
+		/* Exclude IRQ from balancing if requested */
+		if (new->flags & IRQF_NOBALANCING)
+			desc->status |= IRQ_NO_BALANCING;
+
 		/* Set default affinity mask once everything is setup */
-		irq_select_affinity(irq);
+		do_irq_select_affinity(irq, desc);
+
+	} else if ((new->flags & IRQF_TRIGGER_MASK)
+			&& (new->flags & IRQF_TRIGGER_MASK)
+				!= (desc->status & IRQ_TYPE_SENSE_MASK)) {
+		/* hope the handler works with the actual trigger mode... */
+		pr_warning("IRQ %d uses trigger mode %d; requested %d\n",
+				irq, (int)(desc->status & IRQ_TYPE_SENSE_MASK),
+				(int)(new->flags & IRQF_TRIGGER_MASK));
 	}
 
 	*p = new;
 
-	/* Exclude IRQ from balancing */
-	if (new->flags & IRQF_NOBALANCING)
-		desc->status |= IRQ_NO_BALANCING;
-
 	/* Reset broken irq detection when installing new handler */
 	desc->irq_count = 0;
 	desc->irqs_unhandled = 0;
@@ -464,7 +520,7 @@ int setup_irq(unsigned int irq, struct irqaction *new)
 	spin_unlock_irqrestore(&desc->lock, flags);
 
 	new->irq = irq;
-	register_irq_proc(irq);
+	register_irq_proc(irq, desc);
 	new->dir = NULL;
 	register_handler_proc(irq, new);
 
@@ -484,6 +540,20 @@ mismatch:
 }
 
 /**
+ *	setup_irq - setup an interrupt
+ *	@irq: Interrupt line to setup
+ *	@act: irqaction for the interrupt
+ *
+ * Used to statically setup interrupts in the early boot process.
+ */
+int setup_irq(unsigned int irq, struct irqaction *act)
+{
+	struct irq_desc *desc = irq_to_desc(irq);
+
+	return __setup_irq(irq, desc, act);
+}
+
+/**
  *	free_irq - free an interrupt
  *	@irq: Interrupt line to free
  *	@dev_id: Device identity to free
@@ -499,15 +569,15 @@ mismatch:
  */
 void free_irq(unsigned int irq, void *dev_id)
 {
-	struct irq_desc *desc;
+	struct irq_desc *desc = irq_to_desc(irq);
 	struct irqaction **p;
 	unsigned long flags;
 
 	WARN_ON(in_interrupt());
-	if (irq >= NR_IRQS)
+
+	if (!desc)
 		return;
 
-	desc = irq_desc + irq;
 	spin_lock_irqsave(&desc->lock, flags);
 	p = &desc->action;
 	for (;;) {
@@ -596,14 +666,28 @@ EXPORT_SYMBOL(free_irq);
  *	IRQF_SHARED		Interrupt is shared
  *	IRQF_DISABLED	Disable local interrupts while processing
  *	IRQF_SAMPLE_RANDOM	The interrupt can be used for entropy
+ *	IRQF_TRIGGER_*		Specify active edge(s) or level
  *
  */
 int request_irq(unsigned int irq, irq_handler_t handler,
 		unsigned long irqflags, const char *devname, void *dev_id)
 {
 	struct irqaction *action;
+	struct irq_desc *desc;
 	int retval;
 
+	/*
+	 * handle_IRQ_event() always ignores IRQF_DISABLED except for
+	 * the _first_ irqaction (sigh).  That can cause oopsing, but
+	 * the behavior is classified as "will not fix" so we need to
+	 * start nudging drivers away from using that idiom.
+	 */
+	if ((irqflags & (IRQF_SHARED|IRQF_DISABLED))
+			== (IRQF_SHARED|IRQF_DISABLED))
+		pr_warning("IRQ %d/%s: IRQF_DISABLED is not "
+				"guaranteed on shared IRQs\n",
+				irq, devname);
+
 #ifdef CONFIG_LOCKDEP
 	/*
 	 * Lockdep wants atomic interrupt handlers:
@@ -618,9 +702,12 @@ int request_irq(unsigned int irq, irq_handler_t handler,
 	 */
 	if ((irqflags & IRQF_SHARED) && !dev_id)
 		return -EINVAL;
-	if (irq >= NR_IRQS)
+
+	desc = irq_to_desc(irq);
+	if (!desc)
 		return -EINVAL;
-	if (irq_desc[irq].status & IRQ_NOREQUEST)
+
+	if (desc->status & IRQ_NOREQUEST)
 		return -EINVAL;
 	if (!handler)
 		return -EINVAL;
@@ -636,26 +723,29 @@ int request_irq(unsigned int irq, irq_handler_t handler,
 	action->next = NULL;
 	action->dev_id = dev_id;
 
+	retval = __setup_irq(irq, desc, action);
+	if (retval)
+		kfree(action);
+
 #ifdef CONFIG_DEBUG_SHIRQ
 	if (irqflags & IRQF_SHARED) {
 		/*
 		 * It's a shared IRQ -- the driver ought to be prepared for it
 		 * to happen immediately, so let's make sure....
-		 * We do this before actually registering it, to make sure that
-		 * a 'real' IRQ doesn't run in parallel with our fake
+		 * We disable the irq to make sure that a 'real' IRQ doesn't
+		 * run in parallel with our fake.
 		 */
 		unsigned long flags;
 
+		disable_irq(irq);
 		local_irq_save(flags);
+
 		handler(irq, dev_id);
+
 		local_irq_restore(flags);
+		enable_irq(irq);
 	}
 #endif
-
-	retval = setup_irq(irq, action);
-	if (retval)
-		kfree(action);
-
 	return retval;
 }
 EXPORT_SYMBOL(request_irq);
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index 77b7acc875c5..9db681d95814 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -1,20 +1,9 @@
 
 #include <linux/irq.h>
 
-void set_pending_irq(unsigned int irq, cpumask_t mask)
-{
-	struct irq_desc *desc = irq_desc + irq;
-	unsigned long flags;
-
-	spin_lock_irqsave(&desc->lock, flags);
-	desc->status |= IRQ_MOVE_PENDING;
-	irq_desc[irq].pending_mask = mask;
-	spin_unlock_irqrestore(&desc->lock, flags);
-}
-
 void move_masked_irq(int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 	cpumask_t tmp;
 
 	if (likely(!(desc->status & IRQ_MOVE_PENDING)))
@@ -30,7 +19,7 @@ void move_masked_irq(int irq)
 
 	desc->status &= ~IRQ_MOVE_PENDING;
 
-	if (unlikely(cpus_empty(irq_desc[irq].pending_mask)))
+	if (unlikely(cpus_empty(desc->pending_mask)))
 		return;
 
 	if (!desc->chip->set_affinity)
@@ -38,7 +27,7 @@ void move_masked_irq(int irq)
 
 	assert_spin_locked(&desc->lock);
 
-	cpus_and(tmp, irq_desc[irq].pending_mask, cpu_online_map);
+	cpus_and(tmp, desc->pending_mask, cpu_online_map);
 
 	/*
 	 * If there was a valid mask to work with, please
@@ -55,12 +44,12 @@ void move_masked_irq(int irq)
 	if (likely(!cpus_empty(tmp))) {
 		desc->chip->set_affinity(irq,tmp);
 	}
-	cpus_clear(irq_desc[irq].pending_mask);
+	cpus_clear(desc->pending_mask);
 }
 
 void move_native_irq(int irq)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 
 	if (likely(!(desc->status & IRQ_MOVE_PENDING)))
 		return;
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
new file mode 100644
index 000000000000..089c3746358a
--- /dev/null
+++ b/kernel/irq/numa_migrate.c
@@ -0,0 +1,122 @@
+/*
+ * NUMA irq-desc migration code
+ *
+ * Migrate IRQ data structures (irq_desc, chip_data, etc.) over to
+ * the new "home node" of the IRQ.
+ */
+
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+
+#include "internals.h"
+
+static void init_copy_kstat_irqs(struct irq_desc *old_desc,
+				 struct irq_desc *desc,
+				 int cpu, int nr)
+{
+	unsigned long bytes;
+
+	init_kstat_irqs(desc, cpu, nr);
+
+	if (desc->kstat_irqs != old_desc->kstat_irqs) {
+		/* Compute how many bytes we need per irq and allocate them */
+		bytes = nr * sizeof(unsigned int);
+
+		memcpy(desc->kstat_irqs, old_desc->kstat_irqs, bytes);
+	}
+}
+
+static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc)
+{
+	if (old_desc->kstat_irqs == desc->kstat_irqs)
+		return;
+
+	kfree(old_desc->kstat_irqs);
+	old_desc->kstat_irqs = NULL;
+}
+
+static void init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
+		 struct irq_desc *desc, int cpu)
+{
+	memcpy(desc, old_desc, sizeof(struct irq_desc));
+	desc->cpu = cpu;
+	lockdep_set_class(&desc->lock, &irq_desc_lock_class);
+	init_copy_kstat_irqs(old_desc, desc, cpu, nr_cpu_ids);
+	arch_init_copy_chip_data(old_desc, desc, cpu);
+}
+
+static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc)
+{
+	free_kstat_irqs(old_desc, desc);
+	arch_free_chip_data(old_desc, desc);
+}
+
+static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
+						int cpu)
+{
+	struct irq_desc *desc;
+	unsigned int irq;
+	unsigned long flags;
+	int node;
+
+	irq = old_desc->irq;
+
+	spin_lock_irqsave(&sparse_irq_lock, flags);
+
+	/* We have to check it to avoid races with another CPU */
+	desc = irq_desc_ptrs[irq];
+
+	if (desc && old_desc != desc)
+			goto out_unlock;
+
+	node = cpu_to_node(cpu);
+	desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
+	printk(KERN_DEBUG "  move irq_desc for %d to cpu %d node %d\n",
+		 irq, cpu, node);
+	if (!desc) {
+		printk(KERN_ERR "can not get new irq_desc for moving\n");
+		/* still use old one */
+		desc = old_desc;
+		goto out_unlock;
+	}
+	init_copy_one_irq_desc(irq, old_desc, desc, cpu);
+
+	irq_desc_ptrs[irq] = desc;
+
+	/* free the old one */
+	free_one_irq_desc(old_desc, desc);
+	kfree(old_desc);
+
+out_unlock:
+	spin_unlock_irqrestore(&sparse_irq_lock, flags);
+
+	return desc;
+}
+
+struct irq_desc *move_irq_desc(struct irq_desc *desc, int cpu)
+{
+	int old_cpu;
+	int node, old_node;
+
+	/* those all static, do move them */
+	if (desc->irq < NR_IRQS_LEGACY)
+		return desc;
+
+	old_cpu = desc->cpu;
+	printk(KERN_DEBUG
+		 "try to move irq_desc from cpu %d to %d\n", old_cpu, cpu);
+	if (old_cpu != cpu) {
+		node = cpu_to_node(cpu);
+		old_node = cpu_to_node(old_cpu);
+		if (old_node != node)
+			desc = __real_move_irq_desc(desc, cpu);
+		else
+			desc->cpu = cpu;
+	}
+
+	return desc;
+}
+
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index a09dd29c2fd7..f6b3440f05bc 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -19,7 +19,7 @@ static struct proc_dir_entry *root_irq_dir;
 
 static int irq_affinity_proc_show(struct seq_file *m, void *v)
 {
-	struct irq_desc *desc = irq_desc + (long)m->private;
+	struct irq_desc *desc = irq_to_desc((long)m->private);
 	cpumask_t *mask = &desc->affinity;
 
 #ifdef CONFIG_GENERIC_PENDING_IRQ
@@ -43,7 +43,7 @@ static ssize_t irq_affinity_proc_write(struct file *file,
 	cpumask_t new_value;
 	int err;
 
-	if (!irq_desc[irq].chip->set_affinity || no_irq_affinity ||
+	if (!irq_to_desc(irq)->chip->set_affinity || no_irq_affinity ||
 	    irq_balancing_disabled(irq))
 		return -EIO;
 
@@ -62,7 +62,7 @@ static ssize_t irq_affinity_proc_write(struct file *file,
 	if (!cpus_intersects(new_value, cpu_online_map))
 		/* Special case for empty set - allow the architecture
 		   code to set default SMP affinity. */
-		return irq_select_affinity(irq) ? -EINVAL : count;
+		return irq_select_affinity_usr(irq) ? -EINVAL : count;
 
 	irq_set_affinity(irq, new_value);
 
@@ -132,20 +132,20 @@ static const struct file_operations default_affinity_proc_fops = {
 static int irq_spurious_read(char *page, char **start, off_t off,
 				  int count, int *eof, void *data)
 {
-	struct irq_desc *d = &irq_desc[(long) data];
+	struct irq_desc *desc = irq_to_desc((long) data);
 	return sprintf(page, "count %u\n"
 			     "unhandled %u\n"
 			     "last_unhandled %u ms\n",
-			d->irq_count,
-			d->irqs_unhandled,
-			jiffies_to_msecs(d->last_unhandled));
+			desc->irq_count,
+			desc->irqs_unhandled,
+			jiffies_to_msecs(desc->last_unhandled));
 }
 
 #define MAX_NAMELEN 128
 
 static int name_unique(unsigned int irq, struct irqaction *new_action)
 {
-	struct irq_desc *desc = irq_desc + irq;
+	struct irq_desc *desc = irq_to_desc(irq);
 	struct irqaction *action;
 	unsigned long flags;
 	int ret = 1;
@@ -165,8 +165,9 @@ static int name_unique(unsigned int irq, struct irqaction *new_action)
 void register_handler_proc(unsigned int irq, struct irqaction *action)
 {
 	char name [MAX_NAMELEN];
+	struct irq_desc *desc = irq_to_desc(irq);
 
-	if (!irq_desc[irq].dir || action->dir || !action->name ||
+	if (!desc->dir || action->dir || !action->name ||
 					!name_unique(irq, action))
 		return;
 
@@ -174,36 +175,34 @@ void register_handler_proc(unsigned int irq, struct irqaction *action)
 	snprintf(name, MAX_NAMELEN, "%s", action->name);
 
 	/* create /proc/irq/1234/handler/ */
-	action->dir = proc_mkdir(name, irq_desc[irq].dir);
+	action->dir = proc_mkdir(name, desc->dir);
 }
 
 #undef MAX_NAMELEN
 
 #define MAX_NAMELEN 10
 
-void register_irq_proc(unsigned int irq)
+void register_irq_proc(unsigned int irq, struct irq_desc *desc)
 {
 	char name [MAX_NAMELEN];
 	struct proc_dir_entry *entry;
 
-	if (!root_irq_dir ||
-		(irq_desc[irq].chip == &no_irq_chip) ||
-			irq_desc[irq].dir)
+	if (!root_irq_dir || (desc->chip == &no_irq_chip) || desc->dir)
 		return;
 
 	memset(name, 0, MAX_NAMELEN);
 	sprintf(name, "%d", irq);
 
 	/* create /proc/irq/1234 */
-	irq_desc[irq].dir = proc_mkdir(name, root_irq_dir);
+	desc->dir = proc_mkdir(name, root_irq_dir);
 
 #ifdef CONFIG_SMP
 	/* create /proc/irq/<irq>/smp_affinity */
-	proc_create_data("smp_affinity", 0600, irq_desc[irq].dir,
+	proc_create_data("smp_affinity", 0600, desc->dir,
 			 &irq_affinity_proc_fops, (void *)(long)irq);
 #endif
 
-	entry = create_proc_entry("spurious", 0444, irq_desc[irq].dir);
+	entry = create_proc_entry("spurious", 0444, desc->dir);
 	if (entry) {
 		entry->data = (void *)(long)irq;
 		entry->read_proc = irq_spurious_read;
@@ -214,11 +213,14 @@ void register_irq_proc(unsigned int irq)
 
 void unregister_handler_proc(unsigned int irq, struct irqaction *action)
 {
-	if (action->dir)
-		remove_proc_entry(action->dir->name, irq_desc[irq].dir);
+	if (action->dir) {
+		struct irq_desc *desc = irq_to_desc(irq);
+
+		remove_proc_entry(action->dir->name, desc->dir);
+	}
 }
 
-void register_default_affinity_proc(void)
+static void register_default_affinity_proc(void)
 {
 #ifdef CONFIG_SMP
 	proc_create("irq/default_smp_affinity", 0600, NULL,
@@ -228,7 +230,8 @@ void register_default_affinity_proc(void)
 
 void init_irq_proc(void)
 {
-	int i;
+	unsigned int irq;
+	struct irq_desc *desc;
 
 	/* create /proc/irq */
 	root_irq_dir = proc_mkdir("irq", NULL);
@@ -240,7 +243,11 @@ void init_irq_proc(void)
 	/*
 	 * Create entries for all existing IRQs.
 	 */
-	for (i = 0; i < NR_IRQS; i++)
-		register_irq_proc(i);
+	for_each_irq_desc(irq, desc) {
+		if (!desc)
+			continue;
+
+		register_irq_proc(irq, desc);
+	}
 }
 
diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c
index a8046791ba2d..89c7117acf2b 100644
--- a/kernel/irq/resend.c
+++ b/kernel/irq/resend.c
@@ -33,10 +33,10 @@ static void resend_irqs(unsigned long arg)
 	struct irq_desc *desc;
 	int irq;
 
-	while (!bitmap_empty(irqs_resend, NR_IRQS)) {
-		irq = find_first_bit(irqs_resend, NR_IRQS);
+	while (!bitmap_empty(irqs_resend, nr_irqs)) {
+		irq = find_first_bit(irqs_resend, nr_irqs);
 		clear_bit(irq, irqs_resend);
-		desc = irq_desc + irq;
+		desc = irq_to_desc(irq);
 		local_irq_disable();
 		desc->handle_irq(irq, desc);
 		local_irq_enable();
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index c66d3f10e853..3738107531fd 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -12,83 +12,127 @@
 #include <linux/kallsyms.h>
 #include <linux/interrupt.h>
 #include <linux/moduleparam.h>
+#include <linux/timer.h>
 
 static int irqfixup __read_mostly;
 
+#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10)
+static void poll_spurious_irqs(unsigned long dummy);
+static DEFINE_TIMER(poll_spurious_irq_timer, poll_spurious_irqs, 0, 0);
+
 /*
  * Recovery handler for misrouted interrupts.
  */
-static int misrouted_irq(int irq)
+static int try_one_irq(int irq, struct irq_desc *desc)
 {
-	int i;
-	int ok = 0;
-	int work = 0;	/* Did we do work for a real IRQ */
-
-	for (i = 1; i < NR_IRQS; i++) {
-		struct irq_desc *desc = irq_desc + i;
-		struct irqaction *action;
-
-		if (i == irq)	/* Already tried */
-			continue;
+	struct irqaction *action;
+	int ok = 0, work = 0;
 
-		spin_lock(&desc->lock);
-		/* Already running on another processor */
-		if (desc->status & IRQ_INPROGRESS) {
-			/*
-			 * Already running: If it is shared get the other
-			 * CPU to go looking for our mystery interrupt too
-			 */
-			if (desc->action && (desc->action->flags & IRQF_SHARED))
-				desc->status |= IRQ_PENDING;
-			spin_unlock(&desc->lock);
-			continue;
-		}
-		/* Honour the normal IRQ locking */
-		desc->status |= IRQ_INPROGRESS;
-		action = desc->action;
+	spin_lock(&desc->lock);
+	/* Already running on another processor */
+	if (desc->status & IRQ_INPROGRESS) {
+		/*
+		 * Already running: If it is shared get the other
+		 * CPU to go looking for our mystery interrupt too
+		 */
+		if (desc->action && (desc->action->flags & IRQF_SHARED))
+			desc->status |= IRQ_PENDING;
 		spin_unlock(&desc->lock);
+		return ok;
+	}
+	/* Honour the normal IRQ locking */
+	desc->status |= IRQ_INPROGRESS;
+	action = desc->action;
+	spin_unlock(&desc->lock);
 
-		while (action) {
-			/* Only shared IRQ handlers are safe to call */
-			if (action->flags & IRQF_SHARED) {
-				if (action->handler(i, action->dev_id) ==
-						IRQ_HANDLED)
-					ok = 1;
-			}
-			action = action->next;
+	while (action) {
+		/* Only shared IRQ handlers are safe to call */
+		if (action->flags & IRQF_SHARED) {
+			if (action->handler(irq, action->dev_id) ==
+				IRQ_HANDLED)
+				ok = 1;
 		}
-		local_irq_disable();
-		/* Now clean up the flags */
-		spin_lock(&desc->lock);
-		action = desc->action;
+		action = action->next;
+	}
+	local_irq_disable();
+	/* Now clean up the flags */
+	spin_lock(&desc->lock);
+	action = desc->action;
 
+	/*
+	 * While we were looking for a fixup someone queued a real
+	 * IRQ clashing with our walk:
+	 */
+	while ((desc->status & IRQ_PENDING) && action) {
 		/*
-		 * While we were looking for a fixup someone queued a real
-		 * IRQ clashing with our walk:
-		 */
-		while ((desc->status & IRQ_PENDING) && action) {
-			/*
-			 * Perform real IRQ processing for the IRQ we deferred
-			 */
-			work = 1;
-			spin_unlock(&desc->lock);
-			handle_IRQ_event(i, action);
-			spin_lock(&desc->lock);
-			desc->status &= ~IRQ_PENDING;
-		}
-		desc->status &= ~IRQ_INPROGRESS;
-		/*
-		 * If we did actual work for the real IRQ line we must let the
-		 * IRQ controller clean up too
+		 * Perform real IRQ processing for the IRQ we deferred
 		 */
-		if (work && desc->chip && desc->chip->end)
-			desc->chip->end(i);
+		work = 1;
 		spin_unlock(&desc->lock);
+		handle_IRQ_event(irq, action);
+		spin_lock(&desc->lock);
+		desc->status &= ~IRQ_PENDING;
+	}
+	desc->status &= ~IRQ_INPROGRESS;
+	/*
+	 * If we did actual work for the real IRQ line we must let the
+	 * IRQ controller clean up too
+	 */
+	if (work && desc->chip && desc->chip->end)
+		desc->chip->end(irq);
+	spin_unlock(&desc->lock);
+
+	return ok;
+}
+
+static int misrouted_irq(int irq)
+{
+	struct irq_desc *desc;
+	int i, ok = 0;
+
+	for_each_irq_desc(i, desc) {
+		if (!desc)
+			continue;
+
+		if (!i)
+			 continue;
+
+		if (i == irq)	/* Already tried */
+			continue;
+
+		if (try_one_irq(i, desc))
+			ok = 1;
 	}
 	/* So the caller can adjust the irq error counts */
 	return ok;
 }
 
+static void poll_spurious_irqs(unsigned long dummy)
+{
+	struct irq_desc *desc;
+	int i;
+
+	for_each_irq_desc(i, desc) {
+		unsigned int status;
+
+		if (!desc)
+			continue;
+		if (!i)
+			 continue;
+
+		/* Racy but it doesn't matter */
+		status = desc->status;
+		barrier();
+		if (!(status & IRQ_SPURIOUS_DISABLED))
+			continue;
+
+		try_one_irq(i, desc);
+	}
+
+	mod_timer(&poll_spurious_irq_timer,
+		  jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
+}
+
 /*
  * If 99,900 of the previous 100,000 interrupts have not been handled
  * then assume that the IRQ is stuck in some manner. Drop a diagnostic
@@ -137,7 +181,9 @@ report_bad_irq(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret)
 	}
 }
 
-static inline int try_misrouted_irq(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret)
+static inline int
+try_misrouted_irq(unsigned int irq, struct irq_desc *desc,
+		  irqreturn_t action_ret)
 {
 	struct irqaction *action;
 
@@ -212,6 +258,9 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc,
 		desc->status |= IRQ_DISABLED | IRQ_SPURIOUS_DISABLED;
 		desc->depth++;
 		desc->chip->disable(irq);
+
+		mod_timer(&poll_spurious_irq_timer,
+			  jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
 	}
 	desc->irqs_unhandled = 0;
 }
@@ -241,7 +290,7 @@ static int __init irqfixup_setup(char *str)
 
 __setup("irqfixup", irqfixup_setup);
 module_param(irqfixup, int, 0644);
-MODULE_PARM_DESC("irqfixup", "0: No fixup, 1: irqfixup mode 2: irqpoll mode");
+MODULE_PARM_DESC("irqfixup", "0: No fixup, 1: irqfixup mode, 2: irqpoll mode");
 
 static int __init irqpoll_setup(char *str)
 {
diff --git a/kernel/itimer.c b/kernel/itimer.c
index ab982747d9bd..db7c358b9a02 100644
--- a/kernel/itimer.c
+++ b/kernel/itimer.c
@@ -55,17 +55,15 @@ int do_getitimer(int which, struct itimerval *value)
 		spin_unlock_irq(&tsk->sighand->siglock);
 		break;
 	case ITIMER_VIRTUAL:
-		read_lock(&tasklist_lock);
 		spin_lock_irq(&tsk->sighand->siglock);
 		cval = tsk->signal->it_virt_expires;
 		cinterval = tsk->signal->it_virt_incr;
 		if (!cputime_eq(cval, cputime_zero)) {
-			struct task_struct *t = tsk;
-			cputime_t utime = tsk->signal->utime;
-			do {
-				utime = cputime_add(utime, t->utime);
-				t = next_thread(t);
-			} while (t != tsk);
+			struct task_cputime cputime;
+			cputime_t utime;
+
+			thread_group_cputime(tsk, &cputime);
+			utime = cputime.utime;
 			if (cputime_le(cval, utime)) { /* about to fire */
 				cval = jiffies_to_cputime(1);
 			} else {
@@ -73,25 +71,19 @@ int do_getitimer(int which, struct itimerval *value)
 			}
 		}
 		spin_unlock_irq(&tsk->sighand->siglock);
-		read_unlock(&tasklist_lock);
 		cputime_to_timeval(cval, &value->it_value);
 		cputime_to_timeval(cinterval, &value->it_interval);
 		break;
 	case ITIMER_PROF:
-		read_lock(&tasklist_lock);
 		spin_lock_irq(&tsk->sighand->siglock);
 		cval = tsk->signal->it_prof_expires;
 		cinterval = tsk->signal->it_prof_incr;
 		if (!cputime_eq(cval, cputime_zero)) {
-			struct task_struct *t = tsk;
-			cputime_t ptime = cputime_add(tsk->signal->utime,
-						      tsk->signal->stime);
-			do {
-				ptime = cputime_add(ptime,
-						    cputime_add(t->utime,
-								t->stime));
-				t = next_thread(t);
-			} while (t != tsk);
+			struct task_cputime times;
+			cputime_t ptime;
+
+			thread_group_cputime(tsk, &times);
+			ptime = cputime_add(times.utime, times.stime);
 			if (cputime_le(cval, ptime)) { /* about to fire */
 				cval = jiffies_to_cputime(1);
 			} else {
@@ -99,7 +91,6 @@ int do_getitimer(int which, struct itimerval *value)
 			}
 		}
 		spin_unlock_irq(&tsk->sighand->siglock);
-		read_unlock(&tasklist_lock);
 		cputime_to_timeval(cval, &value->it_value);
 		cputime_to_timeval(cinterval, &value->it_interval);
 		break;
@@ -185,7 +176,6 @@ again:
 	case ITIMER_VIRTUAL:
 		nval = timeval_to_cputime(&value->it_value);
 		ninterval = timeval_to_cputime(&value->it_interval);
-		read_lock(&tasklist_lock);
 		spin_lock_irq(&tsk->sighand->siglock);
 		cval = tsk->signal->it_virt_expires;
 		cinterval = tsk->signal->it_virt_incr;
@@ -200,7 +190,6 @@ again:
 		tsk->signal->it_virt_expires = nval;
 		tsk->signal->it_virt_incr = ninterval;
 		spin_unlock_irq(&tsk->sighand->siglock);
-		read_unlock(&tasklist_lock);
 		if (ovalue) {
 			cputime_to_timeval(cval, &ovalue->it_value);
 			cputime_to_timeval(cinterval, &ovalue->it_interval);
@@ -209,7 +198,6 @@ again:
 	case ITIMER_PROF:
 		nval = timeval_to_cputime(&value->it_value);
 		ninterval = timeval_to_cputime(&value->it_interval);
-		read_lock(&tasklist_lock);
 		spin_lock_irq(&tsk->sighand->siglock);
 		cval = tsk->signal->it_prof_expires;
 		cinterval = tsk->signal->it_prof_incr;
@@ -224,7 +212,6 @@ again:
 		tsk->signal->it_prof_expires = nval;
 		tsk->signal->it_prof_incr = ninterval;
 		spin_unlock_irq(&tsk->sighand->siglock);
-		read_unlock(&tasklist_lock);
 		if (ovalue) {
 			cputime_to_timeval(cval, &ovalue->it_value);
 			cputime_to_timeval(cinterval, &ovalue->it_interval);
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 38fc10ac7541..e694afa0eb8c 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -30,20 +30,19 @@
 #define all_var 0
 #endif
 
-/* These will be re-linked against their real values during the second link stage */
-extern const unsigned long kallsyms_addresses[] __attribute__((weak));
-extern const u8 kallsyms_names[] __attribute__((weak));
+extern const unsigned long kallsyms_addresses[];
+extern const u8 kallsyms_names[];
 
 /* tell the compiler that the count isn't in the small data section if the arch
  * has one (eg: FRV)
  */
 extern const unsigned long kallsyms_num_syms
-__attribute__((weak, section(".rodata")));
+	__attribute__((__section__(".rodata")));
 
-extern const u8 kallsyms_token_table[] __attribute__((weak));
-extern const u16 kallsyms_token_index[] __attribute__((weak));
+extern const u8 kallsyms_token_table[];
+extern const u16 kallsyms_token_index[];
 
-extern const unsigned long kallsyms_markers[] __attribute__((weak));
+extern const unsigned long kallsyms_markers[];
 
 static inline int is_kernel_inittext(unsigned long addr)
 {
@@ -168,9 +167,6 @@ static unsigned long get_symbol_pos(unsigned long addr,
 	unsigned long symbol_start = 0, symbol_end = 0;
 	unsigned long i, low, high, mid;
 
-	/* This kernel should never had been booted. */
-	BUG_ON(!kallsyms_addresses);
-
 	/* do a binary search on the sorted kallsyms_addresses array */
 	low = 0;
 	high = kallsyms_num_syms;
@@ -260,7 +256,6 @@ const char *kallsyms_lookup(unsigned long addr,
 	/* see if it's in a module */
 	return module_address_lookup(addr, symbolsize, offset, modname,
 				     namebuf);
-	return NULL;
 }
 
 int lookup_symbol_name(unsigned long addr, char *symname)
@@ -305,17 +300,24 @@ int sprint_symbol(char *buffer, unsigned long address)
 	char *modname;
 	const char *name;
 	unsigned long offset, size;
-	char namebuf[KSYM_NAME_LEN];
+	int len;
 
-	name = kallsyms_lookup(address, &size, &offset, &modname, namebuf);
+	name = kallsyms_lookup(address, &size, &offset, &modname, buffer);
 	if (!name)
 		return sprintf(buffer, "0x%lx", address);
 
+	if (name != buffer)
+		strcpy(buffer, name);
+	len = strlen(buffer);
+	buffer += len;
+
 	if (modname)
-		return sprintf(buffer, "%s+%#lx/%#lx [%s]", name, offset,
-				size, modname);
+		len += sprintf(buffer, "+%#lx/%#lx [%s]",
+						offset, size, modname);
 	else
-		return sprintf(buffer, "%s+%#lx/%#lx", name, offset, size);
+		len += sprintf(buffer, "+%#lx/%#lx", offset, size);
+
+	return len;
 }
 
 /* Look up a kernel symbol and print it to the kernel messages. */
diff --git a/kernel/kexec.c b/kernel/kexec.c
index aef265325cd3..ac0fde7b54d0 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -30,6 +30,7 @@
 #include <linux/pm.h>
 #include <linux/cpu.h>
 #include <linux/console.h>
+#include <linux/vmalloc.h>
 
 #include <asm/page.h>
 #include <asm/uaccess.h>
@@ -1371,6 +1372,7 @@ static int __init crash_save_vmcoreinfo_init(void)
 	VMCOREINFO_SYMBOL(node_online_map);
 	VMCOREINFO_SYMBOL(swapper_pg_dir);
 	VMCOREINFO_SYMBOL(_stext);
+	VMCOREINFO_SYMBOL(vmlist);
 
 #ifndef CONFIG_NEED_MULTIPLE_NODES
 	VMCOREINFO_SYMBOL(mem_map);
@@ -1406,6 +1408,7 @@ static int __init crash_save_vmcoreinfo_init(void)
 	VMCOREINFO_OFFSET(free_area, free_list);
 	VMCOREINFO_OFFSET(list_head, next);
 	VMCOREINFO_OFFSET(list_head, prev);
+	VMCOREINFO_OFFSET(vm_struct, addr);
 	VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
 	VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
 	VMCOREINFO_NUMBER(NR_FREE_PAGES);
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 2456d1a0befb..b46dbb908669 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -113,15 +113,15 @@ int request_module(const char *fmt, ...)
 	return ret;
 }
 EXPORT_SYMBOL(request_module);
-#endif /* CONFIG_KMOD */
+#endif /* CONFIG_MODULES */
 
 struct subprocess_info {
 	struct work_struct work;
 	struct completion *complete;
+	struct cred *cred;
 	char *path;
 	char **argv;
 	char **envp;
-	struct key *ring;
 	enum umh_wait wait;
 	int retval;
 	struct file *stdin;
@@ -134,19 +134,20 @@ struct subprocess_info {
 static int ____call_usermodehelper(void *data)
 {
 	struct subprocess_info *sub_info = data;
-	struct key *new_session, *old_session;
 	int retval;
 
-	/* Unblock all signals and set the session keyring. */
-	new_session = key_get(sub_info->ring);
+	BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
+
+	/* Unblock all signals */
 	spin_lock_irq(&current->sighand->siglock);
-	old_session = __install_session_keyring(current, new_session);
 	flush_signal_handlers(current, 1);
 	sigemptyset(&current->blocked);
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);
 
-	key_put(old_session);
+	/* Install the credentials */
+	commit_creds(sub_info->cred);
+	sub_info->cred = NULL;
 
 	/* Install input pipe when needed */
 	if (sub_info->stdin) {
@@ -185,6 +186,8 @@ void call_usermodehelper_freeinfo(struct subprocess_info *info)
 {
 	if (info->cleanup)
 		(*info->cleanup)(info->argv, info->envp);
+	if (info->cred)
+		put_cred(info->cred);
 	kfree(info);
 }
 EXPORT_SYMBOL(call_usermodehelper_freeinfo);
@@ -240,6 +243,8 @@ static void __call_usermodehelper(struct work_struct *work)
 	pid_t pid;
 	enum umh_wait wait = sub_info->wait;
 
+	BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
+
 	/* CLONE_VFORK: wait until the usermode helper has execve'd
 	 * successfully We need the data structures to stay around
 	 * until that is done.  */
@@ -265,7 +270,7 @@ static void __call_usermodehelper(struct work_struct *work)
 	}
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 /*
  * If set, call_usermodehelper_exec() will exit immediately returning -EBUSY
  * (used for preventing user land processes from being created after the user
@@ -288,39 +293,37 @@ static DECLARE_WAIT_QUEUE_HEAD(running_helpers_waitq);
  */
 #define RUNNING_HELPERS_TIMEOUT	(5 * HZ)
 
-static int usermodehelper_pm_callback(struct notifier_block *nfb,
-					unsigned long action,
-					void *ignored)
+/**
+ * usermodehelper_disable - prevent new helpers from being started
+ */
+int usermodehelper_disable(void)
 {
 	long retval;
 
-	switch (action) {
-	case PM_HIBERNATION_PREPARE:
-	case PM_SUSPEND_PREPARE:
-		usermodehelper_disabled = 1;
-		smp_mb();
-		/*
-		 * From now on call_usermodehelper_exec() won't start any new
-		 * helpers, so it is sufficient if running_helpers turns out to
-		 * be zero at one point (it may be increased later, but that
-		 * doesn't matter).
-		 */
-		retval = wait_event_timeout(running_helpers_waitq,
+	usermodehelper_disabled = 1;
+	smp_mb();
+	/*
+	 * From now on call_usermodehelper_exec() won't start any new
+	 * helpers, so it is sufficient if running_helpers turns out to
+	 * be zero at one point (it may be increased later, but that
+	 * doesn't matter).
+	 */
+	retval = wait_event_timeout(running_helpers_waitq,
 					atomic_read(&running_helpers) == 0,
 					RUNNING_HELPERS_TIMEOUT);
-		if (retval) {
-			return NOTIFY_OK;
-		} else {
-			usermodehelper_disabled = 0;
-			return NOTIFY_BAD;
-		}
-	case PM_POST_HIBERNATION:
-	case PM_POST_SUSPEND:
-		usermodehelper_disabled = 0;
-		return NOTIFY_OK;
-	}
+	if (retval)
+		return 0;
 
-	return NOTIFY_DONE;
+	usermodehelper_disabled = 0;
+	return -EAGAIN;
+}
+
+/**
+ * usermodehelper_enable - allow new helpers to be started again
+ */
+void usermodehelper_enable(void)
+{
+	usermodehelper_disabled = 0;
 }
 
 static void helper_lock(void)
@@ -334,18 +337,12 @@ static void helper_unlock(void)
 	if (atomic_dec_and_test(&running_helpers))
 		wake_up(&running_helpers_waitq);
 }
-
-static void register_pm_notifier_callback(void)
-{
-	pm_notifier(usermodehelper_pm_callback, 0);
-}
-#else /* CONFIG_PM */
+#else /* CONFIG_PM_SLEEP */
 #define usermodehelper_disabled	0
 
 static inline void helper_lock(void) {}
 static inline void helper_unlock(void) {}
-static inline void register_pm_notifier_callback(void) {}
-#endif /* CONFIG_PM */
+#endif /* CONFIG_PM_SLEEP */
 
 /**
  * call_usermodehelper_setup - prepare to call a usermode helper
@@ -370,6 +367,9 @@ struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
 	sub_info->path = path;
 	sub_info->argv = argv;
 	sub_info->envp = envp;
+	sub_info->cred = prepare_usermodehelper_creds();
+	if (!sub_info->cred)
+		return NULL;
 
   out:
 	return sub_info;
@@ -384,7 +384,13 @@ EXPORT_SYMBOL(call_usermodehelper_setup);
 void call_usermodehelper_setkeys(struct subprocess_info *info,
 				 struct key *session_keyring)
 {
-	info->ring = session_keyring;
+#ifdef CONFIG_KEYS
+	struct thread_group_cred *tgcred = info->cred->tgcred;
+	key_put(tgcred->session_keyring);
+	tgcred->session_keyring = key_get(session_keyring);
+#else
+	BUG();
+#endif
 }
 EXPORT_SYMBOL(call_usermodehelper_setkeys);
 
@@ -452,6 +458,8 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info,
 	DECLARE_COMPLETION_ONSTACK(done);
 	int retval = 0;
 
+	BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
+
 	helper_lock();
 	if (sub_info->path[0] == '\0')
 		goto out;
@@ -515,5 +523,4 @@ void __init usermodehelper_init(void)
 {
 	khelper_wq = create_singlethread_workqueue("khelper");
 	BUG_ON(!khelper_wq);
-	register_pm_notifier_callback();
 }
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 75bc2cd9ebc6..9f8a3f25259a 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -72,7 +72,7 @@ static bool kprobe_enabled;
 DEFINE_MUTEX(kprobe_mutex);		/* Protects kprobe_table */
 static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;
 static struct {
-	spinlock_t lock ____cacheline_aligned;
+	spinlock_t lock ____cacheline_aligned_in_smp;
 } kretprobe_table_locks[KPROBE_TABLE_SIZE];
 
 static spinlock_t *kretprobe_table_lock_ptr(unsigned long hash)
@@ -404,7 +404,7 @@ void kretprobe_hash_lock(struct task_struct *tsk,
 	spin_lock_irqsave(hlist_lock, *flags);
 }
 
-void kretprobe_table_lock(unsigned long hash, unsigned long *flags)
+static void kretprobe_table_lock(unsigned long hash, unsigned long *flags)
 {
 	spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash);
 	spin_lock_irqsave(hlist_lock, *flags);
@@ -613,30 +613,37 @@ static int __kprobes __register_kprobe(struct kprobe *p,
 		return -EINVAL;
 	p->addr = addr;
 
-	if (!kernel_text_address((unsigned long) p->addr) ||
-	    in_kprobes_functions((unsigned long) p->addr))
+	preempt_disable();
+	if (!__kernel_text_address((unsigned long) p->addr) ||
+	    in_kprobes_functions((unsigned long) p->addr)) {
+		preempt_enable();
 		return -EINVAL;
+	}
 
 	p->mod_refcounted = 0;
 
 	/*
 	 * Check if are we probing a module.
 	 */
-	probed_mod = module_text_address((unsigned long) p->addr);
+	probed_mod = __module_text_address((unsigned long) p->addr);
 	if (probed_mod) {
-		struct module *calling_mod = module_text_address(called_from);
+		struct module *calling_mod;
+		calling_mod = __module_text_address(called_from);
 		/*
 		 * We must allow modules to probe themself and in this case
 		 * avoid incrementing the module refcount, so as to allow
 		 * unloading of self probing modules.
 		 */
 		if (calling_mod && calling_mod != probed_mod) {
-			if (unlikely(!try_module_get(probed_mod)))
+			if (unlikely(!try_module_get(probed_mod))) {
+				preempt_enable();
 				return -EINVAL;
+			}
 			p->mod_refcounted = 1;
 		} else
 			probed_mod = NULL;
 	}
+	preempt_enable();
 
 	p->nmissed = 0;
 	INIT_LIST_HEAD(&p->list);
@@ -718,6 +725,10 @@ static void __kprobes __unregister_kprobe_bottom(struct kprobe *p)
 	struct kprobe *old_p;
 
 	if (p->mod_refcounted) {
+		/*
+		 * Since we've already incremented refcount,
+		 * we don't need to disable preemption.
+		 */
 		mod = module_text_address((unsigned long)p->addr);
 		if (mod)
 			module_put(mod);
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index e53bc30e9ba5..08dd8ed86c77 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -14,6 +14,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/kexec.h>
+#include <linux/profile.h>
 #include <linux/sched.h>
 
 #define KERNEL_ATTR_RO(_name) \
@@ -53,6 +54,37 @@ static ssize_t uevent_helper_store(struct kobject *kobj,
 KERNEL_ATTR_RW(uevent_helper);
 #endif
 
+#ifdef CONFIG_PROFILING
+static ssize_t profiling_show(struct kobject *kobj,
+				  struct kobj_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", prof_on);
+}
+static ssize_t profiling_store(struct kobject *kobj,
+				   struct kobj_attribute *attr,
+				   const char *buf, size_t count)
+{
+	int ret;
+
+	if (prof_on)
+		return -EEXIST;
+	/*
+	 * This eventually calls into get_option() which
+	 * has a ton of callers and is not const.  It is
+	 * easiest to cast it away here.
+	 */
+	profile_setup((char *)buf);
+	ret = profile_init();
+	if (ret)
+		return ret;
+	ret = create_proc_profile();
+	if (ret)
+		return ret;
+	return count;
+}
+KERNEL_ATTR_RW(profiling);
+#endif
+
 #ifdef CONFIG_KEXEC
 static ssize_t kexec_loaded_show(struct kobject *kobj,
 				 struct kobj_attribute *attr, char *buf)
@@ -109,6 +141,9 @@ static struct attribute * kernel_attrs[] = {
 	&uevent_seqnum_attr.attr,
 	&uevent_helper_attr.attr,
 #endif
+#ifdef CONFIG_PROFILING
+	&profiling_attr.attr,
+#endif
 #ifdef CONFIG_KEXEC
 	&kexec_loaded_attr.attr,
 	&kexec_crash_loaded_attr.attr,
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 96cff2f8710b..4fbc456f393d 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -13,6 +13,7 @@
 #include <linux/file.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <trace/sched.h>
 
 #define KTHREAD_NICE_LEVEL (-5)
 
@@ -20,6 +21,9 @@ static DEFINE_SPINLOCK(kthread_create_lock);
 static LIST_HEAD(kthread_create_list);
 struct task_struct *kthreadd_task;
 
+DEFINE_TRACE(sched_kthread_stop);
+DEFINE_TRACE(sched_kthread_stop_ret);
+
 struct kthread_create_info
 {
 	/* Information passed to kthread() from kthreadd. */
@@ -171,12 +175,11 @@ EXPORT_SYMBOL(kthread_create);
  */
 void kthread_bind(struct task_struct *k, unsigned int cpu)
 {
-	if (k->state != TASK_UNINTERRUPTIBLE) {
+	/* Must have done schedule() in kthread() before we set_task_cpu */
+	if (!wait_task_inactive(k, TASK_UNINTERRUPTIBLE)) {
 		WARN_ON(1);
 		return;
 	}
-	/* Must have done schedule() in kthread() before we set_task_cpu */
-	wait_task_inactive(k, 0);
 	set_task_cpu(k, cpu);
 	k->cpus_allowed = cpumask_of_cpu(cpu);
 	k->rt.nr_cpus_allowed = 1;
@@ -206,6 +209,8 @@ int kthread_stop(struct task_struct *k)
 	/* It could exit after stop_info.k set, but before wake_up_process. */
 	get_task_struct(k);
 
+	trace_sched_kthread_stop(k);
+
 	/* Must init completion *before* thread sees kthread_stop_info.k */
 	init_completion(&kthread_stop_info.done);
 	smp_wmb();
@@ -221,6 +226,8 @@ int kthread_stop(struct task_struct *k)
 	ret = kthread_stop_info.err;
 	mutex_unlock(&kthread_stop_lock);
 
+	trace_sched_kthread_stop_ret(ret);
+
 	return ret;
 }
 EXPORT_SYMBOL(kthread_stop);
diff --git a/kernel/latencytop.c b/kernel/latencytop.c
index 5e7b45c56923..449db466bdbc 100644
--- a/kernel/latencytop.c
+++ b/kernel/latencytop.c
@@ -191,7 +191,7 @@ static int lstats_show(struct seq_file *m, void *v)
 				latency_record[i].time,
 				latency_record[i].max);
 			for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
-				char sym[KSYM_NAME_LEN];
+				char sym[KSYM_SYMBOL_LEN];
 				char *c;
 				if (!latency_record[i].backtrace[q])
 					break;
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index dbda475b13bd..06b0c3568f0b 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -25,6 +25,7 @@
  * Thanks to Arjan van de Ven for coming up with the initial idea of
  * mapping lock dependencies runtime.
  */
+#define DISABLE_BRANCH_PROFILING
 #include <linux/mutex.h>
 #include <linux/sched.h>
 #include <linux/delay.h>
@@ -136,16 +137,16 @@ static inline struct lock_class *hlock_class(struct held_lock *hlock)
 #ifdef CONFIG_LOCK_STAT
 static DEFINE_PER_CPU(struct lock_class_stats[MAX_LOCKDEP_KEYS], lock_stats);
 
-static int lock_contention_point(struct lock_class *class, unsigned long ip)
+static int lock_point(unsigned long points[], unsigned long ip)
 {
 	int i;
 
-	for (i = 0; i < ARRAY_SIZE(class->contention_point); i++) {
-		if (class->contention_point[i] == 0) {
-			class->contention_point[i] = ip;
+	for (i = 0; i < LOCKSTAT_POINTS; i++) {
+		if (points[i] == 0) {
+			points[i] = ip;
 			break;
 		}
-		if (class->contention_point[i] == ip)
+		if (points[i] == ip)
 			break;
 	}
 
@@ -185,6 +186,9 @@ struct lock_class_stats lock_stats(struct lock_class *class)
 		for (i = 0; i < ARRAY_SIZE(stats.contention_point); i++)
 			stats.contention_point[i] += pcs->contention_point[i];
 
+		for (i = 0; i < ARRAY_SIZE(stats.contending_point); i++)
+			stats.contending_point[i] += pcs->contending_point[i];
+
 		lock_time_add(&pcs->read_waittime, &stats.read_waittime);
 		lock_time_add(&pcs->write_waittime, &stats.write_waittime);
 
@@ -209,6 +213,7 @@ void clear_lock_stats(struct lock_class *class)
 		memset(cpu_stats, 0, sizeof(struct lock_class_stats));
 	}
 	memset(class->contention_point, 0, sizeof(class->contention_point));
+	memset(class->contending_point, 0, sizeof(class->contending_point));
 }
 
 static struct lock_class_stats *get_lock_stats(struct lock_class *class)
@@ -287,14 +292,12 @@ void lockdep_off(void)
 {
 	current->lockdep_recursion++;
 }
-
 EXPORT_SYMBOL(lockdep_off);
 
 void lockdep_on(void)
 {
 	current->lockdep_recursion--;
 }
-
 EXPORT_SYMBOL(lockdep_on);
 
 /*
@@ -576,7 +579,8 @@ static void print_lock_class_header(struct lock_class *class, int depth)
 /*
  * printk all lock dependencies starting at <entry>:
  */
-static void print_lock_dependencies(struct lock_class *class, int depth)
+static void __used
+print_lock_dependencies(struct lock_class *class, int depth)
 {
 	struct lock_list *entry;
 
@@ -2169,12 +2173,11 @@ void early_boot_irqs_on(void)
 /*
  * Hardirqs will be enabled:
  */
-void trace_hardirqs_on_caller(unsigned long a0)
+void trace_hardirqs_on_caller(unsigned long ip)
 {
 	struct task_struct *curr = current;
-	unsigned long ip;
 
-	time_hardirqs_on(CALLER_ADDR0, a0);
+	time_hardirqs_on(CALLER_ADDR0, ip);
 
 	if (unlikely(!debug_locks || current->lockdep_recursion))
 		return;
@@ -2188,7 +2191,6 @@ void trace_hardirqs_on_caller(unsigned long a0)
 	}
 	/* we'll do an OFF -> ON transition: */
 	curr->hardirqs_enabled = 1;
-	ip = (unsigned long) __builtin_return_address(0);
 
 	if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
 		return;
@@ -2224,11 +2226,11 @@ EXPORT_SYMBOL(trace_hardirqs_on);
 /*
  * Hardirqs were disabled:
  */
-void trace_hardirqs_off_caller(unsigned long a0)
+void trace_hardirqs_off_caller(unsigned long ip)
 {
 	struct task_struct *curr = current;
 
-	time_hardirqs_off(CALLER_ADDR0, a0);
+	time_hardirqs_off(CALLER_ADDR0, ip);
 
 	if (unlikely(!debug_locks || current->lockdep_recursion))
 		return;
@@ -2241,7 +2243,7 @@ void trace_hardirqs_off_caller(unsigned long a0)
 		 * We have done an ON -> OFF transition:
 		 */
 		curr->hardirqs_enabled = 0;
-		curr->hardirq_disable_ip = _RET_IP_;
+		curr->hardirq_disable_ip = ip;
 		curr->hardirq_disable_event = ++curr->irq_events;
 		debug_atomic_inc(&hardirqs_off_events);
 	} else
@@ -2510,7 +2512,6 @@ void lockdep_init_map(struct lockdep_map *lock, const char *name,
 	if (subclass)
 		register_lock_class(lock, subclass, 1);
 }
-
 EXPORT_SYMBOL_GPL(lockdep_init_map);
 
 /*
@@ -2691,8 +2692,9 @@ static int check_unlock(struct task_struct *curr, struct lockdep_map *lock,
 }
 
 static int
-__lock_set_subclass(struct lockdep_map *lock,
-		    unsigned int subclass, unsigned long ip)
+__lock_set_class(struct lockdep_map *lock, const char *name,
+		 struct lock_class_key *key, unsigned int subclass,
+		 unsigned long ip)
 {
 	struct task_struct *curr = current;
 	struct held_lock *hlock, *prev_hlock;
@@ -2719,6 +2721,7 @@ __lock_set_subclass(struct lockdep_map *lock,
 	return print_unlock_inbalance_bug(curr, lock, ip);
 
 found_it:
+	lockdep_init_map(lock, name, key, 0);
 	class = register_lock_class(lock, subclass, 0);
 	hlock->class_idx = class - lock_classes + 1;
 
@@ -2903,9 +2906,9 @@ static void check_flags(unsigned long flags)
 #endif
 }
 
-void
-lock_set_subclass(struct lockdep_map *lock,
-		  unsigned int subclass, unsigned long ip)
+void lock_set_class(struct lockdep_map *lock, const char *name,
+		    struct lock_class_key *key, unsigned int subclass,
+		    unsigned long ip)
 {
 	unsigned long flags;
 
@@ -2915,13 +2918,12 @@ lock_set_subclass(struct lockdep_map *lock,
 	raw_local_irq_save(flags);
 	current->lockdep_recursion = 1;
 	check_flags(flags);
-	if (__lock_set_subclass(lock, subclass, ip))
+	if (__lock_set_class(lock, name, key, subclass, ip))
 		check_chain_key(current);
 	current->lockdep_recursion = 0;
 	raw_local_irq_restore(flags);
 }
-
-EXPORT_SYMBOL_GPL(lock_set_subclass);
+EXPORT_SYMBOL_GPL(lock_set_class);
 
 /*
  * We are not always called with irqs disabled - do that here,
@@ -2945,7 +2947,6 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
 	current->lockdep_recursion = 0;
 	raw_local_irq_restore(flags);
 }
-
 EXPORT_SYMBOL_GPL(lock_acquire);
 
 void lock_release(struct lockdep_map *lock, int nested,
@@ -2963,7 +2964,6 @@ void lock_release(struct lockdep_map *lock, int nested,
 	current->lockdep_recursion = 0;
 	raw_local_irq_restore(flags);
 }
-
 EXPORT_SYMBOL_GPL(lock_release);
 
 #ifdef CONFIG_LOCK_STAT
@@ -3001,7 +3001,7 @@ __lock_contended(struct lockdep_map *lock, unsigned long ip)
 	struct held_lock *hlock, *prev_hlock;
 	struct lock_class_stats *stats;
 	unsigned int depth;
-	int i, point;
+	int i, contention_point, contending_point;
 
 	depth = curr->lockdep_depth;
 	if (DEBUG_LOCKS_WARN_ON(!depth))
@@ -3025,18 +3025,22 @@ __lock_contended(struct lockdep_map *lock, unsigned long ip)
 found_it:
 	hlock->waittime_stamp = sched_clock();
 
-	point = lock_contention_point(hlock_class(hlock), ip);
+	contention_point = lock_point(hlock_class(hlock)->contention_point, ip);
+	contending_point = lock_point(hlock_class(hlock)->contending_point,
+				      lock->ip);
 
 	stats = get_lock_stats(hlock_class(hlock));
-	if (point < ARRAY_SIZE(stats->contention_point))
-		stats->contention_point[point]++;
+	if (contention_point < LOCKSTAT_POINTS)
+		stats->contention_point[contention_point]++;
+	if (contending_point < LOCKSTAT_POINTS)
+		stats->contending_point[contending_point]++;
 	if (lock->cpu != smp_processor_id())
 		stats->bounces[bounce_contended + !!hlock->read]++;
 	put_lock_stats(stats);
 }
 
 static void
-__lock_acquired(struct lockdep_map *lock)
+__lock_acquired(struct lockdep_map *lock, unsigned long ip)
 {
 	struct task_struct *curr = current;
 	struct held_lock *hlock, *prev_hlock;
@@ -3085,6 +3089,7 @@ found_it:
 	put_lock_stats(stats);
 
 	lock->cpu = cpu;
+	lock->ip = ip;
 }
 
 void lock_contended(struct lockdep_map *lock, unsigned long ip)
@@ -3106,7 +3111,7 @@ void lock_contended(struct lockdep_map *lock, unsigned long ip)
 }
 EXPORT_SYMBOL_GPL(lock_contended);
 
-void lock_acquired(struct lockdep_map *lock)
+void lock_acquired(struct lockdep_map *lock, unsigned long ip)
 {
 	unsigned long flags;
 
@@ -3119,7 +3124,7 @@ void lock_acquired(struct lockdep_map *lock)
 	raw_local_irq_save(flags);
 	check_flags(flags);
 	current->lockdep_recursion = 1;
-	__lock_acquired(lock);
+	__lock_acquired(lock, ip);
 	current->lockdep_recursion = 0;
 	raw_local_irq_restore(flags);
 }
@@ -3278,10 +3283,10 @@ void __init lockdep_info(void)
 {
 	printk("Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar\n");
 
-	printk("... MAX_LOCKDEP_SUBCLASSES:    %lu\n", MAX_LOCKDEP_SUBCLASSES);
+	printk("... MAX_LOCKDEP_SUBCLASSES:  %lu\n", MAX_LOCKDEP_SUBCLASSES);
 	printk("... MAX_LOCK_DEPTH:          %lu\n", MAX_LOCK_DEPTH);
 	printk("... MAX_LOCKDEP_KEYS:        %lu\n", MAX_LOCKDEP_KEYS);
-	printk("... CLASSHASH_SIZE:           %lu\n", CLASSHASH_SIZE);
+	printk("... CLASSHASH_SIZE:          %lu\n", CLASSHASH_SIZE);
 	printk("... MAX_LOCKDEP_ENTRIES:     %lu\n", MAX_LOCKDEP_ENTRIES);
 	printk("... MAX_LOCKDEP_CHAINS:      %lu\n", MAX_LOCKDEP_CHAINS);
 	printk("... CHAINHASH_SIZE:          %lu\n", CHAINHASH_SIZE);
@@ -3417,9 +3422,10 @@ retry:
 		}
 		printk(" ignoring it.\n");
 		unlock = 0;
+	} else {
+		if (count != 10)
+			printk(KERN_CONT " locked it.\n");
 	}
-	if (count != 10)
-		printk(" locked it.\n");
 
 	do_each_thread(g, p) {
 		/*
@@ -3442,7 +3448,6 @@ retry:
 	if (unlock)
 		read_unlock(&tasklist_lock);
 }
-
 EXPORT_SYMBOL_GPL(debug_show_all_locks);
 
 /*
@@ -3463,7 +3468,6 @@ void debug_show_held_locks(struct task_struct *task)
 {
 		__debug_show_held_locks(task);
 }
-
 EXPORT_SYMBOL_GPL(debug_show_held_locks);
 
 void lockdep_sys_exit(void)
diff --git a/kernel/lockdep_proc.c b/kernel/lockdep_proc.c
index 20dbcbf9c7dd..13716b813896 100644
--- a/kernel/lockdep_proc.c
+++ b/kernel/lockdep_proc.c
@@ -470,11 +470,12 @@ static void seq_line(struct seq_file *m, char c, int offset, int length)
 
 static void snprint_time(char *buf, size_t bufsiz, s64 nr)
 {
-	unsigned long rem;
+	s64 div;
+	s32 rem;
 
 	nr += 5; /* for display rounding */
-	rem = do_div(nr, 1000); /* XXX: do_div_signed */
-	snprintf(buf, bufsiz, "%lld.%02d", (long long)nr, (int)rem/10);
+	div = div_s64_rem(nr, 1000, &rem);
+	snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);
 }
 
 static void seq_time(struct seq_file *m, s64 time)
@@ -556,7 +557,7 @@ static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
 	if (stats->read_holdtime.nr)
 		namelen += 2;
 
-	for (i = 0; i < ARRAY_SIZE(class->contention_point); i++) {
+	for (i = 0; i < LOCKSTAT_POINTS; i++) {
 		char sym[KSYM_SYMBOL_LEN];
 		char ip[32];
 
@@ -573,6 +574,23 @@ static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
 				stats->contention_point[i],
 				ip, sym);
 	}
+	for (i = 0; i < LOCKSTAT_POINTS; i++) {
+		char sym[KSYM_SYMBOL_LEN];
+		char ip[32];
+
+		if (class->contending_point[i] == 0)
+			break;
+
+		if (!i)
+			seq_line(m, '-', 40-namelen, namelen);
+
+		sprint_symbol(sym, class->contending_point[i]);
+		snprintf(ip, sizeof(ip), "[<%p>]",
+				(void *)class->contending_point[i]);
+		seq_printf(m, "%40s %14lu %29s %s\n", name,
+				stats->contending_point[i],
+				ip, sym);
+	}
 	if (i) {
 		seq_puts(m, "\n");
 		seq_line(m, '.', 0, 40 + 1 + 10 * (14 + 1));
@@ -582,7 +600,7 @@ static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
 
 static void seq_header(struct seq_file *m)
 {
-	seq_printf(m, "lock_stat version 0.2\n");
+	seq_printf(m, "lock_stat version 0.3\n");
 	seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1));
 	seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s "
 			"%14s %14s\n",
diff --git a/kernel/marker.c b/kernel/marker.c
index 7d1faecd7a51..ea54f2647868 100644
--- a/kernel/marker.c
+++ b/kernel/marker.c
@@ -43,6 +43,7 @@ static DEFINE_MUTEX(markers_mutex);
  */
 #define MARKER_HASH_BITS 6
 #define MARKER_TABLE_SIZE (1 << MARKER_HASH_BITS)
+static struct hlist_head marker_table[MARKER_TABLE_SIZE];
 
 /*
  * Note about RCU :
@@ -62,13 +63,12 @@ struct marker_entry {
 	int refcount;	/* Number of times armed. 0 if disarmed. */
 	struct rcu_head rcu;
 	void *oldptr;
-	unsigned char rcu_pending:1;
+	int rcu_pending;
 	unsigned char ptype:1;
+	unsigned char format_allocated:1;
 	char name[0];	/* Contains name'\0'format'\0' */
 };
 
-static struct hlist_head marker_table[MARKER_TABLE_SIZE];
-
 /**
  * __mark_empty_function - Empty probe callback
  * @probe_private: probe private data
@@ -81,7 +81,7 @@ static struct hlist_head marker_table[MARKER_TABLE_SIZE];
  * though the function pointer change and the marker enabling are two distinct
  * operations that modifies the execution flow of preemptible code.
  */
-void __mark_empty_function(void *probe_private, void *call_private,
+notrace void __mark_empty_function(void *probe_private, void *call_private,
 	const char *fmt, va_list *args)
 {
 }
@@ -97,17 +97,18 @@ EXPORT_SYMBOL_GPL(__mark_empty_function);
  * need to put a full smp_rmb() in this branch. This is why we do not use
  * rcu_dereference() for the pointer read.
  */
-void marker_probe_cb(const struct marker *mdata, void *call_private, ...)
+notrace void marker_probe_cb(const struct marker *mdata,
+		void *call_private, ...)
 {
 	va_list args;
 	char ptype;
 
 	/*
-	 * preempt_disable does two things : disabling preemption to make sure
-	 * the teardown of the callbacks can be done correctly when they are in
-	 * modules and they insure RCU read coherency.
+	 * rcu_read_lock_sched does two things : disabling preemption to make
+	 * sure the teardown of the callbacks can be done correctly when they
+	 * are in modules and they insure RCU read coherency.
 	 */
-	preempt_disable();
+	rcu_read_lock_sched_notrace();
 	ptype = mdata->ptype;
 	if (likely(!ptype)) {
 		marker_probe_func *func;
@@ -145,7 +146,7 @@ void marker_probe_cb(const struct marker *mdata, void *call_private, ...)
 			va_end(args);
 		}
 	}
-	preempt_enable();
+	rcu_read_unlock_sched_notrace();
 }
 EXPORT_SYMBOL_GPL(marker_probe_cb);
 
@@ -157,12 +158,13 @@ EXPORT_SYMBOL_GPL(marker_probe_cb);
  *
  * Should be connected to markers "MARK_NOARGS".
  */
-void marker_probe_cb_noarg(const struct marker *mdata, void *call_private, ...)
+static notrace void marker_probe_cb_noarg(const struct marker *mdata,
+		void *call_private, ...)
 {
 	va_list args;	/* not initialized */
 	char ptype;
 
-	preempt_disable();
+	rcu_read_lock_sched_notrace();
 	ptype = mdata->ptype;
 	if (likely(!ptype)) {
 		marker_probe_func *func;
@@ -195,9 +197,8 @@ void marker_probe_cb_noarg(const struct marker *mdata, void *call_private, ...)
 			multi[i].func(multi[i].probe_private, call_private,
 				mdata->format, &args);
 	}
-	preempt_enable();
+	rcu_read_unlock_sched_notrace();
 }
-EXPORT_SYMBOL_GPL(marker_probe_cb_noarg);
 
 static void free_old_closure(struct rcu_head *head)
 {
@@ -416,6 +417,7 @@ static struct marker_entry *add_marker(const char *name, const char *format)
 	e->single.probe_private = NULL;
 	e->multi = NULL;
 	e->ptype = 0;
+	e->format_allocated = 0;
 	e->refcount = 0;
 	e->rcu_pending = 0;
 	hlist_add_head(&e->hlist, head);
@@ -447,6 +449,8 @@ static int remove_marker(const char *name)
 	if (e->single.func != __mark_empty_function)
 		return -EBUSY;
 	hlist_del(&e->hlist);
+	if (e->format_allocated)
+		kfree(e->format);
 	/* Make sure the call_rcu has been executed */
 	if (e->rcu_pending)
 		rcu_barrier_sched();
@@ -457,57 +461,34 @@ static int remove_marker(const char *name)
 /*
  * Set the mark_entry format to the format found in the element.
  */
-static int marker_set_format(struct marker_entry **entry, const char *format)
+static int marker_set_format(struct marker_entry *entry, const char *format)
 {
-	struct marker_entry *e;
-	size_t name_len = strlen((*entry)->name) + 1;
-	size_t format_len = strlen(format) + 1;
-
-
-	e = kmalloc(sizeof(struct marker_entry) + name_len + format_len,
-			GFP_KERNEL);
-	if (!e)
+	entry->format = kstrdup(format, GFP_KERNEL);
+	if (!entry->format)
 		return -ENOMEM;
-	memcpy(&e->name[0], (*entry)->name, name_len);
-	e->format = &e->name[name_len];
-	memcpy(e->format, format, format_len);
-	if (strcmp(e->format, MARK_NOARGS) == 0)
-		e->call = marker_probe_cb_noarg;
-	else
-		e->call = marker_probe_cb;
-	e->single = (*entry)->single;
-	e->multi = (*entry)->multi;
-	e->ptype = (*entry)->ptype;
-	e->refcount = (*entry)->refcount;
-	e->rcu_pending = 0;
-	hlist_add_before(&e->hlist, &(*entry)->hlist);
-	hlist_del(&(*entry)->hlist);
-	/* Make sure the call_rcu has been executed */
-	if ((*entry)->rcu_pending)
-		rcu_barrier_sched();
-	kfree(*entry);
-	*entry = e;
+	entry->format_allocated = 1;
+
 	trace_mark(core_marker_format, "name %s format %s",
-			e->name, e->format);
+			entry->name, entry->format);
 	return 0;
 }
 
 /*
  * Sets the probe callback corresponding to one marker.
  */
-static int set_marker(struct marker_entry **entry, struct marker *elem,
+static int set_marker(struct marker_entry *entry, struct marker *elem,
 		int active)
 {
-	int ret;
-	WARN_ON(strcmp((*entry)->name, elem->name) != 0);
+	int ret = 0;
+	WARN_ON(strcmp(entry->name, elem->name) != 0);
 
-	if ((*entry)->format) {
-		if (strcmp((*entry)->format, elem->format) != 0) {
+	if (entry->format) {
+		if (strcmp(entry->format, elem->format) != 0) {
 			printk(KERN_NOTICE
 				"Format mismatch for probe %s "
 				"(%s), marker (%s)\n",
-				(*entry)->name,
-				(*entry)->format,
+				entry->name,
+				entry->format,
 				elem->format);
 			return -EPERM;
 		}
@@ -523,48 +504,95 @@ static int set_marker(struct marker_entry **entry, struct marker *elem,
 	 * pass from a "safe" callback (with argument) to an "unsafe"
 	 * callback (does not set arguments).
 	 */
-	elem->call = (*entry)->call;
+	elem->call = entry->call;
 	/*
 	 * Sanity check :
 	 * We only update the single probe private data when the ptr is
 	 * set to a _non_ single probe! (0 -> 1 and N -> 1, N != 1)
 	 */
 	WARN_ON(elem->single.func != __mark_empty_function
-		&& elem->single.probe_private
-		!= (*entry)->single.probe_private &&
-		!elem->ptype);
-	elem->single.probe_private = (*entry)->single.probe_private;
+		&& elem->single.probe_private != entry->single.probe_private
+		&& !elem->ptype);
+	elem->single.probe_private = entry->single.probe_private;
 	/*
 	 * Make sure the private data is valid when we update the
 	 * single probe ptr.
 	 */
 	smp_wmb();
-	elem->single.func = (*entry)->single.func;
+	elem->single.func = entry->single.func;
 	/*
 	 * We also make sure that the new probe callbacks array is consistent
 	 * before setting a pointer to it.
 	 */
-	rcu_assign_pointer(elem->multi, (*entry)->multi);
+	rcu_assign_pointer(elem->multi, entry->multi);
 	/*
 	 * Update the function or multi probe array pointer before setting the
 	 * ptype.
 	 */
 	smp_wmb();
-	elem->ptype = (*entry)->ptype;
+	elem->ptype = entry->ptype;
+
+	if (elem->tp_name && (active ^ elem->state)) {
+		WARN_ON(!elem->tp_cb);
+		/*
+		 * It is ok to directly call the probe registration because type
+		 * checking has been done in the __trace_mark_tp() macro.
+		 */
+
+		if (active) {
+			/*
+			 * try_module_get should always succeed because we hold
+			 * lock_module() to get the tp_cb address.
+			 */
+			ret = try_module_get(__module_text_address(
+				(unsigned long)elem->tp_cb));
+			BUG_ON(!ret);
+			ret = tracepoint_probe_register_noupdate(
+				elem->tp_name,
+				elem->tp_cb);
+		} else {
+			ret = tracepoint_probe_unregister_noupdate(
+				elem->tp_name,
+				elem->tp_cb);
+			/*
+			 * tracepoint_probe_update_all() must be called
+			 * before the module containing tp_cb is unloaded.
+			 */
+			module_put(__module_text_address(
+				(unsigned long)elem->tp_cb));
+		}
+	}
 	elem->state = active;
 
-	return 0;
+	return ret;
 }
 
 /*
  * Disable a marker and its probe callback.
  * Note: only waiting an RCU period after setting elem->call to the empty
  * function insures that the original callback is not used anymore. This insured
- * by preempt_disable around the call site.
+ * by rcu_read_lock_sched around the call site.
  */
 static void disable_marker(struct marker *elem)
 {
+	int ret;
+
 	/* leave "call" as is. It is known statically. */
+	if (elem->tp_name && elem->state) {
+		WARN_ON(!elem->tp_cb);
+		/*
+		 * It is ok to directly call the probe registration because type
+		 * checking has been done in the __trace_mark_tp() macro.
+		 */
+		ret = tracepoint_probe_unregister_noupdate(elem->tp_name,
+			elem->tp_cb);
+		WARN_ON(ret);
+		/*
+		 * tracepoint_probe_update_all() must be called
+		 * before the module containing tp_cb is unloaded.
+		 */
+		module_put(__module_text_address((unsigned long)elem->tp_cb));
+	}
 	elem->state = 0;
 	elem->single.func = __mark_empty_function;
 	/* Update the function before setting the ptype */
@@ -594,8 +622,7 @@ void marker_update_probe_range(struct marker *begin,
 	for (iter = begin; iter < end; iter++) {
 		mark_entry = get_marker(iter->name);
 		if (mark_entry) {
-			set_marker(&mark_entry, iter,
-					!!mark_entry->refcount);
+			set_marker(mark_entry, iter, !!mark_entry->refcount);
 			/*
 			 * ignore error, continue
 			 */
@@ -629,6 +656,7 @@ static void marker_update_probes(void)
 	marker_update_probe_range(__start___markers, __stop___markers);
 	/* Markers in modules. */
 	module_update_markers();
+	tracepoint_probe_update_all();
 }
 
 /**
@@ -653,11 +681,17 @@ int marker_probe_register(const char *name, const char *format,
 	entry = get_marker(name);
 	if (!entry) {
 		entry = add_marker(name, format);
-		if (IS_ERR(entry)) {
+		if (IS_ERR(entry))
 			ret = PTR_ERR(entry);
-			goto end;
-		}
+	} else if (format) {
+		if (!entry->format)
+			ret = marker_set_format(entry, format);
+		else if (strcmp(entry->format, format))
+			ret = -EPERM;
 	}
+	if (ret)
+		goto end;
+
 	/*
 	 * If we detect that a call_rcu is pending for this marker,
 	 * make sure it's executed now.
@@ -670,10 +704,13 @@ int marker_probe_register(const char *name, const char *format,
 		goto end;
 	}
 	mutex_unlock(&markers_mutex);
-	marker_update_probes();		/* may update entry */
+	marker_update_probes();
 	mutex_lock(&markers_mutex);
 	entry = get_marker(name);
-	WARN_ON(!entry);
+	if (!entry)
+		goto end;
+	if (entry->rcu_pending)
+		rcu_barrier_sched();
 	entry->oldptr = old;
 	entry->rcu_pending = 1;
 	/* write rcu_pending before calling the RCU callback */
@@ -712,11 +749,13 @@ int marker_probe_unregister(const char *name,
 		rcu_barrier_sched();
 	old = marker_entry_remove_probe(entry, probe, probe_private);
 	mutex_unlock(&markers_mutex);
-	marker_update_probes();		/* may update entry */
+	marker_update_probes();
 	mutex_lock(&markers_mutex);
 	entry = get_marker(name);
 	if (!entry)
 		goto end;
+	if (entry->rcu_pending)
+		rcu_barrier_sched();
 	entry->oldptr = old;
 	entry->rcu_pending = 1;
 	/* write rcu_pending before calling the RCU callback */
@@ -791,10 +830,13 @@ int marker_probe_unregister_private_data(marker_probe_func *probe,
 		rcu_barrier_sched();
 	old = marker_entry_remove_probe(entry, NULL, probe_private);
 	mutex_unlock(&markers_mutex);
-	marker_update_probes();		/* may update entry */
+	marker_update_probes();
 	mutex_lock(&markers_mutex);
 	entry = get_marker_from_private_data(probe, probe_private);
-	WARN_ON(!entry);
+	if (!entry)
+		goto end;
+	if (entry->rcu_pending)
+		rcu_barrier_sched();
 	entry->oldptr = old;
 	entry->rcu_pending = 1;
 	/* write rcu_pending before calling the RCU callback */
@@ -836,8 +878,6 @@ void *marker_get_private_data(const char *name, marker_probe_func *probe,
 			if (!e->ptype) {
 				if (num == 0 && e->single.func == probe)
 					return e->single.probe_private;
-				else
-					break;
 			} else {
 				struct marker_probe_closure *closure;
 				int match = 0;
@@ -849,8 +889,42 @@ void *marker_get_private_data(const char *name, marker_probe_func *probe,
 						return closure[i].probe_private;
 				}
 			}
+			break;
 		}
 	}
 	return ERR_PTR(-ENOENT);
 }
 EXPORT_SYMBOL_GPL(marker_get_private_data);
+
+#ifdef CONFIG_MODULES
+
+int marker_module_notify(struct notifier_block *self,
+			 unsigned long val, void *data)
+{
+	struct module *mod = data;
+
+	switch (val) {
+	case MODULE_STATE_COMING:
+		marker_update_probe_range(mod->markers,
+			mod->markers + mod->num_markers);
+		break;
+	case MODULE_STATE_GOING:
+		marker_update_probe_range(mod->markers,
+			mod->markers + mod->num_markers);
+		break;
+	}
+	return 0;
+}
+
+struct notifier_block marker_module_nb = {
+	.notifier_call = marker_module_notify,
+	.priority = 0,
+};
+
+static int init_markers(void)
+{
+	return register_module_notifier(&marker_module_nb);
+}
+__initcall(init_markers);
+
+#endif /* CONFIG_MODULES */
diff --git a/kernel/module.c b/kernel/module.c
index 9db11911e04b..dd2a54155b54 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -20,11 +20,13 @@
 #include <linux/moduleloader.h>
 #include <linux/init.h>
 #include <linux/kallsyms.h>
+#include <linux/fs.h>
 #include <linux/sysfs.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/elf.h>
+#include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/syscalls.h>
 #include <linux/fcntl.h>
@@ -42,10 +44,13 @@
 #include <linux/string.h>
 #include <linux/mutex.h>
 #include <linux/unwind.h>
+#include <linux/rculist.h>
 #include <asm/uaccess.h>
 #include <asm/cacheflush.h>
 #include <linux/license.h>
 #include <asm/sections.h>
+#include <linux/tracepoint.h>
+#include <linux/ftrace.h>
 
 #if 0
 #define DEBUGP printk
@@ -61,7 +66,7 @@
 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
 
 /* List of modules, protected by module_mutex or preempt_disable
- * (add/delete uses stop_machine). */
+ * (delete uses stop_machine/add uses RCU list operations). */
 static DEFINE_MUTEX(module_mutex);
 static LIST_HEAD(modules);
 
@@ -100,7 +105,7 @@ static inline int strong_try_module_get(struct module *mod)
 static inline void add_taint_module(struct module *mod, unsigned flag)
 {
 	add_taint(flag);
-	mod->taints |= flag;
+	mod->taints |= (1U << flag);
 }
 
 /*
@@ -130,6 +135,29 @@ static unsigned int find_sec(Elf_Ehdr *hdr,
 	return 0;
 }
 
+/* Find a module section, or NULL. */
+static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
+			  const char *secstrings, const char *name)
+{
+	/* Section 0 has sh_addr 0. */
+	return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
+}
+
+/* Find a module section, or NULL.  Fill in number of "objects" in section. */
+static void *section_objs(Elf_Ehdr *hdr,
+			  Elf_Shdr *sechdrs,
+			  const char *secstrings,
+			  const char *name,
+			  size_t object_size,
+			  unsigned int *num)
+{
+	unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
+
+	/* Section 0 has sh_addr 0 and sh_size 0. */
+	*num = sechdrs[sec].sh_size / object_size;
+	return (void *)sechdrs[sec].sh_addr;
+}
+
 /* Provided by the linker */
 extern const struct kernel_symbol __start___ksymtab[];
 extern const struct kernel_symbol __stop___ksymtab[];
@@ -216,7 +244,7 @@ static bool each_symbol(bool (*fn)(const struct symsearch *arr,
 	if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
 		return true;
 
-	list_for_each_entry(mod, &modules, list) {
+	list_for_each_entry_rcu(mod, &modules, list) {
 		struct symsearch arr[] = {
 			{ mod->syms, mod->syms + mod->num_syms, mod->crcs,
 			  NOT_GPL_ONLY, false },
@@ -784,6 +812,7 @@ sys_delete_module(const char __user *name_user, unsigned int flags)
 	mutex_lock(&module_mutex);
 	/* Store the name of the last unloaded module for diagnostic purposes */
 	strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
+	unregister_dynamic_debug_module(mod->name);
 	free_module(mod);
 
  out:
@@ -923,7 +952,7 @@ static const char vermagic[] = VERMAGIC_STRING;
 static int try_to_force_load(struct module *mod, const char *symname)
 {
 #ifdef CONFIG_MODULE_FORCE_LOAD
-	if (!(tainted & TAINT_FORCED_MODULE))
+	if (!test_taint(TAINT_FORCED_MODULE))
 		printk("%s: no version for \"%s\" found: kernel tainted.\n",
 		       mod->name, symname);
 	add_taint_module(mod, TAINT_FORCED_MODULE);
@@ -1033,7 +1062,7 @@ static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
 	const unsigned long *crc;
 
 	ret = find_symbol(name, &owner, &crc,
-			  !(mod->taints & TAINT_PROPRIETARY_MODULE), true);
+			  !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
 	if (!IS_ERR_VALUE(ret)) {
 		/* use_module can fail due to OOM,
 		   or module initialization or unloading */
@@ -1173,7 +1202,7 @@ static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
 		while (i-- > 0)
 			sysfs_remove_bin_file(notes_attrs->dir,
 					      &notes_attrs->attrs[i]);
-		kobject_del(notes_attrs->dir);
+		kobject_put(notes_attrs->dir);
 	}
 	kfree(notes_attrs);
 }
@@ -1391,17 +1420,6 @@ static void mod_kobject_remove(struct module *mod)
 }
 
 /*
- * link the module with the whole machine is stopped with interrupts off
- * - this defends against kallsyms not taking locks
- */
-static int __link_module(void *_mod)
-{
-	struct module *mod = _mod;
-	list_add(&mod->list, &modules);
-	return 0;
-}
-
-/*
  * unlink the module with the whole machine is stopped with interrupts off
  * - this defends against kallsyms not taking locks
  */
@@ -1429,6 +1447,9 @@ static void free_module(struct module *mod)
 	/* Module unload stuff */
 	module_unload_free(mod);
 
+	/* release any pointers to mcount in this module */
+	ftrace_release(mod->module_core, mod->core_size);
+
 	/* This may be NULL, but that's OK */
 	module_free(mod, mod->module_init);
 	kfree(mod->args);
@@ -1634,7 +1655,7 @@ static void set_license(struct module *mod, const char *license)
 		license = "unspecified";
 
 	if (!license_is_gpl_compatible(license)) {
-		if (!(tainted & TAINT_PROPRIETARY_MODULE))
+		if (!test_taint(TAINT_PROPRIETARY_MODULE))
 			printk(KERN_WARNING "%s: module license '%s' taints "
 				"kernel.\n", mod->name, license);
 		add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
@@ -1783,6 +1804,21 @@ static inline void add_kallsyms(struct module *mod,
 }
 #endif /* CONFIG_KALLSYMS */
 
+static void dynamic_printk_setup(struct mod_debug *debug, unsigned int num)
+{
+#ifdef CONFIG_DYNAMIC_PRINTK_DEBUG
+	unsigned int i;
+
+	for (i = 0; i < num; i++) {
+		register_dynamic_debug_module(debug[i].modname,
+					      debug[i].type,
+					      debug[i].logical_modname,
+					      debug[i].flag_names,
+					      debug[i].hash, debug[i].hash2);
+	}
+#endif /* CONFIG_DYNAMIC_PRINTK_DEBUG */
+}
+
 static void *module_alloc_update_bounds(unsigned long size)
 {
 	void *ret = module_alloc(size);
@@ -1806,35 +1842,18 @@ static noinline struct module *load_module(void __user *umod,
 	Elf_Ehdr *hdr;
 	Elf_Shdr *sechdrs;
 	char *secstrings, *args, *modmagic, *strtab = NULL;
+	char *staging;
 	unsigned int i;
 	unsigned int symindex = 0;
 	unsigned int strindex = 0;
-	unsigned int setupindex;
-	unsigned int exindex;
-	unsigned int exportindex;
-	unsigned int modindex;
-	unsigned int obsparmindex;
-	unsigned int infoindex;
-	unsigned int gplindex;
-	unsigned int crcindex;
-	unsigned int gplcrcindex;
-	unsigned int versindex;
-	unsigned int pcpuindex;
-	unsigned int gplfutureindex;
-	unsigned int gplfuturecrcindex;
+	unsigned int modindex, versindex, infoindex, pcpuindex;
 	unsigned int unwindex = 0;
-#ifdef CONFIG_UNUSED_SYMBOLS
-	unsigned int unusedindex;
-	unsigned int unusedcrcindex;
-	unsigned int unusedgplindex;
-	unsigned int unusedgplcrcindex;
-#endif
-	unsigned int markersindex;
-	unsigned int markersstringsindex;
+	unsigned int num_kp, num_mcount;
+	struct kernel_param *kp;
 	struct module *mod;
 	long err = 0;
 	void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
-	struct exception_table_entry *extable;
+	unsigned long *mseg;
 	mm_segment_t old_fs;
 
 	DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
@@ -1898,6 +1917,7 @@ static noinline struct module *load_module(void __user *umod,
 		err = -ENOEXEC;
 		goto free_hdr;
 	}
+	/* This is temporary: point mod into copy of data. */
 	mod = (void *)sechdrs[modindex].sh_addr;
 
 	if (symindex == 0) {
@@ -1907,22 +1927,6 @@ static noinline struct module *load_module(void __user *umod,
 		goto free_hdr;
 	}
 
-	/* Optional sections */
-	exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
-	gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
-	gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
-	crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
-	gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
-	gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
-#ifdef CONFIG_UNUSED_SYMBOLS
-	unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused");
-	unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl");
-	unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused");
-	unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl");
-#endif
-	setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
-	exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
-	obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
 	versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
 	infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
 	pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
@@ -1960,6 +1964,14 @@ static noinline struct module *load_module(void __user *umod,
 		goto free_hdr;
 	}
 
+	staging = get_modinfo(sechdrs, infoindex, "staging");
+	if (staging) {
+		add_taint_module(mod, TAINT_CRAP);
+		printk(KERN_WARNING "%s: module is from the staging directory,"
+		       " the quality is unknown, you have been warned.\n",
+		       mod->name);
+	}
+
 	/* Now copy in args */
 	args = strndup_user(uargs, ~0UL >> 1);
 	if (IS_ERR(args)) {
@@ -2070,42 +2082,57 @@ static noinline struct module *load_module(void __user *umod,
 	if (err < 0)
 		goto cleanup;
 
-	/* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
-	mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
-	mod->syms = (void *)sechdrs[exportindex].sh_addr;
-	if (crcindex)
-		mod->crcs = (void *)sechdrs[crcindex].sh_addr;
-	mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
-	mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
-	if (gplcrcindex)
-		mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
-	mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size /
-					sizeof(*mod->gpl_future_syms);
-	mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
-	if (gplfuturecrcindex)
-		mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
+	/* Now we've got everything in the final locations, we can
+	 * find optional sections. */
+	kp = section_objs(hdr, sechdrs, secstrings, "__param", sizeof(*kp),
+			  &num_kp);
+	mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
+				 sizeof(*mod->syms), &mod->num_syms);
+	mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
+	mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
+				     sizeof(*mod->gpl_syms),
+				     &mod->num_gpl_syms);
+	mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
+	mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
+					    "__ksymtab_gpl_future",
+					    sizeof(*mod->gpl_future_syms),
+					    &mod->num_gpl_future_syms);
+	mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
+					    "__kcrctab_gpl_future");
 
 #ifdef CONFIG_UNUSED_SYMBOLS
-	mod->num_unused_syms = sechdrs[unusedindex].sh_size /
-					sizeof(*mod->unused_syms);
-	mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size /
-					sizeof(*mod->unused_gpl_syms);
-	mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr;
-	if (unusedcrcindex)
-		mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr;
-	mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr;
-	if (unusedgplcrcindex)
-		mod->unused_gpl_crcs
-			= (void *)sechdrs[unusedgplcrcindex].sh_addr;
+	mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
+					"__ksymtab_unused",
+					sizeof(*mod->unused_syms),
+					&mod->num_unused_syms);
+	mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
+					"__kcrctab_unused");
+	mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
+					    "__ksymtab_unused_gpl",
+					    sizeof(*mod->unused_gpl_syms),
+					    &mod->num_unused_gpl_syms);
+	mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
+					    "__kcrctab_unused_gpl");
+#endif
+
+#ifdef CONFIG_MARKERS
+	mod->markers = section_objs(hdr, sechdrs, secstrings, "__markers",
+				    sizeof(*mod->markers), &mod->num_markers);
+#endif
+#ifdef CONFIG_TRACEPOINTS
+	mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
+					"__tracepoints",
+					sizeof(*mod->tracepoints),
+					&mod->num_tracepoints);
 #endif
 
 #ifdef CONFIG_MODVERSIONS
-	if ((mod->num_syms && !crcindex)
-	    || (mod->num_gpl_syms && !gplcrcindex)
-	    || (mod->num_gpl_future_syms && !gplfuturecrcindex)
+	if ((mod->num_syms && !mod->crcs)
+	    || (mod->num_gpl_syms && !mod->gpl_crcs)
+	    || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
 #ifdef CONFIG_UNUSED_SYMBOLS
-	    || (mod->num_unused_syms && !unusedcrcindex)
-	    || (mod->num_unused_gpl_syms && !unusedgplcrcindex)
+	    || (mod->num_unused_syms && !mod->unused_crcs)
+	    || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
 #endif
 		) {
 		printk(KERN_WARNING "%s: No versions for exported symbols.\n", mod->name);
@@ -2114,9 +2141,6 @@ static noinline struct module *load_module(void __user *umod,
 			goto cleanup;
 	}
 #endif
-	markersindex = find_sec(hdr, sechdrs, secstrings, "__markers");
- 	markersstringsindex = find_sec(hdr, sechdrs, secstrings,
-					"__markers_strings");
 
 	/* Now do relocations. */
 	for (i = 1; i < hdr->e_shnum; i++) {
@@ -2139,22 +2163,16 @@ static noinline struct module *load_module(void __user *umod,
 		if (err < 0)
 			goto cleanup;
 	}
-#ifdef CONFIG_MARKERS
-	mod->markers = (void *)sechdrs[markersindex].sh_addr;
-	mod->num_markers =
-		sechdrs[markersindex].sh_size / sizeof(*mod->markers);
-#endif
 
         /* Find duplicate symbols */
 	err = verify_export_symbols(mod);
-
 	if (err < 0)
 		goto cleanup;
 
   	/* Set up and sort exception table */
-	mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
-	mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
-	sort_extable(extable, extable + mod->num_exentries);
+	mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
+				    sizeof(*mod->extable), &mod->num_exentries);
+	sort_extable(mod->extable, mod->extable + mod->num_exentries);
 
 	/* Finally, copy percpu area over. */
 	percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
@@ -2162,11 +2180,20 @@ static noinline struct module *load_module(void __user *umod,
 
 	add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
 
-#ifdef CONFIG_MARKERS
-	if (!mod->taints)
-		marker_update_probe_range(mod->markers,
-			mod->markers + mod->num_markers);
-#endif
+	if (!mod->taints) {
+		struct mod_debug *debug;
+		unsigned int num_debug;
+
+		debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
+				     sizeof(*debug), &num_debug);
+		dynamic_printk_setup(debug, num_debug);
+	}
+
+	/* sechdrs[0].sh_size is always zero */
+	mseg = section_objs(hdr, sechdrs, secstrings, "__mcount_loc",
+			    sizeof(*mseg), &num_mcount);
+	ftrace_init_module(mod, mseg, mseg + num_mcount);
+
 	err = module_finalize(hdr, sechdrs, mod);
 	if (err < 0)
 		goto cleanup;
@@ -2190,30 +2217,24 @@ static noinline struct module *load_module(void __user *umod,
 	set_fs(old_fs);
 
 	mod->args = args;
-	if (obsparmindex)
+	if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
 		printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
 		       mod->name);
 
 	/* Now sew it into the lists so we can get lockdep and oops
-         * info during argument parsing.  Noone should access us, since
-         * strong_try_module_get() will fail. */
-	stop_machine(__link_module, mod, NULL);
-
-	/* Size of section 0 is 0, so this works well if no params */
-	err = parse_args(mod->name, mod->args,
-			 (struct kernel_param *)
-			 sechdrs[setupindex].sh_addr,
-			 sechdrs[setupindex].sh_size
-			 / sizeof(struct kernel_param),
-			 NULL);
+	 * info during argument parsing.  Noone should access us, since
+	 * strong_try_module_get() will fail.
+	 * lockdep/oops can run asynchronous, so use the RCU list insertion
+	 * function to insert in a way safe to concurrent readers.
+	 * The mutex protects against concurrent writers.
+	 */
+	list_add_rcu(&mod->list, &modules);
+
+	err = parse_args(mod->name, mod->args, kp, num_kp, NULL);
 	if (err < 0)
 		goto unlink;
 
-	err = mod_sysfs_setup(mod,
-			      (struct kernel_param *)
-			      sechdrs[setupindex].sh_addr,
-			      sechdrs[setupindex].sh_size
-			      / sizeof(struct kernel_param));
+	err = mod_sysfs_setup(mod, kp, num_kp);
 	if (err < 0)
 		goto unlink;
 	add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
@@ -2236,6 +2257,7 @@ static noinline struct module *load_module(void __user *umod,
  cleanup:
 	kobject_del(&mod->mkobj.kobj);
 	kobject_put(&mod->mkobj.kobj);
+	ftrace_release(mod->module_core, mod->core_size);
  free_unload:
 	module_unload_free(mod);
 	module_free(mod, mod->module_init);
@@ -2401,7 +2423,7 @@ const char *module_address_lookup(unsigned long addr,
 	const char *ret = NULL;
 
 	preempt_disable();
-	list_for_each_entry(mod, &modules, list) {
+	list_for_each_entry_rcu(mod, &modules, list) {
 		if (within(addr, mod->module_init, mod->init_size)
 		    || within(addr, mod->module_core, mod->core_size)) {
 			if (modname)
@@ -2424,7 +2446,7 @@ int lookup_module_symbol_name(unsigned long addr, char *symname)
 	struct module *mod;
 
 	preempt_disable();
-	list_for_each_entry(mod, &modules, list) {
+	list_for_each_entry_rcu(mod, &modules, list) {
 		if (within(addr, mod->module_init, mod->init_size) ||
 		    within(addr, mod->module_core, mod->core_size)) {
 			const char *sym;
@@ -2448,7 +2470,7 @@ int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
 	struct module *mod;
 
 	preempt_disable();
-	list_for_each_entry(mod, &modules, list) {
+	list_for_each_entry_rcu(mod, &modules, list) {
 		if (within(addr, mod->module_init, mod->init_size) ||
 		    within(addr, mod->module_core, mod->core_size)) {
 			const char *sym;
@@ -2475,7 +2497,7 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 	struct module *mod;
 
 	preempt_disable();
-	list_for_each_entry(mod, &modules, list) {
+	list_for_each_entry_rcu(mod, &modules, list) {
 		if (symnum < mod->num_symtab) {
 			*value = mod->symtab[symnum].st_value;
 			*type = mod->symtab[symnum].st_info;
@@ -2518,7 +2540,7 @@ unsigned long module_kallsyms_lookup_name(const char *name)
 			ret = mod_find_symname(mod, colon+1);
 		*colon = ':';
 	} else {
-		list_for_each_entry(mod, &modules, list)
+		list_for_each_entry_rcu(mod, &modules, list)
 			if ((ret = mod_find_symname(mod, name)) != 0)
 				break;
 	}
@@ -2527,23 +2549,6 @@ unsigned long module_kallsyms_lookup_name(const char *name)
 }
 #endif /* CONFIG_KALLSYMS */
 
-/* Called by the /proc file system to return a list of modules. */
-static void *m_start(struct seq_file *m, loff_t *pos)
-{
-	mutex_lock(&module_mutex);
-	return seq_list_start(&modules, *pos);
-}
-
-static void *m_next(struct seq_file *m, void *p, loff_t *pos)
-{
-	return seq_list_next(p, &modules, pos);
-}
-
-static void m_stop(struct seq_file *m, void *p)
-{
-	mutex_unlock(&module_mutex);
-}
-
 static char *module_flags(struct module *mod, char *buf)
 {
 	int bx = 0;
@@ -2552,10 +2557,12 @@ static char *module_flags(struct module *mod, char *buf)
 	    mod->state == MODULE_STATE_GOING ||
 	    mod->state == MODULE_STATE_COMING) {
 		buf[bx++] = '(';
-		if (mod->taints & TAINT_PROPRIETARY_MODULE)
+		if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
 			buf[bx++] = 'P';
-		if (mod->taints & TAINT_FORCED_MODULE)
+		if (mod->taints & (1 << TAINT_FORCED_MODULE))
 			buf[bx++] = 'F';
+		if (mod->taints & (1 << TAINT_CRAP))
+			buf[bx++] = 'C';
 		/*
 		 * TAINT_FORCED_RMMOD: could be added.
 		 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
@@ -2575,6 +2582,24 @@ static char *module_flags(struct module *mod, char *buf)
 	return buf;
 }
 
+#ifdef CONFIG_PROC_FS
+/* Called by the /proc file system to return a list of modules. */
+static void *m_start(struct seq_file *m, loff_t *pos)
+{
+	mutex_lock(&module_mutex);
+	return seq_list_start(&modules, *pos);
+}
+
+static void *m_next(struct seq_file *m, void *p, loff_t *pos)
+{
+	return seq_list_next(p, &modules, pos);
+}
+
+static void m_stop(struct seq_file *m, void *p)
+{
+	mutex_unlock(&module_mutex);
+}
+
 static int m_show(struct seq_file *m, void *p)
 {
 	struct module *mod = list_entry(p, struct module, list);
@@ -2605,13 +2630,33 @@ static int m_show(struct seq_file *m, void *p)
    Where refcount is a number or -, and deps is a comma-separated list
    of depends or -.
 */
-const struct seq_operations modules_op = {
+static const struct seq_operations modules_op = {
 	.start	= m_start,
 	.next	= m_next,
 	.stop	= m_stop,
 	.show	= m_show
 };
 
+static int modules_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &modules_op);
+}
+
+static const struct file_operations proc_modules_operations = {
+	.open		= modules_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
+
+static int __init proc_modules_init(void)
+{
+	proc_create("modules", 0, NULL, &proc_modules_operations);
+	return 0;
+}
+module_init(proc_modules_init);
+#endif
+
 /* Given an address, look for it in the module exception tables. */
 const struct exception_table_entry *search_module_extables(unsigned long addr)
 {
@@ -2619,7 +2664,7 @@ const struct exception_table_entry *search_module_extables(unsigned long addr)
 	struct module *mod;
 
 	preempt_disable();
-	list_for_each_entry(mod, &modules, list) {
+	list_for_each_entry_rcu(mod, &modules, list) {
 		if (mod->num_exentries == 0)
 			continue;
 
@@ -2645,7 +2690,7 @@ int is_module_address(unsigned long addr)
 
 	preempt_disable();
 
-	list_for_each_entry(mod, &modules, list) {
+	list_for_each_entry_rcu(mod, &modules, list) {
 		if (within(addr, mod->module_core, mod->core_size)) {
 			preempt_enable();
 			return 1;
@@ -2659,14 +2704,14 @@ int is_module_address(unsigned long addr)
 
 
 /* Is this a valid kernel address? */
-struct module *__module_text_address(unsigned long addr)
+__notrace_funcgraph struct module *__module_text_address(unsigned long addr)
 {
 	struct module *mod;
 
 	if (addr < module_addr_min || addr > module_addr_max)
 		return NULL;
 
-	list_for_each_entry(mod, &modules, list)
+	list_for_each_entry_rcu(mod, &modules, list)
 		if (within(addr, mod->module_init, mod->init_text_size)
 		    || within(addr, mod->module_core, mod->core_text_size))
 			return mod;
@@ -2691,8 +2736,11 @@ void print_modules(void)
 	char buf[8];
 
 	printk("Modules linked in:");
-	list_for_each_entry(mod, &modules, list)
+	/* Most callers should already have preempt disabled, but make sure */
+	preempt_disable();
+	list_for_each_entry_rcu(mod, &modules, list)
 		printk(" %s%s", mod->name, module_flags(mod, buf));
+	preempt_enable();
 	if (last_unloaded_module[0])
 		printk(" [last unloaded: %s]", last_unloaded_module);
 	printk("\n");
@@ -2717,3 +2765,50 @@ void module_update_markers(void)
 	mutex_unlock(&module_mutex);
 }
 #endif
+
+#ifdef CONFIG_TRACEPOINTS
+void module_update_tracepoints(void)
+{
+	struct module *mod;
+
+	mutex_lock(&module_mutex);
+	list_for_each_entry(mod, &modules, list)
+		if (!mod->taints)
+			tracepoint_update_probe_range(mod->tracepoints,
+				mod->tracepoints + mod->num_tracepoints);
+	mutex_unlock(&module_mutex);
+}
+
+/*
+ * Returns 0 if current not found.
+ * Returns 1 if current found.
+ */
+int module_get_iter_tracepoints(struct tracepoint_iter *iter)
+{
+	struct module *iter_mod;
+	int found = 0;
+
+	mutex_lock(&module_mutex);
+	list_for_each_entry(iter_mod, &modules, list) {
+		if (!iter_mod->taints) {
+			/*
+			 * Sorted module list
+			 */
+			if (iter_mod < iter->module)
+				continue;
+			else if (iter_mod > iter->module)
+				iter->tracepoint = NULL;
+			found = tracepoint_get_iter_range(&iter->tracepoint,
+				iter_mod->tracepoints,
+				iter_mod->tracepoints
+					+ iter_mod->num_tracepoints);
+			if (found) {
+				iter->module = iter_mod;
+				break;
+			}
+		}
+	}
+	mutex_unlock(&module_mutex);
+	return found;
+}
+#endif
diff --git a/kernel/mutex.c b/kernel/mutex.c
index 12c779dc65d4..4f45d4b658ef 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -59,7 +59,7 @@ EXPORT_SYMBOL(__mutex_init);
  * We also put the fastpath first in the kernel image, to make sure the
  * branch is predicted by the CPU as default-untaken.
  */
-static void noinline __sched
+static __used noinline void __sched
 __mutex_lock_slowpath(atomic_t *lock_count);
 
 /***
@@ -96,7 +96,7 @@ void inline __sched mutex_lock(struct mutex *lock)
 EXPORT_SYMBOL(mutex_lock);
 #endif
 
-static noinline void __sched __mutex_unlock_slowpath(atomic_t *lock_count);
+static __used noinline void __sched __mutex_unlock_slowpath(atomic_t *lock_count);
 
 /***
  * mutex_unlock - release the mutex
@@ -184,7 +184,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
 	}
 
 done:
-	lock_acquired(&lock->dep_map);
+	lock_acquired(&lock->dep_map, ip);
 	/* got the lock - rejoice! */
 	mutex_remove_waiter(lock, &waiter, task_thread_info(task));
 	debug_mutex_set_owner(lock, task_thread_info(task));
@@ -268,7 +268,7 @@ __mutex_unlock_common_slowpath(atomic_t *lock_count, int nested)
 /*
  * Release the lock, slowpath:
  */
-static noinline void
+static __used noinline void
 __mutex_unlock_slowpath(atomic_t *lock_count)
 {
 	__mutex_unlock_common_slowpath(lock_count, 1);
@@ -313,7 +313,7 @@ int __sched mutex_lock_killable(struct mutex *lock)
 }
 EXPORT_SYMBOL(mutex_lock_killable);
 
-static noinline void __sched
+static __used noinline void __sched
 __mutex_lock_slowpath(atomic_t *lock_count)
 {
 	struct mutex *lock = container_of(lock_count, struct mutex, count);
diff --git a/kernel/notifier.c b/kernel/notifier.c
index 823be11584ef..61d5aa5eced3 100644
--- a/kernel/notifier.c
+++ b/kernel/notifier.c
@@ -82,6 +82,14 @@ static int __kprobes notifier_call_chain(struct notifier_block **nl,
 
 	while (nb && nr_to_call) {
 		next_nb = rcu_dereference(nb->next);
+
+#ifdef CONFIG_DEBUG_NOTIFIERS
+		if (unlikely(!func_ptr_is_kernel_text(nb->notifier_call))) {
+			WARN(1, "Invalid notifier called!");
+			nb = next_nb;
+			continue;
+		}
+#endif
 		ret = nb->notifier_call(nb, val, v);
 
 		if (nr_calls)
@@ -550,7 +558,7 @@ EXPORT_SYMBOL(unregister_reboot_notifier);
 
 static ATOMIC_NOTIFIER_HEAD(die_chain);
 
-int notify_die(enum die_val val, const char *str,
+int notrace notify_die(enum die_val val, const char *str,
 	       struct pt_regs *regs, long err, int trap, int sig)
 {
 	struct die_args args = {
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index 1d3ef29a2583..63598dca2d0c 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -80,12 +80,6 @@ static struct nsproxy *create_new_namespaces(unsigned long flags,
 		goto out_pid;
 	}
 
-	new_nsp->user_ns = copy_user_ns(flags, tsk->nsproxy->user_ns);
-	if (IS_ERR(new_nsp->user_ns)) {
-		err = PTR_ERR(new_nsp->user_ns);
-		goto out_user;
-	}
-
 	new_nsp->net_ns = copy_net_ns(flags, tsk->nsproxy->net_ns);
 	if (IS_ERR(new_nsp->net_ns)) {
 		err = PTR_ERR(new_nsp->net_ns);
@@ -95,9 +89,6 @@ static struct nsproxy *create_new_namespaces(unsigned long flags,
 	return new_nsp;
 
 out_net:
-	if (new_nsp->user_ns)
-		put_user_ns(new_nsp->user_ns);
-out_user:
 	if (new_nsp->pid_ns)
 		put_pid_ns(new_nsp->pid_ns);
 out_pid:
@@ -130,7 +121,7 @@ int copy_namespaces(unsigned long flags, struct task_struct *tsk)
 	get_nsproxy(old_ns);
 
 	if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
-				CLONE_NEWUSER | CLONE_NEWPID | CLONE_NEWNET)))
+				CLONE_NEWPID | CLONE_NEWNET)))
 		return 0;
 
 	if (!capable(CAP_SYS_ADMIN)) {
@@ -173,8 +164,6 @@ void free_nsproxy(struct nsproxy *ns)
 		put_ipc_ns(ns->ipc_ns);
 	if (ns->pid_ns)
 		put_pid_ns(ns->pid_ns);
-	if (ns->user_ns)
-		put_user_ns(ns->user_ns);
 	put_net(ns->net_ns);
 	kmem_cache_free(nsproxy_cachep, ns);
 }
@@ -189,7 +178,7 @@ int unshare_nsproxy_namespaces(unsigned long unshare_flags,
 	int err = 0;
 
 	if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
-			       CLONE_NEWUSER | CLONE_NEWNET)))
+			       CLONE_NEWNET)))
 		return 0;
 
 	if (!capable(CAP_SYS_ADMIN))
diff --git a/kernel/panic.c b/kernel/panic.c
index e0a87bb025c0..3a0b0898690a 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -21,9 +21,10 @@
 #include <linux/debug_locks.h>
 #include <linux/random.h>
 #include <linux/kallsyms.h>
+#include <linux/dmi.h>
 
 int panic_on_oops;
-int tainted;
+static unsigned long tainted_mask;
 static int pause_on_oops;
 static int pause_on_oops_flag;
 static DEFINE_SPINLOCK(pause_on_oops_lock);
@@ -34,13 +35,6 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
 
 EXPORT_SYMBOL(panic_notifier_list);
 
-static int __init panic_setup(char *str)
-{
-	panic_timeout = simple_strtoul(str, NULL, 0);
-	return 1;
-}
-__setup("panic=", panic_setup);
-
 static long no_blink(long time)
 {
 	return 0;
@@ -146,6 +140,27 @@ NORET_TYPE void panic(const char * fmt, ...)
 
 EXPORT_SYMBOL(panic);
 
+
+struct tnt {
+	u8 bit;
+	char true;
+	char false;
+};
+
+static const struct tnt tnts[] = {
+	{ TAINT_PROPRIETARY_MODULE, 'P', 'G' },
+	{ TAINT_FORCED_MODULE, 'F', ' ' },
+	{ TAINT_UNSAFE_SMP, 'S', ' ' },
+	{ TAINT_FORCED_RMMOD, 'R', ' ' },
+	{ TAINT_MACHINE_CHECK, 'M', ' ' },
+	{ TAINT_BAD_PAGE, 'B', ' ' },
+	{ TAINT_USER, 'U', ' ' },
+	{ TAINT_DIE, 'D', ' ' },
+	{ TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
+	{ TAINT_WARN, 'W', ' ' },
+	{ TAINT_CRAP, 'C', ' ' },
+};
+
 /**
  *	print_tainted - return a string to represent the kernel taint state.
  *
@@ -156,46 +171,50 @@ EXPORT_SYMBOL(panic);
  *  'M' - System experienced a machine check exception.
  *  'B' - System has hit bad_page.
  *  'U' - Userspace-defined naughtiness.
+ *  'D' - Kernel has oopsed before
  *  'A' - ACPI table overridden.
  *  'W' - Taint on warning.
+ *  'C' - modules from drivers/staging are loaded.
  *
  *	The string is overwritten by the next call to print_taint().
  */
-
 const char *print_tainted(void)
 {
-	static char buf[20];
-	if (tainted) {
-		snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c%c%c",
-			tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
-			tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
-			tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
-			tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
-			tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
-			tainted & TAINT_BAD_PAGE ? 'B' : ' ',
-			tainted & TAINT_USER ? 'U' : ' ',
-			tainted & TAINT_DIE ? 'D' : ' ',
-			tainted & TAINT_OVERRIDDEN_ACPI_TABLE ? 'A' : ' ',
-			tainted & TAINT_WARN ? 'W' : ' ');
-	}
-	else
+	static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ") + 1];
+
+	if (tainted_mask) {
+		char *s;
+		int i;
+
+		s = buf + sprintf(buf, "Tainted: ");
+		for (i = 0; i < ARRAY_SIZE(tnts); i++) {
+			const struct tnt *t = &tnts[i];
+			*s++ = test_bit(t->bit, &tainted_mask) ?
+					t->true : t->false;
+		}
+		*s = 0;
+	} else
 		snprintf(buf, sizeof(buf), "Not tainted");
 	return(buf);
 }
 
-void add_taint(unsigned flag)
+int test_taint(unsigned flag)
 {
-	debug_locks = 0; /* can't trust the integrity of the kernel anymore */
-	tainted |= flag;
+	return test_bit(flag, &tainted_mask);
+}
+EXPORT_SYMBOL(test_taint);
+
+unsigned long get_taint(void)
+{
+	return tainted_mask;
 }
-EXPORT_SYMBOL(add_taint);
 
-static int __init pause_on_oops_setup(char *str)
+void add_taint(unsigned flag)
 {
-	pause_on_oops = simple_strtoul(str, NULL, 0);
-	return 1;
+	debug_locks = 0; /* can't trust the integrity of the kernel anymore */
+	set_bit(flag, &tainted_mask);
 }
-__setup("pause_on_oops=", pause_on_oops_setup);
+EXPORT_SYMBOL(add_taint);
 
 static void spin_msec(int msecs)
 {
@@ -306,36 +325,27 @@ void oops_exit(void)
 }
 
 #ifdef WANT_WARN_ON_SLOWPATH
-void warn_on_slowpath(const char *file, int line)
-{
-	char function[KSYM_SYMBOL_LEN];
-	unsigned long caller = (unsigned long) __builtin_return_address(0);
-	sprint_symbol(function, caller);
-
-	printk(KERN_WARNING "------------[ cut here ]------------\n");
-	printk(KERN_WARNING "WARNING: at %s:%d %s()\n", file,
-		line, function);
-	print_modules();
-	dump_stack();
-	print_oops_end_marker();
-	add_taint(TAINT_WARN);
-}
-EXPORT_SYMBOL(warn_on_slowpath);
-
-
 void warn_slowpath(const char *file, int line, const char *fmt, ...)
 {
 	va_list args;
 	char function[KSYM_SYMBOL_LEN];
 	unsigned long caller = (unsigned long)__builtin_return_address(0);
+	const char *board;
+
 	sprint_symbol(function, caller);
 
 	printk(KERN_WARNING "------------[ cut here ]------------\n");
 	printk(KERN_WARNING "WARNING: at %s:%d %s()\n", file,
 		line, function);
-	va_start(args, fmt);
-	vprintk(fmt, args);
-	va_end(args);
+	board = dmi_get_system_info(DMI_PRODUCT_NAME);
+	if (board)
+		printk(KERN_WARNING "Hardware name: %s\n", board);
+
+	if (fmt) {
+		va_start(args, fmt);
+		vprintk(fmt, args);
+		va_end(args);
+	}
 
 	print_modules();
 	dump_stack();
@@ -363,3 +373,6 @@ void __stack_chk_fail(void)
 EXPORT_SYMBOL(__stack_chk_fail);
 
 #endif
+
+core_param(panic, panic_timeout, int, 0644);
+core_param(pause_on_oops, pause_on_oops, int, 0644);
diff --git a/kernel/params.c b/kernel/params.c
index afc46a23eb6d..a1e3025b19a9 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -373,6 +373,8 @@ int param_get_string(char *buffer, struct kernel_param *kp)
 }
 
 /* sysfs output in /sys/modules/XYZ/parameters/ */
+#define to_module_attr(n) container_of(n, struct module_attribute, attr);
+#define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
 
 extern struct kernel_param __start___param[], __stop___param[];
 
@@ -384,6 +386,7 @@ struct param_attribute
 
 struct module_param_attrs
 {
+	unsigned int num;
 	struct attribute_group grp;
 	struct param_attribute attrs[0];
 };
@@ -434,93 +437,120 @@ static ssize_t param_attr_store(struct module_attribute *mattr,
 
 #ifdef CONFIG_SYSFS
 /*
- * param_sysfs_setup - setup sysfs support for one module or KBUILD_MODNAME
- * @mk: struct module_kobject (contains parent kobject)
- * @kparam: array of struct kernel_param, the actual parameter definitions
- * @num_params: number of entries in array
- * @name_skip: offset where the parameter name start in kparam[].name. Needed for built-in "modules"
+ * add_sysfs_param - add a parameter to sysfs
+ * @mk: struct module_kobject
+ * @kparam: the actual parameter definition to add to sysfs
+ * @name: name of parameter
  *
- * Create a kobject for a (per-module) group of parameters, and create files
- * in sysfs. A pointer to the param_kobject is returned on success,
- * NULL if there's no parameter to export, or other ERR_PTR(err).
+ * Create a kobject if for a (per-module) parameter if mp NULL, and
+ * create file in sysfs.  Returns an error on out of memory.  Always cleans up
+ * if there's an error.
  */
-static __modinit struct module_param_attrs *
-param_sysfs_setup(struct module_kobject *mk,
-		  struct kernel_param *kparam,
-		  unsigned int num_params,
-		  unsigned int name_skip)
+static __modinit int add_sysfs_param(struct module_kobject *mk,
+				     struct kernel_param *kp,
+				     const char *name)
 {
-	struct module_param_attrs *mp;
-	unsigned int valid_attrs = 0;
-	unsigned int i, size[2];
-	struct param_attribute *pattr;
-	struct attribute **gattr;
-	int err;
-
-	for (i=0; i<num_params; i++) {
-		if (kparam[i].perm)
-			valid_attrs++;
+	struct module_param_attrs *new;
+	struct attribute **attrs;
+	int err, num;
+
+	/* We don't bother calling this with invisible parameters. */
+	BUG_ON(!kp->perm);
+
+	if (!mk->mp) {
+		num = 0;
+		attrs = NULL;
+	} else {
+		num = mk->mp->num;
+		attrs = mk->mp->grp.attrs;
 	}
 
-	if (!valid_attrs)
-		return NULL;
-
-	size[0] = ALIGN(sizeof(*mp) +
-			valid_attrs * sizeof(mp->attrs[0]),
-			sizeof(mp->grp.attrs[0]));
-	size[1] = (valid_attrs + 1) * sizeof(mp->grp.attrs[0]);
-
-	mp = kzalloc(size[0] + size[1], GFP_KERNEL);
-	if (!mp)
-		return ERR_PTR(-ENOMEM);
-
-	mp->grp.name = "parameters";
-	mp->grp.attrs = (void *)mp + size[0];
-
-	pattr = &mp->attrs[0];
-	gattr = &mp->grp.attrs[0];
-	for (i = 0; i < num_params; i++) {
-		struct kernel_param *kp = &kparam[i];
-		if (kp->perm) {
-			pattr->param = kp;
-			pattr->mattr.show = param_attr_show;
-			pattr->mattr.store = param_attr_store;
-			pattr->mattr.attr.name = (char *)&kp->name[name_skip];
-			pattr->mattr.attr.mode = kp->perm;
-			*(gattr++) = &(pattr++)->mattr.attr;
-		}
+	/* Enlarge. */
+	new = krealloc(mk->mp,
+		       sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1),
+		       GFP_KERNEL);
+	if (!new) {
+		kfree(mk->mp);
+		err = -ENOMEM;
+		goto fail;
 	}
-	*gattr = NULL;
-
-	if ((err = sysfs_create_group(&mk->kobj, &mp->grp))) {
-		kfree(mp);
-		return ERR_PTR(err);
+	attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL);
+	if (!attrs) {
+		err = -ENOMEM;
+		goto fail_free_new;
 	}
-	return mp;
+
+	/* Sysfs wants everything zeroed. */
+	memset(new, 0, sizeof(*new));
+	memset(&new->attrs[num], 0, sizeof(new->attrs[num]));
+	memset(&attrs[num], 0, sizeof(attrs[num]));
+	new->grp.name = "parameters";
+	new->grp.attrs = attrs;
+
+	/* Tack new one on the end. */
+	new->attrs[num].param = kp;
+	new->attrs[num].mattr.show = param_attr_show;
+	new->attrs[num].mattr.store = param_attr_store;
+	new->attrs[num].mattr.attr.name = (char *)name;
+	new->attrs[num].mattr.attr.mode = kp->perm;
+	new->num = num+1;
+
+	/* Fix up all the pointers, since krealloc can move us */
+	for (num = 0; num < new->num; num++)
+		new->grp.attrs[num] = &new->attrs[num].mattr.attr;
+	new->grp.attrs[num] = NULL;
+
+	mk->mp = new;
+	return 0;
+
+fail_free_new:
+	kfree(new);
+fail:
+	mk->mp = NULL;
+	return err;
 }
 
 #ifdef CONFIG_MODULES
+static void free_module_param_attrs(struct module_kobject *mk)
+{
+	kfree(mk->mp->grp.attrs);
+	kfree(mk->mp);
+	mk->mp = NULL;
+}
+
 /*
  * module_param_sysfs_setup - setup sysfs support for one module
  * @mod: module
  * @kparam: module parameters (array)
  * @num_params: number of module parameters
  *
- * Adds sysfs entries for module parameters, and creates a link from
- * /sys/module/[mod->name]/parameters to /sys/parameters/[mod->name]/
+ * Adds sysfs entries for module parameters under
+ * /sys/module/[mod->name]/parameters/
  */
 int module_param_sysfs_setup(struct module *mod,
 			     struct kernel_param *kparam,
 			     unsigned int num_params)
 {
-	struct module_param_attrs *mp;
+	int i, err;
+	bool params = false;
+
+	for (i = 0; i < num_params; i++) {
+		if (kparam[i].perm == 0)
+			continue;
+		err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name);
+		if (err)
+			return err;
+		params = true;
+	}
 
-	mp = param_sysfs_setup(&mod->mkobj, kparam, num_params, 0);
-	if (IS_ERR(mp))
-		return PTR_ERR(mp);
+	if (!params)
+		return 0;
 
-	mod->param_attrs = mp;
-	return 0;
+	/* Create the param group. */
+	err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
+	if (err)
+		free_module_param_attrs(&mod->mkobj);
+	return err;
 }
 
 /*
@@ -532,43 +562,55 @@ int module_param_sysfs_setup(struct module *mod,
  */
 void module_param_sysfs_remove(struct module *mod)
 {
-	if (mod->param_attrs) {
-		sysfs_remove_group(&mod->mkobj.kobj,
-				   &mod->param_attrs->grp);
+	if (mod->mkobj.mp) {
+		sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
 		/* We are positive that no one is using any param
 		 * attrs at this point.  Deallocate immediately. */
-		kfree(mod->param_attrs);
-		mod->param_attrs = NULL;
+		free_module_param_attrs(&mod->mkobj);
 	}
 }
 #endif
 
-/*
- * kernel_param_sysfs_setup - wrapper for built-in params support
- */
-static void __init kernel_param_sysfs_setup(const char *name,
-					    struct kernel_param *kparam,
-					    unsigned int num_params,
-					    unsigned int name_skip)
+static void __init kernel_add_sysfs_param(const char *name,
+					  struct kernel_param *kparam,
+					  unsigned int name_skip)
 {
 	struct module_kobject *mk;
-	int ret;
+	struct kobject *kobj;
+	int err;
 
-	mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
-	BUG_ON(!mk);
-
-	mk->mod = THIS_MODULE;
-	mk->kobj.kset = module_kset;
-	ret = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, "%s", name);
-	if (ret) {
-		kobject_put(&mk->kobj);
-		printk(KERN_ERR "Module '%s' failed to be added to sysfs, "
-		      "error number %d\n", name, ret);
-		printk(KERN_ERR	"The system will be unstable now.\n");
-		return;
+	kobj = kset_find_obj(module_kset, name);
+	if (kobj) {
+		/* We already have one.  Remove params so we can add more. */
+		mk = to_module_kobject(kobj);
+		/* We need to remove it before adding parameters. */
+		sysfs_remove_group(&mk->kobj, &mk->mp->grp);
+	} else {
+		mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
+		BUG_ON(!mk);
+
+		mk->mod = THIS_MODULE;
+		mk->kobj.kset = module_kset;
+		err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL,
+					   "%s", name);
+		if (err) {
+			kobject_put(&mk->kobj);
+			printk(KERN_ERR "Module '%s' failed add to sysfs, "
+			       "error number %d\n", name, err);
+			printk(KERN_ERR	"The system will be unstable now.\n");
+			return;
+		}
+		/* So that exit path is even. */
+		kobject_get(&mk->kobj);
 	}
-	param_sysfs_setup(mk, kparam, num_params, name_skip);
+
+	/* These should not fail at boot. */
+	err = add_sysfs_param(mk, kparam, kparam->name + name_skip);
+	BUG_ON(err);
+	err = sysfs_create_group(&mk->kobj, &mk->mp->grp);
+	BUG_ON(err);
 	kobject_uevent(&mk->kobj, KOBJ_ADD);
+	kobject_put(&mk->kobj);
 }
 
 /*
@@ -579,60 +621,36 @@ static void __init kernel_param_sysfs_setup(const char *name,
  * The "module" name (KBUILD_MODNAME) is stored before a dot, the
  * "parameter" name is stored behind a dot in kernel_param->name. So,
  * extract the "module" name for all built-in kernel_param-eters,
- * and for all who have the same, call kernel_param_sysfs_setup.
+ * and for all who have the same, call kernel_add_sysfs_param.
  */
 static void __init param_sysfs_builtin(void)
 {
-	struct kernel_param *kp, *kp_begin = NULL;
-	unsigned int i, name_len, count = 0;
-	char modname[MODULE_NAME_LEN + 1] = "";
+	struct kernel_param *kp;
+	unsigned int name_len;
+	char modname[MODULE_NAME_LEN];
 
-	for (i=0; i < __stop___param - __start___param; i++) {
+	for (kp = __start___param; kp < __stop___param; kp++) {
 		char *dot;
-		size_t max_name_len;
 
-		kp = &__start___param[i];
-		max_name_len =
-			min_t(size_t, MODULE_NAME_LEN, strlen(kp->name));
+		if (kp->perm == 0)
+			continue;
 
-		dot = memchr(kp->name, '.', max_name_len);
+		dot = strchr(kp->name, '.');
 		if (!dot) {
-			DEBUGP("couldn't find period in first %d characters "
-			       "of %s\n", MODULE_NAME_LEN, kp->name);
-			continue;
-		}
-		name_len = dot - kp->name;
-
- 		/* new kbuild_modname? */
-		if (strlen(modname) != name_len
-		    || strncmp(modname, kp->name, name_len) != 0) {
-			/* add a new kobject for previous kernel_params. */
-			if (count)
-				kernel_param_sysfs_setup(modname,
-							 kp_begin,
-							 count,
-							 strlen(modname)+1);
-
-			strncpy(modname, kp->name, name_len);
-			modname[name_len] = '\0';
-			count = 0;
-			kp_begin = kp;
+			/* This happens for core_param() */
+			strcpy(modname, "kernel");
+			name_len = 0;
+		} else {
+			name_len = dot - kp->name + 1;
+			strlcpy(modname, kp->name, name_len);
 		}
-		count++;
+		kernel_add_sysfs_param(modname, kp, name_len);
 	}
-
-	/* last kernel_params need to be registered as well */
-	if (count)
-		kernel_param_sysfs_setup(modname, kp_begin, count,
-					 strlen(modname)+1);
 }
 
 
 /* module-related sysfs stuff */
 
-#define to_module_attr(n) container_of(n, struct module_attribute, attr);
-#define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
-
 static ssize_t module_attr_show(struct kobject *kobj,
 				struct attribute *attr,
 				char *buf)
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index c42a03aef36f..157de3a47832 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -7,6 +7,93 @@
 #include <linux/errno.h>
 #include <linux/math64.h>
 #include <asm/uaccess.h>
+#include <linux/kernel_stat.h>
+
+/*
+ * Allocate the thread_group_cputime structure appropriately and fill in the
+ * current values of the fields.  Called from copy_signal() via
+ * thread_group_cputime_clone_thread() when adding a second or subsequent
+ * thread to a thread group.  Assumes interrupts are enabled when called.
+ */
+int thread_group_cputime_alloc(struct task_struct *tsk)
+{
+	struct signal_struct *sig = tsk->signal;
+	struct task_cputime *cputime;
+
+	/*
+	 * If we have multiple threads and we don't already have a
+	 * per-CPU task_cputime struct (checked in the caller), allocate
+	 * one and fill it in with the times accumulated so far.  We may
+	 * race with another thread so recheck after we pick up the sighand
+	 * lock.
+	 */
+	cputime = alloc_percpu(struct task_cputime);
+	if (cputime == NULL)
+		return -ENOMEM;
+	spin_lock_irq(&tsk->sighand->siglock);
+	if (sig->cputime.totals) {
+		spin_unlock_irq(&tsk->sighand->siglock);
+		free_percpu(cputime);
+		return 0;
+	}
+	sig->cputime.totals = cputime;
+	cputime = per_cpu_ptr(sig->cputime.totals, smp_processor_id());
+	cputime->utime = tsk->utime;
+	cputime->stime = tsk->stime;
+	cputime->sum_exec_runtime = tsk->se.sum_exec_runtime;
+	spin_unlock_irq(&tsk->sighand->siglock);
+	return 0;
+}
+
+/**
+ * thread_group_cputime - Sum the thread group time fields across all CPUs.
+ *
+ * @tsk:	The task we use to identify the thread group.
+ * @times:	task_cputime structure in which we return the summed fields.
+ *
+ * Walk the list of CPUs to sum the per-CPU time fields in the thread group
+ * time structure.
+ */
+void thread_group_cputime(
+	struct task_struct *tsk,
+	struct task_cputime *times)
+{
+	struct task_cputime *totals, *tot;
+	int i;
+
+	totals = tsk->signal->cputime.totals;
+	if (!totals) {
+		times->utime = tsk->utime;
+		times->stime = tsk->stime;
+		times->sum_exec_runtime = tsk->se.sum_exec_runtime;
+		return;
+	}
+
+	times->stime = times->utime = cputime_zero;
+	times->sum_exec_runtime = 0;
+	for_each_possible_cpu(i) {
+		tot = per_cpu_ptr(totals, i);
+		times->utime = cputime_add(times->utime, tot->utime);
+		times->stime = cputime_add(times->stime, tot->stime);
+		times->sum_exec_runtime += tot->sum_exec_runtime;
+	}
+}
+
+/*
+ * Called after updating RLIMIT_CPU to set timer expiration if necessary.
+ */
+void update_rlimit_cpu(unsigned long rlim_new)
+{
+	cputime_t cputime;
+
+	cputime = secs_to_cputime(rlim_new);
+	if (cputime_eq(current->signal->it_prof_expires, cputime_zero) ||
+	    cputime_lt(current->signal->it_prof_expires, cputime)) {
+		spin_lock_irq(&current->sighand->siglock);
+		set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL);
+		spin_unlock_irq(&current->sighand->siglock);
+	}
+}
 
 static int check_clock(const clockid_t which_clock)
 {
@@ -158,10 +245,6 @@ static inline cputime_t virt_ticks(struct task_struct *p)
 {
 	return p->utime;
 }
-static inline unsigned long long sched_ns(struct task_struct *p)
-{
-	return task_sched_runtime(p);
-}
 
 int posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp)
 {
@@ -211,7 +294,7 @@ static int cpu_clock_sample(const clockid_t which_clock, struct task_struct *p,
 		cpu->cpu = virt_ticks(p);
 		break;
 	case CPUCLOCK_SCHED:
-		cpu->sched = sched_ns(p);
+		cpu->sched = p->se.sum_exec_runtime + task_delta_exec(p);
 		break;
 	}
 	return 0;
@@ -220,59 +303,30 @@ static int cpu_clock_sample(const clockid_t which_clock, struct task_struct *p,
 /*
  * Sample a process (thread group) clock for the given group_leader task.
  * Must be called with tasklist_lock held for reading.
- * Must be called with tasklist_lock held for reading, and p->sighand->siglock.
  */
-static int cpu_clock_sample_group_locked(unsigned int clock_idx,
-					 struct task_struct *p,
-					 union cpu_time_count *cpu)
+static int cpu_clock_sample_group(const clockid_t which_clock,
+				  struct task_struct *p,
+				  union cpu_time_count *cpu)
 {
-	struct task_struct *t = p;
- 	switch (clock_idx) {
+	struct task_cputime cputime;
+
+	thread_group_cputime(p, &cputime);
+	switch (CPUCLOCK_WHICH(which_clock)) {
 	default:
 		return -EINVAL;
 	case CPUCLOCK_PROF:
-		cpu->cpu = cputime_add(p->signal->utime, p->signal->stime);
-		do {
-			cpu->cpu = cputime_add(cpu->cpu, prof_ticks(t));
-			t = next_thread(t);
-		} while (t != p);
+		cpu->cpu = cputime_add(cputime.utime, cputime.stime);
 		break;
 	case CPUCLOCK_VIRT:
-		cpu->cpu = p->signal->utime;
-		do {
-			cpu->cpu = cputime_add(cpu->cpu, virt_ticks(t));
-			t = next_thread(t);
-		} while (t != p);
+		cpu->cpu = cputime.utime;
 		break;
 	case CPUCLOCK_SCHED:
-		cpu->sched = p->signal->sum_sched_runtime;
-		/* Add in each other live thread.  */
-		while ((t = next_thread(t)) != p) {
-			cpu->sched += t->se.sum_exec_runtime;
-		}
-		cpu->sched += sched_ns(p);
+		cpu->sched = cputime.sum_exec_runtime + task_delta_exec(p);
 		break;
 	}
 	return 0;
 }
 
-/*
- * Sample a process (thread group) clock for the given group_leader task.
- * Must be called with tasklist_lock held for reading.
- */
-static int cpu_clock_sample_group(const clockid_t which_clock,
-				  struct task_struct *p,
-				  union cpu_time_count *cpu)
-{
-	int ret;
-	unsigned long flags;
-	spin_lock_irqsave(&p->sighand->siglock, flags);
-	ret = cpu_clock_sample_group_locked(CPUCLOCK_WHICH(which_clock), p,
-					    cpu);
-	spin_unlock_irqrestore(&p->sighand->siglock, flags);
-	return ret;
-}
-
 
 int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
 {
@@ -471,80 +525,11 @@ void posix_cpu_timers_exit(struct task_struct *tsk)
 }
 void posix_cpu_timers_exit_group(struct task_struct *tsk)
 {
-	cleanup_timers(tsk->signal->cpu_timers,
-		       cputime_add(tsk->utime, tsk->signal->utime),
-		       cputime_add(tsk->stime, tsk->signal->stime),
-		     tsk->se.sum_exec_runtime + tsk->signal->sum_sched_runtime);
-}
-
-
-/*
- * Set the expiry times of all the threads in the process so one of them
- * will go off before the process cumulative expiry total is reached.
- */
-static void process_timer_rebalance(struct task_struct *p,
-				    unsigned int clock_idx,
-				    union cpu_time_count expires,
-				    union cpu_time_count val)
-{
-	cputime_t ticks, left;
-	unsigned long long ns, nsleft;
- 	struct task_struct *t = p;
-	unsigned int nthreads = atomic_read(&p->signal->live);
+	struct task_cputime cputime;
 
-	if (!nthreads)
-		return;
-
-	switch (clock_idx) {
-	default:
-		BUG();
-		break;
-	case CPUCLOCK_PROF:
-		left = cputime_div_non_zero(cputime_sub(expires.cpu, val.cpu),
-				       nthreads);
-		do {
-			if (likely(!(t->flags & PF_EXITING))) {
-				ticks = cputime_add(prof_ticks(t), left);
-				if (cputime_eq(t->it_prof_expires,
-					       cputime_zero) ||
-				    cputime_gt(t->it_prof_expires, ticks)) {
-					t->it_prof_expires = ticks;
-				}
-			}
-			t = next_thread(t);
-		} while (t != p);
-		break;
-	case CPUCLOCK_VIRT:
-		left = cputime_div_non_zero(cputime_sub(expires.cpu, val.cpu),
-				       nthreads);
-		do {
-			if (likely(!(t->flags & PF_EXITING))) {
-				ticks = cputime_add(virt_ticks(t), left);
-				if (cputime_eq(t->it_virt_expires,
-					       cputime_zero) ||
-				    cputime_gt(t->it_virt_expires, ticks)) {
-					t->it_virt_expires = ticks;
-				}
-			}
-			t = next_thread(t);
-		} while (t != p);
-		break;
-	case CPUCLOCK_SCHED:
-		nsleft = expires.sched - val.sched;
-		do_div(nsleft, nthreads);
-		nsleft = max_t(unsigned long long, nsleft, 1);
-		do {
-			if (likely(!(t->flags & PF_EXITING))) {
-				ns = t->se.sum_exec_runtime + nsleft;
-				if (t->it_sched_expires == 0 ||
-				    t->it_sched_expires > ns) {
-					t->it_sched_expires = ns;
-				}
-			}
-			t = next_thread(t);
-		} while (t != p);
-		break;
-	}
+	thread_group_cputime(tsk, &cputime);
+	cleanup_timers(tsk->signal->cpu_timers,
+		       cputime.utime, cputime.stime, cputime.sum_exec_runtime);
 }
 
 static void clear_dead_task(struct k_itimer *timer, union cpu_time_count now)
@@ -608,29 +593,32 @@ static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
 			default:
 				BUG();
 			case CPUCLOCK_PROF:
-				if (cputime_eq(p->it_prof_expires,
+				if (cputime_eq(p->cputime_expires.prof_exp,
 					       cputime_zero) ||
-				    cputime_gt(p->it_prof_expires,
+				    cputime_gt(p->cputime_expires.prof_exp,
 					       nt->expires.cpu))
-					p->it_prof_expires = nt->expires.cpu;
+					p->cputime_expires.prof_exp =
+						nt->expires.cpu;
 				break;
 			case CPUCLOCK_VIRT:
-				if (cputime_eq(p->it_virt_expires,
+				if (cputime_eq(p->cputime_expires.virt_exp,
 					       cputime_zero) ||
-				    cputime_gt(p->it_virt_expires,
+				    cputime_gt(p->cputime_expires.virt_exp,
 					       nt->expires.cpu))
-					p->it_virt_expires = nt->expires.cpu;
+					p->cputime_expires.virt_exp =
+						nt->expires.cpu;
 				break;
 			case CPUCLOCK_SCHED:
-				if (p->it_sched_expires == 0 ||
-				    p->it_sched_expires > nt->expires.sched)
-					p->it_sched_expires = nt->expires.sched;
+				if (p->cputime_expires.sched_exp == 0 ||
+				    p->cputime_expires.sched_exp >
+							nt->expires.sched)
+					p->cputime_expires.sched_exp =
+						nt->expires.sched;
 				break;
 			}
 		} else {
 			/*
-			 * For a process timer, we must balance
-			 * all the live threads' expirations.
+			 * For a process timer, set the cached expiration time.
 			 */
 			switch (CPUCLOCK_WHICH(timer->it_clock)) {
 			default:
@@ -641,7 +629,9 @@ static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
 				    cputime_lt(p->signal->it_virt_expires,
 					       timer->it.cpu.expires.cpu))
 					break;
-				goto rebalance;
+				p->signal->cputime_expires.virt_exp =
+					timer->it.cpu.expires.cpu;
+				break;
 			case CPUCLOCK_PROF:
 				if (!cputime_eq(p->signal->it_prof_expires,
 						cputime_zero) &&
@@ -652,13 +642,12 @@ static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
 				if (i != RLIM_INFINITY &&
 				    i <= cputime_to_secs(timer->it.cpu.expires.cpu))
 					break;
-				goto rebalance;
+				p->signal->cputime_expires.prof_exp =
+					timer->it.cpu.expires.cpu;
+				break;
 			case CPUCLOCK_SCHED:
-			rebalance:
-				process_timer_rebalance(
-					timer->it.cpu.task,
-					CPUCLOCK_WHICH(timer->it_clock),
-					timer->it.cpu.expires, now);
+				p->signal->cputime_expires.sched_exp =
+					timer->it.cpu.expires.sched;
 				break;
 			}
 		}
@@ -969,13 +958,13 @@ static void check_thread_timers(struct task_struct *tsk,
 	struct signal_struct *const sig = tsk->signal;
 
 	maxfire = 20;
-	tsk->it_prof_expires = cputime_zero;
+	tsk->cputime_expires.prof_exp = cputime_zero;
 	while (!list_empty(timers)) {
 		struct cpu_timer_list *t = list_first_entry(timers,
 						      struct cpu_timer_list,
 						      entry);
 		if (!--maxfire || cputime_lt(prof_ticks(tsk), t->expires.cpu)) {
-			tsk->it_prof_expires = t->expires.cpu;
+			tsk->cputime_expires.prof_exp = t->expires.cpu;
 			break;
 		}
 		t->firing = 1;
@@ -984,13 +973,13 @@ static void check_thread_timers(struct task_struct *tsk,
 
 	++timers;
 	maxfire = 20;
-	tsk->it_virt_expires = cputime_zero;
+	tsk->cputime_expires.virt_exp = cputime_zero;
 	while (!list_empty(timers)) {
 		struct cpu_timer_list *t = list_first_entry(timers,
 						      struct cpu_timer_list,
 						      entry);
 		if (!--maxfire || cputime_lt(virt_ticks(tsk), t->expires.cpu)) {
-			tsk->it_virt_expires = t->expires.cpu;
+			tsk->cputime_expires.virt_exp = t->expires.cpu;
 			break;
 		}
 		t->firing = 1;
@@ -999,13 +988,13 @@ static void check_thread_timers(struct task_struct *tsk,
 
 	++timers;
 	maxfire = 20;
-	tsk->it_sched_expires = 0;
+	tsk->cputime_expires.sched_exp = 0;
 	while (!list_empty(timers)) {
 		struct cpu_timer_list *t = list_first_entry(timers,
 						      struct cpu_timer_list,
 						      entry);
 		if (!--maxfire || tsk->se.sum_exec_runtime < t->expires.sched) {
-			tsk->it_sched_expires = t->expires.sched;
+			tsk->cputime_expires.sched_exp = t->expires.sched;
 			break;
 		}
 		t->firing = 1;
@@ -1055,10 +1044,10 @@ static void check_process_timers(struct task_struct *tsk,
 {
 	int maxfire;
 	struct signal_struct *const sig = tsk->signal;
-	cputime_t utime, stime, ptime, virt_expires, prof_expires;
+	cputime_t utime, ptime, virt_expires, prof_expires;
 	unsigned long long sum_sched_runtime, sched_expires;
-	struct task_struct *t;
 	struct list_head *timers = sig->cpu_timers;
+	struct task_cputime cputime;
 
 	/*
 	 * Don't sample the current process CPU clocks if there are no timers.
@@ -1074,18 +1063,10 @@ static void check_process_timers(struct task_struct *tsk,
 	/*
 	 * Collect the current process totals.
 	 */
-	utime = sig->utime;
-	stime = sig->stime;
-	sum_sched_runtime = sig->sum_sched_runtime;
-	t = tsk;
-	do {
-		utime = cputime_add(utime, t->utime);
-		stime = cputime_add(stime, t->stime);
-		sum_sched_runtime += t->se.sum_exec_runtime;
-		t = next_thread(t);
-	} while (t != tsk);
-	ptime = cputime_add(utime, stime);
-
+	thread_group_cputime(tsk, &cputime);
+	utime = cputime.utime;
+	ptime = cputime_add(utime, cputime.stime);
+	sum_sched_runtime = cputime.sum_exec_runtime;
 	maxfire = 20;
 	prof_expires = cputime_zero;
 	while (!list_empty(timers)) {
@@ -1193,60 +1174,18 @@ static void check_process_timers(struct task_struct *tsk,
 		}
 	}
 
-	if (!cputime_eq(prof_expires, cputime_zero) ||
-	    !cputime_eq(virt_expires, cputime_zero) ||
-	    sched_expires != 0) {
-		/*
-		 * Rebalance the threads' expiry times for the remaining
-		 * process CPU timers.
-		 */
-
-		cputime_t prof_left, virt_left, ticks;
-		unsigned long long sched_left, sched;
-		const unsigned int nthreads = atomic_read(&sig->live);
-
-		if (!nthreads)
-			return;
-
-		prof_left = cputime_sub(prof_expires, utime);
-		prof_left = cputime_sub(prof_left, stime);
-		prof_left = cputime_div_non_zero(prof_left, nthreads);
-		virt_left = cputime_sub(virt_expires, utime);
-		virt_left = cputime_div_non_zero(virt_left, nthreads);
-		if (sched_expires) {
-			sched_left = sched_expires - sum_sched_runtime;
-			do_div(sched_left, nthreads);
-			sched_left = max_t(unsigned long long, sched_left, 1);
-		} else {
-			sched_left = 0;
-		}
-		t = tsk;
-		do {
-			if (unlikely(t->flags & PF_EXITING))
-				continue;
-
-			ticks = cputime_add(cputime_add(t->utime, t->stime),
-					    prof_left);
-			if (!cputime_eq(prof_expires, cputime_zero) &&
-			    (cputime_eq(t->it_prof_expires, cputime_zero) ||
-			     cputime_gt(t->it_prof_expires, ticks))) {
-				t->it_prof_expires = ticks;
-			}
-
-			ticks = cputime_add(t->utime, virt_left);
-			if (!cputime_eq(virt_expires, cputime_zero) &&
-			    (cputime_eq(t->it_virt_expires, cputime_zero) ||
-			     cputime_gt(t->it_virt_expires, ticks))) {
-				t->it_virt_expires = ticks;
-			}
-
-			sched = t->se.sum_exec_runtime + sched_left;
-			if (sched_expires && (t->it_sched_expires == 0 ||
-					      t->it_sched_expires > sched)) {
-				t->it_sched_expires = sched;
-			}
-		} while ((t = next_thread(t)) != tsk);
-	}
+	if (!cputime_eq(prof_expires, cputime_zero) &&
+	    (cputime_eq(sig->cputime_expires.prof_exp, cputime_zero) ||
+	     cputime_gt(sig->cputime_expires.prof_exp, prof_expires)))
+		sig->cputime_expires.prof_exp = prof_expires;
+	if (!cputime_eq(virt_expires, cputime_zero) &&
+	    (cputime_eq(sig->cputime_expires.virt_exp, cputime_zero) ||
+	     cputime_gt(sig->cputime_expires.virt_exp, virt_expires)))
+		sig->cputime_expires.virt_exp = virt_expires;
+	if (sched_expires != 0 &&
+	    (sig->cputime_expires.sched_exp == 0 ||
+	     sig->cputime_expires.sched_exp > sched_expires))
+		sig->cputime_expires.sched_exp = sched_expires;
 }
 
 /*
@@ -1314,6 +1253,89 @@ out:
 	++timer->it_requeue_pending;
 }
 
+/**
+ * task_cputime_zero - Check a task_cputime struct for all zero fields.
+ *
+ * @cputime:	The struct to compare.
+ *
+ * Checks @cputime to see if all fields are zero.  Returns true if all fields
+ * are zero, false if any field is nonzero.
+ */
+static inline int task_cputime_zero(const struct task_cputime *cputime)
+{
+	if (cputime_eq(cputime->utime, cputime_zero) &&
+	    cputime_eq(cputime->stime, cputime_zero) &&
+	    cputime->sum_exec_runtime == 0)
+		return 1;
+	return 0;
+}
+
+/**
+ * task_cputime_expired - Compare two task_cputime entities.
+ *
+ * @sample:	The task_cputime structure to be checked for expiration.
+ * @expires:	Expiration times, against which @sample will be checked.
+ *
+ * Checks @sample against @expires to see if any field of @sample has expired.
+ * Returns true if any field of the former is greater than the corresponding
+ * field of the latter if the latter field is set.  Otherwise returns false.
+ */
+static inline int task_cputime_expired(const struct task_cputime *sample,
+					const struct task_cputime *expires)
+{
+	if (!cputime_eq(expires->utime, cputime_zero) &&
+	    cputime_ge(sample->utime, expires->utime))
+		return 1;
+	if (!cputime_eq(expires->stime, cputime_zero) &&
+	    cputime_ge(cputime_add(sample->utime, sample->stime),
+		       expires->stime))
+		return 1;
+	if (expires->sum_exec_runtime != 0 &&
+	    sample->sum_exec_runtime >= expires->sum_exec_runtime)
+		return 1;
+	return 0;
+}
+
+/**
+ * fastpath_timer_check - POSIX CPU timers fast path.
+ *
+ * @tsk:	The task (thread) being checked.
+ *
+ * Check the task and thread group timers.  If both are zero (there are no
+ * timers set) return false.  Otherwise snapshot the task and thread group
+ * timers and compare them with the corresponding expiration times.  Return
+ * true if a timer has expired, else return false.
+ */
+static inline int fastpath_timer_check(struct task_struct *tsk)
+{
+	struct signal_struct *sig;
+
+	/* tsk == current, ensure it is safe to use ->signal/sighand */
+	if (unlikely(tsk->exit_state))
+		return 0;
+
+	if (!task_cputime_zero(&tsk->cputime_expires)) {
+		struct task_cputime task_sample = {
+			.utime = tsk->utime,
+			.stime = tsk->stime,
+			.sum_exec_runtime = tsk->se.sum_exec_runtime
+		};
+
+		if (task_cputime_expired(&task_sample, &tsk->cputime_expires))
+			return 1;
+	}
+
+	sig = tsk->signal;
+	if (!task_cputime_zero(&sig->cputime_expires)) {
+		struct task_cputime group_sample;
+
+		thread_group_cputime(tsk, &group_sample);
+		if (task_cputime_expired(&group_sample, &sig->cputime_expires))
+			return 1;
+	}
+	return 0;
+}
+
 /*
  * This is called from the timer interrupt handler.  The irq handler has
  * already updated our counts.  We need to check if any timers fire now.
@@ -1326,42 +1348,31 @@ void run_posix_cpu_timers(struct task_struct *tsk)
 
 	BUG_ON(!irqs_disabled());
 
-#define UNEXPIRED(clock) \
-		(cputime_eq(tsk->it_##clock##_expires, cputime_zero) || \
-		 cputime_lt(clock##_ticks(tsk), tsk->it_##clock##_expires))
-
-	if (UNEXPIRED(prof) && UNEXPIRED(virt) &&
-	    (tsk->it_sched_expires == 0 ||
-	     tsk->se.sum_exec_runtime < tsk->it_sched_expires))
+	/*
+	 * The fast path checks that there are no expired thread or thread
+	 * group timers.  If that's so, just return.
+	 */
+	if (!fastpath_timer_check(tsk))
 		return;
 
-#undef	UNEXPIRED
-
+	spin_lock(&tsk->sighand->siglock);
 	/*
-	 * Double-check with locks held.
+	 * Here we take off tsk->signal->cpu_timers[N] and
+	 * tsk->cpu_timers[N] all the timers that are firing, and
+	 * put them on the firing list.
 	 */
-	read_lock(&tasklist_lock);
-	if (likely(tsk->signal != NULL)) {
-		spin_lock(&tsk->sighand->siglock);
+	check_thread_timers(tsk, &firing);
+	check_process_timers(tsk, &firing);
 
-		/*
-		 * Here we take off tsk->cpu_timers[N] and tsk->signal->cpu_timers[N]
-		 * all the timers that are firing, and put them on the firing list.
-		 */
-		check_thread_timers(tsk, &firing);
-		check_process_timers(tsk, &firing);
-
-		/*
-		 * We must release these locks before taking any timer's lock.
-		 * There is a potential race with timer deletion here, as the
-		 * siglock now protects our private firing list.  We have set
-		 * the firing flag in each timer, so that a deletion attempt
-		 * that gets the timer lock before we do will give it up and
-		 * spin until we've taken care of that timer below.
-		 */
-		spin_unlock(&tsk->sighand->siglock);
-	}
-	read_unlock(&tasklist_lock);
+	/*
+	 * We must release these locks before taking any timer's lock.
+	 * There is a potential race with timer deletion here, as the
+	 * siglock now protects our private firing list.  We have set
+	 * the firing flag in each timer, so that a deletion attempt
+	 * that gets the timer lock before we do will give it up and
+	 * spin until we've taken care of that timer below.
+	 */
+	spin_unlock(&tsk->sighand->siglock);
 
 	/*
 	 * Now that all the timers on our list have the firing flag,
@@ -1389,10 +1400,9 @@ void run_posix_cpu_timers(struct task_struct *tsk)
 
 /*
  * Set one of the process-wide special case CPU timers.
- * The tasklist_lock and tsk->sighand->siglock must be held by the caller.
- * The oldval argument is null for the RLIMIT_CPU timer, where *newval is
- * absolute; non-null for ITIMER_*, where *newval is relative and we update
- * it to be absolute, *oldval is absolute and we update it to be relative.
+ * The tsk->sighand->siglock must be held by the caller.
+ * The *newval argument is relative and we update it to be absolute, *oldval
+ * is absolute and we update it to be relative.
  */
 void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
 			   cputime_t *newval, cputime_t *oldval)
@@ -1401,7 +1411,7 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
 	struct list_head *head;
 
 	BUG_ON(clock_idx == CPUCLOCK_SCHED);
-	cpu_clock_sample_group_locked(clock_idx, tsk, &now);
+	cpu_clock_sample_group(clock_idx, tsk, &now);
 
 	if (oldval) {
 		if (!cputime_eq(*oldval, cputime_zero)) {
@@ -1435,13 +1445,14 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
 	    cputime_ge(list_first_entry(head,
 				  struct cpu_timer_list, entry)->expires.cpu,
 		       *newval)) {
-		/*
-		 * Rejigger each thread's expiry time so that one will
-		 * notice before we hit the process-cumulative expiry time.
-		 */
-		union cpu_time_count expires = { .sched = 0 };
-		expires.cpu = *newval;
-		process_timer_rebalance(tsk, clock_idx, expires, now);
+		switch (clock_idx) {
+		case CPUCLOCK_PROF:
+			tsk->signal->cputime_expires.prof_exp = *newval;
+			break;
+		case CPUCLOCK_VIRT:
+			tsk->signal->cputime_expires.virt_exp = *newval;
+			break;
+		}
 	}
 }
 
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 5131e5471169..887c63787de6 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -116,7 +116,7 @@ static DEFINE_SPINLOCK(idr_lock);
  *	    must supply functions here, even if the function just returns
  *	    ENOSYS.  The standard POSIX timer management code assumes the
  *	    following: 1.) The k_itimer struct (sched.h) is used for the
- *	    timer.  2.) The list, it_lock, it_clock, it_id and it_process
+ *	    timer.  2.) The list, it_lock, it_clock, it_id and it_pid
  *	    fields are not modified by timer code.
  *
  *          At this time all functions EXCEPT clock_nanosleep can be
@@ -197,6 +197,11 @@ static int common_timer_create(struct k_itimer *new_timer)
 	return 0;
 }
 
+static int no_timer_create(struct k_itimer *new_timer)
+{
+	return -EOPNOTSUPP;
+}
+
 /*
  * Return nonzero if we know a priori this clockid_t value is bogus.
  */
@@ -223,6 +228,15 @@ static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp)
 }
 
 /*
+ * Get monotonic time for posix timers
+ */
+static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp)
+{
+	getrawmonotonic(tp);
+	return 0;
+}
+
+/*
  * Initialize everything, well, just everything in Posix clocks/timers ;)
  */
 static __init int init_posix_timers(void)
@@ -235,9 +249,16 @@ static __init int init_posix_timers(void)
 		.clock_get = posix_ktime_get_ts,
 		.clock_set = do_posix_clock_nosettime,
 	};
+	struct k_clock clock_monotonic_raw = {
+		.clock_getres = hrtimer_get_res,
+		.clock_get = posix_get_monotonic_raw,
+		.clock_set = do_posix_clock_nosettime,
+		.timer_create = no_timer_create,
+	};
 
 	register_posix_clock(CLOCK_REALTIME, &clock_realtime);
 	register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic);
+	register_posix_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw);
 
 	posix_timers_cache = kmem_cache_create("posix_timers_cache",
 					sizeof (struct k_itimer), 0, SLAB_PANIC,
@@ -298,6 +319,8 @@ void do_schedule_next_timer(struct siginfo *info)
 
 int posix_timer_event(struct k_itimer *timr, int si_private)
 {
+	struct task_struct *task;
+	int shared, ret = -1;
 	/*
 	 * FIXME: if ->sigq is queued we can race with
 	 * dequeue_signal()->do_schedule_next_timer().
@@ -311,25 +334,15 @@ int posix_timer_event(struct k_itimer *timr, int si_private)
 	 */
 	timr->sigq->info.si_sys_private = si_private;
 
-	timr->sigq->info.si_signo = timr->it_sigev_signo;
-	timr->sigq->info.si_code = SI_TIMER;
-	timr->sigq->info.si_tid = timr->it_id;
-	timr->sigq->info.si_value = timr->it_sigev_value;
-
-	if (timr->it_sigev_notify & SIGEV_THREAD_ID) {
-		struct task_struct *leader;
-		int ret = send_sigqueue(timr->sigq, timr->it_process, 0);
-
-		if (likely(ret >= 0))
-			return ret;
-
-		timr->it_sigev_notify = SIGEV_SIGNAL;
-		leader = timr->it_process->group_leader;
-		put_task_struct(timr->it_process);
-		timr->it_process = leader;
+	rcu_read_lock();
+	task = pid_task(timr->it_pid, PIDTYPE_PID);
+	if (task) {
+		shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID);
+		ret = send_sigqueue(timr->sigq, task, shared);
 	}
-
-	return send_sigqueue(timr->sigq, timr->it_process, 1);
+	rcu_read_unlock();
+	/* If we failed to send the signal the timer stops. */
+	return ret > 0;
 }
 EXPORT_SYMBOL_GPL(posix_timer_event);
 
@@ -404,7 +417,7 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
 	return ret;
 }
 
-static struct task_struct * good_sigevent(sigevent_t * event)
+static struct pid *good_sigevent(sigevent_t * event)
 {
 	struct task_struct *rtn = current->group_leader;
 
@@ -418,7 +431,7 @@ static struct task_struct * good_sigevent(sigevent_t * event)
 	    ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX)))
 		return NULL;
 
-	return rtn;
+	return task_pid(rtn);
 }
 
 void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock)
@@ -457,6 +470,7 @@ static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
 		idr_remove(&posix_timers_id, tmr->it_id);
 		spin_unlock_irqrestore(&idr_lock, flags);
 	}
+	put_pid(tmr->it_pid);
 	sigqueue_free(tmr->sigq);
 	kmem_cache_free(posix_timers_cache, tmr);
 }
@@ -468,11 +482,8 @@ sys_timer_create(const clockid_t which_clock,
 		 struct sigevent __user *timer_event_spec,
 		 timer_t __user * created_timer_id)
 {
-	int error = 0;
-	struct k_itimer *new_timer = NULL;
-	int new_timer_id;
-	struct task_struct *process = NULL;
-	unsigned long flags;
+	struct k_itimer *new_timer;
+	int error, new_timer_id;
 	sigevent_t event;
 	int it_id_set = IT_ID_NOT_SET;
 
@@ -490,12 +501,11 @@ sys_timer_create(const clockid_t which_clock,
 		goto out;
 	}
 	spin_lock_irq(&idr_lock);
-	error = idr_get_new(&posix_timers_id, (void *) new_timer,
-			    &new_timer_id);
+	error = idr_get_new(&posix_timers_id, new_timer, &new_timer_id);
 	spin_unlock_irq(&idr_lock);
-	if (error == -EAGAIN)
-		goto retry;
-	else if (error) {
+	if (error) {
+		if (error == -EAGAIN)
+			goto retry;
 		/*
 		 * Weird looking, but we return EAGAIN if the IDR is
 		 * full (proper POSIX return value for this)
@@ -526,67 +536,40 @@ sys_timer_create(const clockid_t which_clock,
 			error = -EFAULT;
 			goto out;
 		}
-		new_timer->it_sigev_notify = event.sigev_notify;
-		new_timer->it_sigev_signo = event.sigev_signo;
-		new_timer->it_sigev_value = event.sigev_value;
-
-		read_lock(&tasklist_lock);
-		if ((process = good_sigevent(&event))) {
-			/*
-			 * We may be setting up this process for another
-			 * thread.  It may be exiting.  To catch this
-			 * case the we check the PF_EXITING flag.  If
-			 * the flag is not set, the siglock will catch
-			 * him before it is too late (in exit_itimers).
-			 *
-			 * The exec case is a bit more invloved but easy
-			 * to code.  If the process is in our thread
-			 * group (and it must be or we would not allow
-			 * it here) and is doing an exec, it will cause
-			 * us to be killed.  In this case it will wait
-			 * for us to die which means we can finish this
-			 * linkage with our last gasp. I.e. no code :)
-			 */
-			spin_lock_irqsave(&process->sighand->siglock, flags);
-			if (!(process->flags & PF_EXITING)) {
-				new_timer->it_process = process;
-				list_add(&new_timer->list,
-					 &process->signal->posix_timers);
-				if (new_timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
-					get_task_struct(process);
-				spin_unlock_irqrestore(&process->sighand->siglock, flags);
-			} else {
-				spin_unlock_irqrestore(&process->sighand->siglock, flags);
-				process = NULL;
-			}
-		}
-		read_unlock(&tasklist_lock);
-		if (!process) {
+		rcu_read_lock();
+		new_timer->it_pid = get_pid(good_sigevent(&event));
+		rcu_read_unlock();
+		if (!new_timer->it_pid) {
 			error = -EINVAL;
 			goto out;
 		}
 	} else {
-		new_timer->it_sigev_notify = SIGEV_SIGNAL;
-		new_timer->it_sigev_signo = SIGALRM;
-		new_timer->it_sigev_value.sival_int = new_timer->it_id;
-		process = current->group_leader;
-		spin_lock_irqsave(&process->sighand->siglock, flags);
-		new_timer->it_process = process;
-		list_add(&new_timer->list, &process->signal->posix_timers);
-		spin_unlock_irqrestore(&process->sighand->siglock, flags);
+		event.sigev_notify = SIGEV_SIGNAL;
+		event.sigev_signo = SIGALRM;
+		event.sigev_value.sival_int = new_timer->it_id;
+		new_timer->it_pid = get_pid(task_tgid(current));
 	}
 
+	new_timer->it_sigev_notify     = event.sigev_notify;
+	new_timer->sigq->info.si_signo = event.sigev_signo;
+	new_timer->sigq->info.si_value = event.sigev_value;
+	new_timer->sigq->info.si_tid   = new_timer->it_id;
+	new_timer->sigq->info.si_code  = SI_TIMER;
+
+	spin_lock_irq(&current->sighand->siglock);
+	new_timer->it_signal = current->signal;
+	list_add(&new_timer->list, &current->signal->posix_timers);
+	spin_unlock_irq(&current->sighand->siglock);
+
+	return 0;
  	/*
 	 * In the case of the timer belonging to another task, after
 	 * the task is unlocked, the timer is owned by the other task
 	 * and may cease to exist at any time.  Don't use or modify
 	 * new_timer after the unlock call.
 	 */
-
 out:
-	if (error)
-		release_posix_timer(new_timer, it_id_set);
-
+	release_posix_timer(new_timer, it_id_set);
 	return error;
 }
 
@@ -597,7 +580,7 @@ out:
  * the find to the timer lock.  To avoid a dead lock, the timer id MUST
  * be release with out holding the timer lock.
  */
-static struct k_itimer * lock_timer(timer_t timer_id, unsigned long *flags)
+static struct k_itimer *lock_timer(timer_t timer_id, unsigned long *flags)
 {
 	struct k_itimer *timr;
 	/*
@@ -605,23 +588,19 @@ static struct k_itimer * lock_timer(timer_t timer_id, unsigned long *flags)
 	 * flags part over to the timer lock.  Must not let interrupts in
 	 * while we are moving the lock.
 	 */
-
 	spin_lock_irqsave(&idr_lock, *flags);
-	timr = (struct k_itimer *) idr_find(&posix_timers_id, (int) timer_id);
+	timr = idr_find(&posix_timers_id, (int)timer_id);
 	if (timr) {
 		spin_lock(&timr->it_lock);
-
-		if ((timr->it_id != timer_id) || !(timr->it_process) ||
-				!same_thread_group(timr->it_process, current)) {
-			spin_unlock(&timr->it_lock);
-			spin_unlock_irqrestore(&idr_lock, *flags);
-			timr = NULL;
-		} else
+		if (timr->it_signal == current->signal) {
 			spin_unlock(&idr_lock);
-	} else
-		spin_unlock_irqrestore(&idr_lock, *flags);
+			return timr;
+		}
+		spin_unlock(&timr->it_lock);
+	}
+	spin_unlock_irqrestore(&idr_lock, *flags);
 
-	return timr;
+	return NULL;
 }
 
 /*
@@ -668,7 +647,7 @@ common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting)
 	    (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE))
 		timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, iv);
 
-	remaining = ktime_sub(timer->expires, now);
+	remaining = ktime_sub(hrtimer_get_expires(timer), now);
 	/* Return 0 only, when the timer is expired and not pending */
 	if (remaining.tv64 <= 0) {
 		/*
@@ -762,7 +741,7 @@ common_timer_set(struct k_itimer *timr, int flags,
 	hrtimer_init(&timr->it.real.timer, timr->it_clock, mode);
 	timr->it.real.timer.function = posix_timer_fn;
 
-	timer->expires = timespec_to_ktime(new_setting->it_value);
+	hrtimer_set_expires(timer, timespec_to_ktime(new_setting->it_value));
 
 	/* Convert interval */
 	timr->it.real.interval = timespec_to_ktime(new_setting->it_interval);
@@ -771,14 +750,12 @@ common_timer_set(struct k_itimer *timr, int flags,
 	if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) {
 		/* Setup correct expiry time for relative timers */
 		if (mode == HRTIMER_MODE_REL) {
-			timer->expires =
-				ktime_add_safe(timer->expires,
-					       timer->base->get_time());
+			hrtimer_add_expires(timer, timer->base->get_time());
 		}
 		return 0;
 	}
 
-	hrtimer_start(timer, timer->expires, mode);
+	hrtimer_start_expires(timer, mode);
 	return 0;
 }
 
@@ -862,9 +839,7 @@ retry_delete:
 	 * This keeps any tasks waiting on the spin lock from thinking
 	 * they got something (see the lock code above).
 	 */
-	if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
-		put_task_struct(timer->it_process);
-	timer->it_process = NULL;
+	timer->it_signal = NULL;
 
 	unlock_timer(timer, flags);
 	release_posix_timer(timer, IT_ID_SET);
@@ -890,9 +865,7 @@ retry_delete:
 	 * This keeps any tasks waiting on the spin lock from thinking
 	 * they got something (see the lock code above).
 	 */
-	if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
-		put_task_struct(timer->it_process);
-	timer->it_process = NULL;
+	timer->it_signal = NULL;
 
 	unlock_timer(timer, flags);
 	release_posix_timer(timer, IT_ID_SET);
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index dcd165f92a88..23bd4daeb96b 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -96,7 +96,7 @@ config SUSPEND
 
 config PM_TEST_SUSPEND
 	bool "Test suspend/resume and wakealarm during bootup"
-	depends on SUSPEND && PM_DEBUG && RTC_LIB=y
+	depends on SUSPEND && PM_DEBUG && RTC_CLASS=y
 	---help---
 	This option will let you suspend your machine during bootup, and
 	make it wake up a few seconds later using an RTC wakeup alarm.
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index bbd85c60f741..f77d3819ef57 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -14,6 +14,7 @@
 #include <linux/reboot.h>
 #include <linux/string.h>
 #include <linux/device.h>
+#include <linux/kmod.h>
 #include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/mount.h>
@@ -21,7 +22,6 @@
 #include <linux/console.h>
 #include <linux/cpu.h>
 #include <linux/freezer.h>
-#include <linux/ftrace.h>
 
 #include "power.h"
 
@@ -256,7 +256,7 @@ static int create_image(int platform_mode)
 
 int hibernation_snapshot(int platform_mode)
 {
-	int error, ftrace_save;
+	int error;
 
 	/* Free memory before shutting down devices. */
 	error = swsusp_shrink_memory();
@@ -268,7 +268,6 @@ int hibernation_snapshot(int platform_mode)
 		goto Close;
 
 	suspend_console();
-	ftrace_save = __ftrace_enabled_save();
 	error = device_suspend(PMSG_FREEZE);
 	if (error)
 		goto Recover_platform;
@@ -298,7 +297,6 @@ int hibernation_snapshot(int platform_mode)
  Resume_devices:
 	device_resume(in_suspend ?
 		(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
-	__ftrace_enabled_restore(ftrace_save);
 	resume_console();
  Close:
 	platform_end(platform_mode);
@@ -369,11 +367,10 @@ static int resume_target_kernel(void)
 
 int hibernation_restore(int platform_mode)
 {
-	int error, ftrace_save;
+	int error;
 
 	pm_prepare_console();
 	suspend_console();
-	ftrace_save = __ftrace_enabled_save();
 	error = device_suspend(PMSG_QUIESCE);
 	if (error)
 		goto Finish;
@@ -388,7 +385,6 @@ int hibernation_restore(int platform_mode)
 	platform_restore_cleanup(platform_mode);
 	device_resume(PMSG_RECOVER);
  Finish:
-	__ftrace_enabled_restore(ftrace_save);
 	resume_console();
 	pm_restore_console();
 	return error;
@@ -401,7 +397,7 @@ int hibernation_restore(int platform_mode)
 
 int hibernation_platform_enter(void)
 {
-	int error, ftrace_save;
+	int error;
 
 	if (!hibernation_ops)
 		return -ENOSYS;
@@ -416,7 +412,6 @@ int hibernation_platform_enter(void)
 		goto Close;
 
 	suspend_console();
-	ftrace_save = __ftrace_enabled_save();
 	error = device_suspend(PMSG_HIBERNATE);
 	if (error) {
 		if (hibernation_ops->recover)
@@ -451,7 +446,6 @@ int hibernation_platform_enter(void)
 	hibernation_ops->finish();
  Resume_devices:
 	device_resume(PMSG_RESTORE);
-	__ftrace_enabled_restore(ftrace_save);
 	resume_console();
  Close:
 	hibernation_ops->end();
@@ -520,6 +514,10 @@ int hibernate(void)
 	if (error)
 		goto Exit;
 
+	error = usermodehelper_disable();
+	if (error)
+		goto Exit;
+
 	/* Allocate memory management structures */
 	error = create_basic_memory_bitmaps();
 	if (error)
@@ -558,6 +556,7 @@ int hibernate(void)
 	thaw_processes();
  Finish:
 	free_basic_memory_bitmaps();
+	usermodehelper_enable();
  Exit:
 	pm_notifier_call_chain(PM_POST_HIBERNATION);
 	pm_restore_console();
@@ -634,6 +633,10 @@ static int software_resume(void)
 	if (error)
 		goto Finish;
 
+	error = usermodehelper_disable();
+	if (error)
+		goto Finish;
+
 	error = create_basic_memory_bitmaps();
 	if (error)
 		goto Finish;
@@ -641,7 +644,7 @@ static int software_resume(void)
 	pr_debug("PM: Preparing processes for restore.\n");
 	error = prepare_processes();
 	if (error) {
-		swsusp_close();
+		swsusp_close(FMODE_READ);
 		goto Done;
 	}
 
@@ -656,6 +659,7 @@ static int software_resume(void)
 	thaw_processes();
  Done:
 	free_basic_memory_bitmaps();
+	usermodehelper_enable();
  Finish:
 	pm_notifier_call_chain(PM_POST_RESTORE);
 	pm_restore_console();
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 540b16b68565..613f16941b85 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -14,6 +14,7 @@
 #include <linux/string.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
+#include <linux/kmod.h>
 #include <linux/init.h>
 #include <linux/console.h>
 #include <linux/cpu.h>
@@ -21,7 +22,6 @@
 #include <linux/freezer.h>
 #include <linux/vmstat.h>
 #include <linux/syscalls.h>
-#include <linux/ftrace.h>
 
 #include "power.h"
 
@@ -173,7 +173,7 @@ static void suspend_test_finish(const char *label)
 	 * has some performance issues.  The stack dump of a WARN_ON
 	 * is more likely to get the right attention than a printk...
 	 */
-	WARN_ON(msec > (TEST_SUSPEND_SECONDS * 1000));
+	WARN(msec > (TEST_SUSPEND_SECONDS * 1000), "Component: %s\n", label);
 }
 
 #else
@@ -237,6 +237,10 @@ static int suspend_prepare(void)
 	if (error)
 		goto Finish;
 
+	error = usermodehelper_disable();
+	if (error)
+		goto Finish;
+
 	if (suspend_freeze_processes()) {
 		error = -EAGAIN;
 		goto Thaw;
@@ -256,6 +260,7 @@ static int suspend_prepare(void)
 
  Thaw:
 	suspend_thaw_processes();
+	usermodehelper_enable();
  Finish:
 	pm_notifier_call_chain(PM_POST_SUSPEND);
 	pm_restore_console();
@@ -311,7 +316,7 @@ static int suspend_enter(suspend_state_t state)
  */
 int suspend_devices_and_enter(suspend_state_t state)
 {
-	int error, ftrace_save;
+	int error;
 
 	if (!suspend_ops)
 		return -ENOSYS;
@@ -322,7 +327,6 @@ int suspend_devices_and_enter(suspend_state_t state)
 			goto Close;
 	}
 	suspend_console();
-	ftrace_save = __ftrace_enabled_save();
 	suspend_test_start();
 	error = device_suspend(PMSG_SUSPEND);
 	if (error) {
@@ -354,7 +358,6 @@ int suspend_devices_and_enter(suspend_state_t state)
 	suspend_test_start();
 	device_resume(PMSG_RESUME);
 	suspend_test_finish("resume devices");
-	__ftrace_enabled_restore(ftrace_save);
 	resume_console();
  Close:
 	if (suspend_ops->end)
@@ -376,6 +379,7 @@ int suspend_devices_and_enter(suspend_state_t state)
 static void suspend_finish(void)
 {
 	suspend_thaw_processes();
+	usermodehelper_enable();
 	pm_notifier_call_chain(PM_POST_SUSPEND);
 	pm_restore_console();
 }
diff --git a/kernel/power/power.h b/kernel/power/power.h
index acc0c101dbd5..46b5ec7a3afb 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -153,7 +153,7 @@ extern int swsusp_shrink_memory(void);
 extern void swsusp_free(void);
 extern int swsusp_read(unsigned int *flags_p);
 extern int swsusp_write(unsigned int flags);
-extern void swsusp_close(void);
+extern void swsusp_close(fmode_t);
 
 struct timeval;
 /* kernel/power/swsusp.c */
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 278946aecaf0..ca634019497a 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -28,121 +28,6 @@ static inline int freezeable(struct task_struct * p)
 	return 1;
 }
 
-/*
- * freezing is complete, mark current process as frozen
- */
-static inline void frozen_process(void)
-{
-	if (!unlikely(current->flags & PF_NOFREEZE)) {
-		current->flags |= PF_FROZEN;
-		wmb();
-	}
-	clear_freeze_flag(current);
-}
-
-/* Refrigerator is place where frozen processes are stored :-). */
-void refrigerator(void)
-{
-	/* Hmm, should we be allowed to suspend when there are realtime
-	   processes around? */
-	long save;
-
-	task_lock(current);
-	if (freezing(current)) {
-		frozen_process();
-		task_unlock(current);
-	} else {
-		task_unlock(current);
-		return;
-	}
-	save = current->state;
-	pr_debug("%s entered refrigerator\n", current->comm);
-
-	spin_lock_irq(&current->sighand->siglock);
-	recalc_sigpending(); /* We sent fake signal, clean it up */
-	spin_unlock_irq(&current->sighand->siglock);
-
-	for (;;) {
-		set_current_state(TASK_UNINTERRUPTIBLE);
-		if (!frozen(current))
-			break;
-		schedule();
-	}
-	pr_debug("%s left refrigerator\n", current->comm);
-	__set_current_state(save);
-}
-
-static void fake_signal_wake_up(struct task_struct *p)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&p->sighand->siglock, flags);
-	signal_wake_up(p, 0);
-	spin_unlock_irqrestore(&p->sighand->siglock, flags);
-}
-
-static inline bool should_send_signal(struct task_struct *p)
-{
-	return !(p->flags & PF_FREEZER_NOSIG);
-}
-
-/**
- *	freeze_task - send a freeze request to given task
- *	@p: task to send the request to
- *	@sig_only: if set, the request will only be sent if the task has the
- *		PF_FREEZER_NOSIG flag unset
- *	Return value: 'false', if @sig_only is set and the task has
- *		PF_FREEZER_NOSIG set or the task is frozen, 'true', otherwise
- *
- *	The freeze request is sent by setting the tasks's TIF_FREEZE flag and
- *	either sending a fake signal to it or waking it up, depending on whether
- *	or not it has PF_FREEZER_NOSIG set.  If @sig_only is set and the task
- *	has PF_FREEZER_NOSIG set (ie. it is a typical kernel thread), its
- *	TIF_FREEZE flag will not be set.
- */
-static bool freeze_task(struct task_struct *p, bool sig_only)
-{
-	/*
-	 * We first check if the task is freezing and next if it has already
-	 * been frozen to avoid the race with frozen_process() which first marks
-	 * the task as frozen and next clears its TIF_FREEZE.
-	 */
-	if (!freezing(p)) {
-		rmb();
-		if (frozen(p))
-			return false;
-
-		if (!sig_only || should_send_signal(p))
-			set_freeze_flag(p);
-		else
-			return false;
-	}
-
-	if (should_send_signal(p)) {
-		if (!signal_pending(p))
-			fake_signal_wake_up(p);
-	} else if (sig_only) {
-		return false;
-	} else {
-		wake_up_state(p, TASK_INTERRUPTIBLE);
-	}
-
-	return true;
-}
-
-static void cancel_freezing(struct task_struct *p)
-{
-	unsigned long flags;
-
-	if (freezing(p)) {
-		pr_debug("  clean up: %s\n", p->comm);
-		clear_freeze_flag(p);
-		spin_lock_irqsave(&p->sighand->siglock, flags);
-		recalc_sigpending_and_wake(p);
-		spin_unlock_irqrestore(&p->sighand->siglock, flags);
-	}
-}
-
 static int try_to_freeze_tasks(bool sig_only)
 {
 	struct task_struct *g, *p;
@@ -250,6 +135,9 @@ static void thaw_tasks(bool nosig_only)
 		if (nosig_only && should_send_signal(p))
 			continue;
 
+		if (cgroup_frozen(p))
+			continue;
+
 		thaw_process(p);
 	} while_each_thread(g, p);
 	read_unlock(&tasklist_lock);
@@ -264,4 +152,3 @@ void thaw_processes(void)
 	printk("done.\n");
 }
 
-EXPORT_SYMBOL(refrigerator);
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 80ccac849e46..6da14358537c 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -172,13 +172,13 @@ static int swsusp_swap_check(void) /* This is called before saving image */
 		return res;
 
 	root_swap = res;
-	res = blkdev_get(resume_bdev, FMODE_WRITE, O_RDWR);
+	res = blkdev_get(resume_bdev, FMODE_WRITE);
 	if (res)
 		return res;
 
 	res = set_blocksize(resume_bdev, PAGE_SIZE);
 	if (res < 0)
-		blkdev_put(resume_bdev);
+		blkdev_put(resume_bdev, FMODE_WRITE);
 
 	return res;
 }
@@ -426,7 +426,7 @@ int swsusp_write(unsigned int flags)
 
 	release_swap_writer(&handle);
  out:
-	swsusp_close();
+	swsusp_close(FMODE_WRITE);
 	return error;
 }
 
@@ -574,7 +574,7 @@ int swsusp_read(unsigned int *flags_p)
 		error = load_image(&handle, &snapshot, header->pages - 1);
 	release_swap_reader(&handle);
 
-	blkdev_put(resume_bdev);
+	blkdev_put(resume_bdev, FMODE_READ);
 
 	if (!error)
 		pr_debug("PM: Image successfully loaded\n");
@@ -609,7 +609,7 @@ int swsusp_check(void)
 			return -EINVAL;
 		}
 		if (error)
-			blkdev_put(resume_bdev);
+			blkdev_put(resume_bdev, FMODE_READ);
 		else
 			pr_debug("PM: Signature found, resuming\n");
 	} else {
@@ -626,14 +626,14 @@ int swsusp_check(void)
  *	swsusp_close - close swap device.
  */
 
-void swsusp_close(void)
+void swsusp_close(fmode_t mode)
 {
 	if (IS_ERR(resume_bdev)) {
 		pr_debug("PM: Image device not initialised\n");
 		return;
 	}
 
-	blkdev_put(resume_bdev);
+	blkdev_put(resume_bdev, mode);
 }
 
 static int swsusp_header_init(void)
diff --git a/kernel/power/user.c b/kernel/power/user.c
index a6332a313262..005b93d839ba 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -212,13 +212,20 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
 	case SNAPSHOT_FREEZE:
 		if (data->frozen)
 			break;
+
 		printk("Syncing filesystems ... ");
 		sys_sync();
 		printk("done.\n");
 
-		error = freeze_processes();
+		error = usermodehelper_disable();
 		if (error)
+			break;
+
+		error = freeze_processes();
+		if (error) {
 			thaw_processes();
+			usermodehelper_enable();
+		}
 		if (!error)
 			data->frozen = 1;
 		break;
@@ -227,6 +234,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
 		if (!data->frozen || data->ready)
 			break;
 		thaw_processes();
+		usermodehelper_enable();
 		data->frozen = 0;
 		break;
 
diff --git a/kernel/printk.c b/kernel/printk.c
index a430fd04008b..e651ab05655f 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -13,7 +13,7 @@
  * Fixed SMP synchronization, 08/08/99, Manfred Spraul
  *     manfred@colorfullife.com
  * Rewrote bits to get rid of console_lock
- *	01Mar01 Andrew Morton <andrewm@uow.edu.au>
+ *	01Mar01 Andrew Morton
  */
 
 #include <linux/kernel.h>
@@ -233,45 +233,6 @@ static inline void boot_delay_msec(void)
 #endif
 
 /*
- * Return the number of unread characters in the log buffer.
- */
-static int log_buf_get_len(void)
-{
-	return logged_chars;
-}
-
-/*
- * Copy a range of characters from the log buffer.
- */
-int log_buf_copy(char *dest, int idx, int len)
-{
-	int ret, max;
-	bool took_lock = false;
-
-	if (!oops_in_progress) {
-		spin_lock_irq(&logbuf_lock);
-		took_lock = true;
-	}
-
-	max = log_buf_get_len();
-	if (idx < 0 || idx >= max) {
-		ret = -1;
-	} else {
-		if (len > max)
-			len = max;
-		ret = len;
-		idx += (log_end - max);
-		while (len-- > 0)
-			dest[len] = LOG_BUF(idx + len);
-	}
-
-	if (took_lock)
-		spin_unlock_irq(&logbuf_lock);
-
-	return ret;
-}
-
-/*
  * Commands to do_syslog:
  *
  * 	0 -- Close the log.  Currently a NOP.
@@ -577,9 +538,6 @@ static int have_callable_console(void)
  * @fmt: format string
  *
  * This is printk().  It can be called from any context.  We want it to work.
- * Be aware of the fact that if oops_in_progress is not set, we might try to
- * wake klogd up which could deadlock on runqueue lock if printk() is called
- * from scheduler code.
  *
  * We try to grab the console_sem.  If we succeed, it's easy - we log the output and
  * call the console drivers.  If we fail to get the semaphore we place the output
@@ -593,6 +551,8 @@ static int have_callable_console(void)
  *
  * See also:
  * printf(3)
+ *
+ * See the vsnprintf() documentation for format string extensions over C99.
  */
 
 asmlinkage int printk(const char *fmt, ...)
@@ -702,7 +662,7 @@ asmlinkage int vprintk(const char *fmt, va_list args)
 	if (recursion_bug) {
 		recursion_bug = 0;
 		strcpy(printk_buf, recursion_bug_msg);
-		printed_len = sizeof(recursion_bug_msg);
+		printed_len = strlen(recursion_bug_msg);
 	}
 	/* Emit the output into the temporary buffer */
 	printed_len += vscnprintf(printk_buf + printed_len,
@@ -982,10 +942,25 @@ int is_console_locked(void)
 	return console_locked;
 }
 
-void wake_up_klogd(void)
+static DEFINE_PER_CPU(int, printk_pending);
+
+void printk_tick(void)
 {
-	if (!oops_in_progress && waitqueue_active(&log_wait))
+	if (__get_cpu_var(printk_pending)) {
+		__get_cpu_var(printk_pending) = 0;
 		wake_up_interruptible(&log_wait);
+	}
+}
+
+int printk_needs_cpu(int cpu)
+{
+	return per_cpu(printk_pending, cpu);
+}
+
+void wake_up_klogd(void)
+{
+	if (waitqueue_active(&log_wait))
+		__raw_get_cpu_var(printk_pending) = 1;
 }
 
 /**
diff --git a/kernel/profile.c b/kernel/profile.c
index cd26bed4cc26..60adefb59b5e 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -22,6 +22,8 @@
 #include <linux/cpu.h>
 #include <linux/highmem.h>
 #include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
 #include <asm/sections.h>
 #include <asm/irq_regs.h>
 #include <asm/ptrace.h>
@@ -50,11 +52,11 @@ static DEFINE_PER_CPU(int, cpu_profile_flip);
 static DEFINE_MUTEX(profile_flip_mutex);
 #endif /* CONFIG_SMP */
 
-static int __init profile_setup(char *str)
+int profile_setup(char *str)
 {
-	static char __initdata schedstr[] = "schedule";
-	static char __initdata sleepstr[] = "sleep";
-	static char __initdata kvmstr[] = "kvm";
+	static char schedstr[] = "schedule";
+	static char sleepstr[] = "sleep";
+	static char kvmstr[] = "kvm";
 	int par;
 
 	if (!strncmp(str, sleepstr, strlen(sleepstr))) {
@@ -100,14 +102,33 @@ static int __init profile_setup(char *str)
 __setup("profile=", profile_setup);
 
 
-void __init profile_init(void)
+int __ref profile_init(void)
 {
+	int buffer_bytes;
 	if (!prof_on)
-		return;
+		return 0;
 
 	/* only text is profiled */
 	prof_len = (_etext - _stext) >> prof_shift;
-	prof_buffer = alloc_bootmem(prof_len*sizeof(atomic_t));
+	buffer_bytes = prof_len*sizeof(atomic_t);
+	if (!slab_is_available()) {
+		prof_buffer = alloc_bootmem(buffer_bytes);
+		return 0;
+	}
+
+	prof_buffer = kzalloc(buffer_bytes, GFP_KERNEL);
+	if (prof_buffer)
+		return 0;
+
+	prof_buffer = alloc_pages_exact(buffer_bytes, GFP_KERNEL|__GFP_ZERO);
+	if (prof_buffer)
+		return 0;
+
+	prof_buffer = vmalloc(buffer_bytes);
+	if (prof_buffer)
+		return 0;
+
+	return -ENOMEM;
 }
 
 /* Profile event notifications */
@@ -330,7 +351,7 @@ out:
 	put_cpu();
 }
 
-static int __devinit profile_cpu_callback(struct notifier_block *info,
+static int __cpuinit profile_cpu_callback(struct notifier_block *info,
 					unsigned long action, void *__cpu)
 {
 	int node, cpu = (unsigned long)__cpu;
@@ -523,11 +544,11 @@ static const struct file_operations proc_profile_operations = {
 };
 
 #ifdef CONFIG_SMP
-static void __init profile_nop(void *unused)
+static void profile_nop(void *unused)
 {
 }
 
-static int __init create_hash_tables(void)
+static int create_hash_tables(void)
 {
 	int cpu;
 
@@ -575,14 +596,14 @@ out_cleanup:
 #define create_hash_tables()			({ 0; })
 #endif
 
-static int __init create_proc_profile(void)
+int __ref create_proc_profile(void) /* false positive from hotcpu_notifier */
 {
 	struct proc_dir_entry *entry;
 
 	if (!prof_on)
 		return 0;
 	if (create_hash_tables())
-		return -1;
+		return -ENOMEM;
 	entry = proc_create("profile", S_IWUSR | S_IRUGO,
 			    NULL, &proc_profile_operations);
 	if (!entry)
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 356699a96d56..29dc700e198c 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -25,6 +25,17 @@
 #include <asm/pgtable.h>
 #include <asm/uaccess.h>
 
+
+/*
+ * Initialize a new task whose father had been ptraced.
+ *
+ * Called from copy_process().
+ */
+void ptrace_fork(struct task_struct *child, unsigned long clone_flags)
+{
+	arch_ptrace_fork(child, clone_flags);
+}
+
 /*
  * ptrace a task: make the debugger its new parent and
  * move it to the ptrace list.
@@ -45,7 +56,7 @@ void __ptrace_link(struct task_struct *child, struct task_struct *new_parent)
  * TASK_TRACED, resume it now.
  * Requires that irqs be disabled.
  */
-void ptrace_untrace(struct task_struct *child)
+static void ptrace_untrace(struct task_struct *child)
 {
 	spin_lock(&child->sighand->siglock);
 	if (task_is_traced(child)) {
@@ -72,6 +83,7 @@ void __ptrace_unlink(struct task_struct *child)
 	child->parent = child->real_parent;
 	list_del_init(&child->ptrace_entry);
 
+	arch_ptrace_untrace(child);
 	if (task_is_traced(child))
 		ptrace_untrace(child);
 }
@@ -115,6 +127,8 @@ int ptrace_check_attach(struct task_struct *child, int kill)
 
 int __ptrace_may_access(struct task_struct *task, unsigned int mode)
 {
+	const struct cred *cred = current_cred(), *tcred;
+
 	/* May we inspect the given task?
 	 * This check is used both for attaching with ptrace
 	 * and for allowing access to sensitive information in /proc.
@@ -127,13 +141,19 @@ int __ptrace_may_access(struct task_struct *task, unsigned int mode)
 	/* Don't let security modules deny introspection */
 	if (task == current)
 		return 0;
-	if (((current->uid != task->euid) ||
-	     (current->uid != task->suid) ||
-	     (current->uid != task->uid) ||
-	     (current->gid != task->egid) ||
-	     (current->gid != task->sgid) ||
-	     (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))
+	rcu_read_lock();
+	tcred = __task_cred(task);
+	if ((cred->uid != tcred->euid ||
+	     cred->uid != tcred->suid ||
+	     cred->uid != tcred->uid  ||
+	     cred->gid != tcred->egid ||
+	     cred->gid != tcred->sgid ||
+	     cred->gid != tcred->gid) &&
+	    !capable(CAP_SYS_PTRACE)) {
+		rcu_read_unlock();
 		return -EPERM;
+	}
+	rcu_read_unlock();
 	smp_rmb();
 	if (task->mm)
 		dumpable = get_dumpable(task->mm);
@@ -163,6 +183,14 @@ int ptrace_attach(struct task_struct *task)
 	if (same_thread_group(task, current))
 		goto out;
 
+	/* Protect exec's credential calculations against our interference;
+	 * SUID, SGID and LSM creds get determined differently under ptrace.
+	 */
+	retval = mutex_lock_interruptible(&current->cred_exec_mutex);
+	if (retval  < 0)
+		goto out;
+
+	retval = -EPERM;
 repeat:
 	/*
 	 * Nasty, nasty.
@@ -202,6 +230,7 @@ repeat:
 bad:
 	write_unlock_irqrestore(&tasklist_lock, flags);
 	task_unlock(task);
+	mutex_unlock(&current->cred_exec_mutex);
 out:
 	return retval;
 }
@@ -612,7 +641,7 @@ int generic_ptrace_pokedata(struct task_struct *tsk, long addr, long data)
 	return (copied == sizeof(data)) ? 0 : -EIO;
 }
 
-#if defined CONFIG_COMPAT && defined __ARCH_WANT_COMPAT_SYS_PTRACE
+#if defined CONFIG_COMPAT
 #include <linux/compat.h>
 
 int compat_ptrace_request(struct task_struct *child, compat_long_t request,
@@ -709,4 +738,4 @@ asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 	unlock_kernel();
 	return ret;
 }
-#endif	/* CONFIG_COMPAT && __ARCH_WANT_COMPAT_SYS_PTRACE */
+#endif	/* CONFIG_COMPAT */
diff --git a/kernel/rcuclassic.c b/kernel/rcuclassic.c
index 37f72e551542..e503a002f330 100644
--- a/kernel/rcuclassic.c
+++ b/kernel/rcuclassic.c
@@ -191,7 +191,7 @@ static void print_other_cpu_stall(struct rcu_ctrlblk *rcp)
 
 	/* OK, time to rat on our buddy... */
 
-	printk(KERN_ERR "RCU detected CPU stalls:");
+	printk(KERN_ERR "INFO: RCU detected CPU stalls:");
 	for_each_possible_cpu(cpu) {
 		if (cpu_isset(cpu, rcp->cpumask))
 			printk(" %d", cpu);
@@ -204,7 +204,7 @@ static void print_cpu_stall(struct rcu_ctrlblk *rcp)
 {
 	unsigned long flags;
 
-	printk(KERN_ERR "RCU detected CPU %d stall (t=%lu/%lu jiffies)\n",
+	printk(KERN_ERR "INFO: RCU detected CPU %d stall (t=%lu/%lu jiffies)\n",
 			smp_processor_id(), jiffies,
 			jiffies - rcp->gp_start);
 	dump_stack();
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 467d5940f624..ad63af8b2521 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -119,18 +119,19 @@ static void _rcu_barrier(enum rcu_barrier type)
 	/* Take cpucontrol mutex to protect against CPU hotplug */
 	mutex_lock(&rcu_barrier_mutex);
 	init_completion(&rcu_barrier_completion);
-	atomic_set(&rcu_barrier_cpu_count, 0);
 	/*
-	 * The queueing of callbacks in all CPUs must be atomic with
-	 * respect to RCU, otherwise one CPU may queue a callback,
-	 * wait for a grace period, decrement barrier count and call
-	 * complete(), while other CPUs have not yet queued anything.
-	 * So, we need to make sure that grace periods cannot complete
-	 * until all the callbacks are queued.
+	 * Initialize rcu_barrier_cpu_count to 1, then invoke
+	 * rcu_barrier_func() on each CPU, so that each CPU also has
+	 * incremented rcu_barrier_cpu_count.  Only then is it safe to
+	 * decrement rcu_barrier_cpu_count -- otherwise the first CPU
+	 * might complete its grace period before all of the other CPUs
+	 * did their increment, causing this function to return too
+	 * early.
 	 */
-	rcu_read_lock();
+	atomic_set(&rcu_barrier_cpu_count, 1);
 	on_each_cpu(rcu_barrier_func, (void *)type, 1);
-	rcu_read_unlock();
+	if (atomic_dec_and_test(&rcu_barrier_cpu_count))
+		complete(&rcu_barrier_completion);
 	wait_for_completion(&rcu_barrier_completion);
 	mutex_unlock(&rcu_barrier_mutex);
 }
diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
index ca4bbbe04aa4..04982659875a 100644
--- a/kernel/rcupreempt.c
+++ b/kernel/rcupreempt.c
@@ -54,9 +54,9 @@
 #include <linux/cpu.h>
 #include <linux/random.h>
 #include <linux/delay.h>
-#include <linux/byteorder/swabb.h>
 #include <linux/cpumask.h>
 #include <linux/rcupreempt_trace.h>
+#include <asm/byteorder.h>
 
 /*
  * PREEMPT_RCU data structures.
@@ -551,6 +551,16 @@ void rcu_irq_exit(void)
 	}
 }
 
+void rcu_nmi_enter(void)
+{
+	rcu_irq_enter();
+}
+
+void rcu_nmi_exit(void)
+{
+	rcu_irq_exit();
+}
+
 static void dyntick_save_progress_counter(int cpu)
 {
 	struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
diff --git a/kernel/rcupreempt_trace.c b/kernel/rcupreempt_trace.c
index 35c2d3360ecf..7c2665cac172 100644
--- a/kernel/rcupreempt_trace.c
+++ b/kernel/rcupreempt_trace.c
@@ -149,12 +149,12 @@ static void rcupreempt_trace_sum(struct rcupreempt_trace *sp)
 		sp->done_length += cp->done_length;
 		sp->done_add += cp->done_add;
 		sp->done_remove += cp->done_remove;
-		atomic_set(&sp->done_invoked, atomic_read(&cp->done_invoked));
+		atomic_add(atomic_read(&cp->done_invoked), &sp->done_invoked);
 		sp->rcu_check_callbacks += cp->rcu_check_callbacks;
-		atomic_set(&sp->rcu_try_flip_1,
-			   atomic_read(&cp->rcu_try_flip_1));
-		atomic_set(&sp->rcu_try_flip_e1,
-			   atomic_read(&cp->rcu_try_flip_e1));
+		atomic_add(atomic_read(&cp->rcu_try_flip_1),
+			   &sp->rcu_try_flip_1);
+		atomic_add(atomic_read(&cp->rcu_try_flip_e1),
+			   &sp->rcu_try_flip_e1);
 		sp->rcu_try_flip_i1 += cp->rcu_try_flip_i1;
 		sp->rcu_try_flip_ie1 += cp->rcu_try_flip_ie1;
 		sp->rcu_try_flip_g1 += cp->rcu_try_flip_g1;
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 90b5b123f7a1..b31065522104 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -39,13 +39,14 @@
 #include <linux/moduleparam.h>
 #include <linux/percpu.h>
 #include <linux/notifier.h>
+#include <linux/reboot.h>
 #include <linux/freezer.h>
 #include <linux/cpu.h>
 #include <linux/delay.h>
-#include <linux/byteorder/swabb.h>
 #include <linux/stat.h>
 #include <linux/srcu.h>
 #include <linux/slab.h>
+#include <asm/byteorder.h>
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and "
@@ -108,7 +109,6 @@ struct rcu_torture {
 	int rtort_mbtest;
 };
 
-static int fullstop = 0;	/* stop generating callbacks at test end. */
 static LIST_HEAD(rcu_torture_freelist);
 static struct rcu_torture *rcu_torture_current = NULL;
 static long rcu_torture_current_version = 0;
@@ -136,6 +136,30 @@ static int stutter_pause_test = 0;
 #endif
 int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT;
 
+#define FULLSTOP_SIGNALED 1	/* Bail due to signal. */
+#define FULLSTOP_CLEANUP  2	/* Orderly shutdown. */
+static int fullstop;		/* stop generating callbacks at test end. */
+DEFINE_MUTEX(fullstop_mutex);	/* protect fullstop transitions and */
+				/*  spawning of kthreads. */
+
+/*
+ * Detect and respond to a signal-based shutdown.
+ */
+static int
+rcutorture_shutdown_notify(struct notifier_block *unused1,
+			   unsigned long unused2, void *unused3)
+{
+	if (fullstop)
+		return NOTIFY_DONE;
+	if (signal_pending(current)) {
+		mutex_lock(&fullstop_mutex);
+		if (!ACCESS_ONCE(fullstop))
+			fullstop = FULLSTOP_SIGNALED;
+		mutex_unlock(&fullstop_mutex);
+	}
+	return NOTIFY_DONE;
+}
+
 /*
  * Allocate an element from the rcu_tortures pool.
  */
@@ -199,11 +223,12 @@ rcu_random(struct rcu_random_state *rrsp)
 static void
 rcu_stutter_wait(void)
 {
-	while (stutter_pause_test || !rcutorture_runnable)
+	while ((stutter_pause_test || !rcutorture_runnable) && !fullstop) {
 		if (rcutorture_runnable)
 			schedule_timeout_interruptible(1);
 		else
 			schedule_timeout_interruptible(round_jiffies_relative(HZ));
+	}
 }
 
 /*
@@ -599,7 +624,7 @@ rcu_torture_writer(void *arg)
 		rcu_stutter_wait();
 	} while (!kthread_should_stop() && !fullstop);
 	VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping");
-	while (!kthread_should_stop())
+	while (!kthread_should_stop() && fullstop != FULLSTOP_SIGNALED)
 		schedule_timeout_uninterruptible(1);
 	return 0;
 }
@@ -624,7 +649,7 @@ rcu_torture_fakewriter(void *arg)
 	} while (!kthread_should_stop() && !fullstop);
 
 	VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping");
-	while (!kthread_should_stop())
+	while (!kthread_should_stop() && fullstop != FULLSTOP_SIGNALED)
 		schedule_timeout_uninterruptible(1);
 	return 0;
 }
@@ -734,7 +759,7 @@ rcu_torture_reader(void *arg)
 	VERBOSE_PRINTK_STRING("rcu_torture_reader task stopping");
 	if (irqreader && cur_ops->irqcapable)
 		del_timer_sync(&t);
-	while (!kthread_should_stop())
+	while (!kthread_should_stop() && fullstop != FULLSTOP_SIGNALED)
 		schedule_timeout_uninterruptible(1);
 	return 0;
 }
@@ -831,7 +856,7 @@ rcu_torture_stats(void *arg)
 	do {
 		schedule_timeout_interruptible(stat_interval * HZ);
 		rcu_torture_stats_print();
-	} while (!kthread_should_stop());
+	} while (!kthread_should_stop() && !fullstop);
 	VERBOSE_PRINTK_STRING("rcu_torture_stats task stopping");
 	return 0;
 }
@@ -899,7 +924,7 @@ rcu_torture_shuffle(void *arg)
 	do {
 		schedule_timeout_interruptible(shuffle_interval * HZ);
 		rcu_torture_shuffle_tasks();
-	} while (!kthread_should_stop());
+	} while (!kthread_should_stop() && !fullstop);
 	VERBOSE_PRINTK_STRING("rcu_torture_shuffle task stopping");
 	return 0;
 }
@@ -914,10 +939,10 @@ rcu_torture_stutter(void *arg)
 	do {
 		schedule_timeout_interruptible(stutter * HZ);
 		stutter_pause_test = 1;
-		if (!kthread_should_stop())
+		if (!kthread_should_stop() && !fullstop)
 			schedule_timeout_interruptible(stutter * HZ);
 		stutter_pause_test = 0;
-	} while (!kthread_should_stop());
+	} while (!kthread_should_stop() && !fullstop);
 	VERBOSE_PRINTK_STRING("rcu_torture_stutter task stopping");
 	return 0;
 }
@@ -934,12 +959,27 @@ rcu_torture_print_module_parms(char *tag)
 		stutter, irqreader);
 }
 
+static struct notifier_block rcutorture_nb = {
+	.notifier_call = rcutorture_shutdown_notify,
+};
+
 static void
 rcu_torture_cleanup(void)
 {
 	int i;
 
-	fullstop = 1;
+	mutex_lock(&fullstop_mutex);
+	if (!fullstop) {
+		/* If being signaled, let it happen, then exit. */
+		mutex_unlock(&fullstop_mutex);
+		schedule_timeout_interruptible(10 * HZ);
+		if (cur_ops->cb_barrier != NULL)
+			cur_ops->cb_barrier();
+		return;
+	}
+	fullstop = FULLSTOP_CLEANUP;
+	mutex_unlock(&fullstop_mutex);
+	unregister_reboot_notifier(&rcutorture_nb);
 	if (stutter_task) {
 		VERBOSE_PRINTK_STRING("Stopping rcu_torture_stutter task");
 		kthread_stop(stutter_task);
@@ -1015,6 +1055,8 @@ rcu_torture_init(void)
 		{ &rcu_ops, &rcu_sync_ops, &rcu_bh_ops, &rcu_bh_sync_ops,
 		  &srcu_ops, &sched_ops, &sched_ops_sync, };
 
+	mutex_lock(&fullstop_mutex);
+
 	/* Process args and tell the world that the torturer is on the job. */
 	for (i = 0; i < ARRAY_SIZE(torture_ops); i++) {
 		cur_ops = torture_ops[i];
@@ -1024,6 +1066,7 @@ rcu_torture_init(void)
 	if (i == ARRAY_SIZE(torture_ops)) {
 		printk(KERN_ALERT "rcutorture: invalid torture type: \"%s\"\n",
 		       torture_type);
+		mutex_unlock(&fullstop_mutex);
 		return (-EINVAL);
 	}
 	if (cur_ops->init)
@@ -1146,9 +1189,12 @@ rcu_torture_init(void)
 			goto unwind;
 		}
 	}
+	register_reboot_notifier(&rcutorture_nb);
+	mutex_unlock(&fullstop_mutex);
 	return 0;
 
 unwind:
+	mutex_unlock(&fullstop_mutex);
 	rcu_torture_cleanup();
 	return firsterr;
 }
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
new file mode 100644
index 000000000000..a342b032112c
--- /dev/null
+++ b/kernel/rcutree.c
@@ -0,0 +1,1535 @@
+/*
+ * Read-Copy Update mechanism for mutual exclusion
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright IBM Corporation, 2008
+ *
+ * Authors: Dipankar Sarma <dipankar@in.ibm.com>
+ *	    Manfred Spraul <manfred@colorfullife.com>
+ *	    Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical version
+ *
+ * Based on the original work by Paul McKenney <paulmck@us.ibm.com>
+ * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
+ *
+ * For detailed explanation of Read-Copy Update mechanism see -
+ * 	Documentation/RCU
+ */
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/smp.h>
+#include <linux/rcupdate.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <asm/atomic.h>
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include <linux/completion.h>
+#include <linux/moduleparam.h>
+#include <linux/percpu.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
+#include <linux/mutex.h>
+#include <linux/time.h>
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static struct lock_class_key rcu_lock_key;
+struct lockdep_map rcu_lock_map =
+	STATIC_LOCKDEP_MAP_INIT("rcu_read_lock", &rcu_lock_key);
+EXPORT_SYMBOL_GPL(rcu_lock_map);
+#endif
+
+/* Data structures. */
+
+#define RCU_STATE_INITIALIZER(name) { \
+	.level = { &name.node[0] }, \
+	.levelcnt = { \
+		NUM_RCU_LVL_0,  /* root of hierarchy. */ \
+		NUM_RCU_LVL_1, \
+		NUM_RCU_LVL_2, \
+		NUM_RCU_LVL_3, /* == MAX_RCU_LVLS */ \
+	}, \
+	.signaled = RCU_SIGNAL_INIT, \
+	.gpnum = -300, \
+	.completed = -300, \
+	.onofflock = __SPIN_LOCK_UNLOCKED(&name.onofflock), \
+	.fqslock = __SPIN_LOCK_UNLOCKED(&name.fqslock), \
+	.n_force_qs = 0, \
+	.n_force_qs_ngp = 0, \
+}
+
+struct rcu_state rcu_state = RCU_STATE_INITIALIZER(rcu_state);
+DEFINE_PER_CPU(struct rcu_data, rcu_data);
+
+struct rcu_state rcu_bh_state = RCU_STATE_INITIALIZER(rcu_bh_state);
+DEFINE_PER_CPU(struct rcu_data, rcu_bh_data);
+
+#ifdef CONFIG_NO_HZ
+DEFINE_PER_CPU(struct rcu_dynticks, rcu_dynticks);
+#endif /* #ifdef CONFIG_NO_HZ */
+
+static int blimit = 10;		/* Maximum callbacks per softirq. */
+static int qhimark = 10000;	/* If this many pending, ignore blimit. */
+static int qlowmark = 100;	/* Once only this many pending, use blimit. */
+
+static void force_quiescent_state(struct rcu_state *rsp, int relaxed);
+
+/*
+ * Return the number of RCU batches processed thus far for debug & stats.
+ */
+long rcu_batches_completed(void)
+{
+	return rcu_state.completed;
+}
+EXPORT_SYMBOL_GPL(rcu_batches_completed);
+
+/*
+ * Return the number of RCU BH batches processed thus far for debug & stats.
+ */
+long rcu_batches_completed_bh(void)
+{
+	return rcu_bh_state.completed;
+}
+EXPORT_SYMBOL_GPL(rcu_batches_completed_bh);
+
+/*
+ * Does the CPU have callbacks ready to be invoked?
+ */
+static int
+cpu_has_callbacks_ready_to_invoke(struct rcu_data *rdp)
+{
+	return &rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL];
+}
+
+/*
+ * Does the current CPU require a yet-as-unscheduled grace period?
+ */
+static int
+cpu_needs_another_gp(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+	/* ACCESS_ONCE() because we are accessing outside of lock. */
+	return *rdp->nxttail[RCU_DONE_TAIL] &&
+	       ACCESS_ONCE(rsp->completed) == ACCESS_ONCE(rsp->gpnum);
+}
+
+/*
+ * Return the root node of the specified rcu_state structure.
+ */
+static struct rcu_node *rcu_get_root(struct rcu_state *rsp)
+{
+	return &rsp->node[0];
+}
+
+#ifdef CONFIG_SMP
+
+/*
+ * If the specified CPU is offline, tell the caller that it is in
+ * a quiescent state.  Otherwise, whack it with a reschedule IPI.
+ * Grace periods can end up waiting on an offline CPU when that
+ * CPU is in the process of coming online -- it will be added to the
+ * rcu_node bitmasks before it actually makes it online.  The same thing
+ * can happen while a CPU is in the process of coming online.  Because this
+ * race is quite rare, we check for it after detecting that the grace
+ * period has been delayed rather than checking each and every CPU
+ * each and every time we start a new grace period.
+ */
+static int rcu_implicit_offline_qs(struct rcu_data *rdp)
+{
+	/*
+	 * If the CPU is offline, it is in a quiescent state.  We can
+	 * trust its state not to change because interrupts are disabled.
+	 */
+	if (cpu_is_offline(rdp->cpu)) {
+		rdp->offline_fqs++;
+		return 1;
+	}
+
+	/* The CPU is online, so send it a reschedule IPI. */
+	if (rdp->cpu != smp_processor_id())
+		smp_send_reschedule(rdp->cpu);
+	else
+		set_need_resched();
+	rdp->resched_ipi++;
+	return 0;
+}
+
+#endif /* #ifdef CONFIG_SMP */
+
+#ifdef CONFIG_NO_HZ
+static DEFINE_RATELIMIT_STATE(rcu_rs, 10 * HZ, 5);
+
+/**
+ * rcu_enter_nohz - inform RCU that current CPU is entering nohz
+ *
+ * Enter nohz mode, in other words, -leave- the mode in which RCU
+ * read-side critical sections can occur.  (Though RCU read-side
+ * critical sections can occur in irq handlers in nohz mode, a possibility
+ * handled by rcu_irq_enter() and rcu_irq_exit()).
+ */
+void rcu_enter_nohz(void)
+{
+	unsigned long flags;
+	struct rcu_dynticks *rdtp;
+
+	smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */
+	local_irq_save(flags);
+	rdtp = &__get_cpu_var(rcu_dynticks);
+	rdtp->dynticks++;
+	rdtp->dynticks_nesting--;
+	WARN_ON_RATELIMIT(rdtp->dynticks & 0x1, &rcu_rs);
+	local_irq_restore(flags);
+}
+
+/*
+ * rcu_exit_nohz - inform RCU that current CPU is leaving nohz
+ *
+ * Exit nohz mode, in other words, -enter- the mode in which RCU
+ * read-side critical sections normally occur.
+ */
+void rcu_exit_nohz(void)
+{
+	unsigned long flags;
+	struct rcu_dynticks *rdtp;
+
+	local_irq_save(flags);
+	rdtp = &__get_cpu_var(rcu_dynticks);
+	rdtp->dynticks++;
+	rdtp->dynticks_nesting++;
+	WARN_ON_RATELIMIT(!(rdtp->dynticks & 0x1), &rcu_rs);
+	local_irq_restore(flags);
+	smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
+}
+
+/**
+ * rcu_nmi_enter - inform RCU of entry to NMI context
+ *
+ * If the CPU was idle with dynamic ticks active, and there is no
+ * irq handler running, this updates rdtp->dynticks_nmi to let the
+ * RCU grace-period handling know that the CPU is active.
+ */
+void rcu_nmi_enter(void)
+{
+	struct rcu_dynticks *rdtp = &__get_cpu_var(rcu_dynticks);
+
+	if (rdtp->dynticks & 0x1)
+		return;
+	rdtp->dynticks_nmi++;
+	WARN_ON_RATELIMIT(!(rdtp->dynticks_nmi & 0x1), &rcu_rs);
+	smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
+}
+
+/**
+ * rcu_nmi_exit - inform RCU of exit from NMI context
+ *
+ * If the CPU was idle with dynamic ticks active, and there is no
+ * irq handler running, this updates rdtp->dynticks_nmi to let the
+ * RCU grace-period handling know that the CPU is no longer active.
+ */
+void rcu_nmi_exit(void)
+{
+	struct rcu_dynticks *rdtp = &__get_cpu_var(rcu_dynticks);
+
+	if (rdtp->dynticks & 0x1)
+		return;
+	smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */
+	rdtp->dynticks_nmi++;
+	WARN_ON_RATELIMIT(rdtp->dynticks_nmi & 0x1, &rcu_rs);
+}
+
+/**
+ * rcu_irq_enter - inform RCU of entry to hard irq context
+ *
+ * If the CPU was idle with dynamic ticks active, this updates the
+ * rdtp->dynticks to let the RCU handling know that the CPU is active.
+ */
+void rcu_irq_enter(void)
+{
+	struct rcu_dynticks *rdtp = &__get_cpu_var(rcu_dynticks);
+
+	if (rdtp->dynticks_nesting++)
+		return;
+	rdtp->dynticks++;
+	WARN_ON_RATELIMIT(!(rdtp->dynticks & 0x1), &rcu_rs);
+	smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
+}
+
+/**
+ * rcu_irq_exit - inform RCU of exit from hard irq context
+ *
+ * If the CPU was idle with dynamic ticks active, update the rdp->dynticks
+ * to put let the RCU handling be aware that the CPU is going back to idle
+ * with no ticks.
+ */
+void rcu_irq_exit(void)
+{
+	struct rcu_dynticks *rdtp = &__get_cpu_var(rcu_dynticks);
+
+	if (--rdtp->dynticks_nesting)
+		return;
+	smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */
+	rdtp->dynticks++;
+	WARN_ON_RATELIMIT(rdtp->dynticks & 0x1, &rcu_rs);
+
+	/* If the interrupt queued a callback, get out of dyntick mode. */
+	if (__get_cpu_var(rcu_data).nxtlist ||
+	    __get_cpu_var(rcu_bh_data).nxtlist)
+		set_need_resched();
+}
+
+/*
+ * Record the specified "completed" value, which is later used to validate
+ * dynticks counter manipulations.  Specify "rsp->completed - 1" to
+ * unconditionally invalidate any future dynticks manipulations (which is
+ * useful at the beginning of a grace period).
+ */
+static void dyntick_record_completed(struct rcu_state *rsp, long comp)
+{
+	rsp->dynticks_completed = comp;
+}
+
+#ifdef CONFIG_SMP
+
+/*
+ * Recall the previously recorded value of the completion for dynticks.
+ */
+static long dyntick_recall_completed(struct rcu_state *rsp)
+{
+	return rsp->dynticks_completed;
+}
+
+/*
+ * Snapshot the specified CPU's dynticks counter so that we can later
+ * credit them with an implicit quiescent state.  Return 1 if this CPU
+ * is already in a quiescent state courtesy of dynticks idle mode.
+ */
+static int dyntick_save_progress_counter(struct rcu_data *rdp)
+{
+	int ret;
+	int snap;
+	int snap_nmi;
+
+	snap = rdp->dynticks->dynticks;
+	snap_nmi = rdp->dynticks->dynticks_nmi;
+	smp_mb();	/* Order sampling of snap with end of grace period. */
+	rdp->dynticks_snap = snap;
+	rdp->dynticks_nmi_snap = snap_nmi;
+	ret = ((snap & 0x1) == 0) && ((snap_nmi & 0x1) == 0);
+	if (ret)
+		rdp->dynticks_fqs++;
+	return ret;
+}
+
+/*
+ * Return true if the specified CPU has passed through a quiescent
+ * state by virtue of being in or having passed through an dynticks
+ * idle state since the last call to dyntick_save_progress_counter()
+ * for this same CPU.
+ */
+static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)
+{
+	long curr;
+	long curr_nmi;
+	long snap;
+	long snap_nmi;
+
+	curr = rdp->dynticks->dynticks;
+	snap = rdp->dynticks_snap;
+	curr_nmi = rdp->dynticks->dynticks_nmi;
+	snap_nmi = rdp->dynticks_nmi_snap;
+	smp_mb(); /* force ordering with cpu entering/leaving dynticks. */
+
+	/*
+	 * If the CPU passed through or entered a dynticks idle phase with
+	 * no active irq/NMI handlers, then we can safely pretend that the CPU
+	 * already acknowledged the request to pass through a quiescent
+	 * state.  Either way, that CPU cannot possibly be in an RCU
+	 * read-side critical section that started before the beginning
+	 * of the current RCU grace period.
+	 */
+	if ((curr != snap || (curr & 0x1) == 0) &&
+	    (curr_nmi != snap_nmi || (curr_nmi & 0x1) == 0)) {
+		rdp->dynticks_fqs++;
+		return 1;
+	}
+
+	/* Go check for the CPU being offline. */
+	return rcu_implicit_offline_qs(rdp);
+}
+
+#endif /* #ifdef CONFIG_SMP */
+
+#else /* #ifdef CONFIG_NO_HZ */
+
+static void dyntick_record_completed(struct rcu_state *rsp, long comp)
+{
+}
+
+#ifdef CONFIG_SMP
+
+/*
+ * If there are no dynticks, then the only way that a CPU can passively
+ * be in a quiescent state is to be offline.  Unlike dynticks idle, which
+ * is a point in time during the prior (already finished) grace period,
+ * an offline CPU is always in a quiescent state, and thus can be
+ * unconditionally applied.  So just return the current value of completed.
+ */
+static long dyntick_recall_completed(struct rcu_state *rsp)
+{
+	return rsp->completed;
+}
+
+static int dyntick_save_progress_counter(struct rcu_data *rdp)
+{
+	return 0;
+}
+
+static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)
+{
+	return rcu_implicit_offline_qs(rdp);
+}
+
+#endif /* #ifdef CONFIG_SMP */
+
+#endif /* #else #ifdef CONFIG_NO_HZ */
+
+#ifdef CONFIG_RCU_CPU_STALL_DETECTOR
+
+static void record_gp_stall_check_time(struct rcu_state *rsp)
+{
+	rsp->gp_start = jiffies;
+	rsp->jiffies_stall = jiffies + RCU_SECONDS_TILL_STALL_CHECK;
+}
+
+static void print_other_cpu_stall(struct rcu_state *rsp)
+{
+	int cpu;
+	long delta;
+	unsigned long flags;
+	struct rcu_node *rnp = rcu_get_root(rsp);
+	struct rcu_node *rnp_cur = rsp->level[NUM_RCU_LVLS - 1];
+	struct rcu_node *rnp_end = &rsp->node[NUM_RCU_NODES];
+
+	/* Only let one CPU complain about others per time interval. */
+
+	spin_lock_irqsave(&rnp->lock, flags);
+	delta = jiffies - rsp->jiffies_stall;
+	if (delta < RCU_STALL_RAT_DELAY || rsp->gpnum == rsp->completed) {
+		spin_unlock_irqrestore(&rnp->lock, flags);
+		return;
+	}
+	rsp->jiffies_stall = jiffies + RCU_SECONDS_TILL_STALL_RECHECK;
+	spin_unlock_irqrestore(&rnp->lock, flags);
+
+	/* OK, time to rat on our buddy... */
+
+	printk(KERN_ERR "INFO: RCU detected CPU stalls:");
+	for (; rnp_cur < rnp_end; rnp_cur++) {
+		if (rnp_cur->qsmask == 0)
+			continue;
+		for (cpu = 0; cpu <= rnp_cur->grphi - rnp_cur->grplo; cpu++)
+			if (rnp_cur->qsmask & (1UL << cpu))
+				printk(" %d", rnp_cur->grplo + cpu);
+	}
+	printk(" (detected by %d, t=%ld jiffies)\n",
+	       smp_processor_id(), (long)(jiffies - rsp->gp_start));
+	force_quiescent_state(rsp, 0);  /* Kick them all. */
+}
+
+static void print_cpu_stall(struct rcu_state *rsp)
+{
+	unsigned long flags;
+	struct rcu_node *rnp = rcu_get_root(rsp);
+
+	printk(KERN_ERR "INFO: RCU detected CPU %d stall (t=%lu jiffies)\n",
+			smp_processor_id(), jiffies - rsp->gp_start);
+	dump_stack();
+	spin_lock_irqsave(&rnp->lock, flags);
+	if ((long)(jiffies - rsp->jiffies_stall) >= 0)
+		rsp->jiffies_stall =
+			jiffies + RCU_SECONDS_TILL_STALL_RECHECK;
+	spin_unlock_irqrestore(&rnp->lock, flags);
+	set_need_resched();  /* kick ourselves to get things going. */
+}
+
+static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+	long delta;
+	struct rcu_node *rnp;
+
+	delta = jiffies - rsp->jiffies_stall;
+	rnp = rdp->mynode;
+	if ((rnp->qsmask & rdp->grpmask) && delta >= 0) {
+
+		/* We haven't checked in, so go dump stack. */
+		print_cpu_stall(rsp);
+
+	} else if (rsp->gpnum != rsp->completed &&
+		   delta >= RCU_STALL_RAT_DELAY) {
+
+		/* They had two time units to dump stack, so complain. */
+		print_other_cpu_stall(rsp);
+	}
+}
+
+#else /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
+
+static void record_gp_stall_check_time(struct rcu_state *rsp)
+{
+}
+
+static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+}
+
+#endif /* #else #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
+
+/*
+ * Update CPU-local rcu_data state to record the newly noticed grace period.
+ * This is used both when we started the grace period and when we notice
+ * that someone else started the grace period.
+ */
+static void note_new_gpnum(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+	rdp->qs_pending = 1;
+	rdp->passed_quiesc = 0;
+	rdp->gpnum = rsp->gpnum;
+	rdp->n_rcu_pending_force_qs = rdp->n_rcu_pending +
+				      RCU_JIFFIES_TILL_FORCE_QS;
+}
+
+/*
+ * Did someone else start a new RCU grace period start since we last
+ * checked?  Update local state appropriately if so.  Must be called
+ * on the CPU corresponding to rdp.
+ */
+static int
+check_for_new_grace_period(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+	unsigned long flags;
+	int ret = 0;
+
+	local_irq_save(flags);
+	if (rdp->gpnum != rsp->gpnum) {
+		note_new_gpnum(rsp, rdp);
+		ret = 1;
+	}
+	local_irq_restore(flags);
+	return ret;
+}
+
+/*
+ * Start a new RCU grace period if warranted, re-initializing the hierarchy
+ * in preparation for detecting the next grace period.  The caller must hold
+ * the root node's ->lock, which is released before return.  Hard irqs must
+ * be disabled.
+ */
+static void
+rcu_start_gp(struct rcu_state *rsp, unsigned long flags)
+	__releases(rcu_get_root(rsp)->lock)
+{
+	struct rcu_data *rdp = rsp->rda[smp_processor_id()];
+	struct rcu_node *rnp = rcu_get_root(rsp);
+	struct rcu_node *rnp_cur;
+	struct rcu_node *rnp_end;
+
+	if (!cpu_needs_another_gp(rsp, rdp)) {
+		spin_unlock_irqrestore(&rnp->lock, flags);
+		return;
+	}
+
+	/* Advance to a new grace period and initialize state. */
+	rsp->gpnum++;
+	rsp->signaled = RCU_GP_INIT; /* Hold off force_quiescent_state. */
+	rsp->jiffies_force_qs = jiffies + RCU_JIFFIES_TILL_FORCE_QS;
+	rdp->n_rcu_pending_force_qs = rdp->n_rcu_pending +
+				      RCU_JIFFIES_TILL_FORCE_QS;
+	record_gp_stall_check_time(rsp);
+	dyntick_record_completed(rsp, rsp->completed - 1);
+	note_new_gpnum(rsp, rdp);
+
+	/*
+	 * Because we are first, we know that all our callbacks will
+	 * be covered by this upcoming grace period, even the ones
+	 * that were registered arbitrarily recently.
+	 */
+	rdp->nxttail[RCU_NEXT_READY_TAIL] = rdp->nxttail[RCU_NEXT_TAIL];
+	rdp->nxttail[RCU_WAIT_TAIL] = rdp->nxttail[RCU_NEXT_TAIL];
+
+	/* Special-case the common single-level case. */
+	if (NUM_RCU_NODES == 1) {
+		rnp->qsmask = rnp->qsmaskinit;
+		spin_unlock_irqrestore(&rnp->lock, flags);
+		return;
+	}
+
+	spin_unlock(&rnp->lock);  /* leave irqs disabled. */
+
+
+	/* Exclude any concurrent CPU-hotplug operations. */
+	spin_lock(&rsp->onofflock);  /* irqs already disabled. */
+
+	/*
+	 * Set the quiescent-state-needed bits in all the non-leaf RCU
+	 * nodes for all currently online CPUs.  This operation relies
+	 * on the layout of the hierarchy within the rsp->node[] array.
+	 * Note that other CPUs will access only the leaves of the
+	 * hierarchy, which still indicate that no grace period is in
+	 * progress.  In addition, we have excluded CPU-hotplug operations.
+	 *
+	 * We therefore do not need to hold any locks.  Any required
+	 * memory barriers will be supplied by the locks guarding the
+	 * leaf rcu_nodes in the hierarchy.
+	 */
+
+	rnp_end = rsp->level[NUM_RCU_LVLS - 1];
+	for (rnp_cur = &rsp->node[0]; rnp_cur < rnp_end; rnp_cur++)
+		rnp_cur->qsmask = rnp_cur->qsmaskinit;
+
+	/*
+	 * Now set up the leaf nodes.  Here we must be careful.  First,
+	 * we need to hold the lock in order to exclude other CPUs, which
+	 * might be contending for the leaf nodes' locks.  Second, as
+	 * soon as we initialize a given leaf node, its CPUs might run
+	 * up the rest of the hierarchy.  We must therefore acquire locks
+	 * for each node that we touch during this stage.  (But we still
+	 * are excluding CPU-hotplug operations.)
+	 *
+	 * Note that the grace period cannot complete until we finish
+	 * the initialization process, as there will be at least one
+	 * qsmask bit set in the root node until that time, namely the
+	 * one corresponding to this CPU.
+	 */
+	rnp_end = &rsp->node[NUM_RCU_NODES];
+	rnp_cur = rsp->level[NUM_RCU_LVLS - 1];
+	for (; rnp_cur < rnp_end; rnp_cur++) {
+		spin_lock(&rnp_cur->lock);	/* irqs already disabled. */
+		rnp_cur->qsmask = rnp_cur->qsmaskinit;
+		spin_unlock(&rnp_cur->lock);	/* irqs already disabled. */
+	}
+
+	rsp->signaled = RCU_SIGNAL_INIT; /* force_quiescent_state now OK. */
+	spin_unlock_irqrestore(&rsp->onofflock, flags);
+}
+
+/*
+ * Advance this CPU's callbacks, but only if the current grace period
+ * has ended.  This may be called only from the CPU to whom the rdp
+ * belongs.
+ */
+static void
+rcu_process_gp_end(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+	long completed_snap;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	completed_snap = ACCESS_ONCE(rsp->completed);  /* outside of lock. */
+
+	/* Did another grace period end? */
+	if (rdp->completed != completed_snap) {
+
+		/* Advance callbacks.  No harm if list empty. */
+		rdp->nxttail[RCU_DONE_TAIL] = rdp->nxttail[RCU_WAIT_TAIL];
+		rdp->nxttail[RCU_WAIT_TAIL] = rdp->nxttail[RCU_NEXT_READY_TAIL];
+		rdp->nxttail[RCU_NEXT_READY_TAIL] = rdp->nxttail[RCU_NEXT_TAIL];
+
+		/* Remember that we saw this grace-period completion. */
+		rdp->completed = completed_snap;
+	}
+	local_irq_restore(flags);
+}
+
+/*
+ * Similar to cpu_quiet(), for which it is a helper function.  Allows
+ * a group of CPUs to be quieted at one go, though all the CPUs in the
+ * group must be represented by the same leaf rcu_node structure.
+ * That structure's lock must be held upon entry, and it is released
+ * before return.
+ */
+static void
+cpu_quiet_msk(unsigned long mask, struct rcu_state *rsp, struct rcu_node *rnp,
+	      unsigned long flags)
+	__releases(rnp->lock)
+{
+	/* Walk up the rcu_node hierarchy. */
+	for (;;) {
+		if (!(rnp->qsmask & mask)) {
+
+			/* Our bit has already been cleared, so done. */
+			spin_unlock_irqrestore(&rnp->lock, flags);
+			return;
+		}
+		rnp->qsmask &= ~mask;
+		if (rnp->qsmask != 0) {
+
+			/* Other bits still set at this level, so done. */
+			spin_unlock_irqrestore(&rnp->lock, flags);
+			return;
+		}
+		mask = rnp->grpmask;
+		if (rnp->parent == NULL) {
+
+			/* No more levels.  Exit loop holding root lock. */
+
+			break;
+		}
+		spin_unlock_irqrestore(&rnp->lock, flags);
+		rnp = rnp->parent;
+		spin_lock_irqsave(&rnp->lock, flags);
+	}
+
+	/*
+	 * Get here if we are the last CPU to pass through a quiescent
+	 * state for this grace period.  Clean up and let rcu_start_gp()
+	 * start up the next grace period if one is needed.  Note that
+	 * we still hold rnp->lock, as required by rcu_start_gp(), which
+	 * will release it.
+	 */
+	rsp->completed = rsp->gpnum;
+	rcu_process_gp_end(rsp, rsp->rda[smp_processor_id()]);
+	rcu_start_gp(rsp, flags);  /* releases rnp->lock. */
+}
+
+/*
+ * Record a quiescent state for the specified CPU, which must either be
+ * the current CPU or an offline CPU.  The lastcomp argument is used to
+ * make sure we are still in the grace period of interest.  We don't want
+ * to end the current grace period based on quiescent states detected in
+ * an earlier grace period!
+ */
+static void
+cpu_quiet(int cpu, struct rcu_state *rsp, struct rcu_data *rdp, long lastcomp)
+{
+	unsigned long flags;
+	unsigned long mask;
+	struct rcu_node *rnp;
+
+	rnp = rdp->mynode;
+	spin_lock_irqsave(&rnp->lock, flags);
+	if (lastcomp != ACCESS_ONCE(rsp->completed)) {
+
+		/*
+		 * Someone beat us to it for this grace period, so leave.
+		 * The race with GP start is resolved by the fact that we
+		 * hold the leaf rcu_node lock, so that the per-CPU bits
+		 * cannot yet be initialized -- so we would simply find our
+		 * CPU's bit already cleared in cpu_quiet_msk() if this race
+		 * occurred.
+		 */
+		rdp->passed_quiesc = 0;	/* try again later! */
+		spin_unlock_irqrestore(&rnp->lock, flags);
+		return;
+	}
+	mask = rdp->grpmask;
+	if ((rnp->qsmask & mask) == 0) {
+		spin_unlock_irqrestore(&rnp->lock, flags);
+	} else {
+		rdp->qs_pending = 0;
+
+		/*
+		 * This GP can't end until cpu checks in, so all of our
+		 * callbacks can be processed during the next GP.
+		 */
+		rdp = rsp->rda[smp_processor_id()];
+		rdp->nxttail[RCU_NEXT_READY_TAIL] = rdp->nxttail[RCU_NEXT_TAIL];
+
+		cpu_quiet_msk(mask, rsp, rnp, flags); /* releases rnp->lock */
+	}
+}
+
+/*
+ * Check to see if there is a new grace period of which this CPU
+ * is not yet aware, and if so, set up local rcu_data state for it.
+ * Otherwise, see if this CPU has just passed through its first
+ * quiescent state for this grace period, and record that fact if so.
+ */
+static void
+rcu_check_quiescent_state(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+	/* If there is now a new grace period, record and return. */
+	if (check_for_new_grace_period(rsp, rdp))
+		return;
+
+	/*
+	 * Does this CPU still need to do its part for current grace period?
+	 * If no, return and let the other CPUs do their part as well.
+	 */
+	if (!rdp->qs_pending)
+		return;
+
+	/*
+	 * Was there a quiescent state since the beginning of the grace
+	 * period? If no, then exit and wait for the next call.
+	 */
+	if (!rdp->passed_quiesc)
+		return;
+
+	/* Tell RCU we are done (but cpu_quiet() will be the judge of that). */
+	cpu_quiet(rdp->cpu, rsp, rdp, rdp->passed_quiesc_completed);
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+
+/*
+ * Remove the outgoing CPU from the bitmasks in the rcu_node hierarchy
+ * and move all callbacks from the outgoing CPU to the current one.
+ */
+static void __rcu_offline_cpu(int cpu, struct rcu_state *rsp)
+{
+	int i;
+	unsigned long flags;
+	long lastcomp;
+	unsigned long mask;
+	struct rcu_data *rdp = rsp->rda[cpu];
+	struct rcu_data *rdp_me;
+	struct rcu_node *rnp;
+
+	/* Exclude any attempts to start a new grace period. */
+	spin_lock_irqsave(&rsp->onofflock, flags);
+
+	/* Remove the outgoing CPU from the masks in the rcu_node hierarchy. */
+	rnp = rdp->mynode;
+	mask = rdp->grpmask;	/* rnp->grplo is constant. */
+	do {
+		spin_lock(&rnp->lock);		/* irqs already disabled. */
+		rnp->qsmaskinit &= ~mask;
+		if (rnp->qsmaskinit != 0) {
+			spin_unlock(&rnp->lock); /* irqs already disabled. */
+			break;
+		}
+		mask = rnp->grpmask;
+		spin_unlock(&rnp->lock);	/* irqs already disabled. */
+		rnp = rnp->parent;
+	} while (rnp != NULL);
+	lastcomp = rsp->completed;
+
+	spin_unlock(&rsp->onofflock);		/* irqs remain disabled. */
+
+	/* Being offline is a quiescent state, so go record it. */
+	cpu_quiet(cpu, rsp, rdp, lastcomp);
+
+	/*
+	 * Move callbacks from the outgoing CPU to the running CPU.
+	 * Note that the outgoing CPU is now quiscent, so it is now
+	 * (uncharacteristically) safe to access it rcu_data structure.
+	 * Note also that we must carefully retain the order of the
+	 * outgoing CPU's callbacks in order for rcu_barrier() to work
+	 * correctly.  Finally, note that we start all the callbacks
+	 * afresh, even those that have passed through a grace period
+	 * and are therefore ready to invoke.  The theory is that hotplug
+	 * events are rare, and that if they are frequent enough to
+	 * indefinitely delay callbacks, you have far worse things to
+	 * be worrying about.
+	 */
+	rdp_me = rsp->rda[smp_processor_id()];
+	if (rdp->nxtlist != NULL) {
+		*rdp_me->nxttail[RCU_NEXT_TAIL] = rdp->nxtlist;
+		rdp_me->nxttail[RCU_NEXT_TAIL] = rdp->nxttail[RCU_NEXT_TAIL];
+		rdp->nxtlist = NULL;
+		for (i = 0; i < RCU_NEXT_SIZE; i++)
+			rdp->nxttail[i] = &rdp->nxtlist;
+		rdp_me->qlen += rdp->qlen;
+		rdp->qlen = 0;
+	}
+	local_irq_restore(flags);
+}
+
+/*
+ * Remove the specified CPU from the RCU hierarchy and move any pending
+ * callbacks that it might have to the current CPU.  This code assumes
+ * that at least one CPU in the system will remain running at all times.
+ * Any attempt to offline -all- CPUs is likely to strand RCU callbacks.
+ */
+static void rcu_offline_cpu(int cpu)
+{
+	__rcu_offline_cpu(cpu, &rcu_state);
+	__rcu_offline_cpu(cpu, &rcu_bh_state);
+}
+
+#else /* #ifdef CONFIG_HOTPLUG_CPU */
+
+static void rcu_offline_cpu(int cpu)
+{
+}
+
+#endif /* #else #ifdef CONFIG_HOTPLUG_CPU */
+
+/*
+ * Invoke any RCU callbacks that have made it to the end of their grace
+ * period.  Thottle as specified by rdp->blimit.
+ */
+static void rcu_do_batch(struct rcu_data *rdp)
+{
+	unsigned long flags;
+	struct rcu_head *next, *list, **tail;
+	int count;
+
+	/* If no callbacks are ready, just return.*/
+	if (!cpu_has_callbacks_ready_to_invoke(rdp))
+		return;
+
+	/*
+	 * Extract the list of ready callbacks, disabling to prevent
+	 * races with call_rcu() from interrupt handlers.
+	 */
+	local_irq_save(flags);
+	list = rdp->nxtlist;
+	rdp->nxtlist = *rdp->nxttail[RCU_DONE_TAIL];
+	*rdp->nxttail[RCU_DONE_TAIL] = NULL;
+	tail = rdp->nxttail[RCU_DONE_TAIL];
+	for (count = RCU_NEXT_SIZE - 1; count >= 0; count--)
+		if (rdp->nxttail[count] == rdp->nxttail[RCU_DONE_TAIL])
+			rdp->nxttail[count] = &rdp->nxtlist;
+	local_irq_restore(flags);
+
+	/* Invoke callbacks. */
+	count = 0;
+	while (list) {
+		next = list->next;
+		prefetch(next);
+		list->func(list);
+		list = next;
+		if (++count >= rdp->blimit)
+			break;
+	}
+
+	local_irq_save(flags);
+
+	/* Update count, and requeue any remaining callbacks. */
+	rdp->qlen -= count;
+	if (list != NULL) {
+		*tail = rdp->nxtlist;
+		rdp->nxtlist = list;
+		for (count = 0; count < RCU_NEXT_SIZE; count++)
+			if (&rdp->nxtlist == rdp->nxttail[count])
+				rdp->nxttail[count] = tail;
+			else
+				break;
+	}
+
+	/* Reinstate batch limit if we have worked down the excess. */
+	if (rdp->blimit == LONG_MAX && rdp->qlen <= qlowmark)
+		rdp->blimit = blimit;
+
+	local_irq_restore(flags);
+
+	/* Re-raise the RCU softirq if there are callbacks remaining. */
+	if (cpu_has_callbacks_ready_to_invoke(rdp))
+		raise_softirq(RCU_SOFTIRQ);
+}
+
+/*
+ * Check to see if this CPU is in a non-context-switch quiescent state
+ * (user mode or idle loop for rcu, non-softirq execution for rcu_bh).
+ * Also schedule the RCU softirq handler.
+ *
+ * This function must be called with hardirqs disabled.  It is normally
+ * invoked from the scheduling-clock interrupt.  If rcu_pending returns
+ * false, there is no point in invoking rcu_check_callbacks().
+ */
+void rcu_check_callbacks(int cpu, int user)
+{
+	if (user ||
+	    (idle_cpu(cpu) && !in_softirq() &&
+				hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
+
+		/*
+		 * Get here if this CPU took its interrupt from user
+		 * mode or from the idle loop, and if this is not a
+		 * nested interrupt.  In this case, the CPU is in
+		 * a quiescent state, so count it.
+		 *
+		 * No memory barrier is required here because both
+		 * rcu_qsctr_inc() and rcu_bh_qsctr_inc() reference
+		 * only CPU-local variables that other CPUs neither
+		 * access nor modify, at least not while the corresponding
+		 * CPU is online.
+		 */
+
+		rcu_qsctr_inc(cpu);
+		rcu_bh_qsctr_inc(cpu);
+
+	} else if (!in_softirq()) {
+
+		/*
+		 * Get here if this CPU did not take its interrupt from
+		 * softirq, in other words, if it is not interrupting
+		 * a rcu_bh read-side critical section.  This is an _bh
+		 * critical section, so count it.
+		 */
+
+		rcu_bh_qsctr_inc(cpu);
+	}
+	raise_softirq(RCU_SOFTIRQ);
+}
+
+#ifdef CONFIG_SMP
+
+/*
+ * Scan the leaf rcu_node structures, processing dyntick state for any that
+ * have not yet encountered a quiescent state, using the function specified.
+ * Returns 1 if the current grace period ends while scanning (possibly
+ * because we made it end).
+ */
+static int rcu_process_dyntick(struct rcu_state *rsp, long lastcomp,
+			       int (*f)(struct rcu_data *))
+{
+	unsigned long bit;
+	int cpu;
+	unsigned long flags;
+	unsigned long mask;
+	struct rcu_node *rnp_cur = rsp->level[NUM_RCU_LVLS - 1];
+	struct rcu_node *rnp_end = &rsp->node[NUM_RCU_NODES];
+
+	for (; rnp_cur < rnp_end; rnp_cur++) {
+		mask = 0;
+		spin_lock_irqsave(&rnp_cur->lock, flags);
+		if (rsp->completed != lastcomp) {
+			spin_unlock_irqrestore(&rnp_cur->lock, flags);
+			return 1;
+		}
+		if (rnp_cur->qsmask == 0) {
+			spin_unlock_irqrestore(&rnp_cur->lock, flags);
+			continue;
+		}
+		cpu = rnp_cur->grplo;
+		bit = 1;
+		for (; cpu <= rnp_cur->grphi; cpu++, bit <<= 1) {
+			if ((rnp_cur->qsmask & bit) != 0 && f(rsp->rda[cpu]))
+				mask |= bit;
+		}
+		if (mask != 0 && rsp->completed == lastcomp) {
+
+			/* cpu_quiet_msk() releases rnp_cur->lock. */
+			cpu_quiet_msk(mask, rsp, rnp_cur, flags);
+			continue;
+		}
+		spin_unlock_irqrestore(&rnp_cur->lock, flags);
+	}
+	return 0;
+}
+
+/*
+ * Force quiescent states on reluctant CPUs, and also detect which
+ * CPUs are in dyntick-idle mode.
+ */
+static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
+{
+	unsigned long flags;
+	long lastcomp;
+	struct rcu_data *rdp = rsp->rda[smp_processor_id()];
+	struct rcu_node *rnp = rcu_get_root(rsp);
+	u8 signaled;
+
+	if (ACCESS_ONCE(rsp->completed) == ACCESS_ONCE(rsp->gpnum))
+		return;  /* No grace period in progress, nothing to force. */
+	if (!spin_trylock_irqsave(&rsp->fqslock, flags)) {
+		rsp->n_force_qs_lh++; /* Inexact, can lose counts.  Tough! */
+		return;	/* Someone else is already on the job. */
+	}
+	if (relaxed &&
+	    (long)(rsp->jiffies_force_qs - jiffies) >= 0 &&
+	    (rdp->n_rcu_pending_force_qs - rdp->n_rcu_pending) >= 0)
+		goto unlock_ret; /* no emergency and done recently. */
+	rsp->n_force_qs++;
+	spin_lock(&rnp->lock);
+	lastcomp = rsp->completed;
+	signaled = rsp->signaled;
+	rsp->jiffies_force_qs = jiffies + RCU_JIFFIES_TILL_FORCE_QS;
+	rdp->n_rcu_pending_force_qs = rdp->n_rcu_pending +
+				      RCU_JIFFIES_TILL_FORCE_QS;
+	if (lastcomp == rsp->gpnum) {
+		rsp->n_force_qs_ngp++;
+		spin_unlock(&rnp->lock);
+		goto unlock_ret;  /* no GP in progress, time updated. */
+	}
+	spin_unlock(&rnp->lock);
+	switch (signaled) {
+	case RCU_GP_INIT:
+
+		break; /* grace period still initializing, ignore. */
+
+	case RCU_SAVE_DYNTICK:
+
+		if (RCU_SIGNAL_INIT != RCU_SAVE_DYNTICK)
+			break; /* So gcc recognizes the dead code. */
+
+		/* Record dyntick-idle state. */
+		if (rcu_process_dyntick(rsp, lastcomp,
+					dyntick_save_progress_counter))
+			goto unlock_ret;
+
+		/* Update state, record completion counter. */
+		spin_lock(&rnp->lock);
+		if (lastcomp == rsp->completed) {
+			rsp->signaled = RCU_FORCE_QS;
+			dyntick_record_completed(rsp, lastcomp);
+		}
+		spin_unlock(&rnp->lock);
+		break;
+
+	case RCU_FORCE_QS:
+
+		/* Check dyntick-idle state, send IPI to laggarts. */
+		if (rcu_process_dyntick(rsp, dyntick_recall_completed(rsp),
+					rcu_implicit_dynticks_qs))
+			goto unlock_ret;
+
+		/* Leave state in case more forcing is required. */
+
+		break;
+	}
+unlock_ret:
+	spin_unlock_irqrestore(&rsp->fqslock, flags);
+}
+
+#else /* #ifdef CONFIG_SMP */
+
+static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
+{
+	set_need_resched();
+}
+
+#endif /* #else #ifdef CONFIG_SMP */
+
+/*
+ * This does the RCU processing work from softirq context for the
+ * specified rcu_state and rcu_data structures.  This may be called
+ * only from the CPU to whom the rdp belongs.
+ */
+static void
+__rcu_process_callbacks(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+	unsigned long flags;
+
+	/*
+	 * If an RCU GP has gone long enough, go check for dyntick
+	 * idle CPUs and, if needed, send resched IPIs.
+	 */
+	if ((long)(ACCESS_ONCE(rsp->jiffies_force_qs) - jiffies) < 0 ||
+	    (rdp->n_rcu_pending_force_qs - rdp->n_rcu_pending) < 0)
+		force_quiescent_state(rsp, 1);
+
+	/*
+	 * Advance callbacks in response to end of earlier grace
+	 * period that some other CPU ended.
+	 */
+	rcu_process_gp_end(rsp, rdp);
+
+	/* Update RCU state based on any recent quiescent states. */
+	rcu_check_quiescent_state(rsp, rdp);
+
+	/* Does this CPU require a not-yet-started grace period? */
+	if (cpu_needs_another_gp(rsp, rdp)) {
+		spin_lock_irqsave(&rcu_get_root(rsp)->lock, flags);
+		rcu_start_gp(rsp, flags);  /* releases above lock */
+	}
+
+	/* If there are callbacks ready, invoke them. */
+	rcu_do_batch(rdp);
+}
+
+/*
+ * Do softirq processing for the current CPU.
+ */
+static void rcu_process_callbacks(struct softirq_action *unused)
+{
+	/*
+	 * Memory references from any prior RCU read-side critical sections
+	 * executed by the interrupted code must be seen before any RCU
+	 * grace-period manipulations below.
+	 */
+	smp_mb(); /* See above block comment. */
+
+	__rcu_process_callbacks(&rcu_state, &__get_cpu_var(rcu_data));
+	__rcu_process_callbacks(&rcu_bh_state, &__get_cpu_var(rcu_bh_data));
+
+	/*
+	 * Memory references from any later RCU read-side critical sections
+	 * executed by the interrupted code must be seen after any RCU
+	 * grace-period manipulations above.
+	 */
+	smp_mb(); /* See above block comment. */
+}
+
+static void
+__call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu),
+	   struct rcu_state *rsp)
+{
+	unsigned long flags;
+	struct rcu_data *rdp;
+
+	head->func = func;
+	head->next = NULL;
+
+	smp_mb(); /* Ensure RCU update seen before callback registry. */
+
+	/*
+	 * Opportunistically note grace-period endings and beginnings.
+	 * Note that we might see a beginning right after we see an
+	 * end, but never vice versa, since this CPU has to pass through
+	 * a quiescent state betweentimes.
+	 */
+	local_irq_save(flags);
+	rdp = rsp->rda[smp_processor_id()];
+	rcu_process_gp_end(rsp, rdp);
+	check_for_new_grace_period(rsp, rdp);
+
+	/* Add the callback to our list. */
+	*rdp->nxttail[RCU_NEXT_TAIL] = head;
+	rdp->nxttail[RCU_NEXT_TAIL] = &head->next;
+
+	/* Start a new grace period if one not already started. */
+	if (ACCESS_ONCE(rsp->completed) == ACCESS_ONCE(rsp->gpnum)) {
+		unsigned long nestflag;
+		struct rcu_node *rnp_root = rcu_get_root(rsp);
+
+		spin_lock_irqsave(&rnp_root->lock, nestflag);
+		rcu_start_gp(rsp, nestflag);  /* releases rnp_root->lock. */
+	}
+
+	/* Force the grace period if too many callbacks or too long waiting. */
+	if (unlikely(++rdp->qlen > qhimark)) {
+		rdp->blimit = LONG_MAX;
+		force_quiescent_state(rsp, 0);
+	} else if ((long)(ACCESS_ONCE(rsp->jiffies_force_qs) - jiffies) < 0 ||
+		   (rdp->n_rcu_pending_force_qs - rdp->n_rcu_pending) < 0)
+		force_quiescent_state(rsp, 1);
+	local_irq_restore(flags);
+}
+
+/*
+ * Queue an RCU callback for invocation after a grace period.
+ */
+void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
+{
+	__call_rcu(head, func, &rcu_state);
+}
+EXPORT_SYMBOL_GPL(call_rcu);
+
+/*
+ * Queue an RCU for invocation after a quicker grace period.
+ */
+void call_rcu_bh(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
+{
+	__call_rcu(head, func, &rcu_bh_state);
+}
+EXPORT_SYMBOL_GPL(call_rcu_bh);
+
+/*
+ * Check to see if there is any immediate RCU-related work to be done
+ * by the current CPU, for the specified type of RCU, returning 1 if so.
+ * The checks are in order of increasing expense: checks that can be
+ * carried out against CPU-local state are performed first.  However,
+ * we must check for CPU stalls first, else we might not get a chance.
+ */
+static int __rcu_pending(struct rcu_state *rsp, struct rcu_data *rdp)
+{
+	rdp->n_rcu_pending++;
+
+	/* Check for CPU stalls, if enabled. */
+	check_cpu_stall(rsp, rdp);
+
+	/* Is the RCU core waiting for a quiescent state from this CPU? */
+	if (rdp->qs_pending)
+		return 1;
+
+	/* Does this CPU have callbacks ready to invoke? */
+	if (cpu_has_callbacks_ready_to_invoke(rdp))
+		return 1;
+
+	/* Has RCU gone idle with this CPU needing another grace period? */
+	if (cpu_needs_another_gp(rsp, rdp))
+		return 1;
+
+	/* Has another RCU grace period completed?  */
+	if (ACCESS_ONCE(rsp->completed) != rdp->completed) /* outside of lock */
+		return 1;
+
+	/* Has a new RCU grace period started? */
+	if (ACCESS_ONCE(rsp->gpnum) != rdp->gpnum) /* outside of lock */
+		return 1;
+
+	/* Has an RCU GP gone long enough to send resched IPIs &c? */
+	if (ACCESS_ONCE(rsp->completed) != ACCESS_ONCE(rsp->gpnum) &&
+	    ((long)(ACCESS_ONCE(rsp->jiffies_force_qs) - jiffies) < 0 ||
+	     (rdp->n_rcu_pending_force_qs - rdp->n_rcu_pending) < 0))
+		return 1;
+
+	/* nothing to do */
+	return 0;
+}
+
+/*
+ * Check to see if there is any immediate RCU-related work to be done
+ * by the current CPU, returning 1 if so.  This function is part of the
+ * RCU implementation; it is -not- an exported member of the RCU API.
+ */
+int rcu_pending(int cpu)
+{
+	return __rcu_pending(&rcu_state, &per_cpu(rcu_data, cpu)) ||
+	       __rcu_pending(&rcu_bh_state, &per_cpu(rcu_bh_data, cpu));
+}
+
+/*
+ * Check to see if any future RCU-related work will need to be done
+ * by the current CPU, even if none need be done immediately, returning
+ * 1 if so.  This function is part of the RCU implementation; it is -not-
+ * an exported member of the RCU API.
+ */
+int rcu_needs_cpu(int cpu)
+{
+	/* RCU callbacks either ready or pending? */
+	return per_cpu(rcu_data, cpu).nxtlist ||
+	       per_cpu(rcu_bh_data, cpu).nxtlist;
+}
+
+/*
+ * Initialize a CPU's per-CPU RCU data.  We take this "scorched earth"
+ * approach so that we don't have to worry about how long the CPU has
+ * been gone, or whether it ever was online previously.  We do trust the
+ * ->mynode field, as it is constant for a given struct rcu_data and
+ * initialized during early boot.
+ *
+ * Note that only one online or offline event can be happening at a given
+ * time.  Note also that we can accept some slop in the rsp->completed
+ * access due to the fact that this CPU cannot possibly have any RCU
+ * callbacks in flight yet.
+ */
+static void
+rcu_init_percpu_data(int cpu, struct rcu_state *rsp)
+{
+	unsigned long flags;
+	int i;
+	long lastcomp;
+	unsigned long mask;
+	struct rcu_data *rdp = rsp->rda[cpu];
+	struct rcu_node *rnp = rcu_get_root(rsp);
+
+	/* Set up local state, ensuring consistent view of global state. */
+	spin_lock_irqsave(&rnp->lock, flags);
+	lastcomp = rsp->completed;
+	rdp->completed = lastcomp;
+	rdp->gpnum = lastcomp;
+	rdp->passed_quiesc = 0;  /* We could be racing with new GP, */
+	rdp->qs_pending = 1;	 /*  so set up to respond to current GP. */
+	rdp->beenonline = 1;	 /* We have now been online. */
+	rdp->passed_quiesc_completed = lastcomp - 1;
+	rdp->grpmask = 1UL << (cpu - rdp->mynode->grplo);
+	rdp->nxtlist = NULL;
+	for (i = 0; i < RCU_NEXT_SIZE; i++)
+		rdp->nxttail[i] = &rdp->nxtlist;
+	rdp->qlen = 0;
+	rdp->blimit = blimit;
+#ifdef CONFIG_NO_HZ
+	rdp->dynticks = &per_cpu(rcu_dynticks, cpu);
+#endif /* #ifdef CONFIG_NO_HZ */
+	rdp->cpu = cpu;
+	spin_unlock(&rnp->lock);		/* irqs remain disabled. */
+
+	/*
+	 * A new grace period might start here.  If so, we won't be part
+	 * of it, but that is OK, as we are currently in a quiescent state.
+	 */
+
+	/* Exclude any attempts to start a new GP on large systems. */
+	spin_lock(&rsp->onofflock);		/* irqs already disabled. */
+
+	/* Add CPU to rcu_node bitmasks. */
+	rnp = rdp->mynode;
+	mask = rdp->grpmask;
+	do {
+		/* Exclude any attempts to start a new GP on small systems. */
+		spin_lock(&rnp->lock);	/* irqs already disabled. */
+		rnp->qsmaskinit |= mask;
+		mask = rnp->grpmask;
+		spin_unlock(&rnp->lock); /* irqs already disabled. */
+		rnp = rnp->parent;
+	} while (rnp != NULL && !(rnp->qsmaskinit & mask));
+
+	spin_unlock(&rsp->onofflock);		/* irqs remain disabled. */
+
+	/*
+	 * A new grace period might start here.  If so, we will be part of
+	 * it, and its gpnum will be greater than ours, so we will
+	 * participate.  It is also possible for the gpnum to have been
+	 * incremented before this function was called, and the bitmasks
+	 * to not be filled out until now, in which case we will also
+	 * participate due to our gpnum being behind.
+	 */
+
+	/* Since it is coming online, the CPU is in a quiescent state. */
+	cpu_quiet(cpu, rsp, rdp, lastcomp);
+	local_irq_restore(flags);
+}
+
+static void __cpuinit rcu_online_cpu(int cpu)
+{
+#ifdef CONFIG_NO_HZ
+	struct rcu_dynticks *rdtp = &per_cpu(rcu_dynticks, cpu);
+
+	rdtp->dynticks_nesting = 1;
+	rdtp->dynticks |= 1; 	/* need consecutive #s even for hotplug. */
+	rdtp->dynticks_nmi = (rdtp->dynticks_nmi + 1) & ~0x1;
+#endif /* #ifdef CONFIG_NO_HZ */
+	rcu_init_percpu_data(cpu, &rcu_state);
+	rcu_init_percpu_data(cpu, &rcu_bh_state);
+	open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
+}
+
+/*
+ * Handle CPU online/offline notifcation events.
+ */
+static int __cpuinit rcu_cpu_notify(struct notifier_block *self,
+				unsigned long action, void *hcpu)
+{
+	long cpu = (long)hcpu;
+
+	switch (action) {
+	case CPU_UP_PREPARE:
+	case CPU_UP_PREPARE_FROZEN:
+		rcu_online_cpu(cpu);
+		break;
+	case CPU_DEAD:
+	case CPU_DEAD_FROZEN:
+	case CPU_UP_CANCELED:
+	case CPU_UP_CANCELED_FROZEN:
+		rcu_offline_cpu(cpu);
+		break;
+	default:
+		break;
+	}
+	return NOTIFY_OK;
+}
+
+/*
+ * Compute the per-level fanout, either using the exact fanout specified
+ * or balancing the tree, depending on CONFIG_RCU_FANOUT_EXACT.
+ */
+#ifdef CONFIG_RCU_FANOUT_EXACT
+static void __init rcu_init_levelspread(struct rcu_state *rsp)
+{
+	int i;
+
+	for (i = NUM_RCU_LVLS - 1; i >= 0; i--)
+		rsp->levelspread[i] = CONFIG_RCU_FANOUT;
+}
+#else /* #ifdef CONFIG_RCU_FANOUT_EXACT */
+static void __init rcu_init_levelspread(struct rcu_state *rsp)
+{
+	int ccur;
+	int cprv;
+	int i;
+
+	cprv = NR_CPUS;
+	for (i = NUM_RCU_LVLS - 1; i >= 0; i--) {
+		ccur = rsp->levelcnt[i];
+		rsp->levelspread[i] = (cprv + ccur - 1) / ccur;
+		cprv = ccur;
+	}
+}
+#endif /* #else #ifdef CONFIG_RCU_FANOUT_EXACT */
+
+/*
+ * Helper function for rcu_init() that initializes one rcu_state structure.
+ */
+static void __init rcu_init_one(struct rcu_state *rsp)
+{
+	int cpustride = 1;
+	int i;
+	int j;
+	struct rcu_node *rnp;
+
+	/* Initialize the level-tracking arrays. */
+
+	for (i = 1; i < NUM_RCU_LVLS; i++)
+		rsp->level[i] = rsp->level[i - 1] + rsp->levelcnt[i - 1];
+	rcu_init_levelspread(rsp);
+
+	/* Initialize the elements themselves, starting from the leaves. */
+
+	for (i = NUM_RCU_LVLS - 1; i >= 0; i--) {
+		cpustride *= rsp->levelspread[i];
+		rnp = rsp->level[i];
+		for (j = 0; j < rsp->levelcnt[i]; j++, rnp++) {
+			spin_lock_init(&rnp->lock);
+			rnp->qsmask = 0;
+			rnp->qsmaskinit = 0;
+			rnp->grplo = j * cpustride;
+			rnp->grphi = (j + 1) * cpustride - 1;
+			if (rnp->grphi >= NR_CPUS)
+				rnp->grphi = NR_CPUS - 1;
+			if (i == 0) {
+				rnp->grpnum = 0;
+				rnp->grpmask = 0;
+				rnp->parent = NULL;
+			} else {
+				rnp->grpnum = j % rsp->levelspread[i - 1];
+				rnp->grpmask = 1UL << rnp->grpnum;
+				rnp->parent = rsp->level[i - 1] +
+					      j / rsp->levelspread[i - 1];
+			}
+			rnp->level = i;
+		}
+	}
+}
+
+/*
+ * Helper macro for __rcu_init().  To be used nowhere else!
+ * Assigns leaf node pointers into each CPU's rcu_data structure.
+ */
+#define RCU_DATA_PTR_INIT(rsp, rcu_data) \
+do { \
+	rnp = (rsp)->level[NUM_RCU_LVLS - 1]; \
+	j = 0; \
+	for_each_possible_cpu(i) { \
+		if (i > rnp[j].grphi) \
+			j++; \
+		per_cpu(rcu_data, i).mynode = &rnp[j]; \
+		(rsp)->rda[i] = &per_cpu(rcu_data, i); \
+	} \
+} while (0)
+
+static struct notifier_block __cpuinitdata rcu_nb = {
+	.notifier_call	= rcu_cpu_notify,
+};
+
+void __init __rcu_init(void)
+{
+	int i;			/* All used by RCU_DATA_PTR_INIT(). */
+	int j;
+	struct rcu_node *rnp;
+
+	printk(KERN_WARNING "Experimental hierarchical RCU implementation.\n");
+#ifdef CONFIG_RCU_CPU_STALL_DETECTOR
+	printk(KERN_INFO "RCU-based detection of stalled CPUs is enabled.\n");
+#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
+	rcu_init_one(&rcu_state);
+	RCU_DATA_PTR_INIT(&rcu_state, rcu_data);
+	rcu_init_one(&rcu_bh_state);
+	RCU_DATA_PTR_INIT(&rcu_bh_state, rcu_bh_data);
+
+	for_each_online_cpu(i)
+		rcu_cpu_notify(&rcu_nb, CPU_UP_PREPARE, (void *)(long)i);
+	/* Register notifier for non-boot CPUs */
+	register_cpu_notifier(&rcu_nb);
+	printk(KERN_WARNING "Experimental hierarchical RCU init done.\n");
+}
+
+module_param(blimit, int, 0);
+module_param(qhimark, int, 0);
+module_param(qlowmark, int, 0);
diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
new file mode 100644
index 000000000000..d6db3e837826
--- /dev/null
+++ b/kernel/rcutree_trace.c
@@ -0,0 +1,271 @@
+/*
+ * Read-Copy Update tracing for classic implementation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright IBM Corporation, 2008
+ *
+ * Papers:  http://www.rdrop.com/users/paulmck/RCU
+ *
+ * For detailed explanation of Read-Copy Update mechanism see -
+ * 		Documentation/RCU
+ *
+ */
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/smp.h>
+#include <linux/rcupdate.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <asm/atomic.h>
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include <linux/completion.h>
+#include <linux/moduleparam.h>
+#include <linux/percpu.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
+#include <linux/mutex.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
+{
+	if (!rdp->beenonline)
+		return;
+	seq_printf(m, "%3d%cc=%ld g=%ld pq=%d pqc=%ld qp=%d rpfq=%ld rp=%x",
+		   rdp->cpu,
+		   cpu_is_offline(rdp->cpu) ? '!' : ' ',
+		   rdp->completed, rdp->gpnum,
+		   rdp->passed_quiesc, rdp->passed_quiesc_completed,
+		   rdp->qs_pending,
+		   rdp->n_rcu_pending_force_qs - rdp->n_rcu_pending,
+		   (int)(rdp->n_rcu_pending & 0xffff));
+#ifdef CONFIG_NO_HZ
+	seq_printf(m, " dt=%d/%d dn=%d df=%lu",
+		   rdp->dynticks->dynticks,
+		   rdp->dynticks->dynticks_nesting,
+		   rdp->dynticks->dynticks_nmi,
+		   rdp->dynticks_fqs);
+#endif /* #ifdef CONFIG_NO_HZ */
+	seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi);
+	seq_printf(m, " ql=%ld b=%ld\n", rdp->qlen, rdp->blimit);
+}
+
+#define PRINT_RCU_DATA(name, func, m) \
+	do { \
+		int _p_r_d_i; \
+		\
+		for_each_possible_cpu(_p_r_d_i) \
+			func(m, &per_cpu(name, _p_r_d_i)); \
+	} while (0)
+
+static int show_rcudata(struct seq_file *m, void *unused)
+{
+	seq_puts(m, "rcu:\n");
+	PRINT_RCU_DATA(rcu_data, print_one_rcu_data, m);
+	seq_puts(m, "rcu_bh:\n");
+	PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m);
+	return 0;
+}
+
+static int rcudata_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, show_rcudata, NULL);
+}
+
+static struct file_operations rcudata_fops = {
+	.owner = THIS_MODULE,
+	.open = rcudata_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
+{
+	if (!rdp->beenonline)
+		return;
+	seq_printf(m, "%d,%s,%ld,%ld,%d,%ld,%d,%ld,%ld",
+		   rdp->cpu,
+		   cpu_is_offline(rdp->cpu) ? "\"Y\"" : "\"N\"",
+		   rdp->completed, rdp->gpnum,
+		   rdp->passed_quiesc, rdp->passed_quiesc_completed,
+		   rdp->qs_pending,
+		   rdp->n_rcu_pending_force_qs - rdp->n_rcu_pending,
+		   rdp->n_rcu_pending);
+#ifdef CONFIG_NO_HZ
+	seq_printf(m, ",%d,%d,%d,%lu",
+		   rdp->dynticks->dynticks,
+		   rdp->dynticks->dynticks_nesting,
+		   rdp->dynticks->dynticks_nmi,
+		   rdp->dynticks_fqs);
+#endif /* #ifdef CONFIG_NO_HZ */
+	seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi);
+	seq_printf(m, ",%ld,%ld\n", rdp->qlen, rdp->blimit);
+}
+
+static int show_rcudata_csv(struct seq_file *m, void *unused)
+{
+	seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\",\"rpfq\",\"rp\",");
+#ifdef CONFIG_NO_HZ
+	seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\",");
+#endif /* #ifdef CONFIG_NO_HZ */
+	seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\"\n");
+	seq_puts(m, "\"rcu:\"\n");
+	PRINT_RCU_DATA(rcu_data, print_one_rcu_data_csv, m);
+	seq_puts(m, "\"rcu_bh:\"\n");
+	PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m);
+	return 0;
+}
+
+static int rcudata_csv_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, show_rcudata_csv, NULL);
+}
+
+static struct file_operations rcudata_csv_fops = {
+	.owner = THIS_MODULE,
+	.open = rcudata_csv_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
+{
+	int level = 0;
+	struct rcu_node *rnp;
+
+	seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x "
+	              "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n",
+		   rsp->completed, rsp->gpnum, rsp->signaled,
+		   (long)(rsp->jiffies_force_qs - jiffies),
+		   (int)(jiffies & 0xffff),
+		   rsp->n_force_qs, rsp->n_force_qs_ngp,
+		   rsp->n_force_qs - rsp->n_force_qs_ngp,
+		   rsp->n_force_qs_lh);
+	for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) {
+		if (rnp->level != level) {
+			seq_puts(m, "\n");
+			level = rnp->level;
+		}
+		seq_printf(m, "%lx/%lx %d:%d ^%d    ",
+			   rnp->qsmask, rnp->qsmaskinit,
+			   rnp->grplo, rnp->grphi, rnp->grpnum);
+	}
+	seq_puts(m, "\n");
+}
+
+static int show_rcuhier(struct seq_file *m, void *unused)
+{
+	seq_puts(m, "rcu:\n");
+	print_one_rcu_state(m, &rcu_state);
+	seq_puts(m, "rcu_bh:\n");
+	print_one_rcu_state(m, &rcu_bh_state);
+	return 0;
+}
+
+static int rcuhier_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, show_rcuhier, NULL);
+}
+
+static struct file_operations rcuhier_fops = {
+	.owner = THIS_MODULE,
+	.open = rcuhier_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static int show_rcugp(struct seq_file *m, void *unused)
+{
+	seq_printf(m, "rcu: completed=%ld  gpnum=%ld\n",
+		   rcu_state.completed, rcu_state.gpnum);
+	seq_printf(m, "rcu_bh: completed=%ld  gpnum=%ld\n",
+		   rcu_bh_state.completed, rcu_bh_state.gpnum);
+	return 0;
+}
+
+static int rcugp_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, show_rcugp, NULL);
+}
+
+static struct file_operations rcugp_fops = {
+	.owner = THIS_MODULE,
+	.open = rcugp_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static struct dentry *rcudir, *datadir, *datadir_csv, *hierdir, *gpdir;
+static int __init rcuclassic_trace_init(void)
+{
+	rcudir = debugfs_create_dir("rcu", NULL);
+	if (!rcudir)
+		goto out;
+
+	datadir = debugfs_create_file("rcudata", 0444, rcudir,
+						NULL, &rcudata_fops);
+	if (!datadir)
+		goto free_out;
+
+	datadir_csv = debugfs_create_file("rcudata.csv", 0444, rcudir,
+						NULL, &rcudata_csv_fops);
+	if (!datadir_csv)
+		goto free_out;
+
+	gpdir = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
+	if (!gpdir)
+		goto free_out;
+
+	hierdir = debugfs_create_file("rcuhier", 0444, rcudir,
+						NULL, &rcuhier_fops);
+	if (!hierdir)
+		goto free_out;
+	return 0;
+free_out:
+	if (datadir)
+		debugfs_remove(datadir);
+	if (datadir_csv)
+		debugfs_remove(datadir_csv);
+	if (gpdir)
+		debugfs_remove(gpdir);
+	debugfs_remove(rcudir);
+out:
+	return 1;
+}
+
+static void __exit rcuclassic_trace_cleanup(void)
+{
+	debugfs_remove(datadir);
+	debugfs_remove(datadir_csv);
+	debugfs_remove(gpdir);
+	debugfs_remove(hierdir);
+	debugfs_remove(rcudir);
+}
+
+
+module_init(rcuclassic_trace_init);
+module_exit(rcuclassic_trace_cleanup);
+
+MODULE_AUTHOR("Paul E. McKenney");
+MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
+MODULE_LICENSE("GPL");
diff --git a/kernel/relay.c b/kernel/relay.c
index 8d13a7855c08..09ac2008f77b 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -400,7 +400,7 @@ void relay_reset(struct rchan *chan)
 	}
 
 	mutex_lock(&relay_channels_mutex);
-	for_each_online_cpu(i)
+	for_each_possible_cpu(i)
 		if (chan->buf[i])
 			__relay_reset(chan->buf[i], 0);
 	mutex_unlock(&relay_channels_mutex);
@@ -611,10 +611,9 @@ struct rchan *relay_open(const char *base_filename,
 	return chan;
 
 free_bufs:
-	for_each_online_cpu(i) {
-		if (!chan->buf[i])
-			break;
-		relay_close_buf(chan->buf[i]);
+	for_each_possible_cpu(i) {
+		if (chan->buf[i])
+			relay_close_buf(chan->buf[i]);
 	}
 
 	kref_put(&chan->kref, relay_destroy_channel);
@@ -1318,12 +1317,9 @@ static ssize_t relay_file_splice_read(struct file *in,
 		if (ret < 0)
 			break;
 		else if (!ret) {
-			if (spliced)
-				break;
-			if (flags & SPLICE_F_NONBLOCK) {
+			if (flags & SPLICE_F_NONBLOCK)
 				ret = -EAGAIN;
-				break;
-			}
+			break;
 		}
 
 		*ppos += ret;
diff --git a/kernel/resource.c b/kernel/resource.c
index 414d6fc9131e..e633106b12f6 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -17,6 +17,7 @@
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/device.h>
+#include <linux/pfn.h>
 #include <asm/io.h>
 
 
@@ -38,10 +39,6 @@ EXPORT_SYMBOL(iomem_resource);
 
 static DEFINE_RWLOCK(resource_lock);
 
-#ifdef CONFIG_PROC_FS
-
-enum { MAX_IORES_LEVEL = 5 };
-
 static void *r_next(struct seq_file *m, void *v, loff_t *pos)
 {
 	struct resource *p = v;
@@ -53,6 +50,10 @@ static void *r_next(struct seq_file *m, void *v, loff_t *pos)
 	return p->sibling;
 }
 
+#ifdef CONFIG_PROC_FS
+
+enum { MAX_IORES_LEVEL = 5 };
+
 static void *r_start(struct seq_file *m, loff_t *pos)
 	__acquires(resource_lock)
 {
@@ -522,7 +523,7 @@ static void __init __reserve_region_with_split(struct resource *root,
 {
 	struct resource *parent = root;
 	struct resource *conflict;
-	struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
+	struct resource *res = kzalloc(sizeof(*res), GFP_ATOMIC);
 
 	if (!res)
 		return;
@@ -549,13 +550,9 @@ static void __init __reserve_region_with_split(struct resource *root,
 	}
 
 	if (!res) {
-		printk(KERN_DEBUG "    __reserve_region_with_split: (%s) [%llx, %llx], res: (%s) [%llx, %llx]\n",
-			 conflict->name, conflict->start, conflict->end,
-			 name, start, end);
-
 		/* failed, split and try again */
 
-		/* conflict coverred whole area */
+		/* conflict covered whole area */
 		if (conflict->start <= start && conflict->end >= end)
 			return;
 
@@ -575,7 +572,7 @@ static void __init __reserve_region_with_split(struct resource *root,
 
 }
 
-void reserve_region_with_split(struct resource *root,
+void __init reserve_region_with_split(struct resource *root,
 		resource_size_t start, resource_size_t end,
 		const char *name)
 {
@@ -630,33 +627,34 @@ struct resource * __request_region(struct resource *parent,
 {
 	struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
 
-	if (res) {
-		res->name = name;
-		res->start = start;
-		res->end = start + n - 1;
-		res->flags = IORESOURCE_BUSY;
+	if (!res)
+		return NULL;
 
-		write_lock(&resource_lock);
+	res->name = name;
+	res->start = start;
+	res->end = start + n - 1;
+	res->flags = IORESOURCE_BUSY;
 
-		for (;;) {
-			struct resource *conflict;
+	write_lock(&resource_lock);
 
-			conflict = __request_resource(parent, res);
-			if (!conflict)
-				break;
-			if (conflict != parent) {
-				parent = conflict;
-				if (!(conflict->flags & IORESOURCE_BUSY))
-					continue;
-			}
+	for (;;) {
+		struct resource *conflict;
 
-			/* Uhhuh, that didn't work out.. */
-			kfree(res);
-			res = NULL;
+		conflict = __request_resource(parent, res);
+		if (!conflict)
 			break;
+		if (conflict != parent) {
+			parent = conflict;
+			if (!(conflict->flags & IORESOURCE_BUSY))
+				continue;
 		}
-		write_unlock(&resource_lock);
+
+		/* Uhhuh, that didn't work out.. */
+		kfree(res);
+		res = NULL;
+		break;
 	}
+	write_unlock(&resource_lock);
 	return res;
 }
 EXPORT_SYMBOL(__request_region);
@@ -831,3 +829,50 @@ static int __init reserve_setup(char *str)
 }
 
 __setup("reserve=", reserve_setup);
+
+/*
+ * Check if the requested addr and size spans more than any slot in the
+ * iomem resource tree.
+ */
+int iomem_map_sanity_check(resource_size_t addr, unsigned long size)
+{
+	struct resource *p = &iomem_resource;
+	int err = 0;
+	loff_t l;
+
+	read_lock(&resource_lock);
+	for (p = p->child; p ; p = r_next(NULL, p, &l)) {
+		/*
+		 * We can probably skip the resources without
+		 * IORESOURCE_IO attribute?
+		 */
+		if (p->start >= addr + size)
+			continue;
+		if (p->end < addr)
+			continue;
+		if (PFN_DOWN(p->start) <= PFN_DOWN(addr) &&
+		    PFN_DOWN(p->end) >= PFN_DOWN(addr + size - 1))
+			continue;
+		/*
+		 * if a resource is "BUSY", it's not a hardware resource
+		 * but a driver mapping of such a resource; we don't want
+		 * to warn for those; some drivers legitimately map only
+		 * partial hardware resources. (example: vesafb)
+		 */
+		if (p->flags & IORESOURCE_BUSY)
+			continue;
+
+		printk(KERN_WARNING "resource map sanity check conflict: "
+		       "0x%llx 0x%llx 0x%llx 0x%llx %s\n",
+		       (unsigned long long)addr,
+		       (unsigned long long)(addr + size - 1),
+		       (unsigned long long)p->start,
+		       (unsigned long long)p->end,
+		       p->name);
+		err = -1;
+		break;
+	}
+	read_unlock(&resource_lock);
+
+	return err;
+}
diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index 6522ae5b14a2..69d9cb921ffa 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -631,8 +631,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
 
 	/* Setup the timer, when timeout != NULL */
 	if (unlikely(timeout)) {
-		hrtimer_start(&timeout->timer, timeout->timer.expires,
-			      HRTIMER_MODE_ABS);
+		hrtimer_start_expires(&timeout->timer, HRTIMER_MODE_ABS);
 		if (!hrtimer_active(&timeout->timer))
 			timeout->task = NULL;
 	}
diff --git a/kernel/sched.c b/kernel/sched.c
index d897a524e7d8..c731dd820d1a 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -55,6 +55,7 @@
 #include <linux/cpuset.h>
 #include <linux/percpu.h>
 #include <linux/kthread.h>
+#include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/sysctl.h>
 #include <linux/syscalls.h>
@@ -71,6 +72,7 @@
 #include <linux/debugfs.h>
 #include <linux/ctype.h>
 #include <linux/ftrace.h>
+#include <trace/sched.h>
 
 #include <asm/tlb.h>
 #include <asm/irq_regs.h>
@@ -116,6 +118,12 @@
  */
 #define RUNTIME_INF	((u64)~0ULL)
 
+DEFINE_TRACE(sched_wait_task);
+DEFINE_TRACE(sched_wakeup);
+DEFINE_TRACE(sched_wakeup_new);
+DEFINE_TRACE(sched_switch);
+DEFINE_TRACE(sched_migrate_task);
+
 #ifdef CONFIG_SMP
 /*
  * Divide a load by a sched group cpu_power : (load / sg->__cpu_power)
@@ -201,7 +209,6 @@ void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime)
 	hrtimer_init(&rt_b->rt_period_timer,
 			CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	rt_b->rt_period_timer.function = sched_rt_period_timer;
-	rt_b->rt_period_timer.cb_mode = HRTIMER_CB_IRQSAFE_UNLOCKED;
 }
 
 static inline int rt_bandwidth_enabled(void)
@@ -226,9 +233,8 @@ static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
 
 		now = hrtimer_cb_get_time(&rt_b->rt_period_timer);
 		hrtimer_forward(&rt_b->rt_period_timer, now, rt_b->rt_period);
-		hrtimer_start(&rt_b->rt_period_timer,
-			      rt_b->rt_period_timer.expires,
-			      HRTIMER_MODE_ABS);
+		hrtimer_start_expires(&rt_b->rt_period_timer,
+				HRTIMER_MODE_ABS);
 	}
 	spin_unlock(&rt_b->rt_runtime_lock);
 }
@@ -260,6 +266,10 @@ struct task_group {
 	struct cgroup_subsys_state css;
 #endif
 
+#ifdef CONFIG_USER_SCHED
+	uid_t uid;
+#endif
+
 #ifdef CONFIG_FAIR_GROUP_SCHED
 	/* schedulable entities of this group on each cpu */
 	struct sched_entity **se;
@@ -285,6 +295,12 @@ struct task_group {
 
 #ifdef CONFIG_USER_SCHED
 
+/* Helper function to pass uid information to create_sched_user() */
+void set_tg_uid(struct user_struct *user)
+{
+	user->tg->uid = user->uid;
+}
+
 /*
  * Root task group.
  * 	Every UID task group (including init_task_group aka UID-0) will
@@ -344,7 +360,9 @@ static inline struct task_group *task_group(struct task_struct *p)
 	struct task_group *tg;
 
 #ifdef CONFIG_USER_SCHED
-	tg = p->user->tg;
+	rcu_read_lock();
+	tg = __task_cred(p)->user->tg;
+	rcu_read_unlock();
 #elif defined(CONFIG_CGROUP_SCHED)
 	tg = container_of(task_subsys_state(p, cpu_cgroup_subsys_id),
 				struct task_group, css);
@@ -385,7 +403,6 @@ struct cfs_rq {
 
 	u64 exec_clock;
 	u64 min_vruntime;
-	u64 pair_start;
 
 	struct rb_root tasks_timeline;
 	struct rb_node *rb_leftmost;
@@ -397,9 +414,9 @@ struct cfs_rq {
 	 * 'curr' points to currently running entity on this cfs_rq.
 	 * It is set to NULL otherwise (i.e when none are currently running).
 	 */
-	struct sched_entity *curr, *next;
+	struct sched_entity *curr, *next, *last;
 
-	unsigned long nr_spread_over;
+	unsigned int nr_spread_over;
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
 	struct rq *rq;	/* cpu runqueue to which this cfs_rq is attached */
@@ -586,6 +603,8 @@ struct rq {
 #ifdef CONFIG_SCHEDSTATS
 	/* latency stats */
 	struct sched_info rq_sched_info;
+	unsigned long long rq_cpu_time;
+	/* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */
 
 	/* sys_sched_yield() stats */
 	unsigned int yld_exp_empty;
@@ -703,45 +722,18 @@ static __read_mostly char *sched_feat_names[] = {
 
 #undef SCHED_FEAT
 
-static int sched_feat_open(struct inode *inode, struct file *filp)
+static int sched_feat_show(struct seq_file *m, void *v)
 {
-	filp->private_data = inode->i_private;
-	return 0;
-}
-
-static ssize_t
-sched_feat_read(struct file *filp, char __user *ubuf,
-		size_t cnt, loff_t *ppos)
-{
-	char *buf;
-	int r = 0;
-	int len = 0;
 	int i;
 
 	for (i = 0; sched_feat_names[i]; i++) {
-		len += strlen(sched_feat_names[i]);
-		len += 4;
+		if (!(sysctl_sched_features & (1UL << i)))
+			seq_puts(m, "NO_");
+		seq_printf(m, "%s ", sched_feat_names[i]);
 	}
+	seq_puts(m, "\n");
 
-	buf = kmalloc(len + 2, GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-
-	for (i = 0; sched_feat_names[i]; i++) {
-		if (sysctl_sched_features & (1UL << i))
-			r += sprintf(buf + r, "%s ", sched_feat_names[i]);
-		else
-			r += sprintf(buf + r, "NO_%s ", sched_feat_names[i]);
-	}
-
-	r += sprintf(buf + r, "\n");
-	WARN_ON(r >= len + 2);
-
-	r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
-
-	kfree(buf);
-
-	return r;
+	return 0;
 }
 
 static ssize_t
@@ -786,10 +778,17 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
 	return cnt;
 }
 
+static int sched_feat_open(struct inode *inode, struct file *filp)
+{
+	return single_open(filp, sched_feat_show, NULL);
+}
+
 static struct file_operations sched_feat_fops = {
-	.open	= sched_feat_open,
-	.read	= sched_feat_read,
-	.write	= sched_feat_write,
+	.open		= sched_feat_open,
+	.write		= sched_feat_write,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
 };
 
 static __init int sched_init_debug(void)
@@ -818,6 +817,13 @@ const_debug unsigned int sysctl_sched_nr_migrate = 32;
 unsigned int sysctl_sched_shares_ratelimit = 250000;
 
 /*
+ * Inject some fuzzyness into changing the per-cpu group shares
+ * this avoids remote rq-locks at the expense of fairness.
+ * default: 4
+ */
+unsigned int sysctl_sched_shares_thresh = 4;
+
+/*
  * period over which we measure -rt task cpu usage in us.
  * default: 1s
  */
@@ -962,6 +968,14 @@ static struct rq *task_rq_lock(struct task_struct *p, unsigned long *flags)
 	}
 }
 
+void task_rq_unlock_wait(struct task_struct *p)
+{
+	struct rq *rq = task_rq(p);
+
+	smp_mb(); /* spin-unlock-wait is not a full memory barrier */
+	spin_unlock_wait(&rq->lock);
+}
+
 static void __task_rq_unlock(struct rq *rq)
 	__releases(rq->lock)
 {
@@ -1063,7 +1077,7 @@ static void hrtick_start(struct rq *rq, u64 delay)
 	struct hrtimer *timer = &rq->hrtick_timer;
 	ktime_t time = ktime_add_ns(timer->base->get_time(), delay);
 
-	timer->expires = time;
+	hrtimer_set_expires(timer, time);
 
 	if (rq == this_rq()) {
 		hrtimer_restart(timer);
@@ -1124,7 +1138,6 @@ static void init_rq_hrtick(struct rq *rq)
 
 	hrtimer_init(&rq->hrtick_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	rq->hrtick_timer.function = hrtick;
-	rq->hrtick_timer.cb_mode = HRTIMER_CB_IRQSAFE_PERCPU;
 }
 #else	/* CONFIG_SCHED_HRTICK */
 static inline void hrtick_clear(struct rq *rq)
@@ -1438,9 +1451,12 @@ static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd);
 static unsigned long cpu_avg_load_per_task(int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
+	unsigned long nr_running = ACCESS_ONCE(rq->nr_running);
 
-	if (rq->nr_running)
-		rq->avg_load_per_task = rq->load.weight / rq->nr_running;
+	if (nr_running)
+		rq->avg_load_per_task = rq->load.weight / nr_running;
+	else
+		rq->avg_load_per_task = 0;
 
 	return rq->avg_load_per_task;
 }
@@ -1453,30 +1469,16 @@ static void __set_se_shares(struct sched_entity *se, unsigned long shares);
  * Calculate and set the cpu's group shares.
  */
 static void
-__update_group_shares_cpu(struct task_group *tg, int cpu,
-			  unsigned long sd_shares, unsigned long sd_rq_weight)
+update_group_shares_cpu(struct task_group *tg, int cpu,
+			unsigned long sd_shares, unsigned long sd_rq_weight)
 {
-	int boost = 0;
 	unsigned long shares;
 	unsigned long rq_weight;
 
 	if (!tg->se[cpu])
 		return;
 
-	rq_weight = tg->cfs_rq[cpu]->load.weight;
-
-	/*
-	 * If there are currently no tasks on the cpu pretend there is one of
-	 * average load so that when a new task gets to run here it will not
-	 * get delayed by group starvation.
-	 */
-	if (!rq_weight) {
-		boost = 1;
-		rq_weight = NICE_0_LOAD;
-	}
-
-	if (unlikely(rq_weight > sd_rq_weight))
-		rq_weight = sd_rq_weight;
+	rq_weight = tg->cfs_rq[cpu]->rq_weight;
 
 	/*
 	 *           \Sum shares * rq_weight
@@ -1484,20 +1486,20 @@ __update_group_shares_cpu(struct task_group *tg, int cpu,
 	 *               \Sum rq_weight
 	 *
 	 */
-	shares = (sd_shares * rq_weight) / (sd_rq_weight + 1);
+	shares = (sd_shares * rq_weight) / sd_rq_weight;
+	shares = clamp_t(unsigned long, shares, MIN_SHARES, MAX_SHARES);
 
-	/*
-	 * record the actual number of shares, not the boosted amount.
-	 */
-	tg->cfs_rq[cpu]->shares = boost ? 0 : shares;
-	tg->cfs_rq[cpu]->rq_weight = rq_weight;
+	if (abs(shares - tg->se[cpu]->load.weight) >
+			sysctl_sched_shares_thresh) {
+		struct rq *rq = cpu_rq(cpu);
+		unsigned long flags;
 
-	if (shares < MIN_SHARES)
-		shares = MIN_SHARES;
-	else if (shares > MAX_SHARES)
-		shares = MAX_SHARES;
+		spin_lock_irqsave(&rq->lock, flags);
+		tg->cfs_rq[cpu]->shares = shares;
 
-	__set_se_shares(tg->se[cpu], shares);
+		__set_se_shares(tg->se[cpu], shares);
+		spin_unlock_irqrestore(&rq->lock, flags);
+	}
 }
 
 /*
@@ -1507,13 +1509,23 @@ __update_group_shares_cpu(struct task_group *tg, int cpu,
  */
 static int tg_shares_up(struct task_group *tg, void *data)
 {
-	unsigned long rq_weight = 0;
+	unsigned long weight, rq_weight = 0;
 	unsigned long shares = 0;
 	struct sched_domain *sd = data;
 	int i;
 
 	for_each_cpu_mask(i, sd->span) {
-		rq_weight += tg->cfs_rq[i]->load.weight;
+		/*
+		 * If there are currently no tasks on the cpu pretend there
+		 * is one of average load so that when a new task gets to
+		 * run here it will not get delayed by group starvation.
+		 */
+		weight = tg->cfs_rq[i]->load.weight;
+		if (!weight)
+			weight = NICE_0_LOAD;
+
+		tg->cfs_rq[i]->rq_weight = weight;
+		rq_weight += weight;
 		shares += tg->cfs_rq[i]->shares;
 	}
 
@@ -1523,17 +1535,8 @@ static int tg_shares_up(struct task_group *tg, void *data)
 	if (!sd->parent || !(sd->parent->flags & SD_LOAD_BALANCE))
 		shares = tg->shares;
 
-	if (!rq_weight)
-		rq_weight = cpus_weight(sd->span) * NICE_0_LOAD;
-
-	for_each_cpu_mask(i, sd->span) {
-		struct rq *rq = cpu_rq(i);
-		unsigned long flags;
-
-		spin_lock_irqsave(&rq->lock, flags);
-		__update_group_shares_cpu(tg, i, shares, rq_weight);
-		spin_unlock_irqrestore(&rq->lock, flags);
-	}
+	for_each_cpu_mask(i, sd->span)
+		update_group_shares_cpu(tg, i, shares, rq_weight);
 
 	return 0;
 }
@@ -1596,6 +1599,39 @@ static inline void update_shares_locked(struct rq *rq, struct sched_domain *sd)
 
 #endif
 
+/*
+ * double_lock_balance - lock the busiest runqueue, this_rq is locked already.
+ */
+static int double_lock_balance(struct rq *this_rq, struct rq *busiest)
+	__releases(this_rq->lock)
+	__acquires(busiest->lock)
+	__acquires(this_rq->lock)
+{
+	int ret = 0;
+
+	if (unlikely(!irqs_disabled())) {
+		/* printk() doesn't work good under rq->lock */
+		spin_unlock(&this_rq->lock);
+		BUG_ON(1);
+	}
+	if (unlikely(!spin_trylock(&busiest->lock))) {
+		if (busiest < this_rq) {
+			spin_unlock(&this_rq->lock);
+			spin_lock(&busiest->lock);
+			spin_lock_nested(&this_rq->lock, SINGLE_DEPTH_NESTING);
+			ret = 1;
+		} else
+			spin_lock_nested(&busiest->lock, SINGLE_DEPTH_NESTING);
+	}
+	return ret;
+}
+
+static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
+	__releases(busiest->lock)
+{
+	spin_unlock(&busiest->lock);
+	lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
+}
 #endif
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
@@ -1800,7 +1836,9 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
 	/*
 	 * Buddy candidates are cache hot:
 	 */
-	if (sched_feat(CACHE_HOT_BUDDY) && (&p->se == cfs_rq_of(&p->se)->next))
+	if (sched_feat(CACHE_HOT_BUDDY) &&
+			(&p->se == cfs_rq_of(&p->se)->next ||
+			 &p->se == cfs_rq_of(&p->se)->last))
 		return 1;
 
 	if (p->sched_class != &fair_sched_class)
@@ -1827,6 +1865,8 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
 
 	clock_offset = old_rq->clock - new_rq->clock;
 
+	trace_sched_migrate_task(p, task_cpu(p), new_cpu);
+
 #ifdef CONFIG_SCHEDSTATS
 	if (p->se.wait_start)
 		p->se.wait_start -= clock_offset;
@@ -1936,6 +1976,7 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state)
 		 * just go back and repeat.
 		 */
 		rq = task_rq_lock(p, &flags);
+		trace_sched_wait_task(rq, p);
 		running = task_running(rq, p);
 		on_rq = p->se.on_rq;
 		ncsw = 0;
@@ -2235,6 +2276,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
 
 	smp_wmb();
 	rq = task_rq_lock(p, &flags);
+	update_rq_clock(rq);
 	old_state = p->state;
 	if (!(old_state & state))
 		goto out;
@@ -2292,14 +2334,11 @@ out_activate:
 		schedstat_inc(p, se.nr_wakeups_local);
 	else
 		schedstat_inc(p, se.nr_wakeups_remote);
-	update_rq_clock(rq);
 	activate_task(rq, p, 1);
 	success = 1;
 
 out_running:
-	trace_mark(kernel_sched_wakeup,
-		"pid %d state %ld ## rq %p task %p rq->curr %p",
-		p->pid, p->state, rq, p, rq->curr);
+	trace_sched_wakeup(rq, p, success);
 	check_preempt_curr(rq, p, sync);
 
 	p->state = TASK_RUNNING;
@@ -2432,9 +2471,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
 		p->sched_class->task_new(rq, p);
 		inc_nr_running(rq);
 	}
-	trace_mark(kernel_sched_wakeup_new,
-		"pid %d state %ld ## rq %p task %p rq->curr %p",
-		p->pid, p->state, rq, p, rq->curr);
+	trace_sched_wakeup_new(rq, p, 1);
 	check_preempt_curr(rq, p, 0);
 #ifdef CONFIG_SMP
 	if (p->sched_class->task_wake_up)
@@ -2607,11 +2644,7 @@ context_switch(struct rq *rq, struct task_struct *prev,
 	struct mm_struct *mm, *oldmm;
 
 	prepare_task_switch(rq, prev, next);
-	trace_mark(kernel_sched_schedule,
-		"prev_pid %d next_pid %d prev_state %ld "
-		"## rq %p prev %p next %p",
-		prev->pid, next->pid, prev->state,
-		rq, prev, next);
+	trace_sched_switch(rq, prev, next);
 	mm = next->mm;
 	oldmm = prev->active_mm;
 	/*
@@ -2801,40 +2834,6 @@ static void double_rq_unlock(struct rq *rq1, struct rq *rq2)
 }
 
 /*
- * double_lock_balance - lock the busiest runqueue, this_rq is locked already.
- */
-static int double_lock_balance(struct rq *this_rq, struct rq *busiest)
-	__releases(this_rq->lock)
-	__acquires(busiest->lock)
-	__acquires(this_rq->lock)
-{
-	int ret = 0;
-
-	if (unlikely(!irqs_disabled())) {
-		/* printk() doesn't work good under rq->lock */
-		spin_unlock(&this_rq->lock);
-		BUG_ON(1);
-	}
-	if (unlikely(!spin_trylock(&busiest->lock))) {
-		if (busiest < this_rq) {
-			spin_unlock(&this_rq->lock);
-			spin_lock(&busiest->lock);
-			spin_lock_nested(&this_rq->lock, SINGLE_DEPTH_NESTING);
-			ret = 1;
-		} else
-			spin_lock_nested(&busiest->lock, SINGLE_DEPTH_NESTING);
-	}
-	return ret;
-}
-
-static void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
-	__releases(busiest->lock)
-{
-	spin_unlock(&busiest->lock);
-	lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
-}
-
-/*
  * If dest_cpu is allowed for this process, migrate the task to it.
  * This is accomplished by forcing the cpu_allowed mask to only
  * allow dest_cpu, which will force the cpu onto dest_cpu. Then
@@ -3344,7 +3343,7 @@ small_imbalance:
 		} else
 			this_load_per_task = cpu_avg_load_per_task(this_cpu);
 
-		if (max_load - this_load + 2*busiest_load_per_task >=
+		if (max_load - this_load + busiest_load_per_task >=
 					busiest_load_per_task * imbn) {
 			*imbalance = busiest_load_per_task;
 			return busiest;
@@ -3695,7 +3694,7 @@ out_balanced:
 static void idle_balance(int this_cpu, struct rq *this_rq)
 {
 	struct sched_domain *sd;
-	int pulled_task = -1;
+	int pulled_task = 0;
 	unsigned long next_balance = jiffies + HZ;
 	cpumask_t tmpmask;
 
@@ -4052,23 +4051,26 @@ DEFINE_PER_CPU(struct kernel_stat, kstat);
 EXPORT_PER_CPU_SYMBOL(kstat);
 
 /*
- * Return p->sum_exec_runtime plus any more ns on the sched_clock
- * that have not yet been banked in case the task is currently running.
+ * Return any ns on the sched_clock that have not yet been banked in
+ * @p in case that task is currently running.
  */
-unsigned long long task_sched_runtime(struct task_struct *p)
+unsigned long long task_delta_exec(struct task_struct *p)
 {
 	unsigned long flags;
-	u64 ns, delta_exec;
 	struct rq *rq;
+	u64 ns = 0;
 
 	rq = task_rq_lock(p, &flags);
-	ns = p->se.sum_exec_runtime;
+
 	if (task_current(rq, p)) {
+		u64 delta_exec;
+
 		update_rq_clock(rq);
 		delta_exec = rq->clock - p->se.exec_start;
 		if ((s64)delta_exec > 0)
-			ns += delta_exec;
+			ns = delta_exec;
 	}
+
 	task_rq_unlock(rq, &flags);
 
 	return ns;
@@ -4085,6 +4087,7 @@ void account_user_time(struct task_struct *p, cputime_t cputime)
 	cputime64_t tmp;
 
 	p->utime = cputime_add(p->utime, cputime);
+	account_group_user_time(p, cputime);
 
 	/* Add user time to cpustat. */
 	tmp = cputime_to_cputime64(cputime);
@@ -4109,6 +4112,7 @@ static void account_guest_time(struct task_struct *p, cputime_t cputime)
 	tmp = cputime_to_cputime64(cputime);
 
 	p->utime = cputime_add(p->utime, cputime);
+	account_group_user_time(p, cputime);
 	p->gtime = cputime_add(p->gtime, cputime);
 
 	cpustat->user = cputime64_add(cpustat->user, tmp);
@@ -4144,6 +4148,7 @@ void account_system_time(struct task_struct *p, int hardirq_offset,
 	}
 
 	p->stime = cputime_add(p->stime, cputime);
+	account_group_system_time(p, cputime);
 
 	/* Add system time to cpustat. */
 	tmp = cputime_to_cputime64(cputime);
@@ -4320,7 +4325,7 @@ void __kprobes sub_preempt_count(int val)
 	/*
 	 * Underflow?
 	 */
-	if (DEBUG_LOCKS_WARN_ON(val > preempt_count()))
+       if (DEBUG_LOCKS_WARN_ON(val > preempt_count() - (!!kernel_locked())))
 		return;
 	/*
 	 * Is the spinlock portion underflowing?
@@ -4441,12 +4446,8 @@ need_resched_nonpreemptible:
 	if (sched_feat(HRTICK))
 		hrtick_clear(rq);
 
-	/*
-	 * Do the rq-clock update outside the rq lock:
-	 */
-	local_irq_disable();
+	spin_lock_irq(&rq->lock);
 	update_rq_clock(rq);
-	spin_lock(&rq->lock);
 	clear_tsk_need_resched(prev);
 
 	if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
@@ -5119,6 +5120,22 @@ __setscheduler(struct rq *rq, struct task_struct *p, int policy, int prio)
 	set_load_weight(p);
 }
 
+/*
+ * check the target process has a UID that matches the current process's
+ */
+static bool check_same_owner(struct task_struct *p)
+{
+	const struct cred *cred = current_cred(), *pcred;
+	bool match;
+
+	rcu_read_lock();
+	pcred = __task_cred(p);
+	match = (cred->euid == pcred->euid ||
+		 cred->euid == pcred->uid);
+	rcu_read_unlock();
+	return match;
+}
+
 static int __sched_setscheduler(struct task_struct *p, int policy,
 				struct sched_param *param, bool user)
 {
@@ -5178,8 +5195,7 @@ recheck:
 			return -EPERM;
 
 		/* can't change other user's priorities */
-		if ((current->euid != p->euid) &&
-		    (current->euid != p->uid))
+		if (!check_same_owner(p))
 			return -EPERM;
 	}
 
@@ -5411,8 +5427,7 @@ long sched_setaffinity(pid_t pid, const cpumask_t *in_mask)
 	read_unlock(&tasklist_lock);
 
 	retval = -EPERM;
-	if ((current->euid != p->euid) && (current->euid != p->uid) &&
-			!capable(CAP_SYS_NICE))
+	if (!check_same_owner(p) && !capable(CAP_SYS_NICE))
 		goto out_unlock;
 
 	retval = security_task_setscheduler(p, 0, NULL);
@@ -5851,6 +5866,8 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
 	struct rq *rq = cpu_rq(cpu);
 	unsigned long flags;
 
+	spin_lock_irqsave(&rq->lock, flags);
+
 	__sched_fork(idle);
 	idle->se.exec_start = sched_clock();
 
@@ -5858,7 +5875,6 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
 	idle->cpus_allowed = cpumask_of_cpu(cpu);
 	__set_task_cpu(idle, cpu);
 
-	spin_lock_irqsave(&rq->lock, flags);
 	rq->curr = rq->idle = idle;
 #if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW)
 	idle->oncpu = 1;
@@ -5875,6 +5891,7 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
 	 * The idle tasks have their own, simple scheduling class:
 	 */
 	idle->sched_class = &idle_sched_class;
+	ftrace_graph_init_task(idle);
 }
 
 /*
@@ -6105,7 +6122,6 @@ static int __migrate_task_irq(struct task_struct *p, int src_cpu, int dest_cpu)
 
 /*
  * Figure out where task on dead CPU should go, use force if necessary.
- * NOTE: interrupts should be disabled by the caller
  */
 static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p)
 {
@@ -6566,7 +6582,9 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
 			req = list_entry(rq->migration_queue.next,
 					 struct migration_req, list);
 			list_del_init(&req->list);
+			spin_unlock_irq(&rq->lock);
 			complete(&req->done);
+			spin_lock_irq(&rq->lock);
 		}
 		spin_unlock_irq(&rq->lock);
 		break;
@@ -6615,28 +6633,6 @@ early_initcall(migration_init);
 
 #ifdef CONFIG_SCHED_DEBUG
 
-static inline const char *sd_level_to_string(enum sched_domain_level lvl)
-{
-	switch (lvl) {
-	case SD_LV_NONE:
-			return "NONE";
-	case SD_LV_SIBLING:
-			return "SIBLING";
-	case SD_LV_MC:
-			return "MC";
-	case SD_LV_CPU:
-			return "CPU";
-	case SD_LV_NODE:
-			return "NODE";
-	case SD_LV_ALLNODES:
-			return "ALLNODES";
-	case SD_LV_MAX:
-			return "MAX";
-
-	}
-	return "MAX";
-}
-
 static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
 				  cpumask_t *groupmask)
 {
@@ -6656,8 +6652,7 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
 		return -1;
 	}
 
-	printk(KERN_CONT "span %s level %s\n",
-		str, sd_level_to_string(sd->level));
+	printk(KERN_CONT "span %s level %s\n", str, sd->name);
 
 	if (!cpu_isset(cpu, sd->span)) {
 		printk(KERN_ERR "ERROR: domain->span does not contain "
@@ -6793,6 +6788,8 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
 				SD_BALANCE_EXEC |
 				SD_SHARE_CPUPOWER |
 				SD_SHARE_PKG_RESOURCES);
+		if (nr_node_ids == 1)
+			pflags &= ~SD_SERIALIZE;
 	}
 	if (~cflags & pflags)
 		return 0;
@@ -6868,15 +6865,17 @@ cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu)
 	struct sched_domain *tmp;
 
 	/* Remove the sched domains which do not contribute to scheduling. */
-	for (tmp = sd; tmp; tmp = tmp->parent) {
+	for (tmp = sd; tmp; ) {
 		struct sched_domain *parent = tmp->parent;
 		if (!parent)
 			break;
+
 		if (sd_parent_degenerate(tmp, parent)) {
 			tmp->parent = parent->parent;
 			if (parent->parent)
 				parent->parent->child = tmp;
-		}
+		} else
+			tmp = tmp->parent;
 	}
 
 	if (sd && sd_degenerate(sd)) {
@@ -7311,13 +7310,21 @@ struct allmasks {
 };
 
 #if	NR_CPUS > 128
-#define	SCHED_CPUMASK_ALLOC		1
-#define	SCHED_CPUMASK_FREE(v)		kfree(v)
-#define	SCHED_CPUMASK_DECLARE(v)	struct allmasks *v
+#define SCHED_CPUMASK_DECLARE(v)	struct allmasks *v
+static inline void sched_cpumask_alloc(struct allmasks **masks)
+{
+	*masks = kmalloc(sizeof(**masks), GFP_KERNEL);
+}
+static inline void sched_cpumask_free(struct allmasks *masks)
+{
+	kfree(masks);
+}
 #else
-#define	SCHED_CPUMASK_ALLOC		0
-#define	SCHED_CPUMASK_FREE(v)
-#define	SCHED_CPUMASK_DECLARE(v)	struct allmasks _v, *v = &_v
+#define SCHED_CPUMASK_DECLARE(v)	struct allmasks _v, *v = &_v
+static inline void sched_cpumask_alloc(struct allmasks **masks)
+{ }
+static inline void sched_cpumask_free(struct allmasks *masks)
+{ }
 #endif
 
 #define	SCHED_CPUMASK_VAR(v, a) 	cpumask_t *v = (cpumask_t *) \
@@ -7393,9 +7400,8 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
 		return -ENOMEM;
 	}
 
-#if SCHED_CPUMASK_ALLOC
 	/* get space for all scratch cpumask variables */
-	allmasks = kmalloc(sizeof(*allmasks), GFP_KERNEL);
+	sched_cpumask_alloc(&allmasks);
 	if (!allmasks) {
 		printk(KERN_WARNING "Cannot alloc cpumask array\n");
 		kfree(rd);
@@ -7404,7 +7410,7 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
 #endif
 		return -ENOMEM;
 	}
-#endif
+
 	tmpmask = (cpumask_t *)allmasks;
 
 
@@ -7658,13 +7664,14 @@ static int __build_sched_domains(const cpumask_t *cpu_map,
 		cpu_attach_domain(sd, rd, i);
 	}
 
-	SCHED_CPUMASK_FREE((void *)allmasks);
+	sched_cpumask_free(allmasks);
 	return 0;
 
 #ifdef CONFIG_NUMA
 error:
 	free_sched_groups(cpu_map, tmpmask);
-	SCHED_CPUMASK_FREE((void *)allmasks);
+	sched_cpumask_free(allmasks);
+	kfree(rd);
 	return -ENOMEM;
 #endif
 }
@@ -7686,8 +7693,14 @@ static struct sched_domain_attr *dattr_cur;
  */
 static cpumask_t fallback_doms;
 
-void __attribute__((weak)) arch_update_cpu_topology(void)
+/*
+ * arch_update_cpu_topology lets virtualized architectures update the
+ * cpu core maps. It is supposed to return 1 if the topology changed
+ * or 0 if it stayed the same.
+ */
+int __attribute__((weak)) arch_update_cpu_topology(void)
 {
+	return 0;
 }
 
 /*
@@ -7727,8 +7740,6 @@ static void detach_destroy_domains(const cpumask_t *cpu_map)
 	cpumask_t tmpmask;
 	int i;
 
-	unregister_sched_domain_sysctl();
-
 	for_each_cpu_mask_nr(i, *cpu_map)
 		cpu_attach_domain(NULL, &def_root_domain, i);
 	synchronize_sched();
@@ -7766,13 +7777,14 @@ static int dattrs_equal(struct sched_domain_attr *cur, int idx_cur,
  *
  * The passed in 'doms_new' should be kmalloc'd. This routine takes
  * ownership of it and will kfree it when done with it. If the caller
- * failed the kmalloc call, then it can pass in doms_new == NULL,
- * and partition_sched_domains() will fallback to the single partition
- * 'fallback_doms', it also forces the domains to be rebuilt.
+ * failed the kmalloc call, then it can pass in doms_new == NULL &&
+ * ndoms_new == 1, and partition_sched_domains() will fallback to
+ * the single partition 'fallback_doms', it also forces the domains
+ * to be rebuilt.
  *
- * If doms_new==NULL it will be replaced with cpu_online_map.
- * ndoms_new==0 is a special case for destroying existing domains.
- * It will not create the default domain.
+ * If doms_new == NULL it will be replaced with cpu_online_map.
+ * ndoms_new == 0 is a special case for destroying existing domains,
+ * and it will not create the default domain.
  *
  * Call with hotplug lock held
  */
@@ -7780,17 +7792,21 @@ void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
 			     struct sched_domain_attr *dattr_new)
 {
 	int i, j, n;
+	int new_topology;
 
 	mutex_lock(&sched_domains_mutex);
 
 	/* always unregister in case we don't destroy any domains */
 	unregister_sched_domain_sysctl();
 
+	/* Let architecture update cpu core mappings. */
+	new_topology = arch_update_cpu_topology();
+
 	n = doms_new ? ndoms_new : 0;
 
 	/* Destroy deleted domains */
 	for (i = 0; i < ndoms_cur; i++) {
-		for (j = 0; j < n; j++) {
+		for (j = 0; j < n && !new_topology; j++) {
 			if (cpus_equal(doms_cur[i], doms_new[j])
 			    && dattrs_equal(dattr_cur, i, dattr_new, j))
 				goto match1;
@@ -7805,12 +7821,12 @@ match1:
 		ndoms_cur = 0;
 		doms_new = &fallback_doms;
 		cpus_andnot(doms_new[0], cpu_online_map, cpu_isolated_map);
-		dattr_new = NULL;
+		WARN_ON_ONCE(dattr_new);
 	}
 
 	/* Build new domains */
 	for (i = 0; i < ndoms_new; i++) {
-		for (j = 0; j < ndoms_cur; j++) {
+		for (j = 0; j < ndoms_cur && !new_topology; j++) {
 			if (cpus_equal(doms_new[i], doms_cur[j])
 			    && dattrs_equal(dattr_new, i, dattr_cur, j))
 				goto match2;
@@ -8465,7 +8481,7 @@ static
 int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
 {
 	struct cfs_rq *cfs_rq;
-	struct sched_entity *se, *parent_se;
+	struct sched_entity *se;
 	struct rq *rq;
 	int i;
 
@@ -8481,18 +8497,17 @@ int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
 	for_each_possible_cpu(i) {
 		rq = cpu_rq(i);
 
-		cfs_rq = kmalloc_node(sizeof(struct cfs_rq),
-				GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
+		cfs_rq = kzalloc_node(sizeof(struct cfs_rq),
+				      GFP_KERNEL, cpu_to_node(i));
 		if (!cfs_rq)
 			goto err;
 
-		se = kmalloc_node(sizeof(struct sched_entity),
-				GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
+		se = kzalloc_node(sizeof(struct sched_entity),
+				  GFP_KERNEL, cpu_to_node(i));
 		if (!se)
 			goto err;
 
-		parent_se = parent ? parent->se[i] : NULL;
-		init_tg_cfs_entry(tg, cfs_rq, se, i, 0, parent_se);
+		init_tg_cfs_entry(tg, cfs_rq, se, i, 0, parent->se[i]);
 	}
 
 	return 1;
@@ -8553,7 +8568,7 @@ static
 int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
 {
 	struct rt_rq *rt_rq;
-	struct sched_rt_entity *rt_se, *parent_se;
+	struct sched_rt_entity *rt_se;
 	struct rq *rq;
 	int i;
 
@@ -8570,18 +8585,17 @@ int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
 	for_each_possible_cpu(i) {
 		rq = cpu_rq(i);
 
-		rt_rq = kmalloc_node(sizeof(struct rt_rq),
-				GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
+		rt_rq = kzalloc_node(sizeof(struct rt_rq),
+				     GFP_KERNEL, cpu_to_node(i));
 		if (!rt_rq)
 			goto err;
 
-		rt_se = kmalloc_node(sizeof(struct sched_rt_entity),
-				GFP_KERNEL|__GFP_ZERO, cpu_to_node(i));
+		rt_se = kzalloc_node(sizeof(struct sched_rt_entity),
+				     GFP_KERNEL, cpu_to_node(i));
 		if (!rt_se)
 			goto err;
 
-		parent_se = parent ? parent->rt_se[i] : NULL;
-		init_tg_rt_entry(tg, rt_rq, rt_se, i, 0, parent_se);
+		init_tg_rt_entry(tg, rt_rq, rt_se, i, 0, parent->rt_se[i]);
 	}
 
 	return 1;
@@ -9224,11 +9238,12 @@ struct cgroup_subsys cpu_cgroup_subsys = {
  * (balbir@in.ibm.com).
  */
 
-/* track cpu usage of a group of tasks */
+/* track cpu usage of a group of tasks and its child groups */
 struct cpuacct {
 	struct cgroup_subsys_state css;
 	/* cpuusage holds pointer to a u64-type object on every cpu */
 	u64 *cpuusage;
+	struct cpuacct *parent;
 };
 
 struct cgroup_subsys cpuacct_subsys;
@@ -9262,6 +9277,9 @@ static struct cgroup_subsys_state *cpuacct_create(
 		return ERR_PTR(-ENOMEM);
 	}
 
+	if (cgrp->parent)
+		ca->parent = cgroup_ca(cgrp->parent);
+
 	return &ca->css;
 }
 
@@ -9275,6 +9293,41 @@ cpuacct_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
 	kfree(ca);
 }
 
+static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu)
+{
+	u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
+	u64 data;
+
+#ifndef CONFIG_64BIT
+	/*
+	 * Take rq->lock to make 64-bit read safe on 32-bit platforms.
+	 */
+	spin_lock_irq(&cpu_rq(cpu)->lock);
+	data = *cpuusage;
+	spin_unlock_irq(&cpu_rq(cpu)->lock);
+#else
+	data = *cpuusage;
+#endif
+
+	return data;
+}
+
+static void cpuacct_cpuusage_write(struct cpuacct *ca, int cpu, u64 val)
+{
+	u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
+
+#ifndef CONFIG_64BIT
+	/*
+	 * Take rq->lock to make 64-bit write safe on 32-bit platforms.
+	 */
+	spin_lock_irq(&cpu_rq(cpu)->lock);
+	*cpuusage = val;
+	spin_unlock_irq(&cpu_rq(cpu)->lock);
+#else
+	*cpuusage = val;
+#endif
+}
+
 /* return total cpu usage (in nanoseconds) of a group */
 static u64 cpuusage_read(struct cgroup *cgrp, struct cftype *cft)
 {
@@ -9282,17 +9335,8 @@ static u64 cpuusage_read(struct cgroup *cgrp, struct cftype *cft)
 	u64 totalcpuusage = 0;
 	int i;
 
-	for_each_possible_cpu(i) {
-		u64 *cpuusage = percpu_ptr(ca->cpuusage, i);
-
-		/*
-		 * Take rq->lock to make 64-bit addition safe on 32-bit
-		 * platforms.
-		 */
-		spin_lock_irq(&cpu_rq(i)->lock);
-		totalcpuusage += *cpuusage;
-		spin_unlock_irq(&cpu_rq(i)->lock);
-	}
+	for_each_present_cpu(i)
+		totalcpuusage += cpuacct_cpuusage_read(ca, i);
 
 	return totalcpuusage;
 }
@@ -9309,23 +9353,39 @@ static int cpuusage_write(struct cgroup *cgrp, struct cftype *cftype,
 		goto out;
 	}
 
-	for_each_possible_cpu(i) {
-		u64 *cpuusage = percpu_ptr(ca->cpuusage, i);
+	for_each_present_cpu(i)
+		cpuacct_cpuusage_write(ca, i, 0);
 
-		spin_lock_irq(&cpu_rq(i)->lock);
-		*cpuusage = 0;
-		spin_unlock_irq(&cpu_rq(i)->lock);
-	}
 out:
 	return err;
 }
 
+static int cpuacct_percpu_seq_read(struct cgroup *cgroup, struct cftype *cft,
+				   struct seq_file *m)
+{
+	struct cpuacct *ca = cgroup_ca(cgroup);
+	u64 percpu;
+	int i;
+
+	for_each_present_cpu(i) {
+		percpu = cpuacct_cpuusage_read(ca, i);
+		seq_printf(m, "%llu ", (unsigned long long) percpu);
+	}
+	seq_printf(m, "\n");
+	return 0;
+}
+
 static struct cftype files[] = {
 	{
 		.name = "usage",
 		.read_u64 = cpuusage_read,
 		.write_u64 = cpuusage_write,
 	},
+	{
+		.name = "usage_percpu",
+		.read_seq_string = cpuacct_percpu_seq_read,
+	},
+
 };
 
 static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
@@ -9341,14 +9401,16 @@ static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
 static void cpuacct_charge(struct task_struct *tsk, u64 cputime)
 {
 	struct cpuacct *ca;
+	int cpu;
 
 	if (!cpuacct_subsys.active)
 		return;
 
+	cpu = task_cpu(tsk);
 	ca = task_ca(tsk);
-	if (ca) {
-		u64 *cpuusage = percpu_ptr(ca->cpuusage, task_cpu(tsk));
 
+	for (; ca; ca = ca->parent) {
+		u64 *cpuusage = percpu_ptr(ca->cpuusage, cpu);
 		*cpuusage += cputime;
 	}
 }
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index ad958c1ec708..4293cfa9681d 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -53,6 +53,40 @@ static unsigned long nsec_low(unsigned long long nsec)
 
 #define SPLIT_NS(x) nsec_high(x), nsec_low(x)
 
+#ifdef CONFIG_FAIR_GROUP_SCHED
+static void print_cfs_group_stats(struct seq_file *m, int cpu,
+		struct task_group *tg)
+{
+	struct sched_entity *se = tg->se[cpu];
+	if (!se)
+		return;
+
+#define P(F) \
+	SEQ_printf(m, "  .%-30s: %lld\n", #F, (long long)F)
+#define PN(F) \
+	SEQ_printf(m, "  .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
+
+	PN(se->exec_start);
+	PN(se->vruntime);
+	PN(se->sum_exec_runtime);
+#ifdef CONFIG_SCHEDSTATS
+	PN(se->wait_start);
+	PN(se->sleep_start);
+	PN(se->block_start);
+	PN(se->sleep_max);
+	PN(se->block_max);
+	PN(se->exec_max);
+	PN(se->slice_max);
+	PN(se->wait_max);
+	PN(se->wait_sum);
+	P(se->wait_count);
+#endif
+	P(se->load.weight);
+#undef PN
+#undef P
+}
+#endif
+
 static void
 print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
 {
@@ -121,20 +155,19 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 
 #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
 	char path[128] = "";
-	struct cgroup *cgroup = NULL;
 	struct task_group *tg = cfs_rq->tg;
 
-	if (tg)
-		cgroup = tg->css.cgroup;
-
-	if (cgroup)
-		cgroup_path(cgroup, path, sizeof(path));
+	cgroup_path(tg->css.cgroup, path, sizeof(path));
 
 	SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path);
+#elif defined(CONFIG_USER_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
+	{
+		uid_t uid = cfs_rq->tg->uid;
+		SEQ_printf(m, "\ncfs_rq[%d] for UID: %u\n", cpu, uid);
+	}
 #else
 	SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
 #endif
-
 	SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "exec_clock",
 			SPLIT_NS(cfs_rq->exec_clock));
 
@@ -144,7 +177,7 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 	last = __pick_last_entity(cfs_rq);
 	if (last)
 		max_vruntime = last->vruntime;
-	min_vruntime = rq->cfs.min_vruntime;
+	min_vruntime = cfs_rq->min_vruntime;
 	rq0_min_vruntime = per_cpu(runqueues, 0).cfs.min_vruntime;
 	spin_unlock_irqrestore(&rq->lock, flags);
 	SEQ_printf(m, "  .%-30s: %Ld.%06ld\n", "MIN_vruntime",
@@ -161,31 +194,14 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 			SPLIT_NS(spread0));
 	SEQ_printf(m, "  .%-30s: %ld\n", "nr_running", cfs_rq->nr_running);
 	SEQ_printf(m, "  .%-30s: %ld\n", "load", cfs_rq->load.weight);
-#ifdef CONFIG_SCHEDSTATS
-#define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, rq->n);
-
-	P(yld_exp_empty);
-	P(yld_act_empty);
-	P(yld_both_empty);
-	P(yld_count);
-
-	P(sched_switch);
-	P(sched_count);
-	P(sched_goidle);
 
-	P(ttwu_count);
-	P(ttwu_local);
-
-	P(bkl_count);
-
-#undef P
-#endif
-	SEQ_printf(m, "  .%-30s: %ld\n", "nr_spread_over",
+	SEQ_printf(m, "  .%-30s: %d\n", "nr_spread_over",
 			cfs_rq->nr_spread_over);
 #ifdef CONFIG_FAIR_GROUP_SCHED
 #ifdef CONFIG_SMP
 	SEQ_printf(m, "  .%-30s: %lu\n", "shares", cfs_rq->shares);
 #endif
+	print_cfs_group_stats(m, cpu, cfs_rq->tg);
 #endif
 }
 
@@ -193,14 +209,9 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
 {
 #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_RT_GROUP_SCHED)
 	char path[128] = "";
-	struct cgroup *cgroup = NULL;
 	struct task_group *tg = rt_rq->tg;
 
-	if (tg)
-		cgroup = tg->css.cgroup;
-
-	if (cgroup)
-		cgroup_path(cgroup, path, sizeof(path));
+	cgroup_path(tg->css.cgroup, path, sizeof(path));
 
 	SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, path);
 #else
@@ -260,6 +271,25 @@ static void print_cpu(struct seq_file *m, int cpu)
 #undef P
 #undef PN
 
+#ifdef CONFIG_SCHEDSTATS
+#define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, rq->n);
+
+	P(yld_exp_empty);
+	P(yld_act_empty);
+	P(yld_both_empty);
+	P(yld_count);
+
+	P(sched_switch);
+	P(sched_count);
+	P(sched_goidle);
+
+	P(ttwu_count);
+	P(ttwu_local);
+
+	P(bkl_count);
+
+#undef P
+#endif
 	print_cfs_stats(m, cpu);
 	print_rt_stats(m, cpu);
 
@@ -271,7 +301,7 @@ static int sched_debug_show(struct seq_file *m, void *v)
 	u64 now = ktime_to_ns(ktime_get());
 	int cpu;
 
-	SEQ_printf(m, "Sched Debug Version: v0.07, %s %.*s\n",
+	SEQ_printf(m, "Sched Debug Version: v0.08, %s %.*s\n",
 		init_utsname()->release,
 		(int)strcspn(init_utsname()->version, " "),
 		init_utsname()->version);
@@ -319,7 +349,7 @@ static int __init init_sched_debug_procfs(void)
 {
 	struct proc_dir_entry *pe;
 
-	pe = proc_create("sched_debug", 0644, NULL, &sched_debug_fops);
+	pe = proc_create("sched_debug", 0444, NULL, &sched_debug_fops);
 	if (!pe)
 		return -ENOMEM;
 	return 0;
@@ -422,10 +452,11 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 #undef __P
 
 	{
+		unsigned int this_cpu = raw_smp_processor_id();
 		u64 t0, t1;
 
-		t0 = sched_clock();
-		t1 = sched_clock();
+		t0 = cpu_clock(this_cpu);
+		t1 = cpu_clock(this_cpu);
 		SEQ_printf(m, "%-35s:%21Ld\n",
 			   "clock-delta", (long long)(t1-t0));
 	}
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 18fd17172eb6..5ad4440f0fc4 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -73,6 +73,8 @@ unsigned int sysctl_sched_wakeup_granularity = 5000000UL;
 
 const_debug unsigned int sysctl_sched_migration_cost = 500000UL;
 
+static const struct sched_class fair_sched_class;
+
 /**************************************************************
  * CFS operations on generic schedulable entities:
  */
@@ -141,6 +143,49 @@ static inline struct sched_entity *parent_entity(struct sched_entity *se)
 	return se->parent;
 }
 
+/* return depth at which a sched entity is present in the hierarchy */
+static inline int depth_se(struct sched_entity *se)
+{
+	int depth = 0;
+
+	for_each_sched_entity(se)
+		depth++;
+
+	return depth;
+}
+
+static void
+find_matching_se(struct sched_entity **se, struct sched_entity **pse)
+{
+	int se_depth, pse_depth;
+
+	/*
+	 * preemption test can be made between sibling entities who are in the
+	 * same cfs_rq i.e who have a common parent. Walk up the hierarchy of
+	 * both tasks until we find their ancestors who are siblings of common
+	 * parent.
+	 */
+
+	/* First walk up until both entities are at same depth */
+	se_depth = depth_se(*se);
+	pse_depth = depth_se(*pse);
+
+	while (se_depth > pse_depth) {
+		se_depth--;
+		*se = parent_entity(*se);
+	}
+
+	while (pse_depth > se_depth) {
+		pse_depth--;
+		*pse = parent_entity(*pse);
+	}
+
+	while (!is_same_group(*se, *pse)) {
+		*se = parent_entity(*se);
+		*pse = parent_entity(*pse);
+	}
+}
+
 #else	/* CONFIG_FAIR_GROUP_SCHED */
 
 static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
@@ -191,6 +236,11 @@ static inline struct sched_entity *parent_entity(struct sched_entity *se)
 	return NULL;
 }
 
+static inline void
+find_matching_se(struct sched_entity **se, struct sched_entity **pse)
+{
+}
+
 #endif	/* CONFIG_FAIR_GROUP_SCHED */
 
 
@@ -221,6 +271,27 @@ static inline s64 entity_key(struct cfs_rq *cfs_rq, struct sched_entity *se)
 	return se->vruntime - cfs_rq->min_vruntime;
 }
 
+static void update_min_vruntime(struct cfs_rq *cfs_rq)
+{
+	u64 vruntime = cfs_rq->min_vruntime;
+
+	if (cfs_rq->curr)
+		vruntime = cfs_rq->curr->vruntime;
+
+	if (cfs_rq->rb_leftmost) {
+		struct sched_entity *se = rb_entry(cfs_rq->rb_leftmost,
+						   struct sched_entity,
+						   run_node);
+
+		if (vruntime == cfs_rq->min_vruntime)
+			vruntime = se->vruntime;
+		else
+			vruntime = min_vruntime(vruntime, se->vruntime);
+	}
+
+	cfs_rq->min_vruntime = max_vruntime(cfs_rq->min_vruntime, vruntime);
+}
+
 /*
  * Enqueue an entity into the rb-tree:
  */
@@ -254,15 +325,8 @@ static void __enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
 	 * Maintain a cache of leftmost tree entries (it is frequently
 	 * used):
 	 */
-	if (leftmost) {
+	if (leftmost)
 		cfs_rq->rb_leftmost = &se->run_node;
-		/*
-		 * maintain cfs_rq->min_vruntime to be a monotonic increasing
-		 * value tracking the leftmost vruntime in the tree.
-		 */
-		cfs_rq->min_vruntime =
-			max_vruntime(cfs_rq->min_vruntime, se->vruntime);
-	}
 
 	rb_link_node(&se->run_node, parent, link);
 	rb_insert_color(&se->run_node, &cfs_rq->tasks_timeline);
@@ -272,37 +336,25 @@ static void __dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
 	if (cfs_rq->rb_leftmost == &se->run_node) {
 		struct rb_node *next_node;
-		struct sched_entity *next;
 
 		next_node = rb_next(&se->run_node);
 		cfs_rq->rb_leftmost = next_node;
-
-		if (next_node) {
-			next = rb_entry(next_node,
-					struct sched_entity, run_node);
-			cfs_rq->min_vruntime =
-				max_vruntime(cfs_rq->min_vruntime,
-					     next->vruntime);
-		}
 	}
 
-	if (cfs_rq->next == se)
-		cfs_rq->next = NULL;
-
 	rb_erase(&se->run_node, &cfs_rq->tasks_timeline);
 }
 
-static inline struct rb_node *first_fair(struct cfs_rq *cfs_rq)
-{
-	return cfs_rq->rb_leftmost;
-}
-
 static struct sched_entity *__pick_next_entity(struct cfs_rq *cfs_rq)
 {
-	return rb_entry(first_fair(cfs_rq), struct sched_entity, run_node);
+	struct rb_node *left = cfs_rq->rb_leftmost;
+
+	if (!left)
+		return NULL;
+
+	return rb_entry(left, struct sched_entity, run_node);
 }
 
-static inline struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq)
+static struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq)
 {
 	struct rb_node *last = rb_last(&cfs_rq->tasks_timeline);
 
@@ -334,7 +386,7 @@ int sched_nr_latency_handler(struct ctl_table *table, int write,
 #endif
 
 /*
- * delta *= w / rw
+ * delta *= P[w / rw]
  */
 static inline unsigned long
 calc_delta_weight(unsigned long delta, struct sched_entity *se)
@@ -348,15 +400,13 @@ calc_delta_weight(unsigned long delta, struct sched_entity *se)
 }
 
 /*
- * delta *= rw / w
+ * delta /= w
  */
 static inline unsigned long
 calc_delta_fair(unsigned long delta, struct sched_entity *se)
 {
-	for_each_sched_entity(se) {
-		delta = calc_delta_mine(delta,
-				cfs_rq_of(se)->load.weight, &se->load);
-	}
+	if (unlikely(se->load.weight != NICE_0_LOAD))
+		delta = calc_delta_mine(delta, NICE_0_LOAD, &se->load);
 
 	return delta;
 }
@@ -386,26 +436,26 @@ static u64 __sched_period(unsigned long nr_running)
  * We calculate the wall-time slice from the period by taking a part
  * proportional to the weight.
  *
- * s = p*w/rw
+ * s = p*P[w/rw]
  */
 static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
-	return calc_delta_weight(__sched_period(cfs_rq->nr_running), se);
+	unsigned long nr_running = cfs_rq->nr_running;
+
+	if (unlikely(!se->on_rq))
+		nr_running++;
+
+	return calc_delta_weight(__sched_period(nr_running), se);
 }
 
 /*
  * We calculate the vruntime slice of a to be inserted task
  *
- * vs = s*rw/w = p
+ * vs = s/w
  */
-static u64 sched_vslice_add(struct cfs_rq *cfs_rq, struct sched_entity *se)
+static u64 sched_vslice(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
-	unsigned long nr_running = cfs_rq->nr_running;
-
-	if (!se->on_rq)
-		nr_running++;
-
-	return __sched_period(nr_running);
+	return calc_delta_fair(sched_slice(cfs_rq, se), se);
 }
 
 /*
@@ -424,6 +474,7 @@ __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr,
 	schedstat_add(cfs_rq, exec_clock, delta_exec);
 	delta_exec_weighted = calc_delta_fair(delta_exec, curr);
 	curr->vruntime += delta_exec_weighted;
+	update_min_vruntime(cfs_rq);
 }
 
 static void update_curr(struct cfs_rq *cfs_rq)
@@ -441,6 +492,8 @@ static void update_curr(struct cfs_rq *cfs_rq)
 	 * overflow on 32 bits):
 	 */
 	delta_exec = (unsigned long)(now - curr->exec_start);
+	if (!delta_exec)
+		return;
 
 	__update_curr(cfs_rq, curr, delta_exec);
 	curr->exec_start = now;
@@ -449,6 +502,7 @@ static void update_curr(struct cfs_rq *cfs_rq)
 		struct task_struct *curtask = task_of(curr);
 
 		cpuacct_charge(curtask, delta_exec);
+		account_group_exec_runtime(curtask, delta_exec);
 	}
 }
 
@@ -612,13 +666,7 @@ static void check_spread(struct cfs_rq *cfs_rq, struct sched_entity *se)
 static void
 place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
 {
-	u64 vruntime;
-
-	if (first_fair(cfs_rq)) {
-		vruntime = min_vruntime(cfs_rq->min_vruntime,
-				__pick_next_entity(cfs_rq)->vruntime);
-	} else
-		vruntime = cfs_rq->min_vruntime;
+	u64 vruntime = cfs_rq->min_vruntime;
 
 	/*
 	 * The 'current' period is already promised to the current tasks,
@@ -627,7 +675,7 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
 	 * stays open at the end.
 	 */
 	if (initial && sched_feat(START_DEBIT))
-		vruntime += sched_vslice_add(cfs_rq, se);
+		vruntime += sched_vslice(cfs_rq, se);
 
 	if (!initial) {
 		/* sleeps upto a single latency don't count. */
@@ -670,6 +718,15 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int wakeup)
 		__enqueue_entity(cfs_rq, se);
 }
 
+static void clear_buddies(struct cfs_rq *cfs_rq, struct sched_entity *se)
+{
+	if (cfs_rq->last == se)
+		cfs_rq->last = NULL;
+
+	if (cfs_rq->next == se)
+		cfs_rq->next = NULL;
+}
+
 static void
 dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int sleep)
 {
@@ -692,9 +749,12 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int sleep)
 #endif
 	}
 
+	clear_buddies(cfs_rq, se);
+
 	if (se != cfs_rq->curr)
 		__dequeue_entity(cfs_rq, se);
 	account_entity_dequeue(cfs_rq, se);
+	update_min_vruntime(cfs_rq);
 }
 
 /*
@@ -741,29 +801,18 @@ set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
 	se->prev_sum_exec_runtime = se->sum_exec_runtime;
 }
 
-static struct sched_entity *
-pick_next(struct cfs_rq *cfs_rq, struct sched_entity *se)
-{
-	struct rq *rq = rq_of(cfs_rq);
-	u64 pair_slice = rq->clock - cfs_rq->pair_start;
-
-	if (!cfs_rq->next || pair_slice > sched_slice(cfs_rq, cfs_rq->next)) {
-		cfs_rq->pair_start = rq->clock;
-		return se;
-	}
-
-	return cfs_rq->next;
-}
+static int
+wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se);
 
 static struct sched_entity *pick_next_entity(struct cfs_rq *cfs_rq)
 {
-	struct sched_entity *se = NULL;
+	struct sched_entity *se = __pick_next_entity(cfs_rq);
 
-	if (first_fair(cfs_rq)) {
-		se = __pick_next_entity(cfs_rq);
-		se = pick_next(cfs_rq, se);
-		set_next_entity(cfs_rq, se);
-	}
+	if (cfs_rq->next && wakeup_preempt_entity(cfs_rq->next, se) < 1)
+		return cfs_rq->next;
+
+	if (cfs_rq->last && wakeup_preempt_entity(cfs_rq->last, se) < 1)
+		return cfs_rq->last;
 
 	return se;
 }
@@ -848,11 +897,31 @@ static void hrtick_start_fair(struct rq *rq, struct task_struct *p)
 		hrtick_start(rq, delta);
 	}
 }
+
+/*
+ * called from enqueue/dequeue and updates the hrtick when the
+ * current task is from our class and nr_running is low enough
+ * to matter.
+ */
+static void hrtick_update(struct rq *rq)
+{
+	struct task_struct *curr = rq->curr;
+
+	if (curr->sched_class != &fair_sched_class)
+		return;
+
+	if (cfs_rq_of(&curr->se)->nr_running < sched_nr_latency)
+		hrtick_start_fair(rq, curr);
+}
 #else /* !CONFIG_SCHED_HRTICK */
 static inline void
 hrtick_start_fair(struct rq *rq, struct task_struct *p)
 {
 }
+
+static inline void hrtick_update(struct rq *rq)
+{
+}
 #endif
 
 /*
@@ -873,7 +942,7 @@ static void enqueue_task_fair(struct rq *rq, struct task_struct *p, int wakeup)
 		wakeup = 1;
 	}
 
-	hrtick_start_fair(rq, rq->curr);
+	hrtick_update(rq);
 }
 
 /*
@@ -895,7 +964,7 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int sleep)
 		sleep = 1;
 	}
 
-	hrtick_start_fair(rq, rq->curr);
+	hrtick_update(rq);
 }
 
 /*
@@ -915,6 +984,8 @@ static void yield_task_fair(struct rq *rq)
 	if (unlikely(cfs_rq->nr_running == 1))
 		return;
 
+	clear_buddies(cfs_rq, se);
+
 	if (likely(!sysctl_sched_compat_yield) && curr->policy != SCHED_BATCH) {
 		update_rq_clock(rq);
 		/*
@@ -1001,8 +1072,6 @@ static inline int wake_idle(int cpu, struct task_struct *p)
 
 #ifdef CONFIG_SMP
 
-static const struct sched_class fair_sched_class;
-
 #ifdef CONFIG_FAIR_GROUP_SCHED
 /*
  * effective_load() calculates the load change as seen from the root_task_group
@@ -1103,10 +1172,9 @@ wake_affine(struct sched_domain *this_sd, struct rq *this_rq,
 	if (!(this_sd->flags & SD_WAKE_AFFINE) || !sched_feat(AFFINE_WAKEUPS))
 		return 0;
 
-	if (!sync && sched_feat(SYNC_WAKEUPS) &&
-	    curr->se.avg_overlap < sysctl_sched_migration_cost &&
-	    p->se.avg_overlap < sysctl_sched_migration_cost)
-		sync = 1;
+	if (sync && (curr->se.avg_overlap > sysctl_sched_migration_cost ||
+			p->se.avg_overlap > sysctl_sched_migration_cost))
+		sync = 0;
 
 	/*
 	 * If sync wakeup then subtract the (maximum possible)
@@ -1225,33 +1293,87 @@ static unsigned long wakeup_gran(struct sched_entity *se)
 	 * More easily preempt - nice tasks, while not making it harder for
 	 * + nice tasks.
 	 */
-	if (sched_feat(ASYM_GRAN))
-		gran = calc_delta_mine(gran, NICE_0_LOAD, &se->load);
+	if (!sched_feat(ASYM_GRAN) || se->load.weight > NICE_0_LOAD)
+		gran = calc_delta_fair(sysctl_sched_wakeup_granularity, se);
 
 	return gran;
 }
 
 /*
+ * Should 'se' preempt 'curr'.
+ *
+ *             |s1
+ *        |s2
+ *   |s3
+ *         g
+ *      |<--->|c
+ *
+ *  w(c, s1) = -1
+ *  w(c, s2) =  0
+ *  w(c, s3) =  1
+ *
+ */
+static int
+wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se)
+{
+	s64 gran, vdiff = curr->vruntime - se->vruntime;
+
+	if (vdiff <= 0)
+		return -1;
+
+	gran = wakeup_gran(curr);
+	if (vdiff > gran)
+		return 1;
+
+	return 0;
+}
+
+static void set_last_buddy(struct sched_entity *se)
+{
+	for_each_sched_entity(se)
+		cfs_rq_of(se)->last = se;
+}
+
+static void set_next_buddy(struct sched_entity *se)
+{
+	for_each_sched_entity(se)
+		cfs_rq_of(se)->next = se;
+}
+
+/*
  * Preempt the current task with a newly woken task if needed:
  */
 static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int sync)
 {
 	struct task_struct *curr = rq->curr;
-	struct cfs_rq *cfs_rq = task_cfs_rq(curr);
 	struct sched_entity *se = &curr->se, *pse = &p->se;
-	s64 delta_exec;
+	struct cfs_rq *cfs_rq = task_cfs_rq(curr);
+
+	update_curr(cfs_rq);
 
 	if (unlikely(rt_prio(p->prio))) {
-		update_rq_clock(rq);
-		update_curr(cfs_rq);
 		resched_task(curr);
 		return;
 	}
 
+	if (unlikely(p->sched_class != &fair_sched_class))
+		return;
+
 	if (unlikely(se == pse))
 		return;
 
-	cfs_rq_of(pse)->next = pse;
+	/*
+	 * Only set the backward buddy when the current task is still on the
+	 * rq. This can happen when a wakeup gets interleaved with schedule on
+	 * the ->pre_schedule() or idle_balance() point, either of which can
+	 * drop the rq lock.
+	 *
+	 * Also, during early boot the idle thread is in the fair class, for
+	 * obvious reasons its a bad idea to schedule back to the idle thread.
+	 */
+	if (sched_feat(LAST_BUDDY) && likely(se->on_rq && curr != rq->idle))
+		set_last_buddy(se);
+	set_next_buddy(pse);
 
 	/*
 	 * We can come here with TIF_NEED_RESCHED already set from new task
@@ -1277,9 +1399,19 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int sync)
 		return;
 	}
 
-	delta_exec = se->sum_exec_runtime - se->prev_sum_exec_runtime;
-	if (delta_exec > wakeup_gran(pse))
-		resched_task(curr);
+	find_matching_se(&se, &pse);
+
+	while (se) {
+		BUG_ON(!pse);
+
+		if (wakeup_preempt_entity(se, pse) == 1) {
+			resched_task(curr);
+			break;
+		}
+
+		se = parent_entity(se);
+		pse = parent_entity(pse);
+	}
 }
 
 static struct task_struct *pick_next_task_fair(struct rq *rq)
@@ -1293,6 +1425,7 @@ static struct task_struct *pick_next_task_fair(struct rq *rq)
 
 	do {
 		se = pick_next_entity(cfs_rq);
+		set_next_entity(cfs_rq, se);
 		cfs_rq = group_cfs_rq(se);
 	} while (cfs_rq);
 
@@ -1575,9 +1708,6 @@ static const struct sched_class fair_sched_class = {
 	.enqueue_task		= enqueue_task_fair,
 	.dequeue_task		= dequeue_task_fair,
 	.yield_task		= yield_task_fair,
-#ifdef CONFIG_SMP
-	.select_task_rq		= select_task_rq_fair,
-#endif /* CONFIG_SMP */
 
 	.check_preempt_curr	= check_preempt_wakeup,
 
@@ -1585,6 +1715,8 @@ static const struct sched_class fair_sched_class = {
 	.put_prev_task		= put_prev_task_fair,
 
 #ifdef CONFIG_SMP
+	.select_task_rq		= select_task_rq_fair,
+
 	.load_balance		= load_balance_fair,
 	.move_one_task		= move_one_task_fair,
 #endif
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index 7c9e8f4a049f..da5d93b5d2c6 100644
--- a/kernel/sched_features.h
+++ b/kernel/sched_features.h
@@ -5,10 +5,11 @@ SCHED_FEAT(START_DEBIT, 1)
 SCHED_FEAT(AFFINE_WAKEUPS, 1)
 SCHED_FEAT(CACHE_HOT_BUDDY, 1)
 SCHED_FEAT(SYNC_WAKEUPS, 1)
-SCHED_FEAT(HRTICK, 1)
+SCHED_FEAT(HRTICK, 0)
 SCHED_FEAT(DOUBLE_TICK, 0)
 SCHED_FEAT(ASYM_GRAN, 1)
 SCHED_FEAT(LB_BIAS, 1)
 SCHED_FEAT(LB_WAKEUP_UPDATE, 1)
 SCHED_FEAT(ASYM_EFF_LOAD, 1)
 SCHED_FEAT(WAKEUP_OVERLAP, 0)
+SCHED_FEAT(LAST_BUDDY, 1)
diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c
index dec4ccabe2f5..8a21a2e28c13 100644
--- a/kernel/sched_idletask.c
+++ b/kernel/sched_idletask.c
@@ -105,9 +105,6 @@ static const struct sched_class idle_sched_class = {
 
 	/* dequeue is not valid, we print a debug message there: */
 	.dequeue_task		= dequeue_task_idle,
-#ifdef CONFIG_SMP
-	.select_task_rq		= select_task_rq_idle,
-#endif /* CONFIG_SMP */
 
 	.check_preempt_curr	= check_preempt_curr_idle,
 
@@ -115,6 +112,8 @@ static const struct sched_class idle_sched_class = {
 	.put_prev_task		= put_prev_task_idle,
 
 #ifdef CONFIG_SMP
+	.select_task_rq		= select_task_rq_idle,
+
 	.load_balance		= load_balance_idle,
 	.move_one_task		= move_one_task_idle,
 #endif
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index cdf5740ab03e..51d2af3e6191 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -77,7 +77,7 @@ static inline u64 sched_rt_period(struct rt_rq *rt_rq)
 }
 
 #define for_each_leaf_rt_rq(rt_rq, rq) \
-	list_for_each_entry(rt_rq, &rq->leaf_rt_rq_list, leaf_rt_rq_list)
+	list_for_each_entry_rcu(rt_rq, &rq->leaf_rt_rq_list, leaf_rt_rq_list)
 
 static inline struct rq *rq_of_rt_rq(struct rt_rq *rt_rq)
 {
@@ -526,6 +526,8 @@ static void update_curr_rt(struct rq *rq)
 	schedstat_set(curr->se.exec_max, max(curr->se.exec_max, delta_exec));
 
 	curr->se.sum_exec_runtime += delta_exec;
+	account_group_exec_runtime(curr, delta_exec);
+
 	curr->se.exec_start = rq->clock;
 	cpuacct_charge(curr, delta_exec);
 
@@ -535,13 +537,13 @@ static void update_curr_rt(struct rq *rq)
 	for_each_sched_rt_entity(rt_se) {
 		rt_rq = rt_rq_of_se(rt_se);
 
-		spin_lock(&rt_rq->rt_runtime_lock);
 		if (sched_rt_runtime(rt_rq) != RUNTIME_INF) {
+			spin_lock(&rt_rq->rt_runtime_lock);
 			rt_rq->rt_time += delta_exec;
 			if (sched_rt_runtime_exceeded(rt_rq))
 				resched_task(curr);
+			spin_unlock(&rt_rq->rt_runtime_lock);
 		}
-		spin_unlock(&rt_rq->rt_runtime_lock);
 	}
 }
 
@@ -907,9 +909,6 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
 /* Only try algorithms three times */
 #define RT_MAX_TRIES 3
 
-static int double_lock_balance(struct rq *this_rq, struct rq *busiest);
-static void double_unlock_balance(struct rq *this_rq, struct rq *busiest);
-
 static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep);
 
 static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
@@ -1458,7 +1457,7 @@ static void watchdog(struct rq *rq, struct task_struct *p)
 		p->rt.timeout++;
 		next = DIV_ROUND_UP(min(soft, hard), USEC_PER_SEC/HZ);
 		if (p->rt.timeout > next)
-			p->it_sched_expires = p->se.sum_exec_runtime;
+			p->cputime_expires.sched_exp = p->se.sum_exec_runtime;
 	}
 }
 
@@ -1502,9 +1501,6 @@ static const struct sched_class rt_sched_class = {
 	.enqueue_task		= enqueue_task_rt,
 	.dequeue_task		= dequeue_task_rt,
 	.yield_task		= yield_task_rt,
-#ifdef CONFIG_SMP
-	.select_task_rq		= select_task_rq_rt,
-#endif /* CONFIG_SMP */
 
 	.check_preempt_curr	= check_preempt_curr_rt,
 
@@ -1512,6 +1508,8 @@ static const struct sched_class rt_sched_class = {
 	.put_prev_task		= put_prev_task_rt,
 
 #ifdef CONFIG_SMP
+	.select_task_rq		= select_task_rq_rt,
+
 	.load_balance		= load_balance_rt,
 	.move_one_task		= move_one_task_rt,
 	.set_cpus_allowed       = set_cpus_allowed_rt,
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index 8385d43987e2..3b01098164c8 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -9,7 +9,7 @@
 static int show_schedstat(struct seq_file *seq, void *v)
 {
 	int cpu;
-	int mask_len = NR_CPUS/32 * 9;
+	int mask_len = DIV_ROUND_UP(NR_CPUS, 32) * 9;
 	char *mask_str = kmalloc(mask_len, GFP_KERNEL);
 
 	if (mask_str == NULL)
@@ -31,7 +31,7 @@ static int show_schedstat(struct seq_file *seq, void *v)
 		    rq->yld_act_empty, rq->yld_exp_empty, rq->yld_count,
 		    rq->sched_switch, rq->sched_count, rq->sched_goidle,
 		    rq->ttwu_count, rq->ttwu_local,
-		    rq->rq_sched_info.cpu_time,
+		    rq->rq_cpu_time,
 		    rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
 
 		seq_printf(seq, "\n");
@@ -90,13 +90,20 @@ static int schedstat_open(struct inode *inode, struct file *file)
 	return res;
 }
 
-const struct file_operations proc_schedstat_operations = {
+static const struct file_operations proc_schedstat_operations = {
 	.open    = schedstat_open,
 	.read    = seq_read,
 	.llseek  = seq_lseek,
 	.release = single_release,
 };
 
+static int __init proc_schedstat_init(void)
+{
+	proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
+	return 0;
+}
+module_init(proc_schedstat_init);
+
 /*
  * Expects runqueue lock to be held for atomicity of update
  */
@@ -116,7 +123,7 @@ static inline void
 rq_sched_info_depart(struct rq *rq, unsigned long long delta)
 {
 	if (rq)
-		rq->rq_sched_info.cpu_time += delta;
+		rq->rq_cpu_time += delta;
 }
 
 static inline void
@@ -229,7 +236,6 @@ static inline void sched_info_depart(struct task_struct *t)
 	unsigned long long delta = task_rq(t)->clock -
 					t->sched_info.last_arrival;
 
-	t->sched_info.cpu_time += delta;
 	rq_sched_info_depart(task_rq(t), delta);
 
 	if (t->state == TASK_RUNNING)
@@ -270,3 +276,96 @@ sched_info_switch(struct task_struct *prev, struct task_struct *next)
 #define sched_info_switch(t, next)		do { } while (0)
 #endif /* CONFIG_SCHEDSTATS || CONFIG_TASK_DELAY_ACCT */
 
+/*
+ * The following are functions that support scheduler-internal time accounting.
+ * These functions are generally called at the timer tick.  None of this depends
+ * on CONFIG_SCHEDSTATS.
+ */
+
+/**
+ * account_group_user_time - Maintain utime for a thread group.
+ *
+ * @tsk:	Pointer to task structure.
+ * @cputime:	Time value by which to increment the utime field of the
+ *		thread_group_cputime structure.
+ *
+ * If thread group time is being maintained, get the structure for the
+ * running CPU and update the utime field there.
+ */
+static inline void account_group_user_time(struct task_struct *tsk,
+					   cputime_t cputime)
+{
+	struct signal_struct *sig;
+
+	/* tsk == current, ensure it is safe to use ->signal */
+	if (unlikely(tsk->exit_state))
+		return;
+
+	sig = tsk->signal;
+	if (sig->cputime.totals) {
+		struct task_cputime *times;
+
+		times = per_cpu_ptr(sig->cputime.totals, get_cpu());
+		times->utime = cputime_add(times->utime, cputime);
+		put_cpu_no_resched();
+	}
+}
+
+/**
+ * account_group_system_time - Maintain stime for a thread group.
+ *
+ * @tsk:	Pointer to task structure.
+ * @cputime:	Time value by which to increment the stime field of the
+ *		thread_group_cputime structure.
+ *
+ * If thread group time is being maintained, get the structure for the
+ * running CPU and update the stime field there.
+ */
+static inline void account_group_system_time(struct task_struct *tsk,
+					     cputime_t cputime)
+{
+	struct signal_struct *sig;
+
+	/* tsk == current, ensure it is safe to use ->signal */
+	if (unlikely(tsk->exit_state))
+		return;
+
+	sig = tsk->signal;
+	if (sig->cputime.totals) {
+		struct task_cputime *times;
+
+		times = per_cpu_ptr(sig->cputime.totals, get_cpu());
+		times->stime = cputime_add(times->stime, cputime);
+		put_cpu_no_resched();
+	}
+}
+
+/**
+ * account_group_exec_runtime - Maintain exec runtime for a thread group.
+ *
+ * @tsk:	Pointer to task structure.
+ * @ns:		Time value by which to increment the sum_exec_runtime field
+ *		of the thread_group_cputime structure.
+ *
+ * If thread group time is being maintained, get the structure for the
+ * running CPU and update the sum_exec_runtime field there.
+ */
+static inline void account_group_exec_runtime(struct task_struct *tsk,
+					      unsigned long long ns)
+{
+	struct signal_struct *sig;
+
+	sig = tsk->signal;
+	/* see __exit_signal()->task_rq_unlock_wait() */
+	barrier();
+	if (unlikely(!sig))
+		return;
+
+	if (sig->cputime.totals) {
+		struct task_cputime *times;
+
+		times = per_cpu_ptr(sig->cputime.totals, get_cpu());
+		times->sum_exec_runtime += ns;
+		put_cpu_no_resched();
+	}
+}
diff --git a/kernel/signal.c b/kernel/signal.c
index e661b01d340f..8e95855ff3cf 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -27,6 +27,7 @@
 #include <linux/freezer.h>
 #include <linux/pid_namespace.h>
 #include <linux/nsproxy.h>
+#include <trace/sched.h>
 
 #include <asm/param.h>
 #include <asm/uaccess.h>
@@ -40,6 +41,8 @@
 
 static struct kmem_cache *sigqueue_cachep;
 
+DEFINE_TRACE(sched_signal_send);
+
 static void __user *sig_handler(struct task_struct *t, int sig)
 {
 	return t->sighand->action[sig - 1].sa.sa_handler;
@@ -176,6 +179,11 @@ int next_signal(struct sigpending *pending, sigset_t *mask)
 	return sig;
 }
 
+/*
+ * allocate a new signal queue record
+ * - this may be called without locks if and only if t == current, otherwise an
+ *   appopriate lock must be held to stop the target task from exiting
+ */
 static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
 					 int override_rlimit)
 {
@@ -183,11 +191,12 @@ static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
 	struct user_struct *user;
 
 	/*
-	 * In order to avoid problems with "switch_user()", we want to make
-	 * sure that the compiler doesn't re-load "t->user"
+	 * We won't get problems with the target's UID changing under us
+	 * because changing it requires RCU be used, and if t != current, the
+	 * caller must be holding the RCU readlock (by way of a spinlock) and
+	 * we use RCU protection here
 	 */
-	user = t->user;
-	barrier();
+	user = get_uid(__task_cred(t)->user);
 	atomic_inc(&user->sigpending);
 	if (override_rlimit ||
 	    atomic_read(&user->sigpending) <=
@@ -195,12 +204,14 @@ static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
 		q = kmem_cache_alloc(sigqueue_cachep, flags);
 	if (unlikely(q == NULL)) {
 		atomic_dec(&user->sigpending);
+		free_uid(user);
 	} else {
 		INIT_LIST_HEAD(&q->list);
 		q->flags = 0;
-		q->user = get_uid(user);
+		q->user = user;
 	}
-	return(q);
+
+	return q;
 }
 
 static void __sigqueue_free(struct sigqueue *q)
@@ -561,10 +572,12 @@ static int rm_from_queue(unsigned long mask, struct sigpending *s)
 
 /*
  * Bad permissions for sending the signal
+ * - the caller must hold at least the RCU read lock
  */
 static int check_kill_permission(int sig, struct siginfo *info,
 				 struct task_struct *t)
 {
+	const struct cred *cred = current_cred(), *tcred;
 	struct pid *sid;
 	int error;
 
@@ -578,8 +591,11 @@ static int check_kill_permission(int sig, struct siginfo *info,
 	if (error)
 		return error;
 
-	if ((current->euid ^ t->suid) && (current->euid ^ t->uid) &&
-	    (current->uid  ^ t->suid) && (current->uid  ^ t->uid) &&
+	tcred = __task_cred(t);
+	if ((cred->euid ^ tcred->suid) &&
+	    (cred->euid ^ tcred->uid) &&
+	    (cred->uid  ^ tcred->suid) &&
+	    (cred->uid  ^ tcred->uid) &&
 	    !capable(CAP_KILL)) {
 		switch (sig) {
 		case SIGCONT:
@@ -803,6 +819,8 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
 	struct sigpending *pending;
 	struct sigqueue *q;
 
+	trace_sched_signal_send(sig, t);
+
 	assert_spin_locked(&t->sighand->siglock);
 	if (!prepare_signal(sig, t))
 		return 0;
@@ -841,7 +859,7 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
 			q->info.si_errno = 0;
 			q->info.si_code = SI_USER;
 			q->info.si_pid = task_pid_vnr(current);
-			q->info.si_uid = current->uid;
+			q->info.si_uid = current_uid();
 			break;
 		case (unsigned long) SEND_SIG_PRIV:
 			q->info.si_signo = sig;
@@ -1005,6 +1023,10 @@ struct sighand_struct *lock_task_sighand(struct task_struct *tsk, unsigned long
 	return sighand;
 }
 
+/*
+ * send signal info to all the members of a group
+ * - the caller must hold the RCU read lock at least
+ */
 int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
 {
 	unsigned long flags;
@@ -1026,8 +1048,8 @@ int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
 /*
  * __kill_pgrp_info() sends a signal to a process group: this is what the tty
  * control characters do (^C, ^Z etc)
+ * - the caller must hold at least a readlock on tasklist_lock
  */
-
 int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp)
 {
 	struct task_struct *p = NULL;
@@ -1083,6 +1105,7 @@ int kill_pid_info_as_uid(int sig, struct siginfo *info, struct pid *pid,
 {
 	int ret = -EINVAL;
 	struct task_struct *p;
+	const struct cred *pcred;
 
 	if (!valid_signal(sig))
 		return ret;
@@ -1093,9 +1116,11 @@ int kill_pid_info_as_uid(int sig, struct siginfo *info, struct pid *pid,
 		ret = -ESRCH;
 		goto out_unlock;
 	}
-	if ((info == SEND_SIG_NOINFO || (!is_si_special(info) && SI_FROMUSER(info)))
-	    && (euid != p->suid) && (euid != p->uid)
-	    && (uid != p->suid) && (uid != p->uid)) {
+	pcred = __task_cred(p);
+	if ((info == SEND_SIG_NOINFO ||
+	     (!is_si_special(info) && SI_FROMUSER(info))) &&
+	    euid != pcred->suid && euid != pcred->uid &&
+	    uid  != pcred->suid && uid  != pcred->uid) {
 		ret = -EPERM;
 		goto out_unlock;
 	}
@@ -1141,7 +1166,8 @@ static int kill_something_info(int sig, struct siginfo *info, pid_t pid)
 		struct task_struct * p;
 
 		for_each_process(p) {
-			if (p->pid > 1 && !same_thread_group(p, current)) {
+			if (task_pid_vnr(p) > 1 &&
+					!same_thread_group(p, current)) {
 				int err = group_send_sig_info(sig, info, p);
 				++count;
 				if (err != -EPERM)
@@ -1338,6 +1364,7 @@ int do_notify_parent(struct task_struct *tsk, int sig)
 	struct siginfo info;
 	unsigned long flags;
 	struct sighand_struct *psig;
+	struct task_cputime cputime;
 	int ret = sig;
 
 	BUG_ON(sig == -1);
@@ -1364,14 +1391,12 @@ int do_notify_parent(struct task_struct *tsk, int sig)
 	 */
 	rcu_read_lock();
 	info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns);
+	info.si_uid = __task_cred(tsk)->uid;
 	rcu_read_unlock();
 
-	info.si_uid = tsk->uid;
-
-	info.si_utime = cputime_to_clock_t(cputime_add(tsk->utime,
-						       tsk->signal->utime));
-	info.si_stime = cputime_to_clock_t(cputime_add(tsk->stime,
-						       tsk->signal->stime));
+	thread_group_cputime(tsk, &cputime);
+	info.si_utime = cputime_to_jiffies(cputime.utime);
+	info.si_stime = cputime_to_jiffies(cputime.stime);
 
 	info.si_status = tsk->exit_code & 0x7f;
 	if (tsk->exit_code & 0x80)
@@ -1436,10 +1461,9 @@ static void do_notify_parent_cldstop(struct task_struct *tsk, int why)
 	 */
 	rcu_read_lock();
 	info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns);
+	info.si_uid = __task_cred(tsk)->uid;
 	rcu_read_unlock();
 
-	info.si_uid = tsk->uid;
-
 	info.si_utime = cputime_to_clock_t(tsk->utime);
 	info.si_stime = cputime_to_clock_t(tsk->stime);
 
@@ -1594,7 +1618,7 @@ void ptrace_notify(int exit_code)
 	info.si_signo = SIGTRAP;
 	info.si_code = exit_code;
 	info.si_pid = task_pid_vnr(current);
-	info.si_uid = current->uid;
+	info.si_uid = current_uid();
 
 	/* Let the debugger run.  */
 	spin_lock_irq(&current->sighand->siglock);
@@ -1706,7 +1730,7 @@ static int ptrace_signal(int signr, siginfo_t *info,
 		info->si_errno = 0;
 		info->si_code = SI_USER;
 		info->si_pid = task_pid_vnr(current->parent);
-		info->si_uid = current->parent->uid;
+		info->si_uid = task_uid(current->parent);
 	}
 
 	/* If the (new) signal is now blocked, requeue it.  */
@@ -2207,7 +2231,7 @@ sys_kill(pid_t pid, int sig)
 	info.si_errno = 0;
 	info.si_code = SI_USER;
 	info.si_pid = task_tgid_vnr(current);
-	info.si_uid = current->uid;
+	info.si_uid = current_uid();
 
 	return kill_something_info(sig, &info, pid);
 }
@@ -2224,7 +2248,7 @@ static int do_tkill(pid_t tgid, pid_t pid, int sig)
 	info.si_errno = 0;
 	info.si_code = SI_TKILL;
 	info.si_pid = task_tgid_vnr(current);
-	info.si_uid = current->uid;
+	info.si_uid = current_uid();
 
 	rcu_read_lock();
 	p = find_task_by_vpid(pid);
diff --git a/kernel/smp.c b/kernel/smp.c
index f362a8553777..75c8dde58c55 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -51,10 +51,6 @@ static void csd_flag_wait(struct call_single_data *data)
 {
 	/* Wait for response */
 	do {
-		/*
-		 * We need to see the flags store in the IPI handler
-		 */
-		smp_mb();
 		if (!(data->flags & CSD_FLAG_WAIT))
 			break;
 		cpu_relax();
@@ -76,6 +72,11 @@ static void generic_exec_single(int cpu, struct call_single_data *data)
 	list_add_tail(&data->list, &dst->list);
 	spin_unlock_irqrestore(&dst->lock, flags);
 
+	/*
+	 * Make the list addition visible before sending the ipi.
+	 */
+	smp_mb();
+
 	if (ipi)
 		arch_send_call_function_single_ipi(cpu);
 
@@ -157,7 +158,7 @@ void generic_smp_call_function_single_interrupt(void)
 	 * Need to see other stores to list head for checking whether
 	 * list is empty without holding q->lock
 	 */
-	smp_mb();
+	smp_read_barrier_depends();
 	while (!list_empty(&q->list)) {
 		unsigned int data_flags;
 
@@ -191,7 +192,7 @@ void generic_smp_call_function_single_interrupt(void)
 		/*
 		 * See comment on outer loop
 		 */
-		smp_mb();
+		smp_read_barrier_depends();
 	}
 }
 
@@ -370,6 +371,11 @@ int smp_call_function_mask(cpumask_t mask, void (*func)(void *), void *info,
 	list_add_tail_rcu(&data->csd.list, &call_function_queue);
 	spin_unlock_irqrestore(&call_function_lock, flags);
 
+	/*
+	 * Make the list addition visible before sending the ipi.
+	 */
+	smp_mb();
+
 	/* Send a message to all CPUs in the map */
 	arch_send_call_function_ipi(mask);
 
diff --git a/kernel/softirq.c b/kernel/softirq.c
index c506f266a6b9..466e75ce271a 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -6,6 +6,8 @@
  *	Distribute under GPLv2.
  *
  *	Rewritten. Old one was good in 2.2, but in 2.3 it was immoral. --ANK (990903)
+ *
+ *	Remote softirq infrastructure is by Jens Axboe.
  */
 
 #include <linux/module.h>
@@ -46,7 +48,7 @@ irq_cpustat_t irq_stat[NR_CPUS] ____cacheline_aligned;
 EXPORT_SYMBOL(irq_stat);
 #endif
 
-static struct softirq_action softirq_vec[32] __cacheline_aligned_in_smp;
+static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp;
 
 static DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
 
@@ -100,20 +102,6 @@ void local_bh_disable(void)
 
 EXPORT_SYMBOL(local_bh_disable);
 
-void __local_bh_enable(void)
-{
-	WARN_ON_ONCE(in_irq());
-
-	/*
-	 * softirqs should never be enabled by __local_bh_enable(),
-	 * it always nests inside local_bh_enable() sections:
-	 */
-	WARN_ON_ONCE(softirq_count() == SOFTIRQ_OFFSET);
-
-	sub_preempt_count(SOFTIRQ_OFFSET);
-}
-EXPORT_SYMBOL_GPL(__local_bh_enable);
-
 /*
  * Special-case - softirqs can safely be enabled in
  * cond_resched_softirq(), or by __do_softirq(),
@@ -205,7 +193,18 @@ restart:
 
 	do {
 		if (pending & 1) {
+			int prev_count = preempt_count();
+
 			h->action(h);
+
+			if (unlikely(prev_count != preempt_count())) {
+				printk(KERN_ERR "huh, entered softirq %td %p"
+				       "with preempt_count %08x,"
+				       " exited with %08x?\n", h - softirq_vec,
+				       h->action, prev_count, preempt_count());
+				preempt_count() = prev_count;
+			}
+
 			rcu_bh_qsctr_inc(cpu);
 		}
 		h++;
@@ -254,16 +253,14 @@ asmlinkage void do_softirq(void)
  */
 void irq_enter(void)
 {
-#ifdef CONFIG_NO_HZ
 	int cpu = smp_processor_id();
-	if (idle_cpu(cpu) && !in_interrupt())
-		tick_nohz_stop_idle(cpu);
-#endif
-	__irq_enter();
-#ifdef CONFIG_NO_HZ
-	if (idle_cpu(cpu))
-		tick_nohz_update_jiffies();
-#endif
+
+	rcu_irq_enter();
+	if (idle_cpu(cpu) && !in_interrupt()) {
+		__irq_enter();
+		tick_check_idle(cpu);
+	} else
+		__irq_enter();
 }
 
 #ifdef __ARCH_IRQ_EXIT_IRQS_DISABLED
@@ -285,9 +282,9 @@ void irq_exit(void)
 
 #ifdef CONFIG_NO_HZ
 	/* Make sure that timer wheel updates are propagated */
-	if (!in_interrupt() && idle_cpu(smp_processor_id()) && !need_resched())
-		tick_nohz_stop_sched_tick(0);
 	rcu_irq_exit();
+	if (idle_cpu(smp_processor_id()) && !in_interrupt() && !need_resched())
+		tick_nohz_stop_sched_tick(0);
 #endif
 	preempt_enable_no_resched();
 }
@@ -463,17 +460,144 @@ void tasklet_kill(struct tasklet_struct *t)
 
 EXPORT_SYMBOL(tasklet_kill);
 
+DEFINE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
+EXPORT_PER_CPU_SYMBOL(softirq_work_list);
+
+static void __local_trigger(struct call_single_data *cp, int softirq)
+{
+	struct list_head *head = &__get_cpu_var(softirq_work_list[softirq]);
+
+	list_add_tail(&cp->list, head);
+
+	/* Trigger the softirq only if the list was previously empty.  */
+	if (head->next == &cp->list)
+		raise_softirq_irqoff(softirq);
+}
+
+#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
+static void remote_softirq_receive(void *data)
+{
+	struct call_single_data *cp = data;
+	unsigned long flags;
+	int softirq;
+
+	softirq = cp->priv;
+
+	local_irq_save(flags);
+	__local_trigger(cp, softirq);
+	local_irq_restore(flags);
+}
+
+static int __try_remote_softirq(struct call_single_data *cp, int cpu, int softirq)
+{
+	if (cpu_online(cpu)) {
+		cp->func = remote_softirq_receive;
+		cp->info = cp;
+		cp->flags = 0;
+		cp->priv = softirq;
+
+		__smp_call_function_single(cpu, cp);
+		return 0;
+	}
+	return 1;
+}
+#else /* CONFIG_USE_GENERIC_SMP_HELPERS */
+static int __try_remote_softirq(struct call_single_data *cp, int cpu, int softirq)
+{
+	return 1;
+}
+#endif
+
+/**
+ * __send_remote_softirq - try to schedule softirq work on a remote cpu
+ * @cp: private SMP call function data area
+ * @cpu: the remote cpu
+ * @this_cpu: the currently executing cpu
+ * @softirq: the softirq for the work
+ *
+ * Attempt to schedule softirq work on a remote cpu.  If this cannot be
+ * done, the work is instead queued up on the local cpu.
+ *
+ * Interrupts must be disabled.
+ */
+void __send_remote_softirq(struct call_single_data *cp, int cpu, int this_cpu, int softirq)
+{
+	if (cpu == this_cpu || __try_remote_softirq(cp, cpu, softirq))
+		__local_trigger(cp, softirq);
+}
+EXPORT_SYMBOL(__send_remote_softirq);
+
+/**
+ * send_remote_softirq - try to schedule softirq work on a remote cpu
+ * @cp: private SMP call function data area
+ * @cpu: the remote cpu
+ * @softirq: the softirq for the work
+ *
+ * Like __send_remote_softirq except that disabling interrupts and
+ * computing the current cpu is done for the caller.
+ */
+void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq)
+{
+	unsigned long flags;
+	int this_cpu;
+
+	local_irq_save(flags);
+	this_cpu = smp_processor_id();
+	__send_remote_softirq(cp, cpu, this_cpu, softirq);
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(send_remote_softirq);
+
+static int __cpuinit remote_softirq_cpu_notify(struct notifier_block *self,
+					       unsigned long action, void *hcpu)
+{
+	/*
+	 * If a CPU goes away, splice its entries to the current CPU
+	 * and trigger a run of the softirq
+	 */
+	if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
+		int cpu = (unsigned long) hcpu;
+		int i;
+
+		local_irq_disable();
+		for (i = 0; i < NR_SOFTIRQS; i++) {
+			struct list_head *head = &per_cpu(softirq_work_list[i], cpu);
+			struct list_head *local_head;
+
+			if (list_empty(head))
+				continue;
+
+			local_head = &__get_cpu_var(softirq_work_list[i]);
+			list_splice_init(head, local_head);
+			raise_softirq_irqoff(i);
+		}
+		local_irq_enable();
+	}
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata remote_softirq_cpu_notifier = {
+	.notifier_call	= remote_softirq_cpu_notify,
+};
+
 void __init softirq_init(void)
 {
 	int cpu;
 
 	for_each_possible_cpu(cpu) {
+		int i;
+
 		per_cpu(tasklet_vec, cpu).tail =
 			&per_cpu(tasklet_vec, cpu).head;
 		per_cpu(tasklet_hi_vec, cpu).tail =
 			&per_cpu(tasklet_hi_vec, cpu).head;
+		for (i = 0; i < NR_SOFTIRQS; i++)
+			INIT_LIST_HEAD(&per_cpu(softirq_work_list[i], cpu));
 	}
 
+	register_hotcpu_notifier(&remote_softirq_cpu_notifier);
+
 	open_softirq(TASKLET_SOFTIRQ, tasklet_action);
 	open_softirq(HI_SOFTIRQ, tasklet_hi_action);
 }
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index cb838ee93a82..1ab790c67b17 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -164,7 +164,7 @@ unsigned long __read_mostly sysctl_hung_task_check_count = 1024;
 /*
  * Zero means infinite timeout - no checking done:
  */
-unsigned long __read_mostly sysctl_hung_task_timeout_secs = 120;
+unsigned long __read_mostly sysctl_hung_task_timeout_secs = 480;
 
 unsigned long __read_mostly sysctl_hung_task_warnings = 10;
 
@@ -188,7 +188,7 @@ static void check_hung_task(struct task_struct *t, unsigned long now)
 	if ((long)(now - t->last_switch_timestamp) <
 					sysctl_hung_task_timeout_secs)
 		return;
-	if (sysctl_hung_task_warnings < 0)
+	if (!sysctl_hung_task_warnings)
 		return;
 	sysctl_hung_task_warnings--;
 
@@ -226,7 +226,7 @@ static void check_hung_uninterruptible_tasks(int this_cpu)
 	 * If the system crashed already then all bets are off,
 	 * do not report extra hung tasks:
 	 */
-	if ((tainted & TAINT_DIE) || did_panic)
+	if (test_taint(TAINT_DIE) || did_panic)
 		return;
 
 	read_lock(&tasklist_lock);
diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c
index 94b527ef1d1e..eb212f8f8bc8 100644
--- a/kernel/stacktrace.c
+++ b/kernel/stacktrace.c
@@ -6,6 +6,7 @@
  *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
  */
 #include <linux/sched.h>
+#include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/kallsyms.h>
 #include <linux/stacktrace.h>
@@ -24,3 +25,13 @@ void print_stack_trace(struct stack_trace *trace, int spaces)
 }
 EXPORT_SYMBOL_GPL(print_stack_trace);
 
+/*
+ * Architectures that do not implement save_stack_trace_tsk get this
+ * weak alias and a once-per-bootup warning (whenever this facility
+ * is utilized - for example by procfs):
+ */
+__weak void
+save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+	WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n");
+}
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index af3c7cea258b..24e8ceacc388 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -37,9 +37,13 @@ struct stop_machine_data {
 /* Like num_online_cpus(), but hotplug cpu uses us, so we need this. */
 static unsigned int num_threads;
 static atomic_t thread_ack;
-static struct completion finished;
 static DEFINE_MUTEX(lock);
 
+static struct workqueue_struct *stop_machine_wq;
+static struct stop_machine_data active, idle;
+static const cpumask_t *active_cpus;
+static void *stop_machine_work;
+
 static void set_state(enum stopmachine_state newstate)
 {
 	/* Reset ack counter. */
@@ -51,21 +55,26 @@ static void set_state(enum stopmachine_state newstate)
 /* Last one to ack a state moves to the next state. */
 static void ack_state(void)
 {
-	if (atomic_dec_and_test(&thread_ack)) {
-		/* If we're the last one to ack the EXIT, we're finished. */
-		if (state == STOPMACHINE_EXIT)
-			complete(&finished);
-		else
-			set_state(state + 1);
-	}
+	if (atomic_dec_and_test(&thread_ack))
+		set_state(state + 1);
 }
 
-/* This is the actual thread which stops the CPU.  It exits by itself rather
- * than waiting for kthread_stop(), because it's easier for hotplug CPU. */
-static int stop_cpu(struct stop_machine_data *smdata)
+/* This is the actual function which stops the CPU. It runs
+ * in the context of a dedicated stopmachine workqueue. */
+static void stop_cpu(struct work_struct *unused)
 {
 	enum stopmachine_state curstate = STOPMACHINE_NONE;
-
+	struct stop_machine_data *smdata = &idle;
+	int cpu = smp_processor_id();
+	int err;
+
+	if (!active_cpus) {
+		if (cpu == first_cpu(cpu_online_map))
+			smdata = &active;
+	} else {
+		if (cpu_isset(cpu, *active_cpus))
+			smdata = &active;
+	}
 	/* Simple state machine */
 	do {
 		/* Chill out and ensure we re-read stopmachine_state. */
@@ -78,9 +87,11 @@ static int stop_cpu(struct stop_machine_data *smdata)
 				hard_irq_disable();
 				break;
 			case STOPMACHINE_RUN:
-				/* |= allows error detection if functions on
-				 * multiple CPUs. */
-				smdata->fnret |= smdata->fn(smdata->data);
+				/* On multiple CPUs only a single error code
+				 * is needed to tell that something failed. */
+				err = smdata->fn(smdata->data);
+				if (err)
+					smdata->fnret = err;
 				break;
 			default:
 				break;
@@ -90,7 +101,6 @@ static int stop_cpu(struct stop_machine_data *smdata)
 	} while (curstate != STOPMACHINE_EXIT);
 
 	local_irq_enable();
-	do_exit(0);
 }
 
 /* Callback for CPUs which aren't supposed to do anything. */
@@ -101,78 +111,35 @@ static int chill(void *unused)
 
 int __stop_machine(int (*fn)(void *), void *data, const cpumask_t *cpus)
 {
-	int i, err;
-	struct stop_machine_data active, idle;
-	struct task_struct **threads;
+	struct work_struct *sm_work;
+	int i, ret;
 
+	/* Set up initial state. */
+	mutex_lock(&lock);
+	num_threads = num_online_cpus();
+	active_cpus = cpus;
 	active.fn = fn;
 	active.data = data;
 	active.fnret = 0;
 	idle.fn = chill;
 	idle.data = NULL;
 
-	/* This could be too big for stack on large machines. */
-	threads = kcalloc(NR_CPUS, sizeof(threads[0]), GFP_KERNEL);
-	if (!threads)
-		return -ENOMEM;
-
-	/* Set up initial state. */
-	mutex_lock(&lock);
-	init_completion(&finished);
-	num_threads = num_online_cpus();
 	set_state(STOPMACHINE_PREPARE);
 
-	for_each_online_cpu(i) {
-		struct stop_machine_data *smdata = &idle;
-		struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
-
-		if (!cpus) {
-			if (i == first_cpu(cpu_online_map))
-				smdata = &active;
-		} else {
-			if (cpu_isset(i, *cpus))
-				smdata = &active;
-		}
-
-		threads[i] = kthread_create((void *)stop_cpu, smdata, "kstop%u",
-					    i);
-		if (IS_ERR(threads[i])) {
-			err = PTR_ERR(threads[i]);
-			threads[i] = NULL;
-			goto kill_threads;
-		}
-
-		/* Place it onto correct cpu. */
-		kthread_bind(threads[i], i);
-
-		/* Make it highest prio. */
-		if (sched_setscheduler_nocheck(threads[i], SCHED_FIFO, &param))
-			BUG();
-	}
-
-	/* We've created all the threads.  Wake them all: hold this CPU so one
+	/* Schedule the stop_cpu work on all cpus: hold this CPU so one
 	 * doesn't hit this CPU until we're ready. */
 	get_cpu();
-	for_each_online_cpu(i)
-		wake_up_process(threads[i]);
-
+	for_each_online_cpu(i) {
+		sm_work = percpu_ptr(stop_machine_work, i);
+		INIT_WORK(sm_work, stop_cpu);
+		queue_work_on(i, stop_machine_wq, sm_work);
+	}
 	/* This will release the thread on our CPU. */
 	put_cpu();
-	wait_for_completion(&finished);
-	mutex_unlock(&lock);
-
-	kfree(threads);
-
-	return active.fnret;
-
-kill_threads:
-	for_each_online_cpu(i)
-		if (threads[i])
-			kthread_stop(threads[i]);
+	flush_workqueue(stop_machine_wq);
+	ret = active.fnret;
 	mutex_unlock(&lock);
-
-	kfree(threads);
-	return err;
+	return ret;
 }
 
 int stop_machine(int (*fn)(void *), void *data, const cpumask_t *cpus)
@@ -187,3 +154,11 @@ int stop_machine(int (*fn)(void *), void *data, const cpumask_t *cpus)
 	return ret;
 }
 EXPORT_SYMBOL_GPL(stop_machine);
+
+static int __init stop_machine_init(void)
+{
+	stop_machine_wq = create_rt_workqueue("kstop");
+	stop_machine_work = alloc_percpu(struct work_struct);
+	return 0;
+}
+core_initcall(stop_machine_init);
diff --git a/kernel/sys.c b/kernel/sys.c
index 234d9454294e..d356d79e84ac 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -112,12 +112,17 @@ EXPORT_SYMBOL(cad_pid);
 
 void (*pm_power_off_prepare)(void);
 
+/*
+ * set the priority of a task
+ * - the caller must hold the RCU read lock
+ */
 static int set_one_prio(struct task_struct *p, int niceval, int error)
 {
+	const struct cred *cred = current_cred(), *pcred = __task_cred(p);
 	int no_nice;
 
-	if (p->uid != current->euid &&
-		p->euid != current->euid && !capable(CAP_SYS_NICE)) {
+	if (pcred->uid  != cred->euid &&
+	    pcred->euid != cred->euid && !capable(CAP_SYS_NICE)) {
 		error = -EPERM;
 		goto out;
 	}
@@ -141,6 +146,7 @@ asmlinkage long sys_setpriority(int which, int who, int niceval)
 {
 	struct task_struct *g, *p;
 	struct user_struct *user;
+	const struct cred *cred = current_cred();
 	int error = -EINVAL;
 	struct pid *pgrp;
 
@@ -174,18 +180,18 @@ asmlinkage long sys_setpriority(int which, int who, int niceval)
 			} while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
 			break;
 		case PRIO_USER:
-			user = current->user;
+			user = (struct user_struct *) cred->user;
 			if (!who)
-				who = current->uid;
-			else
-				if ((who != current->uid) && !(user = find_user(who)))
-					goto out_unlock;	/* No processes for this user */
+				who = cred->uid;
+			else if ((who != cred->uid) &&
+				 !(user = find_user(who)))
+				goto out_unlock;	/* No processes for this user */
 
 			do_each_thread(g, p)
-				if (p->uid == who)
+				if (__task_cred(p)->uid == who)
 					error = set_one_prio(p, niceval, error);
 			while_each_thread(g, p);
-			if (who != current->uid)
+			if (who != cred->uid)
 				free_uid(user);		/* For find_user() */
 			break;
 	}
@@ -205,6 +211,7 @@ asmlinkage long sys_getpriority(int which, int who)
 {
 	struct task_struct *g, *p;
 	struct user_struct *user;
+	const struct cred *cred = current_cred();
 	long niceval, retval = -ESRCH;
 	struct pid *pgrp;
 
@@ -236,21 +243,21 @@ asmlinkage long sys_getpriority(int which, int who)
 			} while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
 			break;
 		case PRIO_USER:
-			user = current->user;
+			user = (struct user_struct *) cred->user;
 			if (!who)
-				who = current->uid;
-			else
-				if ((who != current->uid) && !(user = find_user(who)))
-					goto out_unlock;	/* No processes for this user */
+				who = cred->uid;
+			else if ((who != cred->uid) &&
+				 !(user = find_user(who)))
+				goto out_unlock;	/* No processes for this user */
 
 			do_each_thread(g, p)
-				if (p->uid == who) {
+				if (__task_cred(p)->uid == who) {
 					niceval = 20 - task_nice(p);
 					if (niceval > retval)
 						retval = niceval;
 				}
 			while_each_thread(g, p);
-			if (who != current->uid)
+			if (who != cred->uid)
 				free_uid(user);		/* for find_user() */
 			break;
 	}
@@ -472,46 +479,48 @@ void ctrl_alt_del(void)
  */
 asmlinkage long sys_setregid(gid_t rgid, gid_t egid)
 {
-	int old_rgid = current->gid;
-	int old_egid = current->egid;
-	int new_rgid = old_rgid;
-	int new_egid = old_egid;
+	const struct cred *old;
+	struct cred *new;
 	int retval;
 
+	new = prepare_creds();
+	if (!new)
+		return -ENOMEM;
+	old = current_cred();
+
 	retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE);
 	if (retval)
-		return retval;
+		goto error;
 
+	retval = -EPERM;
 	if (rgid != (gid_t) -1) {
-		if ((old_rgid == rgid) ||
-		    (current->egid==rgid) ||
+		if (old->gid == rgid ||
+		    old->egid == rgid ||
 		    capable(CAP_SETGID))
-			new_rgid = rgid;
+			new->gid = rgid;
 		else
-			return -EPERM;
+			goto error;
 	}
 	if (egid != (gid_t) -1) {
-		if ((old_rgid == egid) ||
-		    (current->egid == egid) ||
-		    (current->sgid == egid) ||
+		if (old->gid == egid ||
+		    old->egid == egid ||
+		    old->sgid == egid ||
 		    capable(CAP_SETGID))
-			new_egid = egid;
+			new->egid = egid;
 		else
-			return -EPERM;
-	}
-	if (new_egid != old_egid) {
-		set_dumpable(current->mm, suid_dumpable);
-		smp_wmb();
+			goto error;
 	}
+
 	if (rgid != (gid_t) -1 ||
-	    (egid != (gid_t) -1 && egid != old_rgid))
-		current->sgid = new_egid;
-	current->fsgid = new_egid;
-	current->egid = new_egid;
-	current->gid = new_rgid;
-	key_fsgid_changed(current);
-	proc_id_connector(current, PROC_EVENT_GID);
-	return 0;
+	    (egid != (gid_t) -1 && egid != old->gid))
+		new->sgid = new->egid;
+	new->fsgid = new->egid;
+
+	return commit_creds(new);
+
+error:
+	abort_creds(new);
+	return retval;
 }
 
 /*
@@ -521,56 +530,54 @@ asmlinkage long sys_setregid(gid_t rgid, gid_t egid)
  */
 asmlinkage long sys_setgid(gid_t gid)
 {
-	int old_egid = current->egid;
+	const struct cred *old;
+	struct cred *new;
 	int retval;
 
+	new = prepare_creds();
+	if (!new)
+		return -ENOMEM;
+	old = current_cred();
+
 	retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID);
 	if (retval)
-		return retval;
+		goto error;
 
-	if (capable(CAP_SETGID)) {
-		if (old_egid != gid) {
-			set_dumpable(current->mm, suid_dumpable);
-			smp_wmb();
-		}
-		current->gid = current->egid = current->sgid = current->fsgid = gid;
-	} else if ((gid == current->gid) || (gid == current->sgid)) {
-		if (old_egid != gid) {
-			set_dumpable(current->mm, suid_dumpable);
-			smp_wmb();
-		}
-		current->egid = current->fsgid = gid;
-	}
+	retval = -EPERM;
+	if (capable(CAP_SETGID))
+		new->gid = new->egid = new->sgid = new->fsgid = gid;
+	else if (gid == old->gid || gid == old->sgid)
+		new->egid = new->fsgid = gid;
 	else
-		return -EPERM;
+		goto error;
 
-	key_fsgid_changed(current);
-	proc_id_connector(current, PROC_EVENT_GID);
-	return 0;
+	return commit_creds(new);
+
+error:
+	abort_creds(new);
+	return retval;
 }
   
-static int set_user(uid_t new_ruid, int dumpclear)
+/*
+ * change the user struct in a credentials set to match the new UID
+ */
+static int set_user(struct cred *new)
 {
 	struct user_struct *new_user;
 
-	new_user = alloc_uid(current->nsproxy->user_ns, new_ruid);
+	new_user = alloc_uid(current_user_ns(), new->uid);
 	if (!new_user)
 		return -EAGAIN;
 
 	if (atomic_read(&new_user->processes) >=
 				current->signal->rlim[RLIMIT_NPROC].rlim_cur &&
-			new_user != current->nsproxy->user_ns->root_user) {
+			new_user != INIT_USER) {
 		free_uid(new_user);
 		return -EAGAIN;
 	}
 
-	switch_uid(new_user);
-
-	if (dumpclear) {
-		set_dumpable(current->mm, suid_dumpable);
-		smp_wmb();
-	}
-	current->uid = new_ruid;
+	free_uid(new->user);
+	new->user = new_user;
 	return 0;
 }
 
@@ -591,54 +598,56 @@ static int set_user(uid_t new_ruid, int dumpclear)
  */
 asmlinkage long sys_setreuid(uid_t ruid, uid_t euid)
 {
-	int old_ruid, old_euid, old_suid, new_ruid, new_euid;
+	const struct cred *old;
+	struct cred *new;
 	int retval;
 
+	new = prepare_creds();
+	if (!new)
+		return -ENOMEM;
+	old = current_cred();
+
 	retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE);
 	if (retval)
-		return retval;
-
-	new_ruid = old_ruid = current->uid;
-	new_euid = old_euid = current->euid;
-	old_suid = current->suid;
+		goto error;
 
+	retval = -EPERM;
 	if (ruid != (uid_t) -1) {
-		new_ruid = ruid;
-		if ((old_ruid != ruid) &&
-		    (current->euid != ruid) &&
+		new->uid = ruid;
+		if (old->uid != ruid &&
+		    old->euid != ruid &&
 		    !capable(CAP_SETUID))
-			return -EPERM;
+			goto error;
 	}
 
 	if (euid != (uid_t) -1) {
-		new_euid = euid;
-		if ((old_ruid != euid) &&
-		    (current->euid != euid) &&
-		    (current->suid != euid) &&
+		new->euid = euid;
+		if (old->uid != euid &&
+		    old->euid != euid &&
+		    old->suid != euid &&
 		    !capable(CAP_SETUID))
-			return -EPERM;
+			goto error;
 	}
 
-	if (new_ruid != old_ruid && set_user(new_ruid, new_euid != old_euid) < 0)
-		return -EAGAIN;
+	retval = -EAGAIN;
+	if (new->uid != old->uid && set_user(new) < 0)
+		goto error;
 
-	if (new_euid != old_euid) {
-		set_dumpable(current->mm, suid_dumpable);
-		smp_wmb();
-	}
-	current->fsuid = current->euid = new_euid;
 	if (ruid != (uid_t) -1 ||
-	    (euid != (uid_t) -1 && euid != old_ruid))
-		current->suid = current->euid;
-	current->fsuid = current->euid;
+	    (euid != (uid_t) -1 && euid != old->uid))
+		new->suid = new->euid;
+	new->fsuid = new->euid;
 
-	key_fsuid_changed(current);
-	proc_id_connector(current, PROC_EVENT_UID);
-
-	return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RE);
-}
+	retval = security_task_fix_setuid(new, old, LSM_SETID_RE);
+	if (retval < 0)
+		goto error;
 
+	return commit_creds(new);
 
+error:
+	abort_creds(new);
+	return retval;
+}
 		
 /*
  * setuid() is implemented like SysV with SAVED_IDS 
@@ -653,36 +662,41 @@ asmlinkage long sys_setreuid(uid_t ruid, uid_t euid)
  */
 asmlinkage long sys_setuid(uid_t uid)
 {
-	int old_euid = current->euid;
-	int old_ruid, old_suid, new_suid;
+	const struct cred *old;
+	struct cred *new;
 	int retval;
 
+	new = prepare_creds();
+	if (!new)
+		return -ENOMEM;
+	old = current_cred();
+
 	retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID);
 	if (retval)
-		return retval;
+		goto error;
 
-	old_ruid = current->uid;
-	old_suid = current->suid;
-	new_suid = old_suid;
-	
+	retval = -EPERM;
 	if (capable(CAP_SETUID)) {
-		if (uid != old_ruid && set_user(uid, old_euid != uid) < 0)
-			return -EAGAIN;
-		new_suid = uid;
-	} else if ((uid != current->uid) && (uid != new_suid))
-		return -EPERM;
-
-	if (old_euid != uid) {
-		set_dumpable(current->mm, suid_dumpable);
-		smp_wmb();
+		new->suid = new->uid = uid;
+		if (uid != old->uid && set_user(new) < 0) {
+			retval = -EAGAIN;
+			goto error;
+		}
+	} else if (uid != old->uid && uid != new->suid) {
+		goto error;
 	}
-	current->fsuid = current->euid = uid;
-	current->suid = new_suid;
 
-	key_fsuid_changed(current);
-	proc_id_connector(current, PROC_EVENT_UID);
+	new->fsuid = new->euid = uid;
+
+	retval = security_task_fix_setuid(new, old, LSM_SETID_ID);
+	if (retval < 0)
+		goto error;
+
+	return commit_creds(new);
 
-	return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_ID);
+error:
+	abort_creds(new);
+	return retval;
 }
 
 
@@ -692,54 +706,63 @@ asmlinkage long sys_setuid(uid_t uid)
  */
 asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid)
 {
-	int old_ruid = current->uid;
-	int old_euid = current->euid;
-	int old_suid = current->suid;
+	const struct cred *old;
+	struct cred *new;
 	int retval;
 
+	new = prepare_creds();
+	if (!new)
+		return -ENOMEM;
+
 	retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES);
 	if (retval)
-		return retval;
+		goto error;
+	old = current_cred();
 
+	retval = -EPERM;
 	if (!capable(CAP_SETUID)) {
-		if ((ruid != (uid_t) -1) && (ruid != current->uid) &&
-		    (ruid != current->euid) && (ruid != current->suid))
-			return -EPERM;
-		if ((euid != (uid_t) -1) && (euid != current->uid) &&
-		    (euid != current->euid) && (euid != current->suid))
-			return -EPERM;
-		if ((suid != (uid_t) -1) && (suid != current->uid) &&
-		    (suid != current->euid) && (suid != current->suid))
-			return -EPERM;
+		if (ruid != (uid_t) -1 && ruid != old->uid &&
+		    ruid != old->euid  && ruid != old->suid)
+			goto error;
+		if (euid != (uid_t) -1 && euid != old->uid &&
+		    euid != old->euid  && euid != old->suid)
+			goto error;
+		if (suid != (uid_t) -1 && suid != old->uid &&
+		    suid != old->euid  && suid != old->suid)
+			goto error;
 	}
+
+	retval = -EAGAIN;
 	if (ruid != (uid_t) -1) {
-		if (ruid != current->uid && set_user(ruid, euid != current->euid) < 0)
-			return -EAGAIN;
+		new->uid = ruid;
+		if (ruid != old->uid && set_user(new) < 0)
+			goto error;
 	}
-	if (euid != (uid_t) -1) {
-		if (euid != current->euid) {
-			set_dumpable(current->mm, suid_dumpable);
-			smp_wmb();
-		}
-		current->euid = euid;
-	}
-	current->fsuid = current->euid;
+	if (euid != (uid_t) -1)
+		new->euid = euid;
 	if (suid != (uid_t) -1)
-		current->suid = suid;
+		new->suid = suid;
+	new->fsuid = new->euid;
+
+	retval = security_task_fix_setuid(new, old, LSM_SETID_RES);
+	if (retval < 0)
+		goto error;
 
-	key_fsuid_changed(current);
-	proc_id_connector(current, PROC_EVENT_UID);
+	return commit_creds(new);
 
-	return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RES);
+error:
+	abort_creds(new);
+	return retval;
 }
 
 asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __user *suid)
 {
+	const struct cred *cred = current_cred();
 	int retval;
 
-	if (!(retval = put_user(current->uid, ruid)) &&
-	    !(retval = put_user(current->euid, euid)))
-		retval = put_user(current->suid, suid);
+	if (!(retval   = put_user(cred->uid,  ruid)) &&
+	    !(retval   = put_user(cred->euid, euid)))
+		retval = put_user(cred->suid, suid);
 
 	return retval;
 }
@@ -749,48 +772,55 @@ asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __us
  */
 asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
 {
+	const struct cred *old;
+	struct cred *new;
 	int retval;
 
+	new = prepare_creds();
+	if (!new)
+		return -ENOMEM;
+	old = current_cred();
+
 	retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES);
 	if (retval)
-		return retval;
+		goto error;
 
+	retval = -EPERM;
 	if (!capable(CAP_SETGID)) {
-		if ((rgid != (gid_t) -1) && (rgid != current->gid) &&
-		    (rgid != current->egid) && (rgid != current->sgid))
-			return -EPERM;
-		if ((egid != (gid_t) -1) && (egid != current->gid) &&
-		    (egid != current->egid) && (egid != current->sgid))
-			return -EPERM;
-		if ((sgid != (gid_t) -1) && (sgid != current->gid) &&
-		    (sgid != current->egid) && (sgid != current->sgid))
-			return -EPERM;
+		if (rgid != (gid_t) -1 && rgid != old->gid &&
+		    rgid != old->egid  && rgid != old->sgid)
+			goto error;
+		if (egid != (gid_t) -1 && egid != old->gid &&
+		    egid != old->egid  && egid != old->sgid)
+			goto error;
+		if (sgid != (gid_t) -1 && sgid != old->gid &&
+		    sgid != old->egid  && sgid != old->sgid)
+			goto error;
 	}
-	if (egid != (gid_t) -1) {
-		if (egid != current->egid) {
-			set_dumpable(current->mm, suid_dumpable);
-			smp_wmb();
-		}
-		current->egid = egid;
-	}
-	current->fsgid = current->egid;
+
 	if (rgid != (gid_t) -1)
-		current->gid = rgid;
+		new->gid = rgid;
+	if (egid != (gid_t) -1)
+		new->egid = egid;
 	if (sgid != (gid_t) -1)
-		current->sgid = sgid;
+		new->sgid = sgid;
+	new->fsgid = new->egid;
 
-	key_fsgid_changed(current);
-	proc_id_connector(current, PROC_EVENT_GID);
-	return 0;
+	return commit_creds(new);
+
+error:
+	abort_creds(new);
+	return retval;
 }
 
 asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __user *sgid)
 {
+	const struct cred *cred = current_cred();
 	int retval;
 
-	if (!(retval = put_user(current->gid, rgid)) &&
-	    !(retval = put_user(current->egid, egid)))
-		retval = put_user(current->sgid, sgid);
+	if (!(retval   = put_user(cred->gid,  rgid)) &&
+	    !(retval   = put_user(cred->egid, egid)))
+		retval = put_user(cred->sgid, sgid);
 
 	return retval;
 }
@@ -804,27 +834,35 @@ asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __us
  */
 asmlinkage long sys_setfsuid(uid_t uid)
 {
-	int old_fsuid;
+	const struct cred *old;
+	struct cred *new;
+	uid_t old_fsuid;
+
+	new = prepare_creds();
+	if (!new)
+		return current_fsuid();
+	old = current_cred();
+	old_fsuid = old->fsuid;
 
-	old_fsuid = current->fsuid;
-	if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS))
-		return old_fsuid;
+	if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS) < 0)
+		goto error;
 
-	if (uid == current->uid || uid == current->euid ||
-	    uid == current->suid || uid == current->fsuid || 
+	if (uid == old->uid  || uid == old->euid  ||
+	    uid == old->suid || uid == old->fsuid ||
 	    capable(CAP_SETUID)) {
 		if (uid != old_fsuid) {
-			set_dumpable(current->mm, suid_dumpable);
-			smp_wmb();
+			new->fsuid = uid;
+			if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0)
+				goto change_okay;
 		}
-		current->fsuid = uid;
 	}
 
-	key_fsuid_changed(current);
-	proc_id_connector(current, PROC_EVENT_UID);
-
-	security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS);
+error:
+	abort_creds(new);
+	return old_fsuid;
 
+change_okay:
+	commit_creds(new);
 	return old_fsuid;
 }
 
@@ -833,58 +871,59 @@ asmlinkage long sys_setfsuid(uid_t uid)
  */
 asmlinkage long sys_setfsgid(gid_t gid)
 {
-	int old_fsgid;
+	const struct cred *old;
+	struct cred *new;
+	gid_t old_fsgid;
+
+	new = prepare_creds();
+	if (!new)
+		return current_fsgid();
+	old = current_cred();
+	old_fsgid = old->fsgid;
 
-	old_fsgid = current->fsgid;
 	if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS))
-		return old_fsgid;
+		goto error;
 
-	if (gid == current->gid || gid == current->egid ||
-	    gid == current->sgid || gid == current->fsgid || 
+	if (gid == old->gid  || gid == old->egid  ||
+	    gid == old->sgid || gid == old->fsgid ||
 	    capable(CAP_SETGID)) {
 		if (gid != old_fsgid) {
-			set_dumpable(current->mm, suid_dumpable);
-			smp_wmb();
+			new->fsgid = gid;
+			goto change_okay;
 		}
-		current->fsgid = gid;
-		key_fsgid_changed(current);
-		proc_id_connector(current, PROC_EVENT_GID);
 	}
+
+error:
+	abort_creds(new);
+	return old_fsgid;
+
+change_okay:
+	commit_creds(new);
 	return old_fsgid;
 }
 
+void do_sys_times(struct tms *tms)
+{
+	struct task_cputime cputime;
+	cputime_t cutime, cstime;
+
+	thread_group_cputime(current, &cputime);
+	spin_lock_irq(&current->sighand->siglock);
+	cutime = current->signal->cutime;
+	cstime = current->signal->cstime;
+	spin_unlock_irq(&current->sighand->siglock);
+	tms->tms_utime = cputime_to_clock_t(cputime.utime);
+	tms->tms_stime = cputime_to_clock_t(cputime.stime);
+	tms->tms_cutime = cputime_to_clock_t(cutime);
+	tms->tms_cstime = cputime_to_clock_t(cstime);
+}
+
 asmlinkage long sys_times(struct tms __user * tbuf)
 {
-	/*
-	 *	In the SMP world we might just be unlucky and have one of
-	 *	the times increment as we use it. Since the value is an
-	 *	atomically safe type this is just fine. Conceptually its
-	 *	as if the syscall took an instant longer to occur.
-	 */
 	if (tbuf) {
 		struct tms tmp;
-		struct task_struct *tsk = current;
-		struct task_struct *t;
-		cputime_t utime, stime, cutime, cstime;
-
-		spin_lock_irq(&tsk->sighand->siglock);
-		utime = tsk->signal->utime;
-		stime = tsk->signal->stime;
-		t = tsk;
-		do {
-			utime = cputime_add(utime, t->utime);
-			stime = cputime_add(stime, t->stime);
-			t = next_thread(t);
-		} while (t != tsk);
-
-		cutime = tsk->signal->cutime;
-		cstime = tsk->signal->cstime;
-		spin_unlock_irq(&tsk->sighand->siglock);
-
-		tmp.tms_utime = cputime_to_clock_t(utime);
-		tmp.tms_stime = cputime_to_clock_t(stime);
-		tmp.tms_cutime = cputime_to_clock_t(cutime);
-		tmp.tms_cstime = cputime_to_clock_t(cstime);
+
+		do_sys_times(&tmp);
 		if (copy_to_user(tbuf, &tmp, sizeof(struct tms)))
 			return -EFAULT;
 	}
@@ -1128,7 +1167,7 @@ EXPORT_SYMBOL(groups_free);
 
 /* export the group_info to a user-space array */
 static int groups_to_user(gid_t __user *grouplist,
-    struct group_info *group_info)
+			  const struct group_info *group_info)
 {
 	int i;
 	unsigned int count = group_info->ngroups;
@@ -1196,7 +1235,7 @@ static void groups_sort(struct group_info *group_info)
 }
 
 /* a simple bsearch */
-int groups_search(struct group_info *group_info, gid_t grp)
+int groups_search(const struct group_info *group_info, gid_t grp)
 {
 	unsigned int left, right;
 
@@ -1218,51 +1257,74 @@ int groups_search(struct group_info *group_info, gid_t grp)
 	return 0;
 }
 
-/* validate and set current->group_info */
-int set_current_groups(struct group_info *group_info)
+/**
+ * set_groups - Change a group subscription in a set of credentials
+ * @new: The newly prepared set of credentials to alter
+ * @group_info: The group list to install
+ *
+ * Validate a group subscription and, if valid, insert it into a set
+ * of credentials.
+ */
+int set_groups(struct cred *new, struct group_info *group_info)
 {
 	int retval;
-	struct group_info *old_info;
 
 	retval = security_task_setgroups(group_info);
 	if (retval)
 		return retval;
 
+	put_group_info(new->group_info);
 	groups_sort(group_info);
 	get_group_info(group_info);
+	new->group_info = group_info;
+	return 0;
+}
 
-	task_lock(current);
-	old_info = current->group_info;
-	current->group_info = group_info;
-	task_unlock(current);
+EXPORT_SYMBOL(set_groups);
 
-	put_group_info(old_info);
+/**
+ * set_current_groups - Change current's group subscription
+ * @group_info: The group list to impose
+ *
+ * Validate a group subscription and, if valid, impose it upon current's task
+ * security record.
+ */
+int set_current_groups(struct group_info *group_info)
+{
+	struct cred *new;
+	int ret;
 
-	return 0;
+	new = prepare_creds();
+	if (!new)
+		return -ENOMEM;
+
+	ret = set_groups(new, group_info);
+	if (ret < 0) {
+		abort_creds(new);
+		return ret;
+	}
+
+	return commit_creds(new);
 }
 
 EXPORT_SYMBOL(set_current_groups);
 
 asmlinkage long sys_getgroups(int gidsetsize, gid_t __user *grouplist)
 {
-	int i = 0;
-
-	/*
-	 *	SMP: Nobody else can change our grouplist. Thus we are
-	 *	safe.
-	 */
+	const struct cred *cred = current_cred();
+	int i;
 
 	if (gidsetsize < 0)
 		return -EINVAL;
 
 	/* no need to grab task_lock here; it cannot change */
-	i = current->group_info->ngroups;
+	i = cred->group_info->ngroups;
 	if (gidsetsize) {
 		if (i > gidsetsize) {
 			i = -EINVAL;
 			goto out;
 		}
-		if (groups_to_user(grouplist, current->group_info)) {
+		if (groups_to_user(grouplist, cred->group_info)) {
 			i = -EFAULT;
 			goto out;
 		}
@@ -1306,9 +1368,11 @@ asmlinkage long sys_setgroups(int gidsetsize, gid_t __user *grouplist)
  */
 int in_group_p(gid_t grp)
 {
+	const struct cred *cred = current_cred();
 	int retval = 1;
-	if (grp != current->fsgid)
-		retval = groups_search(current->group_info, grp);
+
+	if (grp != cred->fsgid)
+		retval = groups_search(cred->group_info, grp);
 	return retval;
 }
 
@@ -1316,9 +1380,11 @@ EXPORT_SYMBOL(in_group_p);
 
 int in_egroup_p(gid_t grp)
 {
+	const struct cred *cred = current_cred();
 	int retval = 1;
-	if (grp != current->egid)
-		retval = groups_search(current->group_info, grp);
+
+	if (grp != cred->egid)
+		retval = groups_search(cred->group_info, grp);
 	return retval;
 }
 
@@ -1349,8 +1415,10 @@ asmlinkage long sys_sethostname(char __user *name, int len)
 	down_write(&uts_sem);
 	errno = -EFAULT;
 	if (!copy_from_user(tmp, name, len)) {
-		memcpy(utsname()->nodename, tmp, len);
-		utsname()->nodename[len] = 0;
+		struct new_utsname *u = utsname();
+
+		memcpy(u->nodename, tmp, len);
+		memset(u->nodename + len, 0, sizeof(u->nodename) - len);
 		errno = 0;
 	}
 	up_write(&uts_sem);
@@ -1362,15 +1430,17 @@ asmlinkage long sys_sethostname(char __user *name, int len)
 asmlinkage long sys_gethostname(char __user *name, int len)
 {
 	int i, errno;
+	struct new_utsname *u;
 
 	if (len < 0)
 		return -EINVAL;
 	down_read(&uts_sem);
-	i = 1 + strlen(utsname()->nodename);
+	u = utsname();
+	i = 1 + strlen(u->nodename);
 	if (i > len)
 		i = len;
 	errno = 0;
-	if (copy_to_user(name, utsname()->nodename, i))
+	if (copy_to_user(name, u->nodename, i))
 		errno = -EFAULT;
 	up_read(&uts_sem);
 	return errno;
@@ -1395,8 +1465,10 @@ asmlinkage long sys_setdomainname(char __user *name, int len)
 	down_write(&uts_sem);
 	errno = -EFAULT;
 	if (!copy_from_user(tmp, name, len)) {
-		memcpy(utsname()->domainname, tmp, len);
-		utsname()->domainname[len] = 0;
+		struct new_utsname *u = utsname();
+
+		memcpy(u->domainname, tmp, len);
+		memset(u->domainname + len, 0, sizeof(u->domainname) - len);
 		errno = 0;
 	}
 	up_write(&uts_sem);
@@ -1443,21 +1515,28 @@ asmlinkage long sys_old_getrlimit(unsigned int resource, struct rlimit __user *r
 asmlinkage long sys_setrlimit(unsigned int resource, struct rlimit __user *rlim)
 {
 	struct rlimit new_rlim, *old_rlim;
-	unsigned long it_prof_secs;
 	int retval;
 
 	if (resource >= RLIM_NLIMITS)
 		return -EINVAL;
 	if (copy_from_user(&new_rlim, rlim, sizeof(*rlim)))
 		return -EFAULT;
-	if (new_rlim.rlim_cur > new_rlim.rlim_max)
-		return -EINVAL;
 	old_rlim = current->signal->rlim + resource;
 	if ((new_rlim.rlim_max > old_rlim->rlim_max) &&
 	    !capable(CAP_SYS_RESOURCE))
 		return -EPERM;
-	if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > sysctl_nr_open)
-		return -EPERM;
+
+	if (resource == RLIMIT_NOFILE) {
+		if (new_rlim.rlim_max == RLIM_INFINITY)
+			new_rlim.rlim_max = sysctl_nr_open;
+		if (new_rlim.rlim_cur == RLIM_INFINITY)
+			new_rlim.rlim_cur = sysctl_nr_open;
+		if (new_rlim.rlim_max > sysctl_nr_open)
+			return -EPERM;
+	}
+
+	if (new_rlim.rlim_cur > new_rlim.rlim_max)
+		return -EINVAL;
 
 	retval = security_task_setrlimit(resource, &new_rlim);
 	if (retval)
@@ -1489,18 +1568,7 @@ asmlinkage long sys_setrlimit(unsigned int resource, struct rlimit __user *rlim)
 	if (new_rlim.rlim_cur == RLIM_INFINITY)
 		goto out;
 
-	it_prof_secs = cputime_to_secs(current->signal->it_prof_expires);
-	if (it_prof_secs == 0 || new_rlim.rlim_cur <= it_prof_secs) {
-		unsigned long rlim_cur = new_rlim.rlim_cur;
-		cputime_t cputime;
-
-		cputime = secs_to_cputime(rlim_cur);
-		read_lock(&tasklist_lock);
-		spin_lock_irq(&current->sighand->siglock);
-		set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL);
-		spin_unlock_irq(&current->sighand->siglock);
-		read_unlock(&tasklist_lock);
-	}
+	update_rlimit_cpu(new_rlim.rlim_cur);
 out:
 	return 0;
 }
@@ -1538,11 +1606,8 @@ out:
  *
  */
 
-static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r,
-				     cputime_t *utimep, cputime_t *stimep)
+static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r)
 {
-	*utimep = cputime_add(*utimep, t->utime);
-	*stimep = cputime_add(*stimep, t->stime);
 	r->ru_nvcsw += t->nvcsw;
 	r->ru_nivcsw += t->nivcsw;
 	r->ru_minflt += t->min_flt;
@@ -1556,12 +1621,13 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
 	struct task_struct *t;
 	unsigned long flags;
 	cputime_t utime, stime;
+	struct task_cputime cputime;
 
 	memset((char *) r, 0, sizeof *r);
 	utime = stime = cputime_zero;
 
 	if (who == RUSAGE_THREAD) {
-		accumulate_thread_rusage(p, r, &utime, &stime);
+		accumulate_thread_rusage(p, r);
 		goto out;
 	}
 
@@ -1584,8 +1650,9 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
 				break;
 
 		case RUSAGE_SELF:
-			utime = cputime_add(utime, p->signal->utime);
-			stime = cputime_add(stime, p->signal->stime);
+			thread_group_cputime(p, &cputime);
+			utime = cputime_add(utime, cputime.utime);
+			stime = cputime_add(stime, cputime.stime);
 			r->ru_nvcsw += p->signal->nvcsw;
 			r->ru_nivcsw += p->signal->nivcsw;
 			r->ru_minflt += p->signal->min_flt;
@@ -1594,7 +1661,7 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
 			r->ru_oublock += p->signal->oublock;
 			t = p;
 			do {
-				accumulate_thread_rusage(t, r, &utime, &stime);
+				accumulate_thread_rusage(t, r);
 				t = next_thread(t);
 			} while (t != p);
 			break;
@@ -1633,50 +1700,56 @@ asmlinkage long sys_umask(int mask)
 asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
 			  unsigned long arg4, unsigned long arg5)
 {
-	long error = 0;
+	struct task_struct *me = current;
+	unsigned char comm[sizeof(me->comm)];
+	long error;
 
-	if (security_task_prctl(option, arg2, arg3, arg4, arg5, &error))
+	error = security_task_prctl(option, arg2, arg3, arg4, arg5);
+	if (error != -ENOSYS)
 		return error;
 
+	error = 0;
 	switch (option) {
 		case PR_SET_PDEATHSIG:
 			if (!valid_signal(arg2)) {
 				error = -EINVAL;
 				break;
 			}
-			current->pdeath_signal = arg2;
+			me->pdeath_signal = arg2;
+			error = 0;
 			break;
 		case PR_GET_PDEATHSIG:
-			error = put_user(current->pdeath_signal, (int __user *)arg2);
+			error = put_user(me->pdeath_signal, (int __user *)arg2);
 			break;
 		case PR_GET_DUMPABLE:
-			error = get_dumpable(current->mm);
+			error = get_dumpable(me->mm);
 			break;
 		case PR_SET_DUMPABLE:
 			if (arg2 < 0 || arg2 > 1) {
 				error = -EINVAL;
 				break;
 			}
-			set_dumpable(current->mm, arg2);
+			set_dumpable(me->mm, arg2);
+			error = 0;
 			break;
 
 		case PR_SET_UNALIGN:
-			error = SET_UNALIGN_CTL(current, arg2);
+			error = SET_UNALIGN_CTL(me, arg2);
 			break;
 		case PR_GET_UNALIGN:
-			error = GET_UNALIGN_CTL(current, arg2);
+			error = GET_UNALIGN_CTL(me, arg2);
 			break;
 		case PR_SET_FPEMU:
-			error = SET_FPEMU_CTL(current, arg2);
+			error = SET_FPEMU_CTL(me, arg2);
 			break;
 		case PR_GET_FPEMU:
-			error = GET_FPEMU_CTL(current, arg2);
+			error = GET_FPEMU_CTL(me, arg2);
 			break;
 		case PR_SET_FPEXC:
-			error = SET_FPEXC_CTL(current, arg2);
+			error = SET_FPEXC_CTL(me, arg2);
 			break;
 		case PR_GET_FPEXC:
-			error = GET_FPEXC_CTL(current, arg2);
+			error = GET_FPEXC_CTL(me, arg2);
 			break;
 		case PR_GET_TIMING:
 			error = PR_TIMING_STATISTICAL;
@@ -1684,33 +1757,28 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
 		case PR_SET_TIMING:
 			if (arg2 != PR_TIMING_STATISTICAL)
 				error = -EINVAL;
+			else
+				error = 0;
 			break;
 
-		case PR_SET_NAME: {
-			struct task_struct *me = current;
-			unsigned char ncomm[sizeof(me->comm)];
-
-			ncomm[sizeof(me->comm)-1] = 0;
-			if (strncpy_from_user(ncomm, (char __user *)arg2,
-						sizeof(me->comm)-1) < 0)
+		case PR_SET_NAME:
+			comm[sizeof(me->comm)-1] = 0;
+			if (strncpy_from_user(comm, (char __user *)arg2,
+					      sizeof(me->comm) - 1) < 0)
 				return -EFAULT;
-			set_task_comm(me, ncomm);
+			set_task_comm(me, comm);
 			return 0;
-		}
-		case PR_GET_NAME: {
-			struct task_struct *me = current;
-			unsigned char tcomm[sizeof(me->comm)];
-
-			get_task_comm(tcomm, me);
-			if (copy_to_user((char __user *)arg2, tcomm, sizeof(tcomm)))
+		case PR_GET_NAME:
+			get_task_comm(comm, me);
+			if (copy_to_user((char __user *)arg2, comm,
+					 sizeof(comm)))
 				return -EFAULT;
 			return 0;
-		}
 		case PR_GET_ENDIAN:
-			error = GET_ENDIAN(current, arg2);
+			error = GET_ENDIAN(me, arg2);
 			break;
 		case PR_SET_ENDIAN:
-			error = SET_ENDIAN(current, arg2);
+			error = SET_ENDIAN(me, arg2);
 			break;
 
 		case PR_GET_SECCOMP:
@@ -1725,6 +1793,17 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
 		case PR_SET_TSC:
 			error = SET_TSC_CTL(arg2);
 			break;
+		case PR_GET_TIMERSLACK:
+			error = current->timer_slack_ns;
+			break;
+		case PR_SET_TIMERSLACK:
+			if (arg2 <= 0)
+				current->timer_slack_ns =
+					current->default_timer_slack_ns;
+			else
+				current->timer_slack_ns = arg2;
+			error = 0;
+			break;
 		default:
 			error = -EINVAL;
 			break;
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 503d8d4eb80a..e14a23281707 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -31,7 +31,7 @@ cond_syscall(sys_socketpair);
 cond_syscall(sys_bind);
 cond_syscall(sys_listen);
 cond_syscall(sys_accept);
-cond_syscall(sys_paccept);
+cond_syscall(sys_accept4);
 cond_syscall(sys_connect);
 cond_syscall(sys_getsockname);
 cond_syscall(sys_getpeername);
@@ -126,6 +126,11 @@ cond_syscall(sys_vm86);
 cond_syscall(compat_sys_ipc);
 cond_syscall(compat_sys_sysctl);
 cond_syscall(sys_flock);
+cond_syscall(sys_io_setup);
+cond_syscall(sys_io_destroy);
+cond_syscall(sys_io_submit);
+cond_syscall(sys_io_cancel);
+cond_syscall(sys_io_getevents);
 
 /* arch-specific weak syscall entries */
 cond_syscall(sys_pciconfig_read);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index cfc5295f1e82..ff6d45c7626f 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -121,6 +121,10 @@ extern int sg_big_buff;
 #include <asm/system.h>
 #endif
 
+#ifdef CONFIG_SPARC64
+extern int sysctl_tsb_ratio;
+#endif
+
 #ifdef __hppa__
 extern int pwrsw_enabled;
 extern int unaligned_enabled;
@@ -149,7 +153,7 @@ extern int max_lock_depth;
 #ifdef CONFIG_PROC_SYSCTL
 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
 		  void __user *buffer, size_t *lenp, loff_t *ppos);
-static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
+static int proc_taint(struct ctl_table *table, int write, struct file *filp,
 			       void __user *buffer, size_t *lenp, loff_t *ppos);
 #endif
 
@@ -176,6 +180,9 @@ extern struct ctl_table random_table[];
 #ifdef CONFIG_INOTIFY_USER
 extern struct ctl_table inotify_table[];
 #endif
+#ifdef CONFIG_EPOLL
+extern struct ctl_table epoll_table[];
+#endif
 
 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 int sysctl_legacy_va_layout;
@@ -276,6 +283,16 @@ static struct ctl_table kern_table[] = {
 	},
 	{
 		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "sched_shares_thresh",
+		.data		= &sysctl_sched_shares_thresh,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &zero,
+	},
+	{
+		.ctl_name	= CTL_UNNUMBERED,
 		.procname	= "sched_child_runs_first",
 		.data		= &sysctl_sched_child_runs_first,
 		.maxlen		= sizeof(unsigned int),
@@ -379,10 +396,9 @@ static struct ctl_table kern_table[] = {
 #ifdef CONFIG_PROC_SYSCTL
 	{
 		.procname	= "tainted",
-		.data		= &tainted,
-		.maxlen		= sizeof(int),
+		.maxlen 	= sizeof(long),
 		.mode		= 0644,
-		.proc_handler	= &proc_dointvec_taint,
+		.proc_handler	= &proc_taint,
 	},
 #endif
 #ifdef CONFIG_LATENCYTOP
@@ -439,6 +455,16 @@ static struct ctl_table kern_table[] = {
 		.proc_handler	= &proc_dointvec,
 	},
 #endif
+#ifdef CONFIG_SPARC64
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "tsb-ratio",
+		.data		= &sysctl_tsb_ratio,
+		.maxlen		= sizeof (int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+#endif
 #ifdef __hppa__
 	{
 		.ctl_name	= KERN_HPPA_PWRSW,
@@ -465,7 +491,7 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec,
 	},
-#ifdef CONFIG_FTRACE
+#ifdef CONFIG_FUNCTION_TRACER
 	{
 		.ctl_name	= CTL_UNNUMBERED,
 		.procname	= "ftrace_enabled",
@@ -475,6 +501,26 @@ static struct ctl_table kern_table[] = {
 		.proc_handler	= &ftrace_enable_sysctl,
 	},
 #endif
+#ifdef CONFIG_STACK_TRACER
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "stack_tracer_enabled",
+		.data		= &stack_tracer_enabled,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &stack_trace_sysctl,
+	},
+#endif
+#ifdef CONFIG_TRACING
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "ftrace_dump_on_oops",
+		.data		= &ftrace_dump_on_oops,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+#endif
 #ifdef CONFIG_MODULES
 	{
 		.ctl_name	= KERN_MODPROBE,
@@ -834,6 +880,16 @@ static struct ctl_table kern_table[] = {
 		.proc_handler   = &proc_dointvec,
 	},
 #endif
+#ifdef CONFIG_UNEVICTABLE_LRU
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "scan_unevictable_pages",
+		.data		= &scan_unevictable_pages,
+		.maxlen		= sizeof(scan_unevictable_pages),
+		.mode		= 0644,
+		.proc_handler	= &scan_unevictable_handler,
+	},
+#endif
 /*
  * NOTE: do not add new entries to this table unless you have read
  * Documentation/sysctl/ctl_unnumbered.txt
@@ -1282,6 +1338,7 @@ static struct ctl_table fs_table[] = {
 		.extra2		= &two,
 	},
 #endif
+#ifdef CONFIG_AIO
 	{
 		.procname	= "aio-nr",
 		.data		= &aio_nr,
@@ -1296,6 +1353,7 @@ static struct ctl_table fs_table[] = {
 		.mode		= 0644,
 		.proc_handler	= &proc_doulongvec_minmax,
 	},
+#endif /* CONFIG_AIO */
 #ifdef CONFIG_INOTIFY_USER
 	{
 		.ctl_name	= FS_INOTIFY,
@@ -1304,6 +1362,13 @@ static struct ctl_table fs_table[] = {
 		.child		= inotify_table,
 	},
 #endif	
+#ifdef CONFIG_EPOLL
+	{
+		.procname	= "epoll",
+		.mode		= 0555,
+		.child		= epoll_table,
+	},
+#endif
 #endif
 	{
 		.ctl_name	= KERN_SETUID_DUMPABLE,
@@ -1501,7 +1566,6 @@ void register_sysctl_root(struct ctl_table_root *root)
 /* Perform the actual read/write of a sysctl table entry. */
 static int do_sysctl_strategy(struct ctl_table_root *root,
 			struct ctl_table *table,
-			int __user *name, int nlen,
 			void __user *oldval, size_t __user *oldlenp,
 			void __user *newval, size_t newlen)
 {
@@ -1515,8 +1579,7 @@ static int do_sysctl_strategy(struct ctl_table_root *root,
 		return -EPERM;
 
 	if (table->strategy) {
-		rc = table->strategy(table, name, nlen, oldval, oldlenp,
-				     newval, newlen);
+		rc = table->strategy(table, oldval, oldlenp, newval, newlen);
 		if (rc < 0)
 			return rc;
 		if (rc > 0)
@@ -1526,8 +1589,7 @@ static int do_sysctl_strategy(struct ctl_table_root *root,
 	/* If there is no strategy routine, or if the strategy returns
 	 * zero, proceed with automatic r/w */
 	if (table->data && table->maxlen) {
-		rc = sysctl_data(table, name, nlen, oldval, oldlenp,
-				 newval, newlen);
+		rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
 		if (rc < 0)
 			return rc;
 	}
@@ -1559,7 +1621,7 @@ repeat:
 				table = table->child;
 				goto repeat;
 			}
-			error = do_sysctl_strategy(root, table, name, nlen,
+			error = do_sysctl_strategy(root, table,
 						   oldval, oldlenp,
 						   newval, newlen);
 			return error;
@@ -1623,7 +1685,7 @@ out:
 
 static int test_perm(int mode, int op)
 {
-	if (!current->euid)
+	if (!current_euid())
 		mode >>= 6;
 	else if (in_egroup_p(0))
 		mode >>= 3;
@@ -2228,49 +2290,39 @@ int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
 		    	    NULL,NULL);
 }
 
-#define OP_SET	0
-#define OP_AND	1
-#define OP_OR	2
-
-static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
-				      int *valp,
-				      int write, void *data)
-{
-	int op = *(int *)data;
-	if (write) {
-		int val = *negp ? -*lvalp : *lvalp;
-		switch(op) {
-		case OP_SET:	*valp = val; break;
-		case OP_AND:	*valp &= val; break;
-		case OP_OR:	*valp |= val; break;
-		}
-	} else {
-		int val = *valp;
-		if (val < 0) {
-			*negp = -1;
-			*lvalp = (unsigned long)-val;
-		} else {
-			*negp = 0;
-			*lvalp = (unsigned long)val;
-		}
-	}
-	return 0;
-}
-
 /*
- *	Taint values can only be increased
+ * Taint values can only be increased
+ * This means we can safely use a temporary.
  */
-static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
+static int proc_taint(struct ctl_table *table, int write, struct file *filp,
 			       void __user *buffer, size_t *lenp, loff_t *ppos)
 {
-	int op;
+	struct ctl_table t;
+	unsigned long tmptaint = get_taint();
+	int err;
 
 	if (write && !capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-	op = OP_OR;
-	return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
-				do_proc_dointvec_bset_conv,&op);
+	t = *table;
+	t.data = &tmptaint;
+	err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
+	if (err < 0)
+		return err;
+
+	if (write) {
+		/*
+		 * Poor man's atomic or. Not worth adding a primitive
+		 * to everyone's atomic.h for this
+		 */
+		int i;
+		for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
+			if ((tmptaint >> i) & 1)
+				add_taint(i);
+		}
+	}
+
+	return err;
 }
 
 struct do_proc_dointvec_minmax_conv_param {
@@ -2718,7 +2770,7 @@ int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
  */
 
 /* The generic sysctl data routine (used if no strategy routine supplied) */
-int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_data(struct ctl_table *table,
 		void __user *oldval, size_t __user *oldlenp,
 		void __user *newval, size_t newlen)
 {
@@ -2752,7 +2804,7 @@ int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
 }
 
 /* The generic string strategy routine: */
-int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_string(struct ctl_table *table,
 		  void __user *oldval, size_t __user *oldlenp,
 		  void __user *newval, size_t newlen)
 {
@@ -2798,7 +2850,7 @@ int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
  * are between the minimum and maximum values given in the arrays
  * table->extra1 and table->extra2, respectively.
  */
-int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_intvec(struct ctl_table *table,
 		void __user *oldval, size_t __user *oldlenp,
 		void __user *newval, size_t newlen)
 {
@@ -2834,7 +2886,7 @@ int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
 }
 
 /* Strategy function to convert jiffies to seconds */ 
-int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_jiffies(struct ctl_table *table,
 		void __user *oldval, size_t __user *oldlenp,
 		void __user *newval, size_t newlen)
 {
@@ -2868,7 +2920,7 @@ int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
 }
 
 /* Strategy function to convert jiffies to seconds */ 
-int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_ms_jiffies(struct ctl_table *table,
 		void __user *oldval, size_t __user *oldlenp,
 		void __user *newval, size_t newlen)
 {
@@ -2923,35 +2975,35 @@ asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
 	return error;
 }
 
-int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_data(struct ctl_table *table,
 		  void __user *oldval, size_t __user *oldlenp,
 		  void __user *newval, size_t newlen)
 {
 	return -ENOSYS;
 }
 
-int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_string(struct ctl_table *table,
 		  void __user *oldval, size_t __user *oldlenp,
 		  void __user *newval, size_t newlen)
 {
 	return -ENOSYS;
 }
 
-int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_intvec(struct ctl_table *table,
 		void __user *oldval, size_t __user *oldlenp,
 		void __user *newval, size_t newlen)
 {
 	return -ENOSYS;
 }
 
-int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_jiffies(struct ctl_table *table,
 		void __user *oldval, size_t __user *oldlenp,
 		void __user *newval, size_t newlen)
 {
 	return -ENOSYS;
 }
 
-int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_ms_jiffies(struct ctl_table *table,
 		void __user *oldval, size_t __user *oldlenp,
 		void __user *newval, size_t newlen)
 {
diff --git a/kernel/sysctl_check.c b/kernel/sysctl_check.c
index c35da23ab8fb..fafeb48f27c0 100644
--- a/kernel/sysctl_check.c
+++ b/kernel/sysctl_check.c
@@ -730,7 +730,6 @@ static const struct trans_ctl_table trans_fs_quota_table[] = {
 };
 
 static const struct trans_ctl_table trans_fs_xfs_table[] = {
-	{ XFS_RESTRICT_CHOWN,	"restrict_chown" },
 	{ XFS_SGID_INHERIT,	"irix_sgid_inherit" },
 	{ XFS_SYMLINK_MODE,	"irix_symlink_mode" },
 	{ XFS_PANIC_MASK,	"panic_mask" },
diff --git a/kernel/time.c b/kernel/time.c
index 6a08660b4fac..d63a4336fad6 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -669,3 +669,21 @@ EXPORT_SYMBOL(get_jiffies_64);
 #endif
 
 EXPORT_SYMBOL(jiffies);
+
+/*
+ * Add two timespec values and do a safety check for overflow.
+ * It's assumed that both values are valid (>= 0)
+ */
+struct timespec timespec_add_safe(const struct timespec lhs,
+				  const struct timespec rhs)
+{
+	struct timespec res;
+
+	set_normalized_timespec(&res, lhs.tv_sec + rhs.tv_sec,
+				lhs.tv_nsec + rhs.tv_nsec);
+
+	if (res.tv_sec < lhs.tv_sec || res.tv_sec < rhs.tv_sec)
+		res.tv_sec = TIME_T_MAX;
+
+	return res;
+}
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 8d53106a0a92..95ed42951e0a 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -3,7 +3,6 @@
 #
 config TICK_ONESHOT
 	bool
-	default n
 
 config NO_HZ
 	bool "Tickless System (Dynamic Ticks)"
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 093d4acf993b..9ed2eec97526 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -325,6 +325,9 @@ int clocksource_register(struct clocksource *c)
 	unsigned long flags;
 	int ret;
 
+	/* save mult_orig on registration */
+	c->mult_orig = c->mult;
+
 	spin_lock_irqsave(&clocksource_lock, flags);
 	ret = clocksource_enqueue(c);
 	if (!ret)
diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
index 4c256fdb8875..1ca99557e929 100644
--- a/kernel/time/jiffies.c
+++ b/kernel/time/jiffies.c
@@ -61,6 +61,7 @@ struct clocksource clocksource_jiffies = {
 	.read		= jiffies_read,
 	.mask		= 0xffffffff, /*32bits*/
 	.mult		= NSEC_PER_JIFFY << JIFFIES_SHIFT, /* details above */
+	.mult_orig	= NSEC_PER_JIFFY << JIFFIES_SHIFT,
 	.shift		= JIFFIES_SHIFT,
 };
 
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 1ad46f3df6e7..f5f793d92415 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -10,13 +10,13 @@
 
 #include <linux/mm.h>
 #include <linux/time.h>
-#include <linux/timer.h>
 #include <linux/timex.h>
 #include <linux/jiffies.h>
 #include <linux/hrtimer.h>
 #include <linux/capability.h>
 #include <linux/math64.h>
 #include <linux/clocksource.h>
+#include <linux/workqueue.h>
 #include <asm/timex.h>
 
 /*
@@ -131,7 +131,7 @@ static enum hrtimer_restart ntp_leap_second(struct hrtimer *timer)
 {
 	enum hrtimer_restart res = HRTIMER_NORESTART;
 
-	write_seqlock_irq(&xtime_lock);
+	write_seqlock(&xtime_lock);
 
 	switch (time_state) {
 	case TIME_OK:
@@ -142,8 +142,7 @@ static enum hrtimer_restart ntp_leap_second(struct hrtimer *timer)
 		time_state = TIME_OOP;
 		printk(KERN_NOTICE "Clock: "
 		       "inserting leap second 23:59:60 UTC\n");
-		leap_timer.expires = ktime_add_ns(leap_timer.expires,
-						  NSEC_PER_SEC);
+		hrtimer_add_expires_ns(&leap_timer, NSEC_PER_SEC);
 		res = HRTIMER_RESTART;
 		break;
 	case TIME_DEL:
@@ -165,7 +164,7 @@ static enum hrtimer_restart ntp_leap_second(struct hrtimer *timer)
 	}
 	update_vsyscall(&xtime, clock);
 
-	write_sequnlock_irq(&xtime_lock);
+	write_sequnlock(&xtime_lock);
 
 	return res;
 }
@@ -218,11 +217,11 @@ void second_overflow(void)
 /* Disable the cmos update - used by virtualization and embedded */
 int no_sync_cmos_clock  __read_mostly;
 
-static void sync_cmos_clock(unsigned long dummy);
+static void sync_cmos_clock(struct work_struct *work);
 
-static DEFINE_TIMER(sync_cmos_timer, sync_cmos_clock, 0, 0);
+static DECLARE_DELAYED_WORK(sync_cmos_work, sync_cmos_clock);
 
-static void sync_cmos_clock(unsigned long dummy)
+static void sync_cmos_clock(struct work_struct *work)
 {
 	struct timespec now, next;
 	int fail = 1;
@@ -258,13 +257,13 @@ static void sync_cmos_clock(unsigned long dummy)
 		next.tv_sec++;
 		next.tv_nsec -= NSEC_PER_SEC;
 	}
-	mod_timer(&sync_cmos_timer, jiffies + timespec_to_jiffies(&next));
+	schedule_delayed_work(&sync_cmos_work, timespec_to_jiffies(&next));
 }
 
 static void notify_cmos_timer(void)
 {
 	if (!no_sync_cmos_clock)
-		mod_timer(&sync_cmos_timer, jiffies + 1);
+		schedule_delayed_work(&sync_cmos_work, 0);
 }
 
 #else
@@ -277,38 +276,50 @@ static inline void notify_cmos_timer(void) { }
 int do_adjtimex(struct timex *txc)
 {
 	struct timespec ts;
-	long save_adjust, sec;
 	int result;
 
-	/* In order to modify anything, you gotta be super-user! */
-	if (txc->modes && !capable(CAP_SYS_TIME))
-		return -EPERM;
-
-	/* Now we validate the data before disabling interrupts */
-
-	if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT) {
+	/* Validate the data before disabling interrupts */
+	if (txc->modes & ADJ_ADJTIME) {
 		/* singleshot must not be used with any other mode bits */
-		if (txc->modes & ~ADJ_OFFSET_SS_READ)
+		if (!(txc->modes & ADJ_OFFSET_SINGLESHOT))
 			return -EINVAL;
+		if (!(txc->modes & ADJ_OFFSET_READONLY) &&
+		    !capable(CAP_SYS_TIME))
+			return -EPERM;
+	} else {
+		/* In order to modify anything, you gotta be super-user! */
+		 if (txc->modes && !capable(CAP_SYS_TIME))
+			return -EPERM;
+
+		/* if the quartz is off by more than 10% something is VERY wrong! */
+		if (txc->modes & ADJ_TICK &&
+		    (txc->tick <  900000/USER_HZ ||
+		     txc->tick > 1100000/USER_HZ))
+				return -EINVAL;
+
+		if (txc->modes & ADJ_STATUS && time_state != TIME_OK)
+			hrtimer_cancel(&leap_timer);
 	}
 
-	/* if the quartz is off by more than 10% something is VERY wrong ! */
-	if (txc->modes & ADJ_TICK)
-		if (txc->tick <  900000/USER_HZ ||
-		    txc->tick > 1100000/USER_HZ)
-			return -EINVAL;
-
-	if (time_state != TIME_OK && txc->modes & ADJ_STATUS)
-		hrtimer_cancel(&leap_timer);
 	getnstimeofday(&ts);
 
 	write_seqlock_irq(&xtime_lock);
 
-	/* Save for later - semantics of adjtime is to return old value */
-	save_adjust = time_adjust;
-
 	/* If there are input parameters, then process them */
+	if (txc->modes & ADJ_ADJTIME) {
+		long save_adjust = time_adjust;
+
+		if (!(txc->modes & ADJ_OFFSET_READONLY)) {
+			/* adjtime() is independent from ntp_adjtime() */
+			time_adjust = txc->offset;
+			ntp_update_frequency();
+		}
+		txc->offset = save_adjust;
+		goto adj_done;
+	}
 	if (txc->modes) {
+		long sec;
+
 		if (txc->modes & ADJ_STATUS) {
 			if ((time_status & STA_PLL) &&
 			    !(txc->status & STA_PLL)) {
@@ -375,13 +386,8 @@ int do_adjtimex(struct timex *txc)
 		if (txc->modes & ADJ_TAI && txc->constant > 0)
 			time_tai = txc->constant;
 
-		if (txc->modes & ADJ_OFFSET) {
-			if (txc->modes == ADJ_OFFSET_SINGLESHOT)
-				/* adjtime() is independent from ntp_adjtime() */
-				time_adjust = txc->offset;
-			else
-				ntp_update_offset(txc->offset);
-		}
+		if (txc->modes & ADJ_OFFSET)
+			ntp_update_offset(txc->offset);
 		if (txc->modes & ADJ_TICK)
 			tick_usec = txc->tick;
 
@@ -389,22 +395,18 @@ int do_adjtimex(struct timex *txc)
 			ntp_update_frequency();
 	}
 
+	txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
+				  NTP_SCALE_SHIFT);
+	if (!(time_status & STA_NANO))
+		txc->offset /= NSEC_PER_USEC;
+
+adj_done:
 	result = time_state;	/* mostly `TIME_OK' */
 	if (time_status & (STA_UNSYNC|STA_CLOCKERR))
 		result = TIME_ERROR;
 
-	if ((txc->modes == ADJ_OFFSET_SINGLESHOT) ||
-	    (txc->modes == ADJ_OFFSET_SS_READ))
-		txc->offset = save_adjust;
-	else {
-		txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
-					  NTP_SCALE_SHIFT);
-		if (!(time_status & STA_NANO))
-			txc->offset /= NSEC_PER_USEC;
-	}
-	txc->freq	   = shift_right((s32)(time_freq >> PPM_SCALE_INV_SHIFT) *
-					 (s64)PPM_SCALE_INV,
-					 NTP_SCALE_SHIFT);
+	txc->freq	   = shift_right((time_freq >> PPM_SCALE_INV_SHIFT) *
+					 (s64)PPM_SCALE_INV, NTP_SCALE_SHIFT);
 	txc->maxerror	   = time_maxerror;
 	txc->esterror	   = time_esterror;
 	txc->status	   = time_status;
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index cb01cd8f919b..f98a1b7b16e9 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -384,6 +384,19 @@ int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
 }
 
 /*
+ * Called from irq_enter() when idle was interrupted to reenable the
+ * per cpu device.
+ */
+void tick_check_oneshot_broadcast(int cpu)
+{
+	if (cpu_isset(cpu, tick_broadcast_oneshot_mask)) {
+		struct tick_device *td = &per_cpu(tick_cpu_device, cpu);
+
+		clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_ONESHOT);
+	}
+}
+
+/*
  * Handle oneshot mode broadcasting
  */
 static void tick_handle_oneshot_broadcast(struct clock_event_device *dev)
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
index 469248782c23..b1c05bf75ee0 100644
--- a/kernel/time/tick-internal.h
+++ b/kernel/time/tick-internal.h
@@ -36,6 +36,7 @@ extern void tick_broadcast_switch_to_oneshot(void);
 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
 extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
 extern int tick_broadcast_oneshot_active(void);
+extern void tick_check_oneshot_broadcast(int cpu);
 # else /* BROADCAST */
 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
 {
@@ -45,6 +46,7 @@ static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
 static inline void tick_broadcast_switch_to_oneshot(void) { }
 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
 static inline int tick_broadcast_oneshot_active(void) { return 0; }
+static inline void tick_check_oneshot_broadcast(int cpu) { }
 # endif /* !BROADCAST */
 
 #else /* !ONESHOT */
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index a4d219398167..8f3fc2582d38 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -155,7 +155,7 @@ void tick_nohz_update_jiffies(void)
 	touch_softlockup_watchdog();
 }
 
-void tick_nohz_stop_idle(int cpu)
+static void tick_nohz_stop_idle(int cpu)
 {
 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
 
@@ -247,7 +247,7 @@ void tick_nohz_stop_sched_tick(int inidle)
 	if (need_resched())
 		goto end;
 
-	if (unlikely(local_softirq_pending())) {
+	if (unlikely(local_softirq_pending() && cpu_online(cpu))) {
 		static int ratelimit;
 
 		if (ratelimit < 10) {
@@ -270,7 +270,7 @@ void tick_nohz_stop_sched_tick(int inidle)
 	next_jiffies = get_next_timer_interrupt(last_jiffies);
 	delta_jiffies = next_jiffies - last_jiffies;
 
-	if (rcu_needs_cpu(cpu))
+	if (rcu_needs_cpu(cpu) || printk_needs_cpu(cpu))
 		delta_jiffies = 1;
 	/*
 	 * Do not stop the tick, if we are only one off
@@ -282,8 +282,31 @@ void tick_nohz_stop_sched_tick(int inidle)
 	/* Schedule the tick, if we are at least one jiffie off */
 	if ((long)delta_jiffies >= 1) {
 
+		/*
+		* calculate the expiry time for the next timer wheel
+		* timer
+		*/
+		expires = ktime_add_ns(last_update, tick_period.tv64 *
+				   delta_jiffies);
+
+		/*
+		 * If this cpu is the one which updates jiffies, then
+		 * give up the assignment and let it be taken by the
+		 * cpu which runs the tick timer next, which might be
+		 * this cpu as well. If we don't drop this here the
+		 * jiffies might be stale and do_timer() never
+		 * invoked.
+		 */
+		if (cpu == tick_do_timer_cpu)
+			tick_do_timer_cpu = TICK_DO_TIMER_NONE;
+
 		if (delta_jiffies > 1)
 			cpu_set(cpu, nohz_cpu_mask);
+
+		/* Skip reprogram of event if its not changed */
+		if (ts->tick_stopped && ktime_equal(expires, dev->next_event))
+			goto out;
+
 		/*
 		 * nohz_stop_sched_tick can be called several times before
 		 * the nohz_restart_sched_tick is called. This happens when
@@ -300,23 +323,12 @@ void tick_nohz_stop_sched_tick(int inidle)
 				goto out;
 			}
 
-			ts->idle_tick = ts->sched_timer.expires;
+			ts->idle_tick = hrtimer_get_expires(&ts->sched_timer);
 			ts->tick_stopped = 1;
 			ts->idle_jiffies = last_jiffies;
 			rcu_enter_nohz();
 		}
 
-		/*
-		 * If this cpu is the one which updates jiffies, then
-		 * give up the assignment and let it be taken by the
-		 * cpu which runs the tick timer next, which might be
-		 * this cpu as well. If we don't drop this here the
-		 * jiffies might be stale and do_timer() never
-		 * invoked.
-		 */
-		if (cpu == tick_do_timer_cpu)
-			tick_do_timer_cpu = TICK_DO_TIMER_NONE;
-
 		ts->idle_sleeps++;
 
 		/*
@@ -332,12 +344,7 @@ void tick_nohz_stop_sched_tick(int inidle)
 			goto out;
 		}
 
-		/*
-		 * calculate the expiry time for the next timer wheel
-		 * timer
-		 */
-		expires = ktime_add_ns(last_update, tick_period.tv64 *
-				       delta_jiffies);
+		/* Mark expiries */
 		ts->idle_expires = expires;
 
 		if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
@@ -377,6 +384,32 @@ ktime_t tick_nohz_get_sleep_length(void)
 	return ts->sleep_length;
 }
 
+static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)
+{
+	hrtimer_cancel(&ts->sched_timer);
+	hrtimer_set_expires(&ts->sched_timer, ts->idle_tick);
+
+	while (1) {
+		/* Forward the time to expire in the future */
+		hrtimer_forward(&ts->sched_timer, now, tick_period);
+
+		if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
+			hrtimer_start_expires(&ts->sched_timer,
+				      HRTIMER_MODE_ABS);
+			/* Check, if the timer was already in the past */
+			if (hrtimer_active(&ts->sched_timer))
+				break;
+		} else {
+			if (!tick_program_event(
+				hrtimer_get_expires(&ts->sched_timer), 0))
+				break;
+		}
+		/* Update jiffies and reread time */
+		tick_do_update_jiffies64(now);
+		now = ktime_get();
+	}
+}
+
 /**
  * tick_nohz_restart_sched_tick - restart the idle tick from the idle task
  *
@@ -430,35 +463,16 @@ void tick_nohz_restart_sched_tick(void)
 	 */
 	ts->tick_stopped  = 0;
 	ts->idle_exittime = now;
-	hrtimer_cancel(&ts->sched_timer);
-	ts->sched_timer.expires = ts->idle_tick;
 
-	while (1) {
-		/* Forward the time to expire in the future */
-		hrtimer_forward(&ts->sched_timer, now, tick_period);
+	tick_nohz_restart(ts, now);
 
-		if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
-			hrtimer_start(&ts->sched_timer,
-				      ts->sched_timer.expires,
-				      HRTIMER_MODE_ABS);
-			/* Check, if the timer was already in the past */
-			if (hrtimer_active(&ts->sched_timer))
-				break;
-		} else {
-			if (!tick_program_event(ts->sched_timer.expires, 0))
-				break;
-		}
-		/* Update jiffies and reread time */
-		tick_do_update_jiffies64(now);
-		now = ktime_get();
-	}
 	local_irq_enable();
 }
 
 static int tick_nohz_reprogram(struct tick_sched *ts, ktime_t now)
 {
 	hrtimer_forward(&ts->sched_timer, now, tick_period);
-	return tick_program_event(ts->sched_timer.expires, 0);
+	return tick_program_event(hrtimer_get_expires(&ts->sched_timer), 0);
 }
 
 /*
@@ -503,10 +517,6 @@ static void tick_nohz_handler(struct clock_event_device *dev)
 	update_process_times(user_mode(regs));
 	profile_tick(CPU_PROFILING);
 
-	/* Do not restart, when we are in the idle loop */
-	if (ts->tick_stopped)
-		return;
-
 	while (tick_nohz_reprogram(ts, now)) {
 		now = ktime_get();
 		tick_do_update_jiffies64(now);
@@ -541,7 +551,7 @@ static void tick_nohz_switch_to_nohz(void)
 	next = tick_init_jiffy_update();
 
 	for (;;) {
-		ts->sched_timer.expires = next;
+		hrtimer_set_expires(&ts->sched_timer, next);
 		if (!tick_program_event(next, 0))
 			break;
 		next = ktime_add(next, tick_period);
@@ -552,6 +562,41 @@ static void tick_nohz_switch_to_nohz(void)
 	       smp_processor_id());
 }
 
+/*
+ * When NOHZ is enabled and the tick is stopped, we need to kick the
+ * tick timer from irq_enter() so that the jiffies update is kept
+ * alive during long running softirqs. That's ugly as hell, but
+ * correctness is key even if we need to fix the offending softirq in
+ * the first place.
+ *
+ * Note, this is different to tick_nohz_restart. We just kick the
+ * timer and do not touch the other magic bits which need to be done
+ * when idle is left.
+ */
+static void tick_nohz_kick_tick(int cpu)
+{
+#if 0
+	/* Switch back to 2.6.27 behaviour */
+
+	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
+	ktime_t delta, now;
+
+	if (!ts->tick_stopped)
+		return;
+
+	/*
+	 * Do not touch the tick device, when the next expiry is either
+	 * already reached or less/equal than the tick period.
+	 */
+	now = ktime_get();
+	delta =	ktime_sub(hrtimer_get_expires(&ts->sched_timer), now);
+	if (delta.tv64 <= tick_period.tv64)
+		return;
+
+	tick_nohz_restart(ts, now);
+#endif
+}
+
 #else
 
 static inline void tick_nohz_switch_to_nohz(void) { }
@@ -559,6 +604,19 @@ static inline void tick_nohz_switch_to_nohz(void) { }
 #endif /* NO_HZ */
 
 /*
+ * Called from irq_enter to notify about the possible interruption of idle()
+ */
+void tick_check_idle(int cpu)
+{
+	tick_check_oneshot_broadcast(cpu);
+#ifdef CONFIG_NO_HZ
+	tick_nohz_stop_idle(cpu);
+	tick_nohz_update_jiffies();
+	tick_nohz_kick_tick(cpu);
+#endif
+}
+
+/*
  * High resolution timer specific code
  */
 #ifdef CONFIG_HIGH_RES_TIMERS
@@ -611,10 +669,6 @@ static enum hrtimer_restart tick_sched_timer(struct hrtimer *timer)
 		profile_tick(CPU_PROFILING);
 	}
 
-	/* Do not restart, when we are in the idle loop */
-	if (ts->tick_stopped)
-		return HRTIMER_NORESTART;
-
 	hrtimer_forward(timer, now, tick_period);
 
 	return HRTIMER_RESTART;
@@ -634,19 +688,17 @@ void tick_setup_sched_timer(void)
 	 */
 	hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
 	ts->sched_timer.function = tick_sched_timer;
-	ts->sched_timer.cb_mode = HRTIMER_CB_IRQSAFE_PERCPU;
 
 	/* Get the next period (per cpu) */
-	ts->sched_timer.expires = tick_init_jiffy_update();
+	hrtimer_set_expires(&ts->sched_timer, tick_init_jiffy_update());
 	offset = ktime_to_ns(tick_period) >> 1;
 	do_div(offset, num_possible_cpus());
 	offset *= smp_processor_id();
-	ts->sched_timer.expires = ktime_add_ns(ts->sched_timer.expires, offset);
+	hrtimer_add_expires_ns(&ts->sched_timer, offset);
 
 	for (;;) {
 		hrtimer_forward(&ts->sched_timer, now, tick_period);
-		hrtimer_start(&ts->sched_timer, ts->sched_timer.expires,
-			      HRTIMER_MODE_ABS);
+		hrtimer_start_expires(&ts->sched_timer, HRTIMER_MODE_ABS);
 		/* Check, if the timer was already in the past */
 		if (hrtimer_active(&ts->sched_timer))
 			break;
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index e91c29f961c9..fa05e88aa76f 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -58,27 +58,26 @@ struct clocksource *clock;
 
 #ifdef CONFIG_GENERIC_TIME
 /**
- * __get_nsec_offset - Returns nanoseconds since last call to periodic_hook
+ * clocksource_forward_now - update clock to the current time
  *
- * private function, must hold xtime_lock lock when being
- * called. Returns the number of nanoseconds since the
- * last call to update_wall_time() (adjusted by NTP scaling)
+ * Forward the current clock to update its state since the last call to
+ * update_wall_time(). This is useful before significant clock changes,
+ * as it avoids having to deal with this time offset explicitly.
  */
-static inline s64 __get_nsec_offset(void)
+static void clocksource_forward_now(void)
 {
 	cycle_t cycle_now, cycle_delta;
-	s64 ns_offset;
+	s64 nsec;
 
-	/* read clocksource: */
 	cycle_now = clocksource_read(clock);
-
-	/* calculate the delta since the last update_wall_time: */
 	cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
+	clock->cycle_last = cycle_now;
 
-	/* convert to nanoseconds: */
-	ns_offset = cyc2ns(clock, cycle_delta);
+	nsec = cyc2ns(clock, cycle_delta);
+	timespec_add_ns(&xtime, nsec);
 
-	return ns_offset;
+	nsec = ((s64)cycle_delta * clock->mult_orig) >> clock->shift;
+	clock->raw_time.tv_nsec += nsec;
 }
 
 /**
@@ -89,6 +88,7 @@ static inline s64 __get_nsec_offset(void)
  */
 void getnstimeofday(struct timespec *ts)
 {
+	cycle_t cycle_now, cycle_delta;
 	unsigned long seq;
 	s64 nsecs;
 
@@ -96,7 +96,15 @@ void getnstimeofday(struct timespec *ts)
 		seq = read_seqbegin(&xtime_lock);
 
 		*ts = xtime;
-		nsecs = __get_nsec_offset();
+
+		/* read clocksource: */
+		cycle_now = clocksource_read(clock);
+
+		/* calculate the delta since the last update_wall_time: */
+		cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
+
+		/* convert to nanoseconds: */
+		nsecs = cyc2ns(clock, cycle_delta);
 
 	} while (read_seqretry(&xtime_lock, seq));
 
@@ -129,22 +137,22 @@ EXPORT_SYMBOL(do_gettimeofday);
  */
 int do_settimeofday(struct timespec *tv)
 {
+	struct timespec ts_delta;
 	unsigned long flags;
-	time_t wtm_sec, sec = tv->tv_sec;
-	long wtm_nsec, nsec = tv->tv_nsec;
 
 	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
 		return -EINVAL;
 
 	write_seqlock_irqsave(&xtime_lock, flags);
 
-	nsec -= __get_nsec_offset();
+	clocksource_forward_now();
 
-	wtm_sec  = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
-	wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
+	ts_delta.tv_sec = tv->tv_sec - xtime.tv_sec;
+	ts_delta.tv_nsec = tv->tv_nsec - xtime.tv_nsec;
+	wall_to_monotonic = timespec_sub(wall_to_monotonic, ts_delta);
+
+	xtime = *tv;
 
-	set_normalized_timespec(&xtime, sec, nsec);
-	set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
 	update_xtime_cache(0);
 
 	clock->error = 0;
@@ -170,22 +178,19 @@ EXPORT_SYMBOL(do_settimeofday);
 static void change_clocksource(void)
 {
 	struct clocksource *new;
-	cycle_t now;
-	u64 nsec;
 
 	new = clocksource_get_next();
 
 	if (clock == new)
 		return;
 
-	new->cycle_last = 0;
-	now = clocksource_read(new);
-	nsec =  __get_nsec_offset();
-	timespec_add_ns(&xtime, nsec);
+	clocksource_forward_now();
 
-	clock = new;
-	clock->cycle_last = now;
+	new->raw_time = clock->raw_time;
 
+	clock = new;
+	clock->cycle_last = 0;
+	clock->cycle_last = clocksource_read(new);
 	clock->error = 0;
 	clock->xtime_nsec = 0;
 	clocksource_calculate_interval(clock, NTP_INTERVAL_LENGTH);
@@ -200,11 +205,44 @@ static void change_clocksource(void)
 	 */
 }
 #else
+static inline void clocksource_forward_now(void) { }
 static inline void change_clocksource(void) { }
-static inline s64 __get_nsec_offset(void) { return 0; }
 #endif
 
 /**
+ * getrawmonotonic - Returns the raw monotonic time in a timespec
+ * @ts:		pointer to the timespec to be set
+ *
+ * Returns the raw monotonic time (completely un-modified by ntp)
+ */
+void getrawmonotonic(struct timespec *ts)
+{
+	unsigned long seq;
+	s64 nsecs;
+	cycle_t cycle_now, cycle_delta;
+
+	do {
+		seq = read_seqbegin(&xtime_lock);
+
+		/* read clocksource: */
+		cycle_now = clocksource_read(clock);
+
+		/* calculate the delta since the last update_wall_time: */
+		cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
+
+		/* convert to nanoseconds: */
+		nsecs = ((s64)cycle_delta * clock->mult_orig) >> clock->shift;
+
+		*ts = clock->raw_time;
+
+	} while (read_seqretry(&xtime_lock, seq));
+
+	timespec_add_ns(ts, nsecs);
+}
+EXPORT_SYMBOL(getrawmonotonic);
+
+
+/**
  * timekeeping_valid_for_hres - Check if timekeeping is suitable for hres
  */
 int timekeeping_valid_for_hres(void)
@@ -265,8 +303,6 @@ void __init timekeeping_init(void)
 static int timekeeping_suspended;
 /* time in seconds when suspend began */
 static unsigned long timekeeping_suspend_time;
-/* xtime offset when we went into suspend */
-static s64 timekeeping_suspend_nsecs;
 
 /**
  * timekeeping_resume - Resumes the generic timekeeping subsystem.
@@ -292,8 +328,6 @@ static int timekeeping_resume(struct sys_device *dev)
 		wall_to_monotonic.tv_sec -= sleep_length;
 		total_sleep_time += sleep_length;
 	}
-	/* Make sure that we have the correct xtime reference */
-	timespec_add_ns(&xtime, timekeeping_suspend_nsecs);
 	update_xtime_cache(0);
 	/* re-base the last cycle value */
 	clock->cycle_last = 0;
@@ -319,8 +353,7 @@ static int timekeeping_suspend(struct sys_device *dev, pm_message_t state)
 	timekeeping_suspend_time = read_persistent_clock();
 
 	write_seqlock_irqsave(&xtime_lock, flags);
-	/* Get the current xtime offset */
-	timekeeping_suspend_nsecs = __get_nsec_offset();
+	clocksource_forward_now();
 	timekeeping_suspended = 1;
 	write_sequnlock_irqrestore(&xtime_lock, flags);
 
@@ -454,23 +487,29 @@ void update_wall_time(void)
 #else
 	offset = clock->cycle_interval;
 #endif
-	clock->xtime_nsec += (s64)xtime.tv_nsec << clock->shift;
+	clock->xtime_nsec = (s64)xtime.tv_nsec << clock->shift;
 
 	/* normally this loop will run just once, however in the
 	 * case of lost or late ticks, it will accumulate correctly.
 	 */
 	while (offset >= clock->cycle_interval) {
 		/* accumulate one interval */
-		clock->xtime_nsec += clock->xtime_interval;
-		clock->cycle_last += clock->cycle_interval;
 		offset -= clock->cycle_interval;
+		clock->cycle_last += clock->cycle_interval;
 
+		clock->xtime_nsec += clock->xtime_interval;
 		if (clock->xtime_nsec >= (u64)NSEC_PER_SEC << clock->shift) {
 			clock->xtime_nsec -= (u64)NSEC_PER_SEC << clock->shift;
 			xtime.tv_sec++;
 			second_overflow();
 		}
 
+		clock->raw_time.tv_nsec += clock->raw_interval;
+		if (clock->raw_time.tv_nsec >= NSEC_PER_SEC) {
+			clock->raw_time.tv_nsec -= NSEC_PER_SEC;
+			clock->raw_time.tv_sec++;
+		}
+
 		/* accumulate error between NTP and clock interval */
 		clock->error += tick_length;
 		clock->error -= clock->xtime_interval << (NTP_SCALE_SHIFT - clock->shift);
@@ -479,9 +518,34 @@ void update_wall_time(void)
 	/* correct the clock when NTP error is too big */
 	clocksource_adjust(offset);
 
-	/* store full nanoseconds into xtime */
-	xtime.tv_nsec = (s64)clock->xtime_nsec >> clock->shift;
+	/*
+	 * Since in the loop above, we accumulate any amount of time
+	 * in xtime_nsec over a second into xtime.tv_sec, its possible for
+	 * xtime_nsec to be fairly small after the loop. Further, if we're
+	 * slightly speeding the clocksource up in clocksource_adjust(),
+	 * its possible the required corrective factor to xtime_nsec could
+	 * cause it to underflow.
+	 *
+	 * Now, we cannot simply roll the accumulated second back, since
+	 * the NTP subsystem has been notified via second_overflow. So
+	 * instead we push xtime_nsec forward by the amount we underflowed,
+	 * and add that amount into the error.
+	 *
+	 * We'll correct this error next time through this function, when
+	 * xtime_nsec is not as small.
+	 */
+	if (unlikely((s64)clock->xtime_nsec < 0)) {
+		s64 neg = -(s64)clock->xtime_nsec;
+		clock->xtime_nsec = 0;
+		clock->error += neg << (NTP_SCALE_SHIFT - clock->shift);
+	}
+
+	/* store full nanoseconds into xtime after rounding it up and
+	 * add the remainder to the error difference.
+	 */
+	xtime.tv_nsec = ((s64)clock->xtime_nsec >> clock->shift) + 1;
 	clock->xtime_nsec -= (s64)xtime.tv_nsec << clock->shift;
+	clock->error += clock->xtime_nsec << (NTP_SCALE_SHIFT - clock->shift);
 
 	update_xtime_cache(cyc2ns(clock, offset));
 
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index a40e20fd0001..a999b92a1277 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -47,13 +47,14 @@ static void print_name_offset(struct seq_file *m, void *sym)
 }
 
 static void
-print_timer(struct seq_file *m, struct hrtimer *timer, int idx, u64 now)
+print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
+	    int idx, u64 now)
 {
 #ifdef CONFIG_TIMER_STATS
 	char tmp[TASK_COMM_LEN + 1];
 #endif
 	SEQ_printf(m, " #%d: ", idx);
-	print_name_offset(m, timer);
+	print_name_offset(m, taddr);
 	SEQ_printf(m, ", ");
 	print_name_offset(m, timer->function);
 	SEQ_printf(m, ", S:%02lx", timer->state);
@@ -65,9 +66,11 @@ print_timer(struct seq_file *m, struct hrtimer *timer, int idx, u64 now)
 	SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
 #endif
 	SEQ_printf(m, "\n");
-	SEQ_printf(m, " # expires at %Lu nsecs [in %Ld nsecs]\n",
-		(unsigned long long)ktime_to_ns(timer->expires),
-		(long long)(ktime_to_ns(timer->expires) - now));
+	SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
+		(unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
+		(unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
+		(long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
+		(long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
 }
 
 static void
@@ -99,7 +102,7 @@ next_one:
 		tmp = *timer;
 		spin_unlock_irqrestore(&base->cpu_base->lock, flags);
 
-		print_timer(m, &tmp, i, now);
+		print_timer(m, timer, &tmp, i, now);
 		next++;
 		goto next_one;
 	}
@@ -109,6 +112,7 @@ next_one:
 static void
 print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
 {
+	SEQ_printf(m, "  .base:       %p\n", base);
 	SEQ_printf(m, "  .index:      %d\n",
 			base->index);
 	SEQ_printf(m, "  .resolution: %Lu nsecs\n",
@@ -183,12 +187,16 @@ static void print_cpu(struct seq_file *m, int cpu, u64 now)
 
 #ifdef CONFIG_GENERIC_CLOCKEVENTS
 static void
-print_tickdevice(struct seq_file *m, struct tick_device *td)
+print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
 {
 	struct clock_event_device *dev = td->evtdev;
 
 	SEQ_printf(m, "\n");
 	SEQ_printf(m, "Tick Device: mode:     %d\n", td->mode);
+	if (cpu < 0)
+		SEQ_printf(m, "Broadcast device\n");
+	else
+		SEQ_printf(m, "Per CPU device: %d\n", cpu);
 
 	SEQ_printf(m, "Clock Event Device: ");
 	if (!dev) {
@@ -222,7 +230,7 @@ static void timer_list_show_tickdevices(struct seq_file *m)
 	int cpu;
 
 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
-	print_tickdevice(m, tick_get_broadcast_device());
+	print_tickdevice(m, tick_get_broadcast_device(), -1);
 	SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
 		   tick_get_broadcast_mask()->bits[0]);
 #ifdef CONFIG_TICK_ONESHOT
@@ -232,7 +240,7 @@ static void timer_list_show_tickdevices(struct seq_file *m)
 	SEQ_printf(m, "\n");
 #endif
 	for_each_online_cpu(cpu)
-		   print_tickdevice(m, tick_get_device(cpu));
+		print_tickdevice(m, tick_get_device(cpu), cpu);
 	SEQ_printf(m, "\n");
 }
 #else
@@ -244,7 +252,7 @@ static int timer_list_show(struct seq_file *m, void *v)
 	u64 now = ktime_to_ns(ktime_get());
 	int cpu;
 
-	SEQ_printf(m, "Timer List Version: v0.3\n");
+	SEQ_printf(m, "Timer List Version: v0.4\n");
 	SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
 	SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
 
diff --git a/kernel/timer.c b/kernel/timer.c
index 03bc7f1f1593..566257d1dc10 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -112,27 +112,8 @@ timer_set_base(struct timer_list *timer, struct tvec_base *new_base)
 				      tbase_get_deferrable(timer->base));
 }
 
-/**
- * __round_jiffies - function to round jiffies to a full second
- * @j: the time in (absolute) jiffies that should be rounded
- * @cpu: the processor number on which the timeout will happen
- *
- * __round_jiffies() rounds an absolute time in the future (in jiffies)
- * up or down to (approximately) full seconds. This is useful for timers
- * for which the exact time they fire does not matter too much, as long as
- * they fire approximately every X seconds.
- *
- * By rounding these timers to whole seconds, all such timers will fire
- * at the same time, rather than at various times spread out. The goal
- * of this is to have the CPU wake up less, which saves power.
- *
- * The exact rounding is skewed for each processor to avoid all
- * processors firing at the exact same time, which could lead
- * to lock contention or spurious cache line bouncing.
- *
- * The return value is the rounded version of the @j parameter.
- */
-unsigned long __round_jiffies(unsigned long j, int cpu)
+static unsigned long round_jiffies_common(unsigned long j, int cpu,
+		bool force_up)
 {
 	int rem;
 	unsigned long original = j;
@@ -154,8 +135,9 @@ unsigned long __round_jiffies(unsigned long j, int cpu)
 	 * due to delays of the timer irq, long irq off times etc etc) then
 	 * we should round down to the whole second, not up. Use 1/4th second
 	 * as cutoff for this rounding as an extreme upper bound for this.
+	 * But never round down if @force_up is set.
 	 */
-	if (rem < HZ/4) /* round down */
+	if (rem < HZ/4 && !force_up) /* round down */
 		j = j - rem;
 	else /* round up */
 		j = j - rem + HZ;
@@ -167,6 +149,31 @@ unsigned long __round_jiffies(unsigned long j, int cpu)
 		return original;
 	return j;
 }
+
+/**
+ * __round_jiffies - function to round jiffies to a full second
+ * @j: the time in (absolute) jiffies that should be rounded
+ * @cpu: the processor number on which the timeout will happen
+ *
+ * __round_jiffies() rounds an absolute time in the future (in jiffies)
+ * up or down to (approximately) full seconds. This is useful for timers
+ * for which the exact time they fire does not matter too much, as long as
+ * they fire approximately every X seconds.
+ *
+ * By rounding these timers to whole seconds, all such timers will fire
+ * at the same time, rather than at various times spread out. The goal
+ * of this is to have the CPU wake up less, which saves power.
+ *
+ * The exact rounding is skewed for each processor to avoid all
+ * processors firing at the exact same time, which could lead
+ * to lock contention or spurious cache line bouncing.
+ *
+ * The return value is the rounded version of the @j parameter.
+ */
+unsigned long __round_jiffies(unsigned long j, int cpu)
+{
+	return round_jiffies_common(j, cpu, false);
+}
 EXPORT_SYMBOL_GPL(__round_jiffies);
 
 /**
@@ -191,13 +198,10 @@ EXPORT_SYMBOL_GPL(__round_jiffies);
  */
 unsigned long __round_jiffies_relative(unsigned long j, int cpu)
 {
-	/*
-	 * In theory the following code can skip a jiffy in case jiffies
-	 * increments right between the addition and the later subtraction.
-	 * However since the entire point of this function is to use approximate
-	 * timeouts, it's entirely ok to not handle that.
-	 */
-	return  __round_jiffies(j + jiffies, cpu) - jiffies;
+	unsigned long j0 = jiffies;
+
+	/* Use j0 because jiffies might change while we run */
+	return round_jiffies_common(j + j0, cpu, false) - j0;
 }
 EXPORT_SYMBOL_GPL(__round_jiffies_relative);
 
@@ -218,7 +222,7 @@ EXPORT_SYMBOL_GPL(__round_jiffies_relative);
  */
 unsigned long round_jiffies(unsigned long j)
 {
-	return __round_jiffies(j, raw_smp_processor_id());
+	return round_jiffies_common(j, raw_smp_processor_id(), false);
 }
 EXPORT_SYMBOL_GPL(round_jiffies);
 
@@ -243,6 +247,71 @@ unsigned long round_jiffies_relative(unsigned long j)
 }
 EXPORT_SYMBOL_GPL(round_jiffies_relative);
 
+/**
+ * __round_jiffies_up - function to round jiffies up to a full second
+ * @j: the time in (absolute) jiffies that should be rounded
+ * @cpu: the processor number on which the timeout will happen
+ *
+ * This is the same as __round_jiffies() except that it will never
+ * round down.  This is useful for timeouts for which the exact time
+ * of firing does not matter too much, as long as they don't fire too
+ * early.
+ */
+unsigned long __round_jiffies_up(unsigned long j, int cpu)
+{
+	return round_jiffies_common(j, cpu, true);
+}
+EXPORT_SYMBOL_GPL(__round_jiffies_up);
+
+/**
+ * __round_jiffies_up_relative - function to round jiffies up to a full second
+ * @j: the time in (relative) jiffies that should be rounded
+ * @cpu: the processor number on which the timeout will happen
+ *
+ * This is the same as __round_jiffies_relative() except that it will never
+ * round down.  This is useful for timeouts for which the exact time
+ * of firing does not matter too much, as long as they don't fire too
+ * early.
+ */
+unsigned long __round_jiffies_up_relative(unsigned long j, int cpu)
+{
+	unsigned long j0 = jiffies;
+
+	/* Use j0 because jiffies might change while we run */
+	return round_jiffies_common(j + j0, cpu, true) - j0;
+}
+EXPORT_SYMBOL_GPL(__round_jiffies_up_relative);
+
+/**
+ * round_jiffies_up - function to round jiffies up to a full second
+ * @j: the time in (absolute) jiffies that should be rounded
+ *
+ * This is the same as round_jiffies() except that it will never
+ * round down.  This is useful for timeouts for which the exact time
+ * of firing does not matter too much, as long as they don't fire too
+ * early.
+ */
+unsigned long round_jiffies_up(unsigned long j)
+{
+	return round_jiffies_common(j, raw_smp_processor_id(), true);
+}
+EXPORT_SYMBOL_GPL(round_jiffies_up);
+
+/**
+ * round_jiffies_up_relative - function to round jiffies up to a full second
+ * @j: the time in (relative) jiffies that should be rounded
+ *
+ * This is the same as round_jiffies_relative() except that it will never
+ * round down.  This is useful for timeouts for which the exact time
+ * of firing does not matter too much, as long as they don't fire too
+ * early.
+ */
+unsigned long round_jiffies_up_relative(unsigned long j)
+{
+	return __round_jiffies_up_relative(j, raw_smp_processor_id());
+}
+EXPORT_SYMBOL_GPL(round_jiffies_up_relative);
+
 
 static inline void set_running_timer(struct tvec_base *base,
 					struct timer_list *timer)
@@ -978,6 +1047,7 @@ void update_process_times(int user_tick)
 	run_local_timers();
 	if (rcu_pending(cpu))
 		rcu_check_callbacks(cpu, user_tick);
+	printk_tick();
 	scheduler_tick();
 	run_posix_cpu_timers(p);
 }
@@ -1122,25 +1192,25 @@ asmlinkage long sys_getppid(void)
 asmlinkage long sys_getuid(void)
 {
 	/* Only we change this so SMP safe */
-	return current->uid;
+	return current_uid();
 }
 
 asmlinkage long sys_geteuid(void)
 {
 	/* Only we change this so SMP safe */
-	return current->euid;
+	return current_euid();
 }
 
 asmlinkage long sys_getgid(void)
 {
 	/* Only we change this so SMP safe */
-	return current->gid;
+	return current_gid();
 }
 
 asmlinkage long sys_getegid(void)
 {
 	/* Only we change this so SMP safe */
-	return  current->egid;
+	return  current_egid();
 }
 
 #endif
@@ -1435,9 +1505,11 @@ static void __cpuinit migrate_timers(int cpu)
 	BUG_ON(cpu_online(cpu));
 	old_base = per_cpu(tvec_bases, cpu);
 	new_base = get_cpu_var(tvec_bases);
-
-	local_irq_disable();
-	spin_lock(&new_base->lock);
+	/*
+	 * The caller is globally serialized and nobody else
+	 * takes two locks at once, deadlock is not possible.
+	 */
+	spin_lock_irq(&new_base->lock);
 	spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
 
 	BUG_ON(old_base->running_timer);
@@ -1452,8 +1524,7 @@ static void __cpuinit migrate_timers(int cpu)
 	}
 
 	spin_unlock(&old_base->lock);
-	spin_unlock(&new_base->lock);
-	local_irq_enable();
+	spin_unlock_irq(&new_base->lock);
 	put_cpu_var(tvec_bases);
 }
 #endif /* CONFIG_HOTPLUG_CPU */
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 263e9e6bbd60..e2a4ff6fc3a6 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -1,23 +1,56 @@
 #
-# Architectures that offer an FTRACE implementation should select HAVE_FTRACE:
+# Architectures that offer an FUNCTION_TRACER implementation should
+#  select HAVE_FUNCTION_TRACER:
 #
-config HAVE_FTRACE
+
+config USER_STACKTRACE_SUPPORT
+	bool
+
+config NOP_TRACER
+	bool
+
+config HAVE_FUNCTION_TRACER
+	bool
+
+config HAVE_FUNCTION_GRAPH_TRACER
+	bool
+
+config HAVE_FUNCTION_TRACE_MCOUNT_TEST
 	bool
+	help
+	 This gets selected when the arch tests the function_trace_stop
+	 variable at the mcount call site. Otherwise, this variable
+	 is tested by the called function.
 
 config HAVE_DYNAMIC_FTRACE
 	bool
 
+config HAVE_FTRACE_MCOUNT_RECORD
+	bool
+
+config HAVE_HW_BRANCH_TRACER
+	bool
+
 config TRACER_MAX_TRACE
 	bool
 
+config RING_BUFFER
+	bool
+
 config TRACING
 	bool
 	select DEBUG_FS
-	select STACKTRACE
+	select RING_BUFFER
+	select STACKTRACE if STACKTRACE_SUPPORT
+	select TRACEPOINTS
+	select NOP_TRACER
+
+menu "Tracers"
 
-config FTRACE
+config FUNCTION_TRACER
 	bool "Kernel Function Tracer"
-	depends on HAVE_FTRACE
+	depends on HAVE_FUNCTION_TRACER
+	depends on DEBUG_KERNEL
 	select FRAME_POINTER
 	select TRACING
 	select CONTEXT_SWITCH_TRACER
@@ -30,12 +63,26 @@ config FTRACE
 	  (the bootup default), then the overhead of the instructions is very
 	  small and not measurable even in micro-benchmarks.
 
+config FUNCTION_GRAPH_TRACER
+	bool "Kernel Function Graph Tracer"
+	depends on HAVE_FUNCTION_GRAPH_TRACER
+	depends on FUNCTION_TRACER
+	default y
+	help
+	  Enable the kernel to trace a function at both its return
+	  and its entry.
+	  It's first purpose is to trace the duration of functions and
+	  draw a call graph for each thread with some informations like
+	  the return value.
+	  This is done by setting the current return address on the current
+	  task structure into a stack of calls.
+
 config IRQSOFF_TRACER
 	bool "Interrupts-off Latency Tracer"
 	default n
 	depends on TRACE_IRQFLAGS_SUPPORT
 	depends on GENERIC_TIME
-	depends on HAVE_FTRACE
+	depends on DEBUG_KERNEL
 	select TRACE_IRQFLAGS
 	select TRACING
 	select TRACER_MAX_TRACE
@@ -58,7 +105,7 @@ config PREEMPT_TRACER
 	default n
 	depends on GENERIC_TIME
 	depends on PREEMPT
-	depends on HAVE_FTRACE
+	depends on DEBUG_KERNEL
 	select TRACING
 	select TRACER_MAX_TRACE
 	help
@@ -85,7 +132,7 @@ config SYSPROF_TRACER
 
 config SCHED_TRACER
 	bool "Scheduling Latency Tracer"
-	depends on HAVE_FTRACE
+	depends on DEBUG_KERNEL
 	select TRACING
 	select CONTEXT_SWITCH_TRACER
 	select TRACER_MAX_TRACE
@@ -95,17 +142,133 @@ config SCHED_TRACER
 
 config CONTEXT_SWITCH_TRACER
 	bool "Trace process context switches"
-	depends on HAVE_FTRACE
+	depends on DEBUG_KERNEL
 	select TRACING
 	select MARKERS
 	help
 	  This tracer gets called from the context switch and records
 	  all switching of tasks.
 
+config BOOT_TRACER
+	bool "Trace boot initcalls"
+	depends on DEBUG_KERNEL
+	select TRACING
+	select CONTEXT_SWITCH_TRACER
+	help
+	  This tracer helps developers to optimize boot times: it records
+	  the timings of the initcalls and traces key events and the identity
+	  of tasks that can cause boot delays, such as context-switches.
+
+	  Its aim is to be parsed by the /scripts/bootgraph.pl tool to
+	  produce pretty graphics about boot inefficiencies, giving a visual
+	  representation of the delays during initcalls - but the raw
+	  /debug/tracing/trace text output is readable too.
+
+	  ( Note that tracing self tests can't be enabled if this tracer is
+	    selected, because the self-tests are an initcall as well and that
+	    would invalidate the boot trace. )
+
+config TRACE_BRANCH_PROFILING
+	bool "Trace likely/unlikely profiler"
+	depends on DEBUG_KERNEL
+	select TRACING
+	help
+	  This tracer profiles all the the likely and unlikely macros
+	  in the kernel. It will display the results in:
+
+	  /debugfs/tracing/profile_annotated_branch
+
+	  Note: this will add a significant overhead, only turn this
+	  on if you need to profile the system's use of these macros.
+
+	  Say N if unsure.
+
+config PROFILE_ALL_BRANCHES
+	bool "Profile all if conditionals"
+	depends on TRACE_BRANCH_PROFILING
+	help
+	  This tracer profiles all branch conditions. Every if ()
+	  taken in the kernel is recorded whether it hit or miss.
+	  The results will be displayed in:
+
+	  /debugfs/tracing/profile_branch
+
+	  This configuration, when enabled, will impose a great overhead
+	  on the system. This should only be enabled when the system
+	  is to be analyzed
+
+	  Say N if unsure.
+
+config TRACING_BRANCHES
+	bool
+	help
+	  Selected by tracers that will trace the likely and unlikely
+	  conditions. This prevents the tracers themselves from being
+	  profiled. Profiling the tracing infrastructure can only happen
+	  when the likelys and unlikelys are not being traced.
+
+config BRANCH_TRACER
+	bool "Trace likely/unlikely instances"
+	depends on TRACE_BRANCH_PROFILING
+	select TRACING_BRANCHES
+	help
+	  This traces the events of likely and unlikely condition
+	  calls in the kernel.  The difference between this and the
+	  "Trace likely/unlikely profiler" is that this is not a
+	  histogram of the callers, but actually places the calling
+	  events into a running trace buffer to see when and where the
+	  events happened, as well as their results.
+
+	  Say N if unsure.
+
+config POWER_TRACER
+	bool "Trace power consumption behavior"
+	depends on DEBUG_KERNEL
+	depends on X86
+	select TRACING
+	help
+	  This tracer helps developers to analyze and optimize the kernels
+	  power management decisions, specifically the C-state and P-state
+	  behavior.
+
+
+config STACK_TRACER
+	bool "Trace max stack"
+	depends on HAVE_FUNCTION_TRACER
+	depends on DEBUG_KERNEL
+	select FUNCTION_TRACER
+	select STACKTRACE
+	help
+	  This special tracer records the maximum stack footprint of the
+	  kernel and displays it in debugfs/tracing/stack_trace.
+
+	  This tracer works by hooking into every function call that the
+	  kernel executes, and keeping a maximum stack depth value and
+	  stack-trace saved.  If this is configured with DYNAMIC_FTRACE
+	  then it will not have any overhead while the stack tracer
+	  is disabled.
+
+	  To enable the stack tracer on bootup, pass in 'stacktrace'
+	  on the kernel command line.
+
+	  The stack tracer can also be enabled or disabled via the
+	  sysctl kernel.stack_tracer_enabled
+
+	  Say N if unsure.
+
+config HW_BRANCH_TRACER
+	depends on HAVE_HW_BRANCH_TRACER
+	bool "Trace hw branches"
+	select TRACING
+	help
+	  This tracer records all branches on the system in a circular
+	  buffer giving access to the last N branches for each cpu.
+
 config DYNAMIC_FTRACE
 	bool "enable/disable ftrace tracepoints dynamically"
-	depends on FTRACE
+	depends on FUNCTION_TRACER
 	depends on HAVE_DYNAMIC_FTRACE
+	depends on DEBUG_KERNEL
 	default y
 	help
          This option will modify all the calls to ftrace dynamically
@@ -113,7 +276,7 @@ config DYNAMIC_FTRACE
 	 with a No-Op instruction) as they are called. A table is
 	 created to dynamically enable them again.
 
-	 This way a CONFIG_FTRACE kernel is slightly larger, but otherwise
+	 This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but otherwise
 	 has native performance as long as no tracing is active.
 
 	 The changes to the code are done by a kernel thread that
@@ -121,15 +284,22 @@ config DYNAMIC_FTRACE
 	 were made. If so, it runs stop_machine (stops all CPUS)
 	 and modifies the code to jump over the call to ftrace.
 
+config FTRACE_MCOUNT_RECORD
+	def_bool y
+	depends on DYNAMIC_FTRACE
+	depends on HAVE_FTRACE_MCOUNT_RECORD
+
 config FTRACE_SELFTEST
 	bool
 
 config FTRACE_STARTUP_TEST
 	bool "Perform a startup test on ftrace"
-	depends on TRACING
+	depends on TRACING && DEBUG_KERNEL && !BOOT_TRACER
 	select FTRACE_SELFTEST
 	help
 	  This option performs a series of startup tests on ftrace. On bootup
 	  a series of tests are made to verify that the tracer is
 	  functioning properly. It will do tests on all the configured
 	  tracers of ftrace.
+
+endmenu
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 71d17de17288..349d5a93653f 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -1,7 +1,7 @@
 
 # Do not instrument the tracer itself:
 
-ifdef CONFIG_FTRACE
+ifdef CONFIG_FUNCTION_TRACER
 ORIG_CFLAGS := $(KBUILD_CFLAGS)
 KBUILD_CFLAGS = $(subst -pg,,$(ORIG_CFLAGS))
 
@@ -10,15 +10,28 @@ CFLAGS_trace_selftest_dynamic.o = -pg
 obj-y += trace_selftest_dynamic.o
 endif
 
-obj-$(CONFIG_FTRACE) += libftrace.o
+# If unlikely tracing is enabled, do not trace these files
+ifdef CONFIG_TRACING_BRANCHES
+KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
+endif
+
+obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o
+obj-$(CONFIG_RING_BUFFER) += ring_buffer.o
 
 obj-$(CONFIG_TRACING) += trace.o
 obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
 obj-$(CONFIG_SYSPROF_TRACER) += trace_sysprof.o
-obj-$(CONFIG_FTRACE) += trace_functions.o
+obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
 obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
 obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
 obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
+obj-$(CONFIG_NOP_TRACER) += trace_nop.o
+obj-$(CONFIG_STACK_TRACER) += trace_stack.o
 obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
+obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
+obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
+obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
+obj-$(CONFIG_HW_BRANCH_TRACER) += trace_hw_branches.o
+obj-$(CONFIG_POWER_TRACER) += trace_power.o
 
 libftrace-y := ftrace.o
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index f6e3af31b403..2f32969c09df 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -25,17 +25,35 @@
 #include <linux/ftrace.h>
 #include <linux/sysctl.h>
 #include <linux/ctype.h>
-#include <linux/hash.h>
 #include <linux/list.h>
 
 #include <asm/ftrace.h>
 
 #include "trace.h"
 
+#define FTRACE_WARN_ON(cond)			\
+	do {					\
+		if (WARN_ON(cond))		\
+			ftrace_kill();		\
+	} while (0)
+
+#define FTRACE_WARN_ON_ONCE(cond)		\
+	do {					\
+		if (WARN_ON_ONCE(cond))		\
+			ftrace_kill();		\
+	} while (0)
+
 /* ftrace_enabled is a method to turn ftrace on or off */
 int ftrace_enabled __read_mostly;
 static int last_ftrace_enabled;
 
+/* set when tracing only a pid */
+struct pid *ftrace_pid_trace;
+static struct pid * const ftrace_swapper_pid = &init_struct_pid;
+
+/* Quick disabling of function tracer. */
+int function_trace_stop;
+
 /*
  * ftrace_disabled is set when an anomaly is discovered.
  * ftrace_disabled is much stronger than ftrace_enabled.
@@ -44,6 +62,7 @@ static int ftrace_disabled __read_mostly;
 
 static DEFINE_SPINLOCK(ftrace_lock);
 static DEFINE_MUTEX(ftrace_sysctl_lock);
+static DEFINE_MUTEX(ftrace_start_lock);
 
 static struct ftrace_ops ftrace_list_end __read_mostly =
 {
@@ -52,6 +71,8 @@ static struct ftrace_ops ftrace_list_end __read_mostly =
 
 static struct ftrace_ops *ftrace_list __read_mostly = &ftrace_list_end;
 ftrace_func_t ftrace_trace_function __read_mostly = ftrace_stub;
+ftrace_func_t __ftrace_trace_function __read_mostly = ftrace_stub;
+ftrace_func_t ftrace_pid_function __read_mostly = ftrace_stub;
 
 static void ftrace_list_func(unsigned long ip, unsigned long parent_ip)
 {
@@ -68,6 +89,21 @@ static void ftrace_list_func(unsigned long ip, unsigned long parent_ip)
 	};
 }
 
+static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip)
+{
+	if (!test_tsk_trace_trace(current))
+		return;
+
+	ftrace_pid_function(ip, parent_ip);
+}
+
+static void set_ftrace_pid_function(ftrace_func_t func)
+{
+	/* do not set ftrace_pid_function to itself! */
+	if (func != ftrace_pid_func)
+		ftrace_pid_function = func;
+}
+
 /**
  * clear_ftrace_function - reset the ftrace function
  *
@@ -77,11 +113,27 @@ static void ftrace_list_func(unsigned long ip, unsigned long parent_ip)
 void clear_ftrace_function(void)
 {
 	ftrace_trace_function = ftrace_stub;
+	__ftrace_trace_function = ftrace_stub;
+	ftrace_pid_function = ftrace_stub;
+}
+
+#ifndef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
+/*
+ * For those archs that do not test ftrace_trace_stop in their
+ * mcount call site, we need to do it from C.
+ */
+static void ftrace_test_stop_func(unsigned long ip, unsigned long parent_ip)
+{
+	if (function_trace_stop)
+		return;
+
+	__ftrace_trace_function(ip, parent_ip);
 }
+#endif
 
 static int __register_ftrace_function(struct ftrace_ops *ops)
 {
-	/* Should never be called by interrupts */
+	/* should not be called from interrupt context */
 	spin_lock(&ftrace_lock);
 
 	ops->next = ftrace_list;
@@ -95,14 +147,28 @@ static int __register_ftrace_function(struct ftrace_ops *ops)
 	ftrace_list = ops;
 
 	if (ftrace_enabled) {
+		ftrace_func_t func;
+
+		if (ops->next == &ftrace_list_end)
+			func = ops->func;
+		else
+			func = ftrace_list_func;
+
+		if (ftrace_pid_trace) {
+			set_ftrace_pid_function(func);
+			func = ftrace_pid_func;
+		}
+
 		/*
 		 * For one func, simply call it directly.
 		 * For more than one func, call the chain.
 		 */
-		if (ops->next == &ftrace_list_end)
-			ftrace_trace_function = ops->func;
-		else
-			ftrace_trace_function = ftrace_list_func;
+#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
+		ftrace_trace_function = func;
+#else
+		__ftrace_trace_function = func;
+		ftrace_trace_function = ftrace_test_stop_func;
+#endif
 	}
 
 	spin_unlock(&ftrace_lock);
@@ -115,6 +181,7 @@ static int __unregister_ftrace_function(struct ftrace_ops *ops)
 	struct ftrace_ops **p;
 	int ret = 0;
 
+	/* should not be called from interrupt context */
 	spin_lock(&ftrace_lock);
 
 	/*
@@ -140,9 +207,19 @@ static int __unregister_ftrace_function(struct ftrace_ops *ops)
 
 	if (ftrace_enabled) {
 		/* If we only have one func left, then call that directly */
-		if (ftrace_list == &ftrace_list_end ||
-		    ftrace_list->next == &ftrace_list_end)
-			ftrace_trace_function = ftrace_list->func;
+		if (ftrace_list->next == &ftrace_list_end) {
+			ftrace_func_t func = ftrace_list->func;
+
+			if (ftrace_pid_trace) {
+				set_ftrace_pid_function(func);
+				func = ftrace_pid_func;
+			}
+#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
+			ftrace_trace_function = func;
+#else
+			__ftrace_trace_function = func;
+#endif
+		}
 	}
 
  out:
@@ -151,9 +228,48 @@ static int __unregister_ftrace_function(struct ftrace_ops *ops)
 	return ret;
 }
 
+static void ftrace_update_pid_func(void)
+{
+	ftrace_func_t func;
+
+	/* should not be called from interrupt context */
+	spin_lock(&ftrace_lock);
+
+	if (ftrace_trace_function == ftrace_stub)
+		goto out;
+
+	func = ftrace_trace_function;
+
+	if (ftrace_pid_trace) {
+		set_ftrace_pid_function(func);
+		func = ftrace_pid_func;
+	} else {
+		if (func == ftrace_pid_func)
+			func = ftrace_pid_function;
+	}
+
+#ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
+	ftrace_trace_function = func;
+#else
+	__ftrace_trace_function = func;
+#endif
+
+ out:
+	spin_unlock(&ftrace_lock);
+}
+
 #ifdef CONFIG_DYNAMIC_FTRACE
+#ifndef CONFIG_FTRACE_MCOUNT_RECORD
+# error Dynamic ftrace depends on MCOUNT_RECORD
+#endif
 
-static struct task_struct *ftraced_task;
+/*
+ * Since MCOUNT_ADDR may point to mcount itself, we do not want
+ * to get it confused by reading a reference in the code as we
+ * are parsing on objcopy output of text. Use a variable for
+ * it instead.
+ */
+static unsigned long mcount_addr = MCOUNT_ADDR;
 
 enum {
 	FTRACE_ENABLE_CALLS		= (1 << 0),
@@ -161,18 +277,14 @@ enum {
 	FTRACE_UPDATE_TRACE_FUNC	= (1 << 2),
 	FTRACE_ENABLE_MCOUNT		= (1 << 3),
 	FTRACE_DISABLE_MCOUNT		= (1 << 4),
+	FTRACE_START_FUNC_RET		= (1 << 5),
+	FTRACE_STOP_FUNC_RET		= (1 << 6),
 };
 
 static int ftrace_filtered;
-static int tracing_on;
-static int frozen_record_count;
-
-static struct hlist_head ftrace_hash[FTRACE_HASHSIZE];
 
-static DEFINE_PER_CPU(int, ftrace_shutdown_disable_cpu);
+static LIST_HEAD(ftrace_new_addrs);
 
-static DEFINE_SPINLOCK(ftrace_shutdown_lock);
-static DEFINE_MUTEX(ftraced_lock);
 static DEFINE_MUTEX(ftrace_regex_lock);
 
 struct ftrace_page {
@@ -190,16 +302,13 @@ struct ftrace_page {
 static struct ftrace_page	*ftrace_pages_start;
 static struct ftrace_page	*ftrace_pages;
 
-static int ftraced_trigger;
-static int ftraced_suspend;
-static int ftraced_stop;
-
-static int ftrace_record_suspend;
-
 static struct dyn_ftrace *ftrace_free_records;
 
 
 #ifdef CONFIG_KPROBES
+
+static int frozen_record_count;
+
 static inline void freeze_record(struct dyn_ftrace *rec)
 {
 	if (!(rec->flags & FTRACE_FL_FROZEN)) {
@@ -226,79 +335,36 @@ static inline int record_frozen(struct dyn_ftrace *rec)
 # define record_frozen(rec)			({ 0; })
 #endif /* CONFIG_KPROBES */
 
-int skip_trace(unsigned long ip)
+static void ftrace_free_rec(struct dyn_ftrace *rec)
 {
-	unsigned long fl;
-	struct dyn_ftrace *rec;
-	struct hlist_node *t;
-	struct hlist_head *head;
-
-	if (frozen_record_count == 0)
-		return 0;
-
-	head = &ftrace_hash[hash_long(ip, FTRACE_HASHBITS)];
-	hlist_for_each_entry_rcu(rec, t, head, node) {
-		if (rec->ip == ip) {
-			if (record_frozen(rec)) {
-				if (rec->flags & FTRACE_FL_FAILED)
-					return 1;
-
-				if (!(rec->flags & FTRACE_FL_CONVERTED))
-					return 1;
-
-				if (!tracing_on || !ftrace_enabled)
-					return 1;
-
-				if (ftrace_filtered) {
-					fl = rec->flags & (FTRACE_FL_FILTER |
-							   FTRACE_FL_NOTRACE);
-					if (!fl || (fl & FTRACE_FL_NOTRACE))
-						return 1;
-				}
-			}
-			break;
-		}
-	}
-
-	return 0;
+	rec->ip = (unsigned long)ftrace_free_records;
+	ftrace_free_records = rec;
+	rec->flags |= FTRACE_FL_FREE;
 }
 
-static inline int
-ftrace_ip_in_hash(unsigned long ip, unsigned long key)
+void ftrace_release(void *start, unsigned long size)
 {
-	struct dyn_ftrace *p;
-	struct hlist_node *t;
-	int found = 0;
-
-	hlist_for_each_entry_rcu(p, t, &ftrace_hash[key], node) {
-		if (p->ip == ip) {
-			found = 1;
-			break;
-		}
-	}
-
-	return found;
-}
+	struct dyn_ftrace *rec;
+	struct ftrace_page *pg;
+	unsigned long s = (unsigned long)start;
+	unsigned long e = s + size;
+	int i;
 
-static inline void
-ftrace_add_hash(struct dyn_ftrace *node, unsigned long key)
-{
-	hlist_add_head_rcu(&node->node, &ftrace_hash[key]);
-}
+	if (ftrace_disabled || !start)
+		return;
 
-/* called from kstop_machine */
-static inline void ftrace_del_hash(struct dyn_ftrace *node)
-{
-	hlist_del(&node->node);
-}
+	/* should not be called from interrupt context */
+	spin_lock(&ftrace_lock);
 
-static void ftrace_free_rec(struct dyn_ftrace *rec)
-{
-	/* no locking, only called from kstop_machine */
+	for (pg = ftrace_pages_start; pg; pg = pg->next) {
+		for (i = 0; i < pg->index; i++) {
+			rec = &pg->records[i];
 
-	rec->ip = (unsigned long)ftrace_free_records;
-	ftrace_free_records = rec;
-	rec->flags |= FTRACE_FL_FREE;
+			if ((rec->ip >= s) && (rec->ip < e))
+				ftrace_free_rec(rec);
+		}
+	}
+	spin_unlock(&ftrace_lock);
 }
 
 static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip)
@@ -310,10 +376,8 @@ static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip)
 		rec = ftrace_free_records;
 
 		if (unlikely(!(rec->flags & FTRACE_FL_FREE))) {
-			WARN_ON_ONCE(1);
+			FTRACE_WARN_ON_ONCE(1);
 			ftrace_free_records = NULL;
-			ftrace_disabled = 1;
-			ftrace_enabled = 0;
 			return NULL;
 		}
 
@@ -323,182 +387,163 @@ static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip)
 	}
 
 	if (ftrace_pages->index == ENTRIES_PER_PAGE) {
-		if (!ftrace_pages->next)
-			return NULL;
+		if (!ftrace_pages->next) {
+			/* allocate another page */
+			ftrace_pages->next =
+				(void *)get_zeroed_page(GFP_KERNEL);
+			if (!ftrace_pages->next)
+				return NULL;
+		}
 		ftrace_pages = ftrace_pages->next;
 	}
 
 	return &ftrace_pages->records[ftrace_pages->index++];
 }
 
-static void
+static struct dyn_ftrace *
 ftrace_record_ip(unsigned long ip)
 {
-	struct dyn_ftrace *node;
-	unsigned long flags;
-	unsigned long key;
-	int resched;
-	int atomic;
-	int cpu;
-
-	if (!ftrace_enabled || ftrace_disabled)
-		return;
-
-	resched = need_resched();
-	preempt_disable_notrace();
-
-	/*
-	 * We simply need to protect against recursion.
-	 * Use the the raw version of smp_processor_id and not
-	 * __get_cpu_var which can call debug hooks that can
-	 * cause a recursive crash here.
-	 */
-	cpu = raw_smp_processor_id();
-	per_cpu(ftrace_shutdown_disable_cpu, cpu)++;
-	if (per_cpu(ftrace_shutdown_disable_cpu, cpu) != 1)
-		goto out;
-
-	if (unlikely(ftrace_record_suspend))
-		goto out;
-
-	key = hash_long(ip, FTRACE_HASHBITS);
-
-	WARN_ON_ONCE(key >= FTRACE_HASHSIZE);
-
-	if (ftrace_ip_in_hash(ip, key))
-		goto out;
-
-	atomic = irqs_disabled();
-
-	spin_lock_irqsave(&ftrace_shutdown_lock, flags);
+	struct dyn_ftrace *rec;
 
-	/* This ip may have hit the hash before the lock */
-	if (ftrace_ip_in_hash(ip, key))
-		goto out_unlock;
+	if (ftrace_disabled)
+		return NULL;
 
-	node = ftrace_alloc_dyn_node(ip);
-	if (!node)
-		goto out_unlock;
+	rec = ftrace_alloc_dyn_node(ip);
+	if (!rec)
+		return NULL;
 
-	node->ip = ip;
+	rec->ip = ip;
 
-	ftrace_add_hash(node, key);
+	list_add(&rec->list, &ftrace_new_addrs);
 
-	ftraced_trigger = 1;
+	return rec;
+}
 
- out_unlock:
-	spin_unlock_irqrestore(&ftrace_shutdown_lock, flags);
- out:
-	per_cpu(ftrace_shutdown_disable_cpu, cpu)--;
+static void print_ip_ins(const char *fmt, unsigned char *p)
+{
+	int i;
 
-	/* prevent recursion with scheduler */
-	if (resched)
-		preempt_enable_no_resched_notrace();
-	else
-		preempt_enable_notrace();
+	printk(KERN_CONT "%s", fmt);
+
+	for (i = 0; i < MCOUNT_INSN_SIZE; i++)
+		printk(KERN_CONT "%s%02x", i ? ":" : "", p[i]);
+}
+
+static void ftrace_bug(int failed, unsigned long ip)
+{
+	switch (failed) {
+	case -EFAULT:
+		FTRACE_WARN_ON_ONCE(1);
+		pr_info("ftrace faulted on modifying ");
+		print_ip_sym(ip);
+		break;
+	case -EINVAL:
+		FTRACE_WARN_ON_ONCE(1);
+		pr_info("ftrace failed to modify ");
+		print_ip_sym(ip);
+		print_ip_ins(" actual: ", (unsigned char *)ip);
+		printk(KERN_CONT "\n");
+		break;
+	case -EPERM:
+		FTRACE_WARN_ON_ONCE(1);
+		pr_info("ftrace faulted on writing ");
+		print_ip_sym(ip);
+		break;
+	default:
+		FTRACE_WARN_ON_ONCE(1);
+		pr_info("ftrace faulted on unknown error ");
+		print_ip_sym(ip);
+	}
 }
 
-#define FTRACE_ADDR ((long)(ftrace_caller))
 
 static int
-__ftrace_replace_code(struct dyn_ftrace *rec,
-		      unsigned char *old, unsigned char *new, int enable)
+__ftrace_replace_code(struct dyn_ftrace *rec, int enable)
 {
 	unsigned long ip, fl;
+	unsigned long ftrace_addr;
+
+	ftrace_addr = (unsigned long)ftrace_caller;
 
 	ip = rec->ip;
 
-	if (ftrace_filtered && enable) {
+	/*
+	 * If this record is not to be traced and
+	 * it is not enabled then do nothing.
+	 *
+	 * If this record is not to be traced and
+	 * it is enabled then disabled it.
+	 *
+	 */
+	if (rec->flags & FTRACE_FL_NOTRACE) {
+		if (rec->flags & FTRACE_FL_ENABLED)
+			rec->flags &= ~FTRACE_FL_ENABLED;
+		else
+			return 0;
+
+	} else if (ftrace_filtered && enable) {
 		/*
-		 * If filtering is on:
-		 *
-		 * If this record is set to be filtered and
-		 * is enabled then do nothing.
-		 *
-		 * If this record is set to be filtered and
-		 * it is not enabled, enable it.
-		 *
-		 * If this record is not set to be filtered
-		 * and it is not enabled do nothing.
-		 *
-		 * If this record is set not to trace then
-		 * do nothing.
-		 *
-		 * If this record is set not to trace and
-		 * it is enabled then disable it.
-		 *
-		 * If this record is not set to be filtered and
-		 * it is enabled, disable it.
+		 * Filtering is on:
 		 */
 
-		fl = rec->flags & (FTRACE_FL_FILTER | FTRACE_FL_NOTRACE |
-				   FTRACE_FL_ENABLED);
+		fl = rec->flags & (FTRACE_FL_FILTER | FTRACE_FL_ENABLED);
 
-		if ((fl ==  (FTRACE_FL_FILTER | FTRACE_FL_ENABLED)) ||
-		    (fl ==  (FTRACE_FL_FILTER | FTRACE_FL_NOTRACE)) ||
-		    !fl || (fl == FTRACE_FL_NOTRACE))
+		/* Record is filtered and enabled, do nothing */
+		if (fl == (FTRACE_FL_FILTER | FTRACE_FL_ENABLED))
 			return 0;
 
-		/*
-		 * If it is enabled disable it,
-		 * otherwise enable it!
-		 */
-		if (fl & FTRACE_FL_ENABLED) {
-			/* swap new and old */
-			new = old;
-			old = ftrace_call_replace(ip, FTRACE_ADDR);
+		/* Record is not filtered and is not enabled do nothing */
+		if (!fl)
+			return 0;
+
+		/* Record is not filtered but enabled, disable it */
+		if (fl == FTRACE_FL_ENABLED)
 			rec->flags &= ~FTRACE_FL_ENABLED;
-		} else {
-			new = ftrace_call_replace(ip, FTRACE_ADDR);
+		else
+		/* Otherwise record is filtered but not enabled, enable it */
 			rec->flags |= FTRACE_FL_ENABLED;
-		}
 	} else {
+		/* Disable or not filtered */
 
 		if (enable) {
-			/*
-			 * If this record is set not to trace and is
-			 * not enabled, do nothing.
-			 */
-			fl = rec->flags & (FTRACE_FL_NOTRACE | FTRACE_FL_ENABLED);
-			if (fl == FTRACE_FL_NOTRACE)
-				return 0;
-
-			new = ftrace_call_replace(ip, FTRACE_ADDR);
-		} else
-			old = ftrace_call_replace(ip, FTRACE_ADDR);
-
-		if (enable) {
+			/* if record is enabled, do nothing */
 			if (rec->flags & FTRACE_FL_ENABLED)
 				return 0;
+
 			rec->flags |= FTRACE_FL_ENABLED;
+
 		} else {
+
+			/* if record is not enabled do nothing */
 			if (!(rec->flags & FTRACE_FL_ENABLED))
 				return 0;
+
 			rec->flags &= ~FTRACE_FL_ENABLED;
 		}
 	}
 
-	return ftrace_modify_code(ip, old, new);
+	if (rec->flags & FTRACE_FL_ENABLED)
+		return ftrace_make_call(rec, ftrace_addr);
+	else
+		return ftrace_make_nop(NULL, rec, ftrace_addr);
 }
 
 static void ftrace_replace_code(int enable)
 {
 	int i, failed;
-	unsigned char *new = NULL, *old = NULL;
 	struct dyn_ftrace *rec;
 	struct ftrace_page *pg;
 
-	if (enable)
-		old = ftrace_nop_replace();
-	else
-		new = ftrace_nop_replace();
-
 	for (pg = ftrace_pages_start; pg; pg = pg->next) {
 		for (i = 0; i < pg->index; i++) {
 			rec = &pg->records[i];
 
-			/* don't modify code that has already faulted */
-			if (rec->flags & FTRACE_FL_FAILED)
+			/*
+			 * Skip over free records and records that have
+			 * failed.
+			 */
+			if (rec->flags & FTRACE_FL_FREE ||
+			    rec->flags & FTRACE_FL_FAILED)
 				continue;
 
 			/* ignore updates to this record's mcount site */
@@ -509,78 +554,52 @@ static void ftrace_replace_code(int enable)
 				unfreeze_record(rec);
 			}
 
-			failed = __ftrace_replace_code(rec, old, new, enable);
+			failed = __ftrace_replace_code(rec, enable);
 			if (failed && (rec->flags & FTRACE_FL_CONVERTED)) {
 				rec->flags |= FTRACE_FL_FAILED;
 				if ((system_state == SYSTEM_BOOTING) ||
 				    !core_kernel_text(rec->ip)) {
-					ftrace_del_hash(rec);
 					ftrace_free_rec(rec);
-				}
+				} else
+					ftrace_bug(failed, rec->ip);
 			}
 		}
 	}
 }
 
-static void ftrace_shutdown_replenish(void)
-{
-	if (ftrace_pages->next)
-		return;
-
-	/* allocate another page */
-	ftrace_pages->next = (void *)get_zeroed_page(GFP_KERNEL);
-}
-
 static int
-ftrace_code_disable(struct dyn_ftrace *rec)
+ftrace_code_disable(struct module *mod, struct dyn_ftrace *rec)
 {
 	unsigned long ip;
-	unsigned char *nop, *call;
-	int failed;
+	int ret;
 
 	ip = rec->ip;
 
-	nop = ftrace_nop_replace();
-	call = ftrace_call_replace(ip, MCOUNT_ADDR);
-
-	failed = ftrace_modify_code(ip, call, nop);
-	if (failed) {
+	ret = ftrace_make_nop(mod, rec, mcount_addr);
+	if (ret) {
+		ftrace_bug(ret, ip);
 		rec->flags |= FTRACE_FL_FAILED;
 		return 0;
 	}
 	return 1;
 }
 
-static int __ftrace_update_code(void *ignore);
-
 static int __ftrace_modify_code(void *data)
 {
-	unsigned long addr;
 	int *command = data;
 
-	if (*command & FTRACE_ENABLE_CALLS) {
-		/*
-		 * Update any recorded ips now that we have the
-		 * machine stopped
-		 */
-		__ftrace_update_code(NULL);
+	if (*command & FTRACE_ENABLE_CALLS)
 		ftrace_replace_code(1);
-		tracing_on = 1;
-	} else if (*command & FTRACE_DISABLE_CALLS) {
+	else if (*command & FTRACE_DISABLE_CALLS)
 		ftrace_replace_code(0);
-		tracing_on = 0;
-	}
 
 	if (*command & FTRACE_UPDATE_TRACE_FUNC)
 		ftrace_update_ftrace_func(ftrace_trace_function);
 
-	if (*command & FTRACE_ENABLE_MCOUNT) {
-		addr = (unsigned long)ftrace_record_ip;
-		ftrace_mcount_set(&addr);
-	} else if (*command & FTRACE_DISABLE_MCOUNT) {
-		addr = (unsigned long)ftrace_stub;
-		ftrace_mcount_set(&addr);
-	}
+	if (*command & FTRACE_START_FUNC_RET)
+		ftrace_enable_ftrace_graph_caller();
+	else if (*command & FTRACE_STOP_FUNC_RET)
+		ftrace_disable_ftrace_graph_caller();
 
 	return 0;
 }
@@ -590,62 +609,44 @@ static void ftrace_run_update_code(int command)
 	stop_machine(__ftrace_modify_code, &command, NULL);
 }
 
-void ftrace_disable_daemon(void)
-{
-	/* Stop the daemon from calling kstop_machine */
-	mutex_lock(&ftraced_lock);
-	ftraced_stop = 1;
-	mutex_unlock(&ftraced_lock);
-
-	ftrace_force_update();
-}
-
-void ftrace_enable_daemon(void)
-{
-	mutex_lock(&ftraced_lock);
-	ftraced_stop = 0;
-	mutex_unlock(&ftraced_lock);
-
-	ftrace_force_update();
-}
-
 static ftrace_func_t saved_ftrace_func;
+static int ftrace_start_up;
 
-static void ftrace_startup(void)
+static void ftrace_startup_enable(int command)
 {
-	int command = 0;
-
-	if (unlikely(ftrace_disabled))
-		return;
-
-	mutex_lock(&ftraced_lock);
-	ftraced_suspend++;
-	if (ftraced_suspend == 1)
-		command |= FTRACE_ENABLE_CALLS;
-
 	if (saved_ftrace_func != ftrace_trace_function) {
 		saved_ftrace_func = ftrace_trace_function;
 		command |= FTRACE_UPDATE_TRACE_FUNC;
 	}
 
 	if (!command || !ftrace_enabled)
-		goto out;
+		return;
 
 	ftrace_run_update_code(command);
- out:
-	mutex_unlock(&ftraced_lock);
 }
 
-static void ftrace_shutdown(void)
+static void ftrace_startup(int command)
 {
-	int command = 0;
+	if (unlikely(ftrace_disabled))
+		return;
+
+	mutex_lock(&ftrace_start_lock);
+	ftrace_start_up++;
+	command |= FTRACE_ENABLE_CALLS;
 
+	ftrace_startup_enable(command);
+
+	mutex_unlock(&ftrace_start_lock);
+}
+
+static void ftrace_shutdown(int command)
+{
 	if (unlikely(ftrace_disabled))
 		return;
 
-	mutex_lock(&ftraced_lock);
-	ftraced_suspend--;
-	if (!ftraced_suspend)
+	mutex_lock(&ftrace_start_lock);
+	ftrace_start_up--;
+	if (!ftrace_start_up)
 		command |= FTRACE_DISABLE_CALLS;
 
 	if (saved_ftrace_func != ftrace_trace_function) {
@@ -658,7 +659,7 @@ static void ftrace_shutdown(void)
 
 	ftrace_run_update_code(command);
  out:
-	mutex_unlock(&ftraced_lock);
+	mutex_unlock(&ftrace_start_lock);
 }
 
 static void ftrace_startup_sysctl(void)
@@ -668,15 +669,15 @@ static void ftrace_startup_sysctl(void)
 	if (unlikely(ftrace_disabled))
 		return;
 
-	mutex_lock(&ftraced_lock);
+	mutex_lock(&ftrace_start_lock);
 	/* Force update next time */
 	saved_ftrace_func = NULL;
-	/* ftraced_suspend is true if we want ftrace running */
-	if (ftraced_suspend)
+	/* ftrace_start_up is true if we want ftrace running */
+	if (ftrace_start_up)
 		command |= FTRACE_ENABLE_CALLS;
 
 	ftrace_run_update_code(command);
-	mutex_unlock(&ftraced_lock);
+	mutex_unlock(&ftrace_start_lock);
 }
 
 static void ftrace_shutdown_sysctl(void)
@@ -686,153 +687,51 @@ static void ftrace_shutdown_sysctl(void)
 	if (unlikely(ftrace_disabled))
 		return;
 
-	mutex_lock(&ftraced_lock);
-	/* ftraced_suspend is true if ftrace is running */
-	if (ftraced_suspend)
+	mutex_lock(&ftrace_start_lock);
+	/* ftrace_start_up is true if ftrace is running */
+	if (ftrace_start_up)
 		command |= FTRACE_DISABLE_CALLS;
 
 	ftrace_run_update_code(command);
-	mutex_unlock(&ftraced_lock);
+	mutex_unlock(&ftrace_start_lock);
 }
 
 static cycle_t		ftrace_update_time;
 static unsigned long	ftrace_update_cnt;
 unsigned long		ftrace_update_tot_cnt;
 
-static int __ftrace_update_code(void *ignore)
+static int ftrace_update_code(struct module *mod)
 {
-	int i, save_ftrace_enabled;
+	struct dyn_ftrace *p, *t;
 	cycle_t start, stop;
-	struct dyn_ftrace *p;
-	struct hlist_node *t, *n;
-	struct hlist_head *head, temp_list;
-
-	/* Don't be recording funcs now */
-	ftrace_record_suspend++;
-	save_ftrace_enabled = ftrace_enabled;
-	ftrace_enabled = 0;
 
 	start = ftrace_now(raw_smp_processor_id());
 	ftrace_update_cnt = 0;
 
-	/* No locks needed, the machine is stopped! */
-	for (i = 0; i < FTRACE_HASHSIZE; i++) {
-		INIT_HLIST_HEAD(&temp_list);
-		head = &ftrace_hash[i];
+	list_for_each_entry_safe(p, t, &ftrace_new_addrs, list) {
 
-		/* all CPUS are stopped, we are safe to modify code */
-		hlist_for_each_entry_safe(p, t, n, head, node) {
-			/* Skip over failed records which have not been
-			 * freed. */
-			if (p->flags & FTRACE_FL_FAILED)
-				continue;
-
-			/* Unconverted records are always at the head of the
-			 * hash bucket. Once we encounter a converted record,
-			 * simply skip over to the next bucket. Saves ftraced
-			 * some processor cycles (ftrace does its bid for
-			 * global warming :-p ). */
-			if (p->flags & (FTRACE_FL_CONVERTED))
-				break;
-
-			/* Ignore updates to this record's mcount site.
-			 * Reintroduce this record at the head of this
-			 * bucket to attempt to "convert" it again if
-			 * the kprobe on it is unregistered before the
-			 * next run. */
-			if (get_kprobe((void *)p->ip)) {
-				ftrace_del_hash(p);
-				INIT_HLIST_NODE(&p->node);
-				hlist_add_head(&p->node, &temp_list);
-				freeze_record(p);
-				continue;
-			} else {
-				unfreeze_record(p);
-			}
+		/* If something went wrong, bail without enabling anything */
+		if (unlikely(ftrace_disabled))
+			return -1;
 
-			/* convert record (i.e, patch mcount-call with NOP) */
-			if (ftrace_code_disable(p)) {
-				p->flags |= FTRACE_FL_CONVERTED;
-				ftrace_update_cnt++;
-			} else {
-				if ((system_state == SYSTEM_BOOTING) ||
-				    !core_kernel_text(p->ip)) {
-					ftrace_del_hash(p);
-					ftrace_free_rec(p);
-				}
-			}
-		}
+		list_del_init(&p->list);
 
-		hlist_for_each_entry_safe(p, t, n, &temp_list, node) {
-			hlist_del(&p->node);
-			INIT_HLIST_NODE(&p->node);
-			hlist_add_head(&p->node, head);
-		}
+		/* convert record (i.e, patch mcount-call with NOP) */
+		if (ftrace_code_disable(mod, p)) {
+			p->flags |= FTRACE_FL_CONVERTED;
+			ftrace_update_cnt++;
+		} else
+			ftrace_free_rec(p);
 	}
 
 	stop = ftrace_now(raw_smp_processor_id());
 	ftrace_update_time = stop - start;
 	ftrace_update_tot_cnt += ftrace_update_cnt;
-	ftraced_trigger = 0;
-
-	ftrace_enabled = save_ftrace_enabled;
-	ftrace_record_suspend--;
 
 	return 0;
 }
 
-static int ftrace_update_code(void)
-{
-	if (unlikely(ftrace_disabled) ||
-	    !ftrace_enabled || !ftraced_trigger)
-		return 0;
-
-	stop_machine(__ftrace_update_code, NULL, NULL);
-
-	return 1;
-}
-
-static int ftraced(void *ignore)
-{
-	unsigned long usecs;
-
-	while (!kthread_should_stop()) {
-
-		set_current_state(TASK_INTERRUPTIBLE);
-
-		/* check once a second */
-		schedule_timeout(HZ);
-
-		if (unlikely(ftrace_disabled))
-			continue;
-
-		mutex_lock(&ftrace_sysctl_lock);
-		mutex_lock(&ftraced_lock);
-		if (!ftraced_suspend && !ftraced_stop &&
-		    ftrace_update_code()) {
-			usecs = nsecs_to_usecs(ftrace_update_time);
-			if (ftrace_update_tot_cnt > 100000) {
-				ftrace_update_tot_cnt = 0;
-				pr_info("hm, dftrace overflow: %lu change%s"
-					" (%lu total) in %lu usec%s\n",
-					ftrace_update_cnt,
-					ftrace_update_cnt != 1 ? "s" : "",
-					ftrace_update_tot_cnt,
-					usecs, usecs != 1 ? "s" : "");
-				ftrace_disabled = 1;
-				WARN_ON_ONCE(1);
-			}
-		}
-		mutex_unlock(&ftraced_lock);
-		mutex_unlock(&ftrace_sysctl_lock);
-
-		ftrace_shutdown_replenish();
-	}
-	__set_current_state(TASK_RUNNING);
-	return 0;
-}
-
-static int __init ftrace_dyn_table_alloc(void)
+static int __init ftrace_dyn_table_alloc(unsigned long num_to_init)
 {
 	struct ftrace_page *pg;
 	int cnt;
@@ -859,7 +758,9 @@ static int __init ftrace_dyn_table_alloc(void)
 
 	pg = ftrace_pages = ftrace_pages_start;
 
-	cnt = NR_TO_INIT / ENTRIES_PER_PAGE;
+	cnt = num_to_init / ENTRIES_PER_PAGE;
+	pr_info("ftrace: allocating %ld entries in %d pages\n",
+		num_to_init, cnt + 1);
 
 	for (i = 0; i < cnt; i++) {
 		pg->next = (void *)get_zeroed_page(GFP_KERNEL);
@@ -884,7 +785,6 @@ enum {
 #define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */
 
 struct ftrace_iterator {
-	loff_t			pos;
 	struct ftrace_page	*pg;
 	unsigned		idx;
 	unsigned		flags;
@@ -901,21 +801,26 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
 
 	(*pos)++;
 
+	/* should not be called from interrupt context */
+	spin_lock(&ftrace_lock);
  retry:
 	if (iter->idx >= iter->pg->index) {
 		if (iter->pg->next) {
 			iter->pg = iter->pg->next;
 			iter->idx = 0;
 			goto retry;
+		} else {
+			iter->idx = -1;
 		}
 	} else {
 		rec = &iter->pg->records[iter->idx++];
-		if ((!(iter->flags & FTRACE_ITER_FAILURES) &&
+		if ((rec->flags & FTRACE_FL_FREE) ||
+
+		    (!(iter->flags & FTRACE_ITER_FAILURES) &&
 		     (rec->flags & FTRACE_FL_FAILED)) ||
 
 		    ((iter->flags & FTRACE_ITER_FAILURES) &&
-		     (!(rec->flags & FTRACE_FL_FAILED) ||
-		      (rec->flags & FTRACE_FL_FREE))) ||
+		     !(rec->flags & FTRACE_FL_FAILED)) ||
 
 		    ((iter->flags & FTRACE_ITER_FILTER) &&
 		     !(rec->flags & FTRACE_FL_FILTER)) ||
@@ -926,8 +831,7 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
 			goto retry;
 		}
 	}
-
-	iter->pos = *pos;
+	spin_unlock(&ftrace_lock);
 
 	return rec;
 }
@@ -936,16 +840,16 @@ static void *t_start(struct seq_file *m, loff_t *pos)
 {
 	struct ftrace_iterator *iter = m->private;
 	void *p = NULL;
-	loff_t l = -1;
 
-	if (*pos != iter->pos) {
-		for (p = t_next(m, p, &l); p && l < *pos; p = t_next(m, p, &l))
-			;
-	} else {
-		l = *pos;
-		p = t_next(m, p, &l);
+	if (*pos > 0) {
+		if (iter->idx < 0)
+			return p;
+		(*pos)--;
+		iter->idx--;
 	}
 
+	p = t_next(m, p, pos);
+
 	return p;
 }
 
@@ -989,7 +893,6 @@ ftrace_avail_open(struct inode *inode, struct file *file)
 		return -ENOMEM;
 
 	iter->pg = ftrace_pages_start;
-	iter->pos = -1;
 
 	ret = seq_open(file, &show_ftrace_seq_ops);
 	if (!ret) {
@@ -1039,8 +942,8 @@ static void ftrace_filter_reset(int enable)
 	unsigned long type = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
 	unsigned i;
 
-	/* keep kstop machine from running */
-	preempt_disable();
+	/* should not be called from interrupt context */
+	spin_lock(&ftrace_lock);
 	if (enable)
 		ftrace_filtered = 0;
 	pg = ftrace_pages_start;
@@ -1053,7 +956,7 @@ static void ftrace_filter_reset(int enable)
 		}
 		pg = pg->next;
 	}
-	preempt_enable();
+	spin_unlock(&ftrace_lock);
 }
 
 static int
@@ -1076,7 +979,6 @@ ftrace_regex_open(struct inode *inode, struct file *file, int enable)
 
 	if (file->f_mode & FMODE_READ) {
 		iter->pg = ftrace_pages_start;
-		iter->pos = -1;
 		iter->flags = enable ? FTRACE_ITER_FILTER :
 			FTRACE_ITER_NOTRACE;
 
@@ -1145,6 +1047,13 @@ ftrace_match(unsigned char *buff, int len, int enable)
 	int type = MATCH_FULL;
 	unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
 	unsigned i, match = 0, search_len = 0;
+	int not = 0;
+
+	if (buff[0] == '!') {
+		not = 1;
+		buff++;
+		len--;
+	}
 
 	for (i = 0; i < len; i++) {
 		if (buff[i] == '*') {
@@ -1165,8 +1074,8 @@ ftrace_match(unsigned char *buff, int len, int enable)
 		}
 	}
 
-	/* keep kstop machine from running */
-	preempt_disable();
+	/* should not be called from interrupt context */
+	spin_lock(&ftrace_lock);
 	if (enable)
 		ftrace_filtered = 1;
 	pg = ftrace_pages_start;
@@ -1198,12 +1107,16 @@ ftrace_match(unsigned char *buff, int len, int enable)
 					matched = 1;
 				break;
 			}
-			if (matched)
-				rec->flags |= flag;
+			if (matched) {
+				if (not)
+					rec->flags &= ~flag;
+				else
+					rec->flags |= flag;
+			}
 		}
 		pg = pg->next;
 	}
-	preempt_enable();
+	spin_unlock(&ftrace_lock);
 }
 
 static ssize_t
@@ -1366,10 +1279,10 @@ ftrace_regex_release(struct inode *inode, struct file *file, int enable)
 	}
 
 	mutex_lock(&ftrace_sysctl_lock);
-	mutex_lock(&ftraced_lock);
-	if (iter->filtered && ftraced_suspend && ftrace_enabled)
+	mutex_lock(&ftrace_start_lock);
+	if (ftrace_start_up && ftrace_enabled)
 		ftrace_run_update_code(FTRACE_ENABLE_CALLS);
-	mutex_unlock(&ftraced_lock);
+	mutex_unlock(&ftrace_start_lock);
 	mutex_unlock(&ftrace_sysctl_lock);
 
 	kfree(iter);
@@ -1389,55 +1302,6 @@ ftrace_notrace_release(struct inode *inode, struct file *file)
 	return ftrace_regex_release(inode, file, 0);
 }
 
-static ssize_t
-ftraced_read(struct file *filp, char __user *ubuf,
-		     size_t cnt, loff_t *ppos)
-{
-	/* don't worry about races */
-	char *buf = ftraced_stop ? "disabled\n" : "enabled\n";
-	int r = strlen(buf);
-
-	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
-}
-
-static ssize_t
-ftraced_write(struct file *filp, const char __user *ubuf,
-		      size_t cnt, loff_t *ppos)
-{
-	char buf[64];
-	long val;
-	int ret;
-
-	if (cnt >= sizeof(buf))
-		return -EINVAL;
-
-	if (copy_from_user(&buf, ubuf, cnt))
-		return -EFAULT;
-
-	if (strncmp(buf, "enable", 6) == 0)
-		val = 1;
-	else if (strncmp(buf, "disable", 7) == 0)
-		val = 0;
-	else {
-		buf[cnt] = 0;
-
-		ret = strict_strtoul(buf, 10, &val);
-		if (ret < 0)
-			return ret;
-
-		val = !!val;
-	}
-
-	if (val)
-		ftrace_enable_daemon();
-	else
-		ftrace_disable_daemon();
-
-	filp->f_pos += cnt;
-
-	return cnt;
-}
-
 static struct file_operations ftrace_avail_fops = {
 	.open = ftrace_avail_open,
 	.read = seq_read,
@@ -1468,60 +1332,233 @@ static struct file_operations ftrace_notrace_fops = {
 	.release = ftrace_notrace_release,
 };
 
-static struct file_operations ftraced_fops = {
-	.open = tracing_open_generic,
-	.read = ftraced_read,
-	.write = ftraced_write,
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+
+static DEFINE_MUTEX(graph_lock);
+
+int ftrace_graph_count;
+unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS] __read_mostly;
+
+static void *
+g_next(struct seq_file *m, void *v, loff_t *pos)
+{
+	unsigned long *array = m->private;
+	int index = *pos;
+
+	(*pos)++;
+
+	if (index >= ftrace_graph_count)
+		return NULL;
+
+	return &array[index];
+}
+
+static void *g_start(struct seq_file *m, loff_t *pos)
+{
+	void *p = NULL;
+
+	mutex_lock(&graph_lock);
+
+	p = g_next(m, p, pos);
+
+	return p;
+}
+
+static void g_stop(struct seq_file *m, void *p)
+{
+	mutex_unlock(&graph_lock);
+}
+
+static int g_show(struct seq_file *m, void *v)
+{
+	unsigned long *ptr = v;
+	char str[KSYM_SYMBOL_LEN];
+
+	if (!ptr)
+		return 0;
+
+	kallsyms_lookup(*ptr, NULL, NULL, NULL, str);
+
+	seq_printf(m, "%s\n", str);
+
+	return 0;
+}
+
+static struct seq_operations ftrace_graph_seq_ops = {
+	.start = g_start,
+	.next = g_next,
+	.stop = g_stop,
+	.show = g_show,
 };
 
-/**
- * ftrace_force_update - force an update to all recording ftrace functions
- */
-int ftrace_force_update(void)
+static int
+ftrace_graph_open(struct inode *inode, struct file *file)
 {
 	int ret = 0;
 
 	if (unlikely(ftrace_disabled))
 		return -ENODEV;
 
-	mutex_lock(&ftrace_sysctl_lock);
-	mutex_lock(&ftraced_lock);
-
-	/*
-	 * If ftraced_trigger is not set, then there is nothing
-	 * to update.
-	 */
-	if (ftraced_trigger && !ftrace_update_code())
-		ret = -EBUSY;
+	mutex_lock(&graph_lock);
+	if ((file->f_mode & FMODE_WRITE) &&
+	    !(file->f_flags & O_APPEND)) {
+		ftrace_graph_count = 0;
+		memset(ftrace_graph_funcs, 0, sizeof(ftrace_graph_funcs));
+	}
 
-	mutex_unlock(&ftraced_lock);
-	mutex_unlock(&ftrace_sysctl_lock);
+	if (file->f_mode & FMODE_READ) {
+		ret = seq_open(file, &ftrace_graph_seq_ops);
+		if (!ret) {
+			struct seq_file *m = file->private_data;
+			m->private = ftrace_graph_funcs;
+		}
+	} else
+		file->private_data = ftrace_graph_funcs;
+	mutex_unlock(&graph_lock);
 
 	return ret;
 }
 
-static void ftrace_force_shutdown(void)
+static ssize_t
+ftrace_graph_read(struct file *file, char __user *ubuf,
+		       size_t cnt, loff_t *ppos)
 {
-	struct task_struct *task;
-	int command = FTRACE_DISABLE_CALLS | FTRACE_UPDATE_TRACE_FUNC;
+	if (file->f_mode & FMODE_READ)
+		return seq_read(file, ubuf, cnt, ppos);
+	else
+		return -EPERM;
+}
 
-	mutex_lock(&ftraced_lock);
-	task = ftraced_task;
-	ftraced_task = NULL;
-	ftraced_suspend = -1;
-	ftrace_run_update_code(command);
-	mutex_unlock(&ftraced_lock);
+static int
+ftrace_set_func(unsigned long *array, int idx, char *buffer)
+{
+	char str[KSYM_SYMBOL_LEN];
+	struct dyn_ftrace *rec;
+	struct ftrace_page *pg;
+	int found = 0;
+	int i, j;
+
+	if (ftrace_disabled)
+		return -ENODEV;
+
+	/* should not be called from interrupt context */
+	spin_lock(&ftrace_lock);
+
+	for (pg = ftrace_pages_start; pg; pg = pg->next) {
+		for (i = 0; i < pg->index; i++) {
+			rec = &pg->records[i];
+
+			if (rec->flags & (FTRACE_FL_FAILED | FTRACE_FL_FREE))
+				continue;
+
+			kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
+			if (strcmp(str, buffer) == 0) {
+				found = 1;
+				for (j = 0; j < idx; j++)
+					if (array[j] == rec->ip) {
+						found = 0;
+						break;
+					}
+				if (found)
+					array[idx] = rec->ip;
+				break;
+			}
+		}
+	}
+	spin_unlock(&ftrace_lock);
 
-	if (task)
-		kthread_stop(task);
+	return found ? 0 : -EINVAL;
 }
 
-static __init int ftrace_init_debugfs(void)
+static ssize_t
+ftrace_graph_write(struct file *file, const char __user *ubuf,
+		   size_t cnt, loff_t *ppos)
 {
-	struct dentry *d_tracer;
-	struct dentry *entry;
+	unsigned char buffer[FTRACE_BUFF_MAX+1];
+	unsigned long *array;
+	size_t read = 0;
+	ssize_t ret;
+	int index = 0;
+	char ch;
 
-	d_tracer = tracing_init_dentry();
+	if (!cnt || cnt < 0)
+		return 0;
+
+	mutex_lock(&graph_lock);
+
+	if (ftrace_graph_count >= FTRACE_GRAPH_MAX_FUNCS) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	if (file->f_mode & FMODE_READ) {
+		struct seq_file *m = file->private_data;
+		array = m->private;
+	} else
+		array = file->private_data;
+
+	ret = get_user(ch, ubuf++);
+	if (ret)
+		goto out;
+	read++;
+	cnt--;
+
+	/* skip white space */
+	while (cnt && isspace(ch)) {
+		ret = get_user(ch, ubuf++);
+		if (ret)
+			goto out;
+		read++;
+		cnt--;
+	}
+
+	if (isspace(ch)) {
+		*ppos += read;
+		ret = read;
+		goto out;
+	}
+
+	while (cnt && !isspace(ch)) {
+		if (index < FTRACE_BUFF_MAX)
+			buffer[index++] = ch;
+		else {
+			ret = -EINVAL;
+			goto out;
+		}
+		ret = get_user(ch, ubuf++);
+		if (ret)
+			goto out;
+		read++;
+		cnt--;
+	}
+	buffer[index] = 0;
+
+	/* we allow only one at a time */
+	ret = ftrace_set_func(array, ftrace_graph_count, buffer);
+	if (ret)
+		goto out;
+
+	ftrace_graph_count++;
+
+	file->f_pos += read;
+
+	ret = read;
+ out:
+	mutex_unlock(&graph_lock);
+
+	return ret;
+}
+
+static const struct file_operations ftrace_graph_fops = {
+	.open = ftrace_graph_open,
+	.read = ftrace_graph_read,
+	.write = ftrace_graph_write,
+};
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
+static __init int ftrace_init_dyn_debugfs(struct dentry *d_tracer)
+{
+	struct dentry *entry;
 
 	entry = debugfs_create_file("available_filter_functions", 0444,
 				    d_tracer, NULL, &ftrace_avail_fops);
@@ -1546,97 +1583,295 @@ static __init int ftrace_init_debugfs(void)
 		pr_warning("Could not create debugfs "
 			   "'set_ftrace_notrace' entry\n");
 
-	entry = debugfs_create_file("ftraced_enabled", 0644, d_tracer,
-				    NULL, &ftraced_fops);
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+	entry = debugfs_create_file("set_graph_function", 0444, d_tracer,
+				    NULL,
+				    &ftrace_graph_fops);
 	if (!entry)
 		pr_warning("Could not create debugfs "
-			   "'ftraced_enabled' entry\n");
+			   "'set_graph_function' entry\n");
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
 	return 0;
 }
 
-fs_initcall(ftrace_init_debugfs);
-
-static int __init ftrace_dynamic_init(void)
+static int ftrace_convert_nops(struct module *mod,
+			       unsigned long *start,
+			       unsigned long *end)
 {
-	struct task_struct *p;
+	unsigned long *p;
 	unsigned long addr;
+	unsigned long flags;
+
+	mutex_lock(&ftrace_start_lock);
+	p = start;
+	while (p < end) {
+		addr = ftrace_call_adjust(*p++);
+		/*
+		 * Some architecture linkers will pad between
+		 * the different mcount_loc sections of different
+		 * object files to satisfy alignments.
+		 * Skip any NULL pointers.
+		 */
+		if (!addr)
+			continue;
+		ftrace_record_ip(addr);
+	}
+
+	/* disable interrupts to prevent kstop machine */
+	local_irq_save(flags);
+	ftrace_update_code(mod);
+	local_irq_restore(flags);
+	mutex_unlock(&ftrace_start_lock);
+
+	return 0;
+}
+
+void ftrace_init_module(struct module *mod,
+			unsigned long *start, unsigned long *end)
+{
+	if (ftrace_disabled || start == end)
+		return;
+	ftrace_convert_nops(mod, start, end);
+}
+
+extern unsigned long __start_mcount_loc[];
+extern unsigned long __stop_mcount_loc[];
+
+void __init ftrace_init(void)
+{
+	unsigned long count, addr, flags;
 	int ret;
 
-	addr = (unsigned long)ftrace_record_ip;
+	/* Keep the ftrace pointer to the stub */
+	addr = (unsigned long)ftrace_stub;
 
-	stop_machine(ftrace_dyn_arch_init, &addr, NULL);
+	local_irq_save(flags);
+	ftrace_dyn_arch_init(&addr);
+	local_irq_restore(flags);
 
 	/* ftrace_dyn_arch_init places the return code in addr */
-	if (addr) {
-		ret = (int)addr;
+	if (addr)
 		goto failed;
-	}
 
-	ret = ftrace_dyn_table_alloc();
-	if (ret)
-		goto failed;
+	count = __stop_mcount_loc - __start_mcount_loc;
 
-	p = kthread_run(ftraced, NULL, "ftraced");
-	if (IS_ERR(p)) {
-		ret = -1;
+	ret = ftrace_dyn_table_alloc(count);
+	if (ret)
 		goto failed;
-	}
 
 	last_ftrace_enabled = ftrace_enabled = 1;
-	ftraced_task = p;
 
-	return 0;
+	ret = ftrace_convert_nops(NULL,
+				  __start_mcount_loc,
+				  __stop_mcount_loc);
 
+	return;
  failed:
 	ftrace_disabled = 1;
-	return ret;
 }
 
-core_initcall(ftrace_dynamic_init);
 #else
-# define ftrace_startup()		do { } while (0)
-# define ftrace_shutdown()		do { } while (0)
+
+static int __init ftrace_nodyn_init(void)
+{
+	ftrace_enabled = 1;
+	return 0;
+}
+device_initcall(ftrace_nodyn_init);
+
+static inline int ftrace_init_dyn_debugfs(struct dentry *d_tracer) { return 0; }
+static inline void ftrace_startup_enable(int command) { }
+/* Keep as macros so we do not need to define the commands */
+# define ftrace_startup(command)	do { } while (0)
+# define ftrace_shutdown(command)	do { } while (0)
 # define ftrace_startup_sysctl()	do { } while (0)
 # define ftrace_shutdown_sysctl()	do { } while (0)
-# define ftrace_force_shutdown()	do { } while (0)
 #endif /* CONFIG_DYNAMIC_FTRACE */
 
-/**
- * ftrace_kill_atomic - kill ftrace from critical sections
- *
- * This function should be used by panic code. It stops ftrace
- * but in a not so nice way. If you need to simply kill ftrace
- * from a non-atomic section, use ftrace_kill.
- */
-void ftrace_kill_atomic(void)
+static ssize_t
+ftrace_pid_read(struct file *file, char __user *ubuf,
+		       size_t cnt, loff_t *ppos)
 {
-	ftrace_disabled = 1;
-	ftrace_enabled = 0;
-#ifdef CONFIG_DYNAMIC_FTRACE
-	ftraced_suspend = -1;
-#endif
-	clear_ftrace_function();
+	char buf[64];
+	int r;
+
+	if (ftrace_pid_trace == ftrace_swapper_pid)
+		r = sprintf(buf, "swapper tasks\n");
+	else if (ftrace_pid_trace)
+		r = sprintf(buf, "%u\n", pid_nr(ftrace_pid_trace));
+	else
+		r = sprintf(buf, "no pid\n");
+
+	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+}
+
+static void clear_ftrace_swapper(void)
+{
+	struct task_struct *p;
+	int cpu;
+
+	get_online_cpus();
+	for_each_online_cpu(cpu) {
+		p = idle_task(cpu);
+		clear_tsk_trace_trace(p);
+	}
+	put_online_cpus();
+}
+
+static void set_ftrace_swapper(void)
+{
+	struct task_struct *p;
+	int cpu;
+
+	get_online_cpus();
+	for_each_online_cpu(cpu) {
+		p = idle_task(cpu);
+		set_tsk_trace_trace(p);
+	}
+	put_online_cpus();
+}
+
+static void clear_ftrace_pid(struct pid *pid)
+{
+	struct task_struct *p;
+
+	do_each_pid_task(pid, PIDTYPE_PID, p) {
+		clear_tsk_trace_trace(p);
+	} while_each_pid_task(pid, PIDTYPE_PID, p);
+	put_pid(pid);
+}
+
+static void set_ftrace_pid(struct pid *pid)
+{
+	struct task_struct *p;
+
+	do_each_pid_task(pid, PIDTYPE_PID, p) {
+		set_tsk_trace_trace(p);
+	} while_each_pid_task(pid, PIDTYPE_PID, p);
+}
+
+static void clear_ftrace_pid_task(struct pid **pid)
+{
+	if (*pid == ftrace_swapper_pid)
+		clear_ftrace_swapper();
+	else
+		clear_ftrace_pid(*pid);
+
+	*pid = NULL;
+}
+
+static void set_ftrace_pid_task(struct pid *pid)
+{
+	if (pid == ftrace_swapper_pid)
+		set_ftrace_swapper();
+	else
+		set_ftrace_pid(pid);
+}
+
+static ssize_t
+ftrace_pid_write(struct file *filp, const char __user *ubuf,
+		   size_t cnt, loff_t *ppos)
+{
+	struct pid *pid;
+	char buf[64];
+	long val;
+	int ret;
+
+	if (cnt >= sizeof(buf))
+		return -EINVAL;
+
+	if (copy_from_user(&buf, ubuf, cnt))
+		return -EFAULT;
+
+	buf[cnt] = 0;
+
+	ret = strict_strtol(buf, 10, &val);
+	if (ret < 0)
+		return ret;
+
+	mutex_lock(&ftrace_start_lock);
+	if (val < 0) {
+		/* disable pid tracing */
+		if (!ftrace_pid_trace)
+			goto out;
+
+		clear_ftrace_pid_task(&ftrace_pid_trace);
+
+	} else {
+		/* swapper task is special */
+		if (!val) {
+			pid = ftrace_swapper_pid;
+			if (pid == ftrace_pid_trace)
+				goto out;
+		} else {
+			pid = find_get_pid(val);
+
+			if (pid == ftrace_pid_trace) {
+				put_pid(pid);
+				goto out;
+			}
+		}
+
+		if (ftrace_pid_trace)
+			clear_ftrace_pid_task(&ftrace_pid_trace);
+
+		if (!pid)
+			goto out;
+
+		ftrace_pid_trace = pid;
+
+		set_ftrace_pid_task(ftrace_pid_trace);
+	}
+
+	/* update the function call */
+	ftrace_update_pid_func();
+	ftrace_startup_enable(0);
+
+ out:
+	mutex_unlock(&ftrace_start_lock);
+
+	return cnt;
 }
 
+static struct file_operations ftrace_pid_fops = {
+	.read = ftrace_pid_read,
+	.write = ftrace_pid_write,
+};
+
+static __init int ftrace_init_debugfs(void)
+{
+	struct dentry *d_tracer;
+	struct dentry *entry;
+
+	d_tracer = tracing_init_dentry();
+	if (!d_tracer)
+		return 0;
+
+	ftrace_init_dyn_debugfs(d_tracer);
+
+	entry = debugfs_create_file("set_ftrace_pid", 0644, d_tracer,
+				    NULL, &ftrace_pid_fops);
+	if (!entry)
+		pr_warning("Could not create debugfs "
+			   "'set_ftrace_pid' entry\n");
+	return 0;
+}
+
+fs_initcall(ftrace_init_debugfs);
+
 /**
- * ftrace_kill - totally shutdown ftrace
+ * ftrace_kill - kill ftrace
  *
- * This is a safety measure. If something was detected that seems
- * wrong, calling this function will keep ftrace from doing
- * any more modifications, and updates.
- * used when something went wrong.
+ * This function should be used by panic code. It stops ftrace
+ * but in a not so nice way. If you need to simply kill ftrace
+ * from a non-atomic section, use ftrace_kill.
  */
 void ftrace_kill(void)
 {
-	mutex_lock(&ftrace_sysctl_lock);
 	ftrace_disabled = 1;
 	ftrace_enabled = 0;
-
 	clear_ftrace_function();
-	mutex_unlock(&ftrace_sysctl_lock);
-
-	/* Try to totally disable ftrace */
-	ftrace_force_shutdown();
 }
 
 /**
@@ -1658,10 +1893,11 @@ int register_ftrace_function(struct ftrace_ops *ops)
 		return -1;
 
 	mutex_lock(&ftrace_sysctl_lock);
+
 	ret = __register_ftrace_function(ops);
-	ftrace_startup();
-	mutex_unlock(&ftrace_sysctl_lock);
+	ftrace_startup(0);
 
+	mutex_unlock(&ftrace_sysctl_lock);
 	return ret;
 }
 
@@ -1677,7 +1913,7 @@ int unregister_ftrace_function(struct ftrace_ops *ops)
 
 	mutex_lock(&ftrace_sysctl_lock);
 	ret = __unregister_ftrace_function(ops);
-	ftrace_shutdown();
+	ftrace_shutdown(0);
 	mutex_unlock(&ftrace_sysctl_lock);
 
 	return ret;
@@ -1725,3 +1961,154 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
 	mutex_unlock(&ftrace_sysctl_lock);
 	return ret;
 }
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+
+static atomic_t ftrace_graph_active;
+
+int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace)
+{
+	return 0;
+}
+
+/* The callbacks that hook a function */
+trace_func_graph_ret_t ftrace_graph_return =
+			(trace_func_graph_ret_t)ftrace_stub;
+trace_func_graph_ent_t ftrace_graph_entry = ftrace_graph_entry_stub;
+
+/* Try to assign a return stack array on FTRACE_RETSTACK_ALLOC_SIZE tasks. */
+static int alloc_retstack_tasklist(struct ftrace_ret_stack **ret_stack_list)
+{
+	int i;
+	int ret = 0;
+	unsigned long flags;
+	int start = 0, end = FTRACE_RETSTACK_ALLOC_SIZE;
+	struct task_struct *g, *t;
+
+	for (i = 0; i < FTRACE_RETSTACK_ALLOC_SIZE; i++) {
+		ret_stack_list[i] = kmalloc(FTRACE_RETFUNC_DEPTH
+					* sizeof(struct ftrace_ret_stack),
+					GFP_KERNEL);
+		if (!ret_stack_list[i]) {
+			start = 0;
+			end = i;
+			ret = -ENOMEM;
+			goto free;
+		}
+	}
+
+	read_lock_irqsave(&tasklist_lock, flags);
+	do_each_thread(g, t) {
+		if (start == end) {
+			ret = -EAGAIN;
+			goto unlock;
+		}
+
+		if (t->ret_stack == NULL) {
+			t->curr_ret_stack = -1;
+			/* Make sure IRQs see the -1 first: */
+			barrier();
+			t->ret_stack = ret_stack_list[start++];
+			atomic_set(&t->tracing_graph_pause, 0);
+			atomic_set(&t->trace_overrun, 0);
+		}
+	} while_each_thread(g, t);
+
+unlock:
+	read_unlock_irqrestore(&tasklist_lock, flags);
+free:
+	for (i = start; i < end; i++)
+		kfree(ret_stack_list[i]);
+	return ret;
+}
+
+/* Allocate a return stack for each task */
+static int start_graph_tracing(void)
+{
+	struct ftrace_ret_stack **ret_stack_list;
+	int ret;
+
+	ret_stack_list = kmalloc(FTRACE_RETSTACK_ALLOC_SIZE *
+				sizeof(struct ftrace_ret_stack *),
+				GFP_KERNEL);
+
+	if (!ret_stack_list)
+		return -ENOMEM;
+
+	do {
+		ret = alloc_retstack_tasklist(ret_stack_list);
+	} while (ret == -EAGAIN);
+
+	kfree(ret_stack_list);
+	return ret;
+}
+
+int register_ftrace_graph(trace_func_graph_ret_t retfunc,
+			trace_func_graph_ent_t entryfunc)
+{
+	int ret = 0;
+
+	mutex_lock(&ftrace_sysctl_lock);
+
+	atomic_inc(&ftrace_graph_active);
+	ret = start_graph_tracing();
+	if (ret) {
+		atomic_dec(&ftrace_graph_active);
+		goto out;
+	}
+
+	ftrace_graph_return = retfunc;
+	ftrace_graph_entry = entryfunc;
+
+	ftrace_startup(FTRACE_START_FUNC_RET);
+
+out:
+	mutex_unlock(&ftrace_sysctl_lock);
+	return ret;
+}
+
+void unregister_ftrace_graph(void)
+{
+	mutex_lock(&ftrace_sysctl_lock);
+
+	atomic_dec(&ftrace_graph_active);
+	ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub;
+	ftrace_graph_entry = ftrace_graph_entry_stub;
+	ftrace_shutdown(FTRACE_STOP_FUNC_RET);
+
+	mutex_unlock(&ftrace_sysctl_lock);
+}
+
+/* Allocate a return stack for newly created task */
+void ftrace_graph_init_task(struct task_struct *t)
+{
+	if (atomic_read(&ftrace_graph_active)) {
+		t->ret_stack = kmalloc(FTRACE_RETFUNC_DEPTH
+				* sizeof(struct ftrace_ret_stack),
+				GFP_KERNEL);
+		if (!t->ret_stack)
+			return;
+		t->curr_ret_stack = -1;
+		atomic_set(&t->tracing_graph_pause, 0);
+		atomic_set(&t->trace_overrun, 0);
+	} else
+		t->ret_stack = NULL;
+}
+
+void ftrace_graph_exit_task(struct task_struct *t)
+{
+	struct ftrace_ret_stack	*ret_stack = t->ret_stack;
+
+	t->ret_stack = NULL;
+	/* NULL must become visible to IRQs before we free it: */
+	barrier();
+
+	kfree(ret_stack);
+}
+
+void ftrace_graph_stop(void)
+{
+	ftrace_stop();
+}
+#endif
+
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
new file mode 100644
index 000000000000..1d601a7c4587
--- /dev/null
+++ b/kernel/trace/ring_buffer.c
@@ -0,0 +1,2517 @@
+/*
+ * Generic ring buffer
+ *
+ * Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com>
+ */
+#include <linux/ring_buffer.h>
+#include <linux/spinlock.h>
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/percpu.h>
+#include <linux/mutex.h>
+#include <linux/sched.h>	/* used for sched_clock() (for now) */
+#include <linux/init.h>
+#include <linux/hash.h>
+#include <linux/list.h>
+#include <linux/fs.h>
+
+#include "trace.h"
+
+/*
+ * A fast way to enable or disable all ring buffers is to
+ * call tracing_on or tracing_off. Turning off the ring buffers
+ * prevents all ring buffers from being recorded to.
+ * Turning this switch on, makes it OK to write to the
+ * ring buffer, if the ring buffer is enabled itself.
+ *
+ * There's three layers that must be on in order to write
+ * to the ring buffer.
+ *
+ * 1) This global flag must be set.
+ * 2) The ring buffer must be enabled for recording.
+ * 3) The per cpu buffer must be enabled for recording.
+ *
+ * In case of an anomaly, this global flag has a bit set that
+ * will permantly disable all ring buffers.
+ */
+
+/*
+ * Global flag to disable all recording to ring buffers
+ *  This has two bits: ON, DISABLED
+ *
+ *  ON   DISABLED
+ * ---- ----------
+ *   0      0        : ring buffers are off
+ *   1      0        : ring buffers are on
+ *   X      1        : ring buffers are permanently disabled
+ */
+
+enum {
+	RB_BUFFERS_ON_BIT	= 0,
+	RB_BUFFERS_DISABLED_BIT	= 1,
+};
+
+enum {
+	RB_BUFFERS_ON		= 1 << RB_BUFFERS_ON_BIT,
+	RB_BUFFERS_DISABLED	= 1 << RB_BUFFERS_DISABLED_BIT,
+};
+
+static long ring_buffer_flags __read_mostly = RB_BUFFERS_ON;
+
+/**
+ * tracing_on - enable all tracing buffers
+ *
+ * This function enables all tracing buffers that may have been
+ * disabled with tracing_off.
+ */
+void tracing_on(void)
+{
+	set_bit(RB_BUFFERS_ON_BIT, &ring_buffer_flags);
+}
+EXPORT_SYMBOL_GPL(tracing_on);
+
+/**
+ * tracing_off - turn off all tracing buffers
+ *
+ * This function stops all tracing buffers from recording data.
+ * It does not disable any overhead the tracers themselves may
+ * be causing. This function simply causes all recording to
+ * the ring buffers to fail.
+ */
+void tracing_off(void)
+{
+	clear_bit(RB_BUFFERS_ON_BIT, &ring_buffer_flags);
+}
+EXPORT_SYMBOL_GPL(tracing_off);
+
+/**
+ * tracing_off_permanent - permanently disable ring buffers
+ *
+ * This function, once called, will disable all ring buffers
+ * permanenty.
+ */
+void tracing_off_permanent(void)
+{
+	set_bit(RB_BUFFERS_DISABLED_BIT, &ring_buffer_flags);
+}
+
+#include "trace.h"
+
+/* Up this if you want to test the TIME_EXTENTS and normalization */
+#define DEBUG_SHIFT 0
+
+/* FIXME!!! */
+u64 ring_buffer_time_stamp(int cpu)
+{
+	u64 time;
+
+	preempt_disable_notrace();
+	/* shift to debug/test normalization and TIME_EXTENTS */
+	time = sched_clock() << DEBUG_SHIFT;
+	preempt_enable_no_resched_notrace();
+
+	return time;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_time_stamp);
+
+void ring_buffer_normalize_time_stamp(int cpu, u64 *ts)
+{
+	/* Just stupid testing the normalize function and deltas */
+	*ts >>= DEBUG_SHIFT;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_normalize_time_stamp);
+
+#define RB_EVNT_HDR_SIZE (sizeof(struct ring_buffer_event))
+#define RB_ALIGNMENT_SHIFT	2
+#define RB_ALIGNMENT		(1 << RB_ALIGNMENT_SHIFT)
+#define RB_MAX_SMALL_DATA	28
+
+enum {
+	RB_LEN_TIME_EXTEND = 8,
+	RB_LEN_TIME_STAMP = 16,
+};
+
+/* inline for ring buffer fast paths */
+static inline unsigned
+rb_event_length(struct ring_buffer_event *event)
+{
+	unsigned length;
+
+	switch (event->type) {
+	case RINGBUF_TYPE_PADDING:
+		/* undefined */
+		return -1;
+
+	case RINGBUF_TYPE_TIME_EXTEND:
+		return RB_LEN_TIME_EXTEND;
+
+	case RINGBUF_TYPE_TIME_STAMP:
+		return RB_LEN_TIME_STAMP;
+
+	case RINGBUF_TYPE_DATA:
+		if (event->len)
+			length = event->len << RB_ALIGNMENT_SHIFT;
+		else
+			length = event->array[0];
+		return length + RB_EVNT_HDR_SIZE;
+	default:
+		BUG();
+	}
+	/* not hit */
+	return 0;
+}
+
+/**
+ * ring_buffer_event_length - return the length of the event
+ * @event: the event to get the length of
+ */
+unsigned ring_buffer_event_length(struct ring_buffer_event *event)
+{
+	return rb_event_length(event);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_event_length);
+
+/* inline for ring buffer fast paths */
+static inline void *
+rb_event_data(struct ring_buffer_event *event)
+{
+	BUG_ON(event->type != RINGBUF_TYPE_DATA);
+	/* If length is in len field, then array[0] has the data */
+	if (event->len)
+		return (void *)&event->array[0];
+	/* Otherwise length is in array[0] and array[1] has the data */
+	return (void *)&event->array[1];
+}
+
+/**
+ * ring_buffer_event_data - return the data of the event
+ * @event: the event to get the data from
+ */
+void *ring_buffer_event_data(struct ring_buffer_event *event)
+{
+	return rb_event_data(event);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_event_data);
+
+#define for_each_buffer_cpu(buffer, cpu)		\
+	for_each_cpu_mask(cpu, buffer->cpumask)
+
+#define TS_SHIFT	27
+#define TS_MASK		((1ULL << TS_SHIFT) - 1)
+#define TS_DELTA_TEST	(~TS_MASK)
+
+struct buffer_data_page {
+	u64		 time_stamp;	/* page time stamp */
+	local_t		 commit;	/* write commited index */
+	unsigned char	 data[];	/* data of buffer page */
+};
+
+struct buffer_page {
+	local_t		 write;		/* index for next write */
+	unsigned	 read;		/* index for next read */
+	struct list_head list;		/* list of free pages */
+	struct buffer_data_page *page;	/* Actual data page */
+};
+
+static void rb_init_page(struct buffer_data_page *bpage)
+{
+	local_set(&bpage->commit, 0);
+}
+
+/*
+ * Also stolen from mm/slob.c. Thanks to Mathieu Desnoyers for pointing
+ * this issue out.
+ */
+static inline void free_buffer_page(struct buffer_page *bpage)
+{
+	if (bpage->page)
+		free_page((unsigned long)bpage->page);
+	kfree(bpage);
+}
+
+/*
+ * We need to fit the time_stamp delta into 27 bits.
+ */
+static inline int test_time_stamp(u64 delta)
+{
+	if (delta & TS_DELTA_TEST)
+		return 1;
+	return 0;
+}
+
+#define BUF_PAGE_SIZE (PAGE_SIZE - sizeof(struct buffer_data_page))
+
+/*
+ * head_page == tail_page && head == tail then buffer is empty.
+ */
+struct ring_buffer_per_cpu {
+	int				cpu;
+	struct ring_buffer		*buffer;
+	spinlock_t			reader_lock; /* serialize readers */
+	raw_spinlock_t			lock;
+	struct lock_class_key		lock_key;
+	struct list_head		pages;
+	struct buffer_page		*head_page;	/* read from head */
+	struct buffer_page		*tail_page;	/* write to tail */
+	struct buffer_page		*commit_page;	/* commited pages */
+	struct buffer_page		*reader_page;
+	unsigned long			overrun;
+	unsigned long			entries;
+	u64				write_stamp;
+	u64				read_stamp;
+	atomic_t			record_disabled;
+};
+
+struct ring_buffer {
+	unsigned			pages;
+	unsigned			flags;
+	int				cpus;
+	cpumask_t			cpumask;
+	atomic_t			record_disabled;
+
+	struct mutex			mutex;
+
+	struct ring_buffer_per_cpu	**buffers;
+};
+
+struct ring_buffer_iter {
+	struct ring_buffer_per_cpu	*cpu_buffer;
+	unsigned long			head;
+	struct buffer_page		*head_page;
+	u64				read_stamp;
+};
+
+/* buffer may be either ring_buffer or ring_buffer_per_cpu */
+#define RB_WARN_ON(buffer, cond)				\
+	({							\
+		int _____ret = unlikely(cond);			\
+		if (_____ret) {					\
+			atomic_inc(&buffer->record_disabled);	\
+			WARN_ON(1);				\
+		}						\
+		_____ret;					\
+	})
+
+/**
+ * check_pages - integrity check of buffer pages
+ * @cpu_buffer: CPU buffer with pages to test
+ *
+ * As a safty measure we check to make sure the data pages have not
+ * been corrupted.
+ */
+static int rb_check_pages(struct ring_buffer_per_cpu *cpu_buffer)
+{
+	struct list_head *head = &cpu_buffer->pages;
+	struct buffer_page *bpage, *tmp;
+
+	if (RB_WARN_ON(cpu_buffer, head->next->prev != head))
+		return -1;
+	if (RB_WARN_ON(cpu_buffer, head->prev->next != head))
+		return -1;
+
+	list_for_each_entry_safe(bpage, tmp, head, list) {
+		if (RB_WARN_ON(cpu_buffer,
+			       bpage->list.next->prev != &bpage->list))
+			return -1;
+		if (RB_WARN_ON(cpu_buffer,
+			       bpage->list.prev->next != &bpage->list))
+			return -1;
+	}
+
+	return 0;
+}
+
+static int rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer,
+			     unsigned nr_pages)
+{
+	struct list_head *head = &cpu_buffer->pages;
+	struct buffer_page *bpage, *tmp;
+	unsigned long addr;
+	LIST_HEAD(pages);
+	unsigned i;
+
+	for (i = 0; i < nr_pages; i++) {
+		bpage = kzalloc_node(ALIGN(sizeof(*bpage), cache_line_size()),
+				    GFP_KERNEL, cpu_to_node(cpu_buffer->cpu));
+		if (!bpage)
+			goto free_pages;
+		list_add(&bpage->list, &pages);
+
+		addr = __get_free_page(GFP_KERNEL);
+		if (!addr)
+			goto free_pages;
+		bpage->page = (void *)addr;
+		rb_init_page(bpage->page);
+	}
+
+	list_splice(&pages, head);
+
+	rb_check_pages(cpu_buffer);
+
+	return 0;
+
+ free_pages:
+	list_for_each_entry_safe(bpage, tmp, &pages, list) {
+		list_del_init(&bpage->list);
+		free_buffer_page(bpage);
+	}
+	return -ENOMEM;
+}
+
+static struct ring_buffer_per_cpu *
+rb_allocate_cpu_buffer(struct ring_buffer *buffer, int cpu)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+	struct buffer_page *bpage;
+	unsigned long addr;
+	int ret;
+
+	cpu_buffer = kzalloc_node(ALIGN(sizeof(*cpu_buffer), cache_line_size()),
+				  GFP_KERNEL, cpu_to_node(cpu));
+	if (!cpu_buffer)
+		return NULL;
+
+	cpu_buffer->cpu = cpu;
+	cpu_buffer->buffer = buffer;
+	spin_lock_init(&cpu_buffer->reader_lock);
+	cpu_buffer->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
+	INIT_LIST_HEAD(&cpu_buffer->pages);
+
+	bpage = kzalloc_node(ALIGN(sizeof(*bpage), cache_line_size()),
+			    GFP_KERNEL, cpu_to_node(cpu));
+	if (!bpage)
+		goto fail_free_buffer;
+
+	cpu_buffer->reader_page = bpage;
+	addr = __get_free_page(GFP_KERNEL);
+	if (!addr)
+		goto fail_free_reader;
+	bpage->page = (void *)addr;
+	rb_init_page(bpage->page);
+
+	INIT_LIST_HEAD(&cpu_buffer->reader_page->list);
+
+	ret = rb_allocate_pages(cpu_buffer, buffer->pages);
+	if (ret < 0)
+		goto fail_free_reader;
+
+	cpu_buffer->head_page
+		= list_entry(cpu_buffer->pages.next, struct buffer_page, list);
+	cpu_buffer->tail_page = cpu_buffer->commit_page = cpu_buffer->head_page;
+
+	return cpu_buffer;
+
+ fail_free_reader:
+	free_buffer_page(cpu_buffer->reader_page);
+
+ fail_free_buffer:
+	kfree(cpu_buffer);
+	return NULL;
+}
+
+static void rb_free_cpu_buffer(struct ring_buffer_per_cpu *cpu_buffer)
+{
+	struct list_head *head = &cpu_buffer->pages;
+	struct buffer_page *bpage, *tmp;
+
+	list_del_init(&cpu_buffer->reader_page->list);
+	free_buffer_page(cpu_buffer->reader_page);
+
+	list_for_each_entry_safe(bpage, tmp, head, list) {
+		list_del_init(&bpage->list);
+		free_buffer_page(bpage);
+	}
+	kfree(cpu_buffer);
+}
+
+/*
+ * Causes compile errors if the struct buffer_page gets bigger
+ * than the struct page.
+ */
+extern int ring_buffer_page_too_big(void);
+
+/**
+ * ring_buffer_alloc - allocate a new ring_buffer
+ * @size: the size in bytes per cpu that is needed.
+ * @flags: attributes to set for the ring buffer.
+ *
+ * Currently the only flag that is available is the RB_FL_OVERWRITE
+ * flag. This flag means that the buffer will overwrite old data
+ * when the buffer wraps. If this flag is not set, the buffer will
+ * drop data when the tail hits the head.
+ */
+struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
+{
+	struct ring_buffer *buffer;
+	int bsize;
+	int cpu;
+
+	/* Paranoid! Optimizes out when all is well */
+	if (sizeof(struct buffer_page) > sizeof(struct page))
+		ring_buffer_page_too_big();
+
+
+	/* keep it in its own cache line */
+	buffer = kzalloc(ALIGN(sizeof(*buffer), cache_line_size()),
+			 GFP_KERNEL);
+	if (!buffer)
+		return NULL;
+
+	buffer->pages = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
+	buffer->flags = flags;
+
+	/* need at least two pages */
+	if (buffer->pages == 1)
+		buffer->pages++;
+
+	buffer->cpumask = cpu_possible_map;
+	buffer->cpus = nr_cpu_ids;
+
+	bsize = sizeof(void *) * nr_cpu_ids;
+	buffer->buffers = kzalloc(ALIGN(bsize, cache_line_size()),
+				  GFP_KERNEL);
+	if (!buffer->buffers)
+		goto fail_free_buffer;
+
+	for_each_buffer_cpu(buffer, cpu) {
+		buffer->buffers[cpu] =
+			rb_allocate_cpu_buffer(buffer, cpu);
+		if (!buffer->buffers[cpu])
+			goto fail_free_buffers;
+	}
+
+	mutex_init(&buffer->mutex);
+
+	return buffer;
+
+ fail_free_buffers:
+	for_each_buffer_cpu(buffer, cpu) {
+		if (buffer->buffers[cpu])
+			rb_free_cpu_buffer(buffer->buffers[cpu]);
+	}
+	kfree(buffer->buffers);
+
+ fail_free_buffer:
+	kfree(buffer);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_alloc);
+
+/**
+ * ring_buffer_free - free a ring buffer.
+ * @buffer: the buffer to free.
+ */
+void
+ring_buffer_free(struct ring_buffer *buffer)
+{
+	int cpu;
+
+	for_each_buffer_cpu(buffer, cpu)
+		rb_free_cpu_buffer(buffer->buffers[cpu]);
+
+	kfree(buffer);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_free);
+
+static void rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer);
+
+static void
+rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned nr_pages)
+{
+	struct buffer_page *bpage;
+	struct list_head *p;
+	unsigned i;
+
+	atomic_inc(&cpu_buffer->record_disabled);
+	synchronize_sched();
+
+	for (i = 0; i < nr_pages; i++) {
+		if (RB_WARN_ON(cpu_buffer, list_empty(&cpu_buffer->pages)))
+			return;
+		p = cpu_buffer->pages.next;
+		bpage = list_entry(p, struct buffer_page, list);
+		list_del_init(&bpage->list);
+		free_buffer_page(bpage);
+	}
+	if (RB_WARN_ON(cpu_buffer, list_empty(&cpu_buffer->pages)))
+		return;
+
+	rb_reset_cpu(cpu_buffer);
+
+	rb_check_pages(cpu_buffer);
+
+	atomic_dec(&cpu_buffer->record_disabled);
+
+}
+
+static void
+rb_insert_pages(struct ring_buffer_per_cpu *cpu_buffer,
+		struct list_head *pages, unsigned nr_pages)
+{
+	struct buffer_page *bpage;
+	struct list_head *p;
+	unsigned i;
+
+	atomic_inc(&cpu_buffer->record_disabled);
+	synchronize_sched();
+
+	for (i = 0; i < nr_pages; i++) {
+		if (RB_WARN_ON(cpu_buffer, list_empty(pages)))
+			return;
+		p = pages->next;
+		bpage = list_entry(p, struct buffer_page, list);
+		list_del_init(&bpage->list);
+		list_add_tail(&bpage->list, &cpu_buffer->pages);
+	}
+	rb_reset_cpu(cpu_buffer);
+
+	rb_check_pages(cpu_buffer);
+
+	atomic_dec(&cpu_buffer->record_disabled);
+}
+
+/**
+ * ring_buffer_resize - resize the ring buffer
+ * @buffer: the buffer to resize.
+ * @size: the new size.
+ *
+ * The tracer is responsible for making sure that the buffer is
+ * not being used while changing the size.
+ * Note: We may be able to change the above requirement by using
+ *  RCU synchronizations.
+ *
+ * Minimum size is 2 * BUF_PAGE_SIZE.
+ *
+ * Returns -1 on failure.
+ */
+int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+	unsigned nr_pages, rm_pages, new_pages;
+	struct buffer_page *bpage, *tmp;
+	unsigned long buffer_size;
+	unsigned long addr;
+	LIST_HEAD(pages);
+	int i, cpu;
+
+	/*
+	 * Always succeed at resizing a non-existent buffer:
+	 */
+	if (!buffer)
+		return size;
+
+	size = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
+	size *= BUF_PAGE_SIZE;
+	buffer_size = buffer->pages * BUF_PAGE_SIZE;
+
+	/* we need a minimum of two pages */
+	if (size < BUF_PAGE_SIZE * 2)
+		size = BUF_PAGE_SIZE * 2;
+
+	if (size == buffer_size)
+		return size;
+
+	mutex_lock(&buffer->mutex);
+
+	nr_pages = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
+
+	if (size < buffer_size) {
+
+		/* easy case, just free pages */
+		if (RB_WARN_ON(buffer, nr_pages >= buffer->pages)) {
+			mutex_unlock(&buffer->mutex);
+			return -1;
+		}
+
+		rm_pages = buffer->pages - nr_pages;
+
+		for_each_buffer_cpu(buffer, cpu) {
+			cpu_buffer = buffer->buffers[cpu];
+			rb_remove_pages(cpu_buffer, rm_pages);
+		}
+		goto out;
+	}
+
+	/*
+	 * This is a bit more difficult. We only want to add pages
+	 * when we can allocate enough for all CPUs. We do this
+	 * by allocating all the pages and storing them on a local
+	 * link list. If we succeed in our allocation, then we
+	 * add these pages to the cpu_buffers. Otherwise we just free
+	 * them all and return -ENOMEM;
+	 */
+	if (RB_WARN_ON(buffer, nr_pages <= buffer->pages)) {
+		mutex_unlock(&buffer->mutex);
+		return -1;
+	}
+
+	new_pages = nr_pages - buffer->pages;
+
+	for_each_buffer_cpu(buffer, cpu) {
+		for (i = 0; i < new_pages; i++) {
+			bpage = kzalloc_node(ALIGN(sizeof(*bpage),
+						  cache_line_size()),
+					    GFP_KERNEL, cpu_to_node(cpu));
+			if (!bpage)
+				goto free_pages;
+			list_add(&bpage->list, &pages);
+			addr = __get_free_page(GFP_KERNEL);
+			if (!addr)
+				goto free_pages;
+			bpage->page = (void *)addr;
+			rb_init_page(bpage->page);
+		}
+	}
+
+	for_each_buffer_cpu(buffer, cpu) {
+		cpu_buffer = buffer->buffers[cpu];
+		rb_insert_pages(cpu_buffer, &pages, new_pages);
+	}
+
+	if (RB_WARN_ON(buffer, !list_empty(&pages))) {
+		mutex_unlock(&buffer->mutex);
+		return -1;
+	}
+
+ out:
+	buffer->pages = nr_pages;
+	mutex_unlock(&buffer->mutex);
+
+	return size;
+
+ free_pages:
+	list_for_each_entry_safe(bpage, tmp, &pages, list) {
+		list_del_init(&bpage->list);
+		free_buffer_page(bpage);
+	}
+	mutex_unlock(&buffer->mutex);
+	return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_resize);
+
+static inline int rb_null_event(struct ring_buffer_event *event)
+{
+	return event->type == RINGBUF_TYPE_PADDING;
+}
+
+static inline void *
+__rb_data_page_index(struct buffer_data_page *bpage, unsigned index)
+{
+	return bpage->data + index;
+}
+
+static inline void *__rb_page_index(struct buffer_page *bpage, unsigned index)
+{
+	return bpage->page->data + index;
+}
+
+static inline struct ring_buffer_event *
+rb_reader_event(struct ring_buffer_per_cpu *cpu_buffer)
+{
+	return __rb_page_index(cpu_buffer->reader_page,
+			       cpu_buffer->reader_page->read);
+}
+
+static inline struct ring_buffer_event *
+rb_head_event(struct ring_buffer_per_cpu *cpu_buffer)
+{
+	return __rb_page_index(cpu_buffer->head_page,
+			       cpu_buffer->head_page->read);
+}
+
+static inline struct ring_buffer_event *
+rb_iter_head_event(struct ring_buffer_iter *iter)
+{
+	return __rb_page_index(iter->head_page, iter->head);
+}
+
+static inline unsigned rb_page_write(struct buffer_page *bpage)
+{
+	return local_read(&bpage->write);
+}
+
+static inline unsigned rb_page_commit(struct buffer_page *bpage)
+{
+	return local_read(&bpage->page->commit);
+}
+
+/* Size is determined by what has been commited */
+static inline unsigned rb_page_size(struct buffer_page *bpage)
+{
+	return rb_page_commit(bpage);
+}
+
+static inline unsigned
+rb_commit_index(struct ring_buffer_per_cpu *cpu_buffer)
+{
+	return rb_page_commit(cpu_buffer->commit_page);
+}
+
+static inline unsigned rb_head_size(struct ring_buffer_per_cpu *cpu_buffer)
+{
+	return rb_page_commit(cpu_buffer->head_page);
+}
+
+/*
+ * When the tail hits the head and the buffer is in overwrite mode,
+ * the head jumps to the next page and all content on the previous
+ * page is discarded. But before doing so, we update the overrun
+ * variable of the buffer.
+ */
+static void rb_update_overflow(struct ring_buffer_per_cpu *cpu_buffer)
+{
+	struct ring_buffer_event *event;
+	unsigned long head;
+
+	for (head = 0; head < rb_head_size(cpu_buffer);
+	     head += rb_event_length(event)) {
+
+		event = __rb_page_index(cpu_buffer->head_page, head);
+		if (RB_WARN_ON(cpu_buffer, rb_null_event(event)))
+			return;
+		/* Only count data entries */
+		if (event->type != RINGBUF_TYPE_DATA)
+			continue;
+		cpu_buffer->overrun++;
+		cpu_buffer->entries--;
+	}
+}
+
+static inline void rb_inc_page(struct ring_buffer_per_cpu *cpu_buffer,
+			       struct buffer_page **bpage)
+{
+	struct list_head *p = (*bpage)->list.next;
+
+	if (p == &cpu_buffer->pages)
+		p = p->next;
+
+	*bpage = list_entry(p, struct buffer_page, list);
+}
+
+static inline unsigned
+rb_event_index(struct ring_buffer_event *event)
+{
+	unsigned long addr = (unsigned long)event;
+
+	return (addr & ~PAGE_MASK) - (PAGE_SIZE - BUF_PAGE_SIZE);
+}
+
+static inline int
+rb_is_commit(struct ring_buffer_per_cpu *cpu_buffer,
+	     struct ring_buffer_event *event)
+{
+	unsigned long addr = (unsigned long)event;
+	unsigned long index;
+
+	index = rb_event_index(event);
+	addr &= PAGE_MASK;
+
+	return cpu_buffer->commit_page->page == (void *)addr &&
+		rb_commit_index(cpu_buffer) == index;
+}
+
+static inline void
+rb_set_commit_event(struct ring_buffer_per_cpu *cpu_buffer,
+		    struct ring_buffer_event *event)
+{
+	unsigned long addr = (unsigned long)event;
+	unsigned long index;
+
+	index = rb_event_index(event);
+	addr &= PAGE_MASK;
+
+	while (cpu_buffer->commit_page->page != (void *)addr) {
+		if (RB_WARN_ON(cpu_buffer,
+			  cpu_buffer->commit_page == cpu_buffer->tail_page))
+			return;
+		cpu_buffer->commit_page->page->commit =
+			cpu_buffer->commit_page->write;
+		rb_inc_page(cpu_buffer, &cpu_buffer->commit_page);
+		cpu_buffer->write_stamp =
+			cpu_buffer->commit_page->page->time_stamp;
+	}
+
+	/* Now set the commit to the event's index */
+	local_set(&cpu_buffer->commit_page->page->commit, index);
+}
+
+static inline void
+rb_set_commit_to_write(struct ring_buffer_per_cpu *cpu_buffer)
+{
+	/*
+	 * We only race with interrupts and NMIs on this CPU.
+	 * If we own the commit event, then we can commit
+	 * all others that interrupted us, since the interruptions
+	 * are in stack format (they finish before they come
+	 * back to us). This allows us to do a simple loop to
+	 * assign the commit to the tail.
+	 */
+ again:
+	while (cpu_buffer->commit_page != cpu_buffer->tail_page) {
+		cpu_buffer->commit_page->page->commit =
+			cpu_buffer->commit_page->write;
+		rb_inc_page(cpu_buffer, &cpu_buffer->commit_page);
+		cpu_buffer->write_stamp =
+			cpu_buffer->commit_page->page->time_stamp;
+		/* add barrier to keep gcc from optimizing too much */
+		barrier();
+	}
+	while (rb_commit_index(cpu_buffer) !=
+	       rb_page_write(cpu_buffer->commit_page)) {
+		cpu_buffer->commit_page->page->commit =
+			cpu_buffer->commit_page->write;
+		barrier();
+	}
+
+	/* again, keep gcc from optimizing */
+	barrier();
+
+	/*
+	 * If an interrupt came in just after the first while loop
+	 * and pushed the tail page forward, we will be left with
+	 * a dangling commit that will never go forward.
+	 */
+	if (unlikely(cpu_buffer->commit_page != cpu_buffer->tail_page))
+		goto again;
+}
+
+static void rb_reset_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
+{
+	cpu_buffer->read_stamp = cpu_buffer->reader_page->page->time_stamp;
+	cpu_buffer->reader_page->read = 0;
+}
+
+static inline void rb_inc_iter(struct ring_buffer_iter *iter)
+{
+	struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+
+	/*
+	 * The iterator could be on the reader page (it starts there).
+	 * But the head could have moved, since the reader was
+	 * found. Check for this case and assign the iterator
+	 * to the head page instead of next.
+	 */
+	if (iter->head_page == cpu_buffer->reader_page)
+		iter->head_page = cpu_buffer->head_page;
+	else
+		rb_inc_page(cpu_buffer, &iter->head_page);
+
+	iter->read_stamp = iter->head_page->page->time_stamp;
+	iter->head = 0;
+}
+
+/**
+ * ring_buffer_update_event - update event type and data
+ * @event: the even to update
+ * @type: the type of event
+ * @length: the size of the event field in the ring buffer
+ *
+ * Update the type and data fields of the event. The length
+ * is the actual size that is written to the ring buffer,
+ * and with this, we can determine what to place into the
+ * data field.
+ */
+static inline void
+rb_update_event(struct ring_buffer_event *event,
+			 unsigned type, unsigned length)
+{
+	event->type = type;
+
+	switch (type) {
+
+	case RINGBUF_TYPE_PADDING:
+		break;
+
+	case RINGBUF_TYPE_TIME_EXTEND:
+		event->len =
+			(RB_LEN_TIME_EXTEND + (RB_ALIGNMENT-1))
+			>> RB_ALIGNMENT_SHIFT;
+		break;
+
+	case RINGBUF_TYPE_TIME_STAMP:
+		event->len =
+			(RB_LEN_TIME_STAMP + (RB_ALIGNMENT-1))
+			>> RB_ALIGNMENT_SHIFT;
+		break;
+
+	case RINGBUF_TYPE_DATA:
+		length -= RB_EVNT_HDR_SIZE;
+		if (length > RB_MAX_SMALL_DATA) {
+			event->len = 0;
+			event->array[0] = length;
+		} else
+			event->len =
+				(length + (RB_ALIGNMENT-1))
+				>> RB_ALIGNMENT_SHIFT;
+		break;
+	default:
+		BUG();
+	}
+}
+
+static inline unsigned rb_calculate_event_length(unsigned length)
+{
+	struct ring_buffer_event event; /* Used only for sizeof array */
+
+	/* zero length can cause confusions */
+	if (!length)
+		length = 1;
+
+	if (length > RB_MAX_SMALL_DATA)
+		length += sizeof(event.array[0]);
+
+	length += RB_EVNT_HDR_SIZE;
+	length = ALIGN(length, RB_ALIGNMENT);
+
+	return length;
+}
+
+static struct ring_buffer_event *
+__rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
+		  unsigned type, unsigned long length, u64 *ts)
+{
+	struct buffer_page *tail_page, *head_page, *reader_page, *commit_page;
+	unsigned long tail, write;
+	struct ring_buffer *buffer = cpu_buffer->buffer;
+	struct ring_buffer_event *event;
+	unsigned long flags;
+
+	commit_page = cpu_buffer->commit_page;
+	/* we just need to protect against interrupts */
+	barrier();
+	tail_page = cpu_buffer->tail_page;
+	write = local_add_return(length, &tail_page->write);
+	tail = write - length;
+
+	/* See if we shot pass the end of this buffer page */
+	if (write > BUF_PAGE_SIZE) {
+		struct buffer_page *next_page = tail_page;
+
+		local_irq_save(flags);
+		__raw_spin_lock(&cpu_buffer->lock);
+
+		rb_inc_page(cpu_buffer, &next_page);
+
+		head_page = cpu_buffer->head_page;
+		reader_page = cpu_buffer->reader_page;
+
+		/* we grabbed the lock before incrementing */
+		if (RB_WARN_ON(cpu_buffer, next_page == reader_page))
+			goto out_unlock;
+
+		/*
+		 * If for some reason, we had an interrupt storm that made
+		 * it all the way around the buffer, bail, and warn
+		 * about it.
+		 */
+		if (unlikely(next_page == commit_page)) {
+			WARN_ON_ONCE(1);
+			goto out_unlock;
+		}
+
+		if (next_page == head_page) {
+			if (!(buffer->flags & RB_FL_OVERWRITE)) {
+				/* reset write */
+				if (tail <= BUF_PAGE_SIZE)
+					local_set(&tail_page->write, tail);
+				goto out_unlock;
+			}
+
+			/* tail_page has not moved yet? */
+			if (tail_page == cpu_buffer->tail_page) {
+				/* count overflows */
+				rb_update_overflow(cpu_buffer);
+
+				rb_inc_page(cpu_buffer, &head_page);
+				cpu_buffer->head_page = head_page;
+				cpu_buffer->head_page->read = 0;
+			}
+		}
+
+		/*
+		 * If the tail page is still the same as what we think
+		 * it is, then it is up to us to update the tail
+		 * pointer.
+		 */
+		if (tail_page == cpu_buffer->tail_page) {
+			local_set(&next_page->write, 0);
+			local_set(&next_page->page->commit, 0);
+			cpu_buffer->tail_page = next_page;
+
+			/* reread the time stamp */
+			*ts = ring_buffer_time_stamp(cpu_buffer->cpu);
+			cpu_buffer->tail_page->page->time_stamp = *ts;
+		}
+
+		/*
+		 * The actual tail page has moved forward.
+		 */
+		if (tail < BUF_PAGE_SIZE) {
+			/* Mark the rest of the page with padding */
+			event = __rb_page_index(tail_page, tail);
+			event->type = RINGBUF_TYPE_PADDING;
+		}
+
+		if (tail <= BUF_PAGE_SIZE)
+			/* Set the write back to the previous setting */
+			local_set(&tail_page->write, tail);
+
+		/*
+		 * If this was a commit entry that failed,
+		 * increment that too
+		 */
+		if (tail_page == cpu_buffer->commit_page &&
+		    tail == rb_commit_index(cpu_buffer)) {
+			rb_set_commit_to_write(cpu_buffer);
+		}
+
+		__raw_spin_unlock(&cpu_buffer->lock);
+		local_irq_restore(flags);
+
+		/* fail and let the caller try again */
+		return ERR_PTR(-EAGAIN);
+	}
+
+	/* We reserved something on the buffer */
+
+	if (RB_WARN_ON(cpu_buffer, write > BUF_PAGE_SIZE))
+		return NULL;
+
+	event = __rb_page_index(tail_page, tail);
+	rb_update_event(event, type, length);
+
+	/*
+	 * If this is a commit and the tail is zero, then update
+	 * this page's time stamp.
+	 */
+	if (!tail && rb_is_commit(cpu_buffer, event))
+		cpu_buffer->commit_page->page->time_stamp = *ts;
+
+	return event;
+
+ out_unlock:
+	__raw_spin_unlock(&cpu_buffer->lock);
+	local_irq_restore(flags);
+	return NULL;
+}
+
+static int
+rb_add_time_stamp(struct ring_buffer_per_cpu *cpu_buffer,
+		  u64 *ts, u64 *delta)
+{
+	struct ring_buffer_event *event;
+	static int once;
+	int ret;
+
+	if (unlikely(*delta > (1ULL << 59) && !once++)) {
+		printk(KERN_WARNING "Delta way too big! %llu"
+		       " ts=%llu write stamp = %llu\n",
+		       (unsigned long long)*delta,
+		       (unsigned long long)*ts,
+		       (unsigned long long)cpu_buffer->write_stamp);
+		WARN_ON(1);
+	}
+
+	/*
+	 * The delta is too big, we to add a
+	 * new timestamp.
+	 */
+	event = __rb_reserve_next(cpu_buffer,
+				  RINGBUF_TYPE_TIME_EXTEND,
+				  RB_LEN_TIME_EXTEND,
+				  ts);
+	if (!event)
+		return -EBUSY;
+
+	if (PTR_ERR(event) == -EAGAIN)
+		return -EAGAIN;
+
+	/* Only a commited time event can update the write stamp */
+	if (rb_is_commit(cpu_buffer, event)) {
+		/*
+		 * If this is the first on the page, then we need to
+		 * update the page itself, and just put in a zero.
+		 */
+		if (rb_event_index(event)) {
+			event->time_delta = *delta & TS_MASK;
+			event->array[0] = *delta >> TS_SHIFT;
+		} else {
+			cpu_buffer->commit_page->page->time_stamp = *ts;
+			event->time_delta = 0;
+			event->array[0] = 0;
+		}
+		cpu_buffer->write_stamp = *ts;
+		/* let the caller know this was the commit */
+		ret = 1;
+	} else {
+		/* Darn, this is just wasted space */
+		event->time_delta = 0;
+		event->array[0] = 0;
+		ret = 0;
+	}
+
+	*delta = 0;
+
+	return ret;
+}
+
+static struct ring_buffer_event *
+rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
+		      unsigned type, unsigned long length)
+{
+	struct ring_buffer_event *event;
+	u64 ts, delta;
+	int commit = 0;
+	int nr_loops = 0;
+
+ again:
+	/*
+	 * We allow for interrupts to reenter here and do a trace.
+	 * If one does, it will cause this original code to loop
+	 * back here. Even with heavy interrupts happening, this
+	 * should only happen a few times in a row. If this happens
+	 * 1000 times in a row, there must be either an interrupt
+	 * storm or we have something buggy.
+	 * Bail!
+	 */
+	if (RB_WARN_ON(cpu_buffer, ++nr_loops > 1000))
+		return NULL;
+
+	ts = ring_buffer_time_stamp(cpu_buffer->cpu);
+
+	/*
+	 * Only the first commit can update the timestamp.
+	 * Yes there is a race here. If an interrupt comes in
+	 * just after the conditional and it traces too, then it
+	 * will also check the deltas. More than one timestamp may
+	 * also be made. But only the entry that did the actual
+	 * commit will be something other than zero.
+	 */
+	if (cpu_buffer->tail_page == cpu_buffer->commit_page &&
+	    rb_page_write(cpu_buffer->tail_page) ==
+	    rb_commit_index(cpu_buffer)) {
+
+		delta = ts - cpu_buffer->write_stamp;
+
+		/* make sure this delta is calculated here */
+		barrier();
+
+		/* Did the write stamp get updated already? */
+		if (unlikely(ts < cpu_buffer->write_stamp))
+			delta = 0;
+
+		if (test_time_stamp(delta)) {
+
+			commit = rb_add_time_stamp(cpu_buffer, &ts, &delta);
+
+			if (commit == -EBUSY)
+				return NULL;
+
+			if (commit == -EAGAIN)
+				goto again;
+
+			RB_WARN_ON(cpu_buffer, commit < 0);
+		}
+	} else
+		/* Non commits have zero deltas */
+		delta = 0;
+
+	event = __rb_reserve_next(cpu_buffer, type, length, &ts);
+	if (PTR_ERR(event) == -EAGAIN)
+		goto again;
+
+	if (!event) {
+		if (unlikely(commit))
+			/*
+			 * Ouch! We needed a timestamp and it was commited. But
+			 * we didn't get our event reserved.
+			 */
+			rb_set_commit_to_write(cpu_buffer);
+		return NULL;
+	}
+
+	/*
+	 * If the timestamp was commited, make the commit our entry
+	 * now so that we will update it when needed.
+	 */
+	if (commit)
+		rb_set_commit_event(cpu_buffer, event);
+	else if (!rb_is_commit(cpu_buffer, event))
+		delta = 0;
+
+	event->time_delta = delta;
+
+	return event;
+}
+
+static DEFINE_PER_CPU(int, rb_need_resched);
+
+/**
+ * ring_buffer_lock_reserve - reserve a part of the buffer
+ * @buffer: the ring buffer to reserve from
+ * @length: the length of the data to reserve (excluding event header)
+ * @flags: a pointer to save the interrupt flags
+ *
+ * Returns a reseverd event on the ring buffer to copy directly to.
+ * The user of this interface will need to get the body to write into
+ * and can use the ring_buffer_event_data() interface.
+ *
+ * The length is the length of the data needed, not the event length
+ * which also includes the event header.
+ *
+ * Must be paired with ring_buffer_unlock_commit, unless NULL is returned.
+ * If NULL is returned, then nothing has been allocated or locked.
+ */
+struct ring_buffer_event *
+ring_buffer_lock_reserve(struct ring_buffer *buffer,
+			 unsigned long length,
+			 unsigned long *flags)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+	struct ring_buffer_event *event;
+	int cpu, resched;
+
+	if (ring_buffer_flags != RB_BUFFERS_ON)
+		return NULL;
+
+	if (atomic_read(&buffer->record_disabled))
+		return NULL;
+
+	/* If we are tracing schedule, we don't want to recurse */
+	resched = ftrace_preempt_disable();
+
+	cpu = raw_smp_processor_id();
+
+	if (!cpu_isset(cpu, buffer->cpumask))
+		goto out;
+
+	cpu_buffer = buffer->buffers[cpu];
+
+	if (atomic_read(&cpu_buffer->record_disabled))
+		goto out;
+
+	length = rb_calculate_event_length(length);
+	if (length > BUF_PAGE_SIZE)
+		goto out;
+
+	event = rb_reserve_next_event(cpu_buffer, RINGBUF_TYPE_DATA, length);
+	if (!event)
+		goto out;
+
+	/*
+	 * Need to store resched state on this cpu.
+	 * Only the first needs to.
+	 */
+
+	if (preempt_count() == 1)
+		per_cpu(rb_need_resched, cpu) = resched;
+
+	return event;
+
+ out:
+	ftrace_preempt_enable(resched);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_lock_reserve);
+
+static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer,
+		      struct ring_buffer_event *event)
+{
+	cpu_buffer->entries++;
+
+	/* Only process further if we own the commit */
+	if (!rb_is_commit(cpu_buffer, event))
+		return;
+
+	cpu_buffer->write_stamp += event->time_delta;
+
+	rb_set_commit_to_write(cpu_buffer);
+}
+
+/**
+ * ring_buffer_unlock_commit - commit a reserved
+ * @buffer: The buffer to commit to
+ * @event: The event pointer to commit.
+ * @flags: the interrupt flags received from ring_buffer_lock_reserve.
+ *
+ * This commits the data to the ring buffer, and releases any locks held.
+ *
+ * Must be paired with ring_buffer_lock_reserve.
+ */
+int ring_buffer_unlock_commit(struct ring_buffer *buffer,
+			      struct ring_buffer_event *event,
+			      unsigned long flags)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+	int cpu = raw_smp_processor_id();
+
+	cpu_buffer = buffer->buffers[cpu];
+
+	rb_commit(cpu_buffer, event);
+
+	/*
+	 * Only the last preempt count needs to restore preemption.
+	 */
+	if (preempt_count() == 1)
+		ftrace_preempt_enable(per_cpu(rb_need_resched, cpu));
+	else
+		preempt_enable_no_resched_notrace();
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_unlock_commit);
+
+/**
+ * ring_buffer_write - write data to the buffer without reserving
+ * @buffer: The ring buffer to write to.
+ * @length: The length of the data being written (excluding the event header)
+ * @data: The data to write to the buffer.
+ *
+ * This is like ring_buffer_lock_reserve and ring_buffer_unlock_commit as
+ * one function. If you already have the data to write to the buffer, it
+ * may be easier to simply call this function.
+ *
+ * Note, like ring_buffer_lock_reserve, the length is the length of the data
+ * and not the length of the event which would hold the header.
+ */
+int ring_buffer_write(struct ring_buffer *buffer,
+			unsigned long length,
+			void *data)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+	struct ring_buffer_event *event;
+	unsigned long event_length;
+	void *body;
+	int ret = -EBUSY;
+	int cpu, resched;
+
+	if (ring_buffer_flags != RB_BUFFERS_ON)
+		return -EBUSY;
+
+	if (atomic_read(&buffer->record_disabled))
+		return -EBUSY;
+
+	resched = ftrace_preempt_disable();
+
+	cpu = raw_smp_processor_id();
+
+	if (!cpu_isset(cpu, buffer->cpumask))
+		goto out;
+
+	cpu_buffer = buffer->buffers[cpu];
+
+	if (atomic_read(&cpu_buffer->record_disabled))
+		goto out;
+
+	event_length = rb_calculate_event_length(length);
+	event = rb_reserve_next_event(cpu_buffer,
+				      RINGBUF_TYPE_DATA, event_length);
+	if (!event)
+		goto out;
+
+	body = rb_event_data(event);
+
+	memcpy(body, data, length);
+
+	rb_commit(cpu_buffer, event);
+
+	ret = 0;
+ out:
+	ftrace_preempt_enable(resched);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_write);
+
+static inline int rb_per_cpu_empty(struct ring_buffer_per_cpu *cpu_buffer)
+{
+	struct buffer_page *reader = cpu_buffer->reader_page;
+	struct buffer_page *head = cpu_buffer->head_page;
+	struct buffer_page *commit = cpu_buffer->commit_page;
+
+	return reader->read == rb_page_commit(reader) &&
+		(commit == reader ||
+		 (commit == head &&
+		  head->read == rb_page_commit(commit)));
+}
+
+/**
+ * ring_buffer_record_disable - stop all writes into the buffer
+ * @buffer: The ring buffer to stop writes to.
+ *
+ * This prevents all writes to the buffer. Any attempt to write
+ * to the buffer after this will fail and return NULL.
+ *
+ * The caller should call synchronize_sched() after this.
+ */
+void ring_buffer_record_disable(struct ring_buffer *buffer)
+{
+	atomic_inc(&buffer->record_disabled);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_record_disable);
+
+/**
+ * ring_buffer_record_enable - enable writes to the buffer
+ * @buffer: The ring buffer to enable writes
+ *
+ * Note, multiple disables will need the same number of enables
+ * to truely enable the writing (much like preempt_disable).
+ */
+void ring_buffer_record_enable(struct ring_buffer *buffer)
+{
+	atomic_dec(&buffer->record_disabled);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_record_enable);
+
+/**
+ * ring_buffer_record_disable_cpu - stop all writes into the cpu_buffer
+ * @buffer: The ring buffer to stop writes to.
+ * @cpu: The CPU buffer to stop
+ *
+ * This prevents all writes to the buffer. Any attempt to write
+ * to the buffer after this will fail and return NULL.
+ *
+ * The caller should call synchronize_sched() after this.
+ */
+void ring_buffer_record_disable_cpu(struct ring_buffer *buffer, int cpu)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+
+	if (!cpu_isset(cpu, buffer->cpumask))
+		return;
+
+	cpu_buffer = buffer->buffers[cpu];
+	atomic_inc(&cpu_buffer->record_disabled);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_record_disable_cpu);
+
+/**
+ * ring_buffer_record_enable_cpu - enable writes to the buffer
+ * @buffer: The ring buffer to enable writes
+ * @cpu: The CPU to enable.
+ *
+ * Note, multiple disables will need the same number of enables
+ * to truely enable the writing (much like preempt_disable).
+ */
+void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+
+	if (!cpu_isset(cpu, buffer->cpumask))
+		return;
+
+	cpu_buffer = buffer->buffers[cpu];
+	atomic_dec(&cpu_buffer->record_disabled);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_record_enable_cpu);
+
+/**
+ * ring_buffer_entries_cpu - get the number of entries in a cpu buffer
+ * @buffer: The ring buffer
+ * @cpu: The per CPU buffer to get the entries from.
+ */
+unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+
+	if (!cpu_isset(cpu, buffer->cpumask))
+		return 0;
+
+	cpu_buffer = buffer->buffers[cpu];
+	return cpu_buffer->entries;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_entries_cpu);
+
+/**
+ * ring_buffer_overrun_cpu - get the number of overruns in a cpu_buffer
+ * @buffer: The ring buffer
+ * @cpu: The per CPU buffer to get the number of overruns from
+ */
+unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+
+	if (!cpu_isset(cpu, buffer->cpumask))
+		return 0;
+
+	cpu_buffer = buffer->buffers[cpu];
+	return cpu_buffer->overrun;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_overrun_cpu);
+
+/**
+ * ring_buffer_entries - get the number of entries in a buffer
+ * @buffer: The ring buffer
+ *
+ * Returns the total number of entries in the ring buffer
+ * (all CPU entries)
+ */
+unsigned long ring_buffer_entries(struct ring_buffer *buffer)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+	unsigned long entries = 0;
+	int cpu;
+
+	/* if you care about this being correct, lock the buffer */
+	for_each_buffer_cpu(buffer, cpu) {
+		cpu_buffer = buffer->buffers[cpu];
+		entries += cpu_buffer->entries;
+	}
+
+	return entries;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_entries);
+
+/**
+ * ring_buffer_overrun_cpu - get the number of overruns in buffer
+ * @buffer: The ring buffer
+ *
+ * Returns the total number of overruns in the ring buffer
+ * (all CPU entries)
+ */
+unsigned long ring_buffer_overruns(struct ring_buffer *buffer)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+	unsigned long overruns = 0;
+	int cpu;
+
+	/* if you care about this being correct, lock the buffer */
+	for_each_buffer_cpu(buffer, cpu) {
+		cpu_buffer = buffer->buffers[cpu];
+		overruns += cpu_buffer->overrun;
+	}
+
+	return overruns;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_overruns);
+
+static void rb_iter_reset(struct ring_buffer_iter *iter)
+{
+	struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+
+	/* Iterator usage is expected to have record disabled */
+	if (list_empty(&cpu_buffer->reader_page->list)) {
+		iter->head_page = cpu_buffer->head_page;
+		iter->head = cpu_buffer->head_page->read;
+	} else {
+		iter->head_page = cpu_buffer->reader_page;
+		iter->head = cpu_buffer->reader_page->read;
+	}
+	if (iter->head)
+		iter->read_stamp = cpu_buffer->read_stamp;
+	else
+		iter->read_stamp = iter->head_page->page->time_stamp;
+}
+
+/**
+ * ring_buffer_iter_reset - reset an iterator
+ * @iter: The iterator to reset
+ *
+ * Resets the iterator, so that it will start from the beginning
+ * again.
+ */
+void ring_buffer_iter_reset(struct ring_buffer_iter *iter)
+{
+	struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+	unsigned long flags;
+
+	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+	rb_iter_reset(iter);
+	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_iter_reset);
+
+/**
+ * ring_buffer_iter_empty - check if an iterator has no more to read
+ * @iter: The iterator to check
+ */
+int ring_buffer_iter_empty(struct ring_buffer_iter *iter)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+
+	cpu_buffer = iter->cpu_buffer;
+
+	return iter->head_page == cpu_buffer->commit_page &&
+		iter->head == rb_commit_index(cpu_buffer);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_iter_empty);
+
+static void
+rb_update_read_stamp(struct ring_buffer_per_cpu *cpu_buffer,
+		     struct ring_buffer_event *event)
+{
+	u64 delta;
+
+	switch (event->type) {
+	case RINGBUF_TYPE_PADDING:
+		return;
+
+	case RINGBUF_TYPE_TIME_EXTEND:
+		delta = event->array[0];
+		delta <<= TS_SHIFT;
+		delta += event->time_delta;
+		cpu_buffer->read_stamp += delta;
+		return;
+
+	case RINGBUF_TYPE_TIME_STAMP:
+		/* FIXME: not implemented */
+		return;
+
+	case RINGBUF_TYPE_DATA:
+		cpu_buffer->read_stamp += event->time_delta;
+		return;
+
+	default:
+		BUG();
+	}
+	return;
+}
+
+static void
+rb_update_iter_read_stamp(struct ring_buffer_iter *iter,
+			  struct ring_buffer_event *event)
+{
+	u64 delta;
+
+	switch (event->type) {
+	case RINGBUF_TYPE_PADDING:
+		return;
+
+	case RINGBUF_TYPE_TIME_EXTEND:
+		delta = event->array[0];
+		delta <<= TS_SHIFT;
+		delta += event->time_delta;
+		iter->read_stamp += delta;
+		return;
+
+	case RINGBUF_TYPE_TIME_STAMP:
+		/* FIXME: not implemented */
+		return;
+
+	case RINGBUF_TYPE_DATA:
+		iter->read_stamp += event->time_delta;
+		return;
+
+	default:
+		BUG();
+	}
+	return;
+}
+
+static struct buffer_page *
+rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
+{
+	struct buffer_page *reader = NULL;
+	unsigned long flags;
+	int nr_loops = 0;
+
+	local_irq_save(flags);
+	__raw_spin_lock(&cpu_buffer->lock);
+
+ again:
+	/*
+	 * This should normally only loop twice. But because the
+	 * start of the reader inserts an empty page, it causes
+	 * a case where we will loop three times. There should be no
+	 * reason to loop four times (that I know of).
+	 */
+	if (RB_WARN_ON(cpu_buffer, ++nr_loops > 3)) {
+		reader = NULL;
+		goto out;
+	}
+
+	reader = cpu_buffer->reader_page;
+
+	/* If there's more to read, return this page */
+	if (cpu_buffer->reader_page->read < rb_page_size(reader))
+		goto out;
+
+	/* Never should we have an index greater than the size */
+	if (RB_WARN_ON(cpu_buffer,
+		       cpu_buffer->reader_page->read > rb_page_size(reader)))
+		goto out;
+
+	/* check if we caught up to the tail */
+	reader = NULL;
+	if (cpu_buffer->commit_page == cpu_buffer->reader_page)
+		goto out;
+
+	/*
+	 * Splice the empty reader page into the list around the head.
+	 * Reset the reader page to size zero.
+	 */
+
+	reader = cpu_buffer->head_page;
+	cpu_buffer->reader_page->list.next = reader->list.next;
+	cpu_buffer->reader_page->list.prev = reader->list.prev;
+
+	local_set(&cpu_buffer->reader_page->write, 0);
+	local_set(&cpu_buffer->reader_page->page->commit, 0);
+
+	/* Make the reader page now replace the head */
+	reader->list.prev->next = &cpu_buffer->reader_page->list;
+	reader->list.next->prev = &cpu_buffer->reader_page->list;
+
+	/*
+	 * If the tail is on the reader, then we must set the head
+	 * to the inserted page, otherwise we set it one before.
+	 */
+	cpu_buffer->head_page = cpu_buffer->reader_page;
+
+	if (cpu_buffer->commit_page != reader)
+		rb_inc_page(cpu_buffer, &cpu_buffer->head_page);
+
+	/* Finally update the reader page to the new head */
+	cpu_buffer->reader_page = reader;
+	rb_reset_reader_page(cpu_buffer);
+
+	goto again;
+
+ out:
+	__raw_spin_unlock(&cpu_buffer->lock);
+	local_irq_restore(flags);
+
+	return reader;
+}
+
+static void rb_advance_reader(struct ring_buffer_per_cpu *cpu_buffer)
+{
+	struct ring_buffer_event *event;
+	struct buffer_page *reader;
+	unsigned length;
+
+	reader = rb_get_reader_page(cpu_buffer);
+
+	/* This function should not be called when buffer is empty */
+	if (RB_WARN_ON(cpu_buffer, !reader))
+		return;
+
+	event = rb_reader_event(cpu_buffer);
+
+	if (event->type == RINGBUF_TYPE_DATA)
+		cpu_buffer->entries--;
+
+	rb_update_read_stamp(cpu_buffer, event);
+
+	length = rb_event_length(event);
+	cpu_buffer->reader_page->read += length;
+}
+
+static void rb_advance_iter(struct ring_buffer_iter *iter)
+{
+	struct ring_buffer *buffer;
+	struct ring_buffer_per_cpu *cpu_buffer;
+	struct ring_buffer_event *event;
+	unsigned length;
+
+	cpu_buffer = iter->cpu_buffer;
+	buffer = cpu_buffer->buffer;
+
+	/*
+	 * Check if we are at the end of the buffer.
+	 */
+	if (iter->head >= rb_page_size(iter->head_page)) {
+		if (RB_WARN_ON(buffer,
+			       iter->head_page == cpu_buffer->commit_page))
+			return;
+		rb_inc_iter(iter);
+		return;
+	}
+
+	event = rb_iter_head_event(iter);
+
+	length = rb_event_length(event);
+
+	/*
+	 * This should not be called to advance the header if we are
+	 * at the tail of the buffer.
+	 */
+	if (RB_WARN_ON(cpu_buffer,
+		       (iter->head_page == cpu_buffer->commit_page) &&
+		       (iter->head + length > rb_commit_index(cpu_buffer))))
+		return;
+
+	rb_update_iter_read_stamp(iter, event);
+
+	iter->head += length;
+
+	/* check for end of page padding */
+	if ((iter->head >= rb_page_size(iter->head_page)) &&
+	    (iter->head_page != cpu_buffer->commit_page))
+		rb_advance_iter(iter);
+}
+
+static struct ring_buffer_event *
+rb_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+	struct ring_buffer_event *event;
+	struct buffer_page *reader;
+	int nr_loops = 0;
+
+	if (!cpu_isset(cpu, buffer->cpumask))
+		return NULL;
+
+	cpu_buffer = buffer->buffers[cpu];
+
+ again:
+	/*
+	 * We repeat when a timestamp is encountered. It is possible
+	 * to get multiple timestamps from an interrupt entering just
+	 * as one timestamp is about to be written. The max times
+	 * that this can happen is the number of nested interrupts we
+	 * can have.  Nesting 10 deep of interrupts is clearly
+	 * an anomaly.
+	 */
+	if (RB_WARN_ON(cpu_buffer, ++nr_loops > 10))
+		return NULL;
+
+	reader = rb_get_reader_page(cpu_buffer);
+	if (!reader)
+		return NULL;
+
+	event = rb_reader_event(cpu_buffer);
+
+	switch (event->type) {
+	case RINGBUF_TYPE_PADDING:
+		RB_WARN_ON(cpu_buffer, 1);
+		rb_advance_reader(cpu_buffer);
+		return NULL;
+
+	case RINGBUF_TYPE_TIME_EXTEND:
+		/* Internal data, OK to advance */
+		rb_advance_reader(cpu_buffer);
+		goto again;
+
+	case RINGBUF_TYPE_TIME_STAMP:
+		/* FIXME: not implemented */
+		rb_advance_reader(cpu_buffer);
+		goto again;
+
+	case RINGBUF_TYPE_DATA:
+		if (ts) {
+			*ts = cpu_buffer->read_stamp + event->time_delta;
+			ring_buffer_normalize_time_stamp(cpu_buffer->cpu, ts);
+		}
+		return event;
+
+	default:
+		BUG();
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_peek);
+
+static struct ring_buffer_event *
+rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
+{
+	struct ring_buffer *buffer;
+	struct ring_buffer_per_cpu *cpu_buffer;
+	struct ring_buffer_event *event;
+	int nr_loops = 0;
+
+	if (ring_buffer_iter_empty(iter))
+		return NULL;
+
+	cpu_buffer = iter->cpu_buffer;
+	buffer = cpu_buffer->buffer;
+
+ again:
+	/*
+	 * We repeat when a timestamp is encountered. It is possible
+	 * to get multiple timestamps from an interrupt entering just
+	 * as one timestamp is about to be written. The max times
+	 * that this can happen is the number of nested interrupts we
+	 * can have. Nesting 10 deep of interrupts is clearly
+	 * an anomaly.
+	 */
+	if (RB_WARN_ON(cpu_buffer, ++nr_loops > 10))
+		return NULL;
+
+	if (rb_per_cpu_empty(cpu_buffer))
+		return NULL;
+
+	event = rb_iter_head_event(iter);
+
+	switch (event->type) {
+	case RINGBUF_TYPE_PADDING:
+		rb_inc_iter(iter);
+		goto again;
+
+	case RINGBUF_TYPE_TIME_EXTEND:
+		/* Internal data, OK to advance */
+		rb_advance_iter(iter);
+		goto again;
+
+	case RINGBUF_TYPE_TIME_STAMP:
+		/* FIXME: not implemented */
+		rb_advance_iter(iter);
+		goto again;
+
+	case RINGBUF_TYPE_DATA:
+		if (ts) {
+			*ts = iter->read_stamp + event->time_delta;
+			ring_buffer_normalize_time_stamp(cpu_buffer->cpu, ts);
+		}
+		return event;
+
+	default:
+		BUG();
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_iter_peek);
+
+/**
+ * ring_buffer_peek - peek at the next event to be read
+ * @buffer: The ring buffer to read
+ * @cpu: The cpu to peak at
+ * @ts: The timestamp counter of this event.
+ *
+ * This will return the event that will be read next, but does
+ * not consume the data.
+ */
+struct ring_buffer_event *
+ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
+{
+	struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
+	struct ring_buffer_event *event;
+	unsigned long flags;
+
+	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+	event = rb_buffer_peek(buffer, cpu, ts);
+	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+
+	return event;
+}
+
+/**
+ * ring_buffer_iter_peek - peek at the next event to be read
+ * @iter: The ring buffer iterator
+ * @ts: The timestamp counter of this event.
+ *
+ * This will return the event that will be read next, but does
+ * not increment the iterator.
+ */
+struct ring_buffer_event *
+ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
+{
+	struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+	struct ring_buffer_event *event;
+	unsigned long flags;
+
+	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+	event = rb_iter_peek(iter, ts);
+	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+
+	return event;
+}
+
+/**
+ * ring_buffer_consume - return an event and consume it
+ * @buffer: The ring buffer to get the next event from
+ *
+ * Returns the next event in the ring buffer, and that event is consumed.
+ * Meaning, that sequential reads will keep returning a different event,
+ * and eventually empty the ring buffer if the producer is slower.
+ */
+struct ring_buffer_event *
+ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)
+{
+	struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
+	struct ring_buffer_event *event;
+	unsigned long flags;
+
+	if (!cpu_isset(cpu, buffer->cpumask))
+		return NULL;
+
+	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+
+	event = rb_buffer_peek(buffer, cpu, ts);
+	if (!event)
+		goto out;
+
+	rb_advance_reader(cpu_buffer);
+
+ out:
+	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+
+	return event;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_consume);
+
+/**
+ * ring_buffer_read_start - start a non consuming read of the buffer
+ * @buffer: The ring buffer to read from
+ * @cpu: The cpu buffer to iterate over
+ *
+ * This starts up an iteration through the buffer. It also disables
+ * the recording to the buffer until the reading is finished.
+ * This prevents the reading from being corrupted. This is not
+ * a consuming read, so a producer is not expected.
+ *
+ * Must be paired with ring_buffer_finish.
+ */
+struct ring_buffer_iter *
+ring_buffer_read_start(struct ring_buffer *buffer, int cpu)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+	struct ring_buffer_iter *iter;
+	unsigned long flags;
+
+	if (!cpu_isset(cpu, buffer->cpumask))
+		return NULL;
+
+	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+	if (!iter)
+		return NULL;
+
+	cpu_buffer = buffer->buffers[cpu];
+
+	iter->cpu_buffer = cpu_buffer;
+
+	atomic_inc(&cpu_buffer->record_disabled);
+	synchronize_sched();
+
+	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+	__raw_spin_lock(&cpu_buffer->lock);
+	rb_iter_reset(iter);
+	__raw_spin_unlock(&cpu_buffer->lock);
+	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+
+	return iter;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_read_start);
+
+/**
+ * ring_buffer_finish - finish reading the iterator of the buffer
+ * @iter: The iterator retrieved by ring_buffer_start
+ *
+ * This re-enables the recording to the buffer, and frees the
+ * iterator.
+ */
+void
+ring_buffer_read_finish(struct ring_buffer_iter *iter)
+{
+	struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+
+	atomic_dec(&cpu_buffer->record_disabled);
+	kfree(iter);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_read_finish);
+
+/**
+ * ring_buffer_read - read the next item in the ring buffer by the iterator
+ * @iter: The ring buffer iterator
+ * @ts: The time stamp of the event read.
+ *
+ * This reads the next event in the ring buffer and increments the iterator.
+ */
+struct ring_buffer_event *
+ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts)
+{
+	struct ring_buffer_event *event;
+	struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+	unsigned long flags;
+
+	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+	event = rb_iter_peek(iter, ts);
+	if (!event)
+		goto out;
+
+	rb_advance_iter(iter);
+ out:
+	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+
+	return event;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_read);
+
+/**
+ * ring_buffer_size - return the size of the ring buffer (in bytes)
+ * @buffer: The ring buffer.
+ */
+unsigned long ring_buffer_size(struct ring_buffer *buffer)
+{
+	return BUF_PAGE_SIZE * buffer->pages;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_size);
+
+static void
+rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
+{
+	cpu_buffer->head_page
+		= list_entry(cpu_buffer->pages.next, struct buffer_page, list);
+	local_set(&cpu_buffer->head_page->write, 0);
+	local_set(&cpu_buffer->head_page->page->commit, 0);
+
+	cpu_buffer->head_page->read = 0;
+
+	cpu_buffer->tail_page = cpu_buffer->head_page;
+	cpu_buffer->commit_page = cpu_buffer->head_page;
+
+	INIT_LIST_HEAD(&cpu_buffer->reader_page->list);
+	local_set(&cpu_buffer->reader_page->write, 0);
+	local_set(&cpu_buffer->reader_page->page->commit, 0);
+	cpu_buffer->reader_page->read = 0;
+
+	cpu_buffer->overrun = 0;
+	cpu_buffer->entries = 0;
+}
+
+/**
+ * ring_buffer_reset_cpu - reset a ring buffer per CPU buffer
+ * @buffer: The ring buffer to reset a per cpu buffer of
+ * @cpu: The CPU buffer to be reset
+ */
+void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
+{
+	struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
+	unsigned long flags;
+
+	if (!cpu_isset(cpu, buffer->cpumask))
+		return;
+
+	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+
+	__raw_spin_lock(&cpu_buffer->lock);
+
+	rb_reset_cpu(cpu_buffer);
+
+	__raw_spin_unlock(&cpu_buffer->lock);
+
+	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);
+
+/**
+ * ring_buffer_reset - reset a ring buffer
+ * @buffer: The ring buffer to reset all cpu buffers
+ */
+void ring_buffer_reset(struct ring_buffer *buffer)
+{
+	int cpu;
+
+	for_each_buffer_cpu(buffer, cpu)
+		ring_buffer_reset_cpu(buffer, cpu);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_reset);
+
+/**
+ * rind_buffer_empty - is the ring buffer empty?
+ * @buffer: The ring buffer to test
+ */
+int ring_buffer_empty(struct ring_buffer *buffer)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+	int cpu;
+
+	/* yes this is racy, but if you don't like the race, lock the buffer */
+	for_each_buffer_cpu(buffer, cpu) {
+		cpu_buffer = buffer->buffers[cpu];
+		if (!rb_per_cpu_empty(cpu_buffer))
+			return 0;
+	}
+	return 1;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_empty);
+
+/**
+ * ring_buffer_empty_cpu - is a cpu buffer of a ring buffer empty?
+ * @buffer: The ring buffer
+ * @cpu: The CPU buffer to test
+ */
+int ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu)
+{
+	struct ring_buffer_per_cpu *cpu_buffer;
+
+	if (!cpu_isset(cpu, buffer->cpumask))
+		return 1;
+
+	cpu_buffer = buffer->buffers[cpu];
+	return rb_per_cpu_empty(cpu_buffer);
+}
+EXPORT_SYMBOL_GPL(ring_buffer_empty_cpu);
+
+/**
+ * ring_buffer_swap_cpu - swap a CPU buffer between two ring buffers
+ * @buffer_a: One buffer to swap with
+ * @buffer_b: The other buffer to swap with
+ *
+ * This function is useful for tracers that want to take a "snapshot"
+ * of a CPU buffer and has another back up buffer lying around.
+ * it is expected that the tracer handles the cpu buffer not being
+ * used at the moment.
+ */
+int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
+			 struct ring_buffer *buffer_b, int cpu)
+{
+	struct ring_buffer_per_cpu *cpu_buffer_a;
+	struct ring_buffer_per_cpu *cpu_buffer_b;
+
+	if (!cpu_isset(cpu, buffer_a->cpumask) ||
+	    !cpu_isset(cpu, buffer_b->cpumask))
+		return -EINVAL;
+
+	/* At least make sure the two buffers are somewhat the same */
+	if (buffer_a->pages != buffer_b->pages)
+		return -EINVAL;
+
+	cpu_buffer_a = buffer_a->buffers[cpu];
+	cpu_buffer_b = buffer_b->buffers[cpu];
+
+	/*
+	 * We can't do a synchronize_sched here because this
+	 * function can be called in atomic context.
+	 * Normally this will be called from the same CPU as cpu.
+	 * If not it's up to the caller to protect this.
+	 */
+	atomic_inc(&cpu_buffer_a->record_disabled);
+	atomic_inc(&cpu_buffer_b->record_disabled);
+
+	buffer_a->buffers[cpu] = cpu_buffer_b;
+	buffer_b->buffers[cpu] = cpu_buffer_a;
+
+	cpu_buffer_b->buffer = buffer_a;
+	cpu_buffer_a->buffer = buffer_b;
+
+	atomic_dec(&cpu_buffer_a->record_disabled);
+	atomic_dec(&cpu_buffer_b->record_disabled);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ring_buffer_swap_cpu);
+
+static void rb_remove_entries(struct ring_buffer_per_cpu *cpu_buffer,
+			      struct buffer_data_page *bpage)
+{
+	struct ring_buffer_event *event;
+	unsigned long head;
+
+	__raw_spin_lock(&cpu_buffer->lock);
+	for (head = 0; head < local_read(&bpage->commit);
+	     head += rb_event_length(event)) {
+
+		event = __rb_data_page_index(bpage, head);
+		if (RB_WARN_ON(cpu_buffer, rb_null_event(event)))
+			return;
+		/* Only count data entries */
+		if (event->type != RINGBUF_TYPE_DATA)
+			continue;
+		cpu_buffer->entries--;
+	}
+	__raw_spin_unlock(&cpu_buffer->lock);
+}
+
+/**
+ * ring_buffer_alloc_read_page - allocate a page to read from buffer
+ * @buffer: the buffer to allocate for.
+ *
+ * This function is used in conjunction with ring_buffer_read_page.
+ * When reading a full page from the ring buffer, these functions
+ * can be used to speed up the process. The calling function should
+ * allocate a few pages first with this function. Then when it
+ * needs to get pages from the ring buffer, it passes the result
+ * of this function into ring_buffer_read_page, which will swap
+ * the page that was allocated, with the read page of the buffer.
+ *
+ * Returns:
+ *  The page allocated, or NULL on error.
+ */
+void *ring_buffer_alloc_read_page(struct ring_buffer *buffer)
+{
+	unsigned long addr;
+	struct buffer_data_page *bpage;
+
+	addr = __get_free_page(GFP_KERNEL);
+	if (!addr)
+		return NULL;
+
+	bpage = (void *)addr;
+
+	return bpage;
+}
+
+/**
+ * ring_buffer_free_read_page - free an allocated read page
+ * @buffer: the buffer the page was allocate for
+ * @data: the page to free
+ *
+ * Free a page allocated from ring_buffer_alloc_read_page.
+ */
+void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data)
+{
+	free_page((unsigned long)data);
+}
+
+/**
+ * ring_buffer_read_page - extract a page from the ring buffer
+ * @buffer: buffer to extract from
+ * @data_page: the page to use allocated from ring_buffer_alloc_read_page
+ * @cpu: the cpu of the buffer to extract
+ * @full: should the extraction only happen when the page is full.
+ *
+ * This function will pull out a page from the ring buffer and consume it.
+ * @data_page must be the address of the variable that was returned
+ * from ring_buffer_alloc_read_page. This is because the page might be used
+ * to swap with a page in the ring buffer.
+ *
+ * for example:
+ *	rpage = ring_buffer_alloc_page(buffer);
+ *	if (!rpage)
+ *		return error;
+ *	ret = ring_buffer_read_page(buffer, &rpage, cpu, 0);
+ *	if (ret)
+ *		process_page(rpage);
+ *
+ * When @full is set, the function will not return true unless
+ * the writer is off the reader page.
+ *
+ * Note: it is up to the calling functions to handle sleeps and wakeups.
+ *  The ring buffer can be used anywhere in the kernel and can not
+ *  blindly call wake_up. The layer that uses the ring buffer must be
+ *  responsible for that.
+ *
+ * Returns:
+ *  1 if data has been transferred
+ *  0 if no data has been transferred.
+ */
+int ring_buffer_read_page(struct ring_buffer *buffer,
+			    void **data_page, int cpu, int full)
+{
+	struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
+	struct ring_buffer_event *event;
+	struct buffer_data_page *bpage;
+	unsigned long flags;
+	int ret = 0;
+
+	if (!data_page)
+		return 0;
+
+	bpage = *data_page;
+	if (!bpage)
+		return 0;
+
+	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+
+	/*
+	 * rb_buffer_peek will get the next ring buffer if
+	 * the current reader page is empty.
+	 */
+	event = rb_buffer_peek(buffer, cpu, NULL);
+	if (!event)
+		goto out;
+
+	/* check for data */
+	if (!local_read(&cpu_buffer->reader_page->page->commit))
+		goto out;
+	/*
+	 * If the writer is already off of the read page, then simply
+	 * switch the read page with the given page. Otherwise
+	 * we need to copy the data from the reader to the writer.
+	 */
+	if (cpu_buffer->reader_page == cpu_buffer->commit_page) {
+		unsigned int read = cpu_buffer->reader_page->read;
+
+		if (full)
+			goto out;
+		/* The writer is still on the reader page, we must copy */
+		bpage = cpu_buffer->reader_page->page;
+		memcpy(bpage->data,
+		       cpu_buffer->reader_page->page->data + read,
+		       local_read(&bpage->commit) - read);
+
+		/* consume what was read */
+		cpu_buffer->reader_page += read;
+
+	} else {
+		/* swap the pages */
+		rb_init_page(bpage);
+		bpage = cpu_buffer->reader_page->page;
+		cpu_buffer->reader_page->page = *data_page;
+		cpu_buffer->reader_page->read = 0;
+		*data_page = bpage;
+	}
+	ret = 1;
+
+	/* update the entry counter */
+	rb_remove_entries(cpu_buffer, bpage);
+ out:
+	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+
+	return ret;
+}
+
+static ssize_t
+rb_simple_read(struct file *filp, char __user *ubuf,
+	       size_t cnt, loff_t *ppos)
+{
+	long *p = filp->private_data;
+	char buf[64];
+	int r;
+
+	if (test_bit(RB_BUFFERS_DISABLED_BIT, p))
+		r = sprintf(buf, "permanently disabled\n");
+	else
+		r = sprintf(buf, "%d\n", test_bit(RB_BUFFERS_ON_BIT, p));
+
+	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+}
+
+static ssize_t
+rb_simple_write(struct file *filp, const char __user *ubuf,
+		size_t cnt, loff_t *ppos)
+{
+	long *p = filp->private_data;
+	char buf[64];
+	long val;
+	int ret;
+
+	if (cnt >= sizeof(buf))
+		return -EINVAL;
+
+	if (copy_from_user(&buf, ubuf, cnt))
+		return -EFAULT;
+
+	buf[cnt] = 0;
+
+	ret = strict_strtoul(buf, 10, &val);
+	if (ret < 0)
+		return ret;
+
+	if (val)
+		set_bit(RB_BUFFERS_ON_BIT, p);
+	else
+		clear_bit(RB_BUFFERS_ON_BIT, p);
+
+	(*ppos)++;
+
+	return cnt;
+}
+
+static struct file_operations rb_simple_fops = {
+	.open		= tracing_open_generic,
+	.read		= rb_simple_read,
+	.write		= rb_simple_write,
+};
+
+
+static __init int rb_init_debugfs(void)
+{
+	struct dentry *d_tracer;
+	struct dentry *entry;
+
+	d_tracer = tracing_init_dentry();
+
+	entry = debugfs_create_file("tracing_on", 0644, d_tracer,
+				    &ring_buffer_flags, &rb_simple_fops);
+	if (!entry)
+		pr_warning("Could not create debugfs 'tracing_on' entry\n");
+
+	return 0;
+}
+
+fs_initcall(rb_init_debugfs);
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8f3fb3db61c3..4185d5221633 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -14,6 +14,7 @@
 #include <linux/utsrelease.h>
 #include <linux/kallsyms.h>
 #include <linux/seq_file.h>
+#include <linux/notifier.h>
 #include <linux/debugfs.h>
 #include <linux/pagemap.h>
 #include <linux/hardirq.h>
@@ -22,6 +23,7 @@
 #include <linux/ftrace.h>
 #include <linux/module.h>
 #include <linux/percpu.h>
+#include <linux/kdebug.h>
 #include <linux/ctype.h>
 #include <linux/init.h>
 #include <linux/poll.h>
@@ -31,24 +33,97 @@
 #include <linux/writeback.h>
 
 #include <linux/stacktrace.h>
+#include <linux/ring_buffer.h>
+#include <linux/irqflags.h>
 
 #include "trace.h"
 
+#define TRACE_BUFFER_FLAGS	(RB_FL_OVERWRITE)
+
 unsigned long __read_mostly	tracing_max_latency = (cycle_t)ULONG_MAX;
 unsigned long __read_mostly	tracing_thresh;
 
-static unsigned long __read_mostly	tracing_nr_buffers;
+/*
+ * We need to change this state when a selftest is running.
+ * A selftest will lurk into the ring-buffer to count the
+ * entries inserted during the selftest although some concurrent
+ * insertions into the ring-buffer such as ftrace_printk could occurred
+ * at the same time, giving false positive or negative results.
+ */
+static bool __read_mostly tracing_selftest_running;
+
+/* For tracers that don't implement custom flags */
+static struct tracer_opt dummy_tracer_opt[] = {
+	{ }
+};
+
+static struct tracer_flags dummy_tracer_flags = {
+	.val = 0,
+	.opts = dummy_tracer_opt
+};
+
+static int dummy_set_flag(u32 old_flags, u32 bit, int set)
+{
+	return 0;
+}
+
+/*
+ * Kill all tracing for good (never come back).
+ * It is initialized to 1 but will turn to zero if the initialization
+ * of the tracer is successful. But that is the only place that sets
+ * this back to zero.
+ */
+int tracing_disabled = 1;
+
+static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled);
+
+static inline void ftrace_disable_cpu(void)
+{
+	preempt_disable();
+	local_inc(&__get_cpu_var(ftrace_cpu_disabled));
+}
+
+static inline void ftrace_enable_cpu(void)
+{
+	local_dec(&__get_cpu_var(ftrace_cpu_disabled));
+	preempt_enable();
+}
+
 static cpumask_t __read_mostly		tracing_buffer_mask;
 
 #define for_each_tracing_cpu(cpu)	\
 	for_each_cpu_mask(cpu, tracing_buffer_mask)
 
-static int trace_alloc_page(void);
-static int trace_free_page(void);
+/*
+ * ftrace_dump_on_oops - variable to dump ftrace buffer on oops
+ *
+ * If there is an oops (or kernel panic) and the ftrace_dump_on_oops
+ * is set, then ftrace_dump is called. This will output the contents
+ * of the ftrace buffers to the console.  This is very useful for
+ * capturing traces that lead to crashes and outputing it to a
+ * serial console.
+ *
+ * It is default off, but you can enable it with either specifying
+ * "ftrace_dump_on_oops" in the kernel command line, or setting
+ * /proc/sys/kernel/ftrace_dump_on_oops to true.
+ */
+int ftrace_dump_on_oops;
 
-static int tracing_disabled = 1;
+static int tracing_set_tracer(char *buf);
 
-static unsigned long tracing_pages_allocated;
+static int __init set_ftrace(char *str)
+{
+	tracing_set_tracer(str);
+	return 1;
+}
+__setup("ftrace", set_ftrace);
+
+static int __init set_ftrace_dump_on_oops(char *str)
+{
+	ftrace_dump_on_oops = 1;
+	return 1;
+}
+__setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops);
 
 long
 ns2usecs(cycle_t nsec)
@@ -60,7 +135,9 @@ ns2usecs(cycle_t nsec)
 
 cycle_t ftrace_now(int cpu)
 {
-	return cpu_clock(cpu);
+	u64 ts = ring_buffer_time_stamp(cpu);
+	ring_buffer_normalize_time_stamp(cpu, &ts);
+	return ts;
 }
 
 /*
@@ -96,15 +173,35 @@ static DEFINE_PER_CPU(struct trace_array_cpu, max_data);
 /* tracer_enabled is used to toggle activation of a tracer */
 static int			tracer_enabled = 1;
 
+/**
+ * tracing_is_enabled - return tracer_enabled status
+ *
+ * This function is used by other tracers to know the status
+ * of the tracer_enabled flag.  Tracers may use this function
+ * to know if it should enable their features when starting
+ * up. See irqsoff tracer for an example (start_irqsoff_tracer).
+ */
+int tracing_is_enabled(void)
+{
+	return tracer_enabled;
+}
+
 /* function tracing enabled */
 int				ftrace_function_enabled;
 
 /*
- * trace_nr_entries is the number of entries that is allocated
- * for a buffer. Note, the number of entries is always rounded
- * to ENTRIES_PER_PAGE.
+ * trace_buf_size is the size in bytes that is allocated
+ * for a buffer. Note, the number of bytes is always rounded
+ * to page size.
+ *
+ * This number is purposely set to a low number of 16384.
+ * If the dump on oops happens, it will be much appreciated
+ * to not have to wait for all that output. Anyway this can be
+ * boot time and run time configurable.
  */
-static unsigned long		trace_nr_entries = 65536UL;
+#define TRACE_BUF_SIZE_DEFAULT	1441792UL /* 16384 * 88 (sizeof(entry)) */
+
+static unsigned long		trace_buf_size = TRACE_BUF_SIZE_DEFAULT;
 
 /* trace_types holds a link list of available tracers. */
 static struct tracer		*trace_types __read_mostly;
@@ -130,26 +227,9 @@ static DEFINE_MUTEX(trace_types_lock);
 /* trace_wait is a waitqueue for tasks blocked on trace_poll */
 static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
 
-/* trace_flags holds iter_ctrl options */
-unsigned long trace_flags = TRACE_ITER_PRINT_PARENT;
-
-static notrace void no_trace_init(struct trace_array *tr)
-{
-	int cpu;
-
-	ftrace_function_enabled = 0;
-	if(tr->ctrl)
-		for_each_online_cpu(cpu)
-			tracing_reset(tr->data[cpu]);
-	tracer_enabled = 0;
-}
-
-/* dummy trace to disable tracing */
-static struct tracer no_tracer __read_mostly = {
-	.name		= "none",
-	.init		= no_trace_init
-};
-
+/* trace_flags holds trace_options default values */
+unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
+	TRACE_ITER_ANNOTATE;
 
 /**
  * trace_wake_up - wake up tasks waiting for trace input
@@ -167,51 +247,27 @@ void trace_wake_up(void)
 		wake_up(&trace_wait);
 }
 
-#define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry))
-
-static int __init set_nr_entries(char *str)
+static int __init set_buf_size(char *str)
 {
-	unsigned long nr_entries;
+	unsigned long buf_size;
 	int ret;
 
 	if (!str)
 		return 0;
-	ret = strict_strtoul(str, 0, &nr_entries);
+	ret = strict_strtoul(str, 0, &buf_size);
 	/* nr_entries can not be zero */
-	if (ret < 0 || nr_entries == 0)
+	if (ret < 0 || buf_size == 0)
 		return 0;
-	trace_nr_entries = nr_entries;
+	trace_buf_size = buf_size;
 	return 1;
 }
-__setup("trace_entries=", set_nr_entries);
+__setup("trace_buf_size=", set_buf_size);
 
 unsigned long nsecs_to_usecs(unsigned long nsecs)
 {
 	return nsecs / 1000;
 }
 
-/*
- * trace_flag_type is an enumeration that holds different
- * states when a trace occurs. These are:
- *  IRQS_OFF	- interrupts were disabled
- *  NEED_RESCED - reschedule is requested
- *  HARDIRQ	- inside an interrupt handler
- *  SOFTIRQ	- inside a softirq handler
- */
-enum trace_flag_type {
-	TRACE_FLAG_IRQS_OFF		= 0x01,
-	TRACE_FLAG_NEED_RESCHED		= 0x02,
-	TRACE_FLAG_HARDIRQ		= 0x04,
-	TRACE_FLAG_SOFTIRQ		= 0x08,
-};
-
-/*
- * TRACE_ITER_SYM_MASK masks the options in trace_flags that
- * control the output of kernel symbols.
- */
-#define TRACE_ITER_SYM_MASK \
-	(TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
-
 /* These must match the bit postions in trace_iterator_flags */
 static const char *trace_options[] = {
 	"print-parent",
@@ -224,6 +280,13 @@ static const char *trace_options[] = {
 	"block",
 	"stacktrace",
 	"sched-tree",
+	"ftrace_printk",
+	"ftrace_preempt",
+	"branch",
+	"annotate",
+	"userstacktrace",
+	"sym-userobj",
+	"printk-msg-only",
 	NULL
 };
 
@@ -257,7 +320,7 @@ __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
 
 	memcpy(data->comm, tsk->comm, TASK_COMM_LEN);
 	data->pid = tsk->pid;
-	data->uid = tsk->uid;
+	data->uid = task_uid(tsk);
 	data->nice = tsk->static_prio - 20 - MAX_RT_PRIO;
 	data->policy = tsk->policy;
 	data->rt_priority = tsk->rt_priority;
@@ -266,54 +329,6 @@ __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
 	tracing_record_cmdline(current);
 }
 
-#define CHECK_COND(cond)			\
-	if (unlikely(cond)) {			\
-		tracing_disabled = 1;		\
-		WARN_ON(1);			\
-		return -1;			\
-	}
-
-/**
- * check_pages - integrity check of trace buffers
- *
- * As a safty measure we check to make sure the data pages have not
- * been corrupted.
- */
-int check_pages(struct trace_array_cpu *data)
-{
-	struct page *page, *tmp;
-
-	CHECK_COND(data->trace_pages.next->prev != &data->trace_pages);
-	CHECK_COND(data->trace_pages.prev->next != &data->trace_pages);
-
-	list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) {
-		CHECK_COND(page->lru.next->prev != &page->lru);
-		CHECK_COND(page->lru.prev->next != &page->lru);
-	}
-
-	return 0;
-}
-
-/**
- * head_page - page address of the first page in per_cpu buffer.
- *
- * head_page returns the page address of the first page in
- * a per_cpu buffer. This also preforms various consistency
- * checks to make sure the buffer has not been corrupted.
- */
-void *head_page(struct trace_array_cpu *data)
-{
-	struct page *page;
-
-	if (list_empty(&data->trace_pages))
-		return NULL;
-
-	page = list_entry(data->trace_pages.next, struct page, lru);
-	BUG_ON(&page->lru == &data->trace_pages);
-
-	return page_address(page);
-}
-
 /**
  * trace_seq_printf - sequence printing of trace information
  * @s: trace sequence descriptor
@@ -395,34 +410,51 @@ trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
 	return len;
 }
 
-#define HEX_CHARS 17
-static const char hex2asc[] = "0123456789abcdef";
+#define MAX_MEMHEX_BYTES	8
+#define HEX_CHARS		(MAX_MEMHEX_BYTES*2 + 1)
 
 static int
 trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
 {
 	unsigned char hex[HEX_CHARS];
 	unsigned char *data = mem;
-	unsigned char byte;
 	int i, j;
 
-	BUG_ON(len >= HEX_CHARS);
-
 #ifdef __BIG_ENDIAN
 	for (i = 0, j = 0; i < len; i++) {
 #else
 	for (i = len-1, j = 0; i >= 0; i--) {
 #endif
-		byte = data[i];
-
-		hex[j++] = hex2asc[byte & 0x0f];
-		hex[j++] = hex2asc[byte >> 4];
+		hex[j++] = hex_asc_hi(data[i]);
+		hex[j++] = hex_asc_lo(data[i]);
 	}
 	hex[j++] = ' ';
 
 	return trace_seq_putmem(s, hex, j);
 }
 
+static int
+trace_seq_path(struct trace_seq *s, struct path *path)
+{
+	unsigned char *p;
+
+	if (s->len >= (PAGE_SIZE - 1))
+		return 0;
+	p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
+	if (!IS_ERR(p)) {
+		p = mangle_path(s->buffer + s->len, p, "\n");
+		if (p) {
+			s->len = p - s->buffer;
+			return 1;
+		}
+	} else {
+		s->buffer[s->len++] = '?';
+		return 1;
+	}
+
+	return 0;
+}
+
 static void
 trace_seq_reset(struct trace_seq *s)
 {
@@ -460,34 +492,6 @@ trace_print_seq(struct seq_file *m, struct trace_seq *s)
 	trace_seq_reset(s);
 }
 
-/*
- * flip the trace buffers between two trace descriptors.
- * This usually is the buffers between the global_trace and
- * the max_tr to record a snapshot of a current trace.
- *
- * The ftrace_max_lock must be held.
- */
-static void
-flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2)
-{
-	struct list_head flip_pages;
-
-	INIT_LIST_HEAD(&flip_pages);
-
-	memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx,
-		sizeof(struct trace_array_cpu) -
-		offsetof(struct trace_array_cpu, trace_head_idx));
-
-	check_pages(tr1);
-	check_pages(tr2);
-	list_splice_init(&tr1->trace_pages, &flip_pages);
-	list_splice_init(&tr2->trace_pages, &tr1->trace_pages);
-	list_splice_init(&flip_pages, &tr2->trace_pages);
-	BUG_ON(!list_empty(&flip_pages));
-	check_pages(tr1);
-	check_pages(tr2);
-}
-
 /**
  * update_max_tr - snapshot all trace buffers from global_trace to max_tr
  * @tr: tracer
@@ -500,17 +504,17 @@ flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2)
 void
 update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
 {
-	struct trace_array_cpu *data;
-	int i;
+	struct ring_buffer *buf = tr->buffer;
 
 	WARN_ON_ONCE(!irqs_disabled());
 	__raw_spin_lock(&ftrace_max_lock);
-	/* clear out all the previous traces */
-	for_each_tracing_cpu(i) {
-		data = tr->data[i];
-		flip_trace(max_tr.data[i], data);
-		tracing_reset(data);
-	}
+
+	tr->buffer = max_tr.buffer;
+	max_tr.buffer = buf;
+
+	ftrace_disable_cpu();
+	ring_buffer_reset(tr->buffer);
+	ftrace_enable_cpu();
 
 	__update_max_tr(tr, tsk, cpu);
 	__raw_spin_unlock(&ftrace_max_lock);
@@ -527,16 +531,19 @@ update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
 void
 update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
 {
-	struct trace_array_cpu *data = tr->data[cpu];
-	int i;
+	int ret;
 
 	WARN_ON_ONCE(!irqs_disabled());
 	__raw_spin_lock(&ftrace_max_lock);
-	for_each_tracing_cpu(i)
-		tracing_reset(max_tr.data[i]);
 
-	flip_trace(max_tr.data[cpu], data);
-	tracing_reset(data);
+	ftrace_disable_cpu();
+
+	ring_buffer_reset(max_tr.buffer);
+	ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu);
+
+	ftrace_enable_cpu();
+
+	WARN_ON_ONCE(ret);
 
 	__update_max_tr(tr, tsk, cpu);
 	__raw_spin_unlock(&ftrace_max_lock);
@@ -559,7 +566,17 @@ int register_tracer(struct tracer *type)
 		return -1;
 	}
 
+	/*
+	 * When this gets called we hold the BKL which means that
+	 * preemption is disabled. Various trace selftests however
+	 * need to disable and enable preemption for successful tests.
+	 * So we drop the BKL here and grab it after the tests again.
+	 */
+	unlock_kernel();
 	mutex_lock(&trace_types_lock);
+
+	tracing_selftest_running = true;
+
 	for (t = trace_types; t; t = t->next) {
 		if (strcmp(type->name, t->name) == 0) {
 			/* already found */
@@ -570,13 +587,20 @@ int register_tracer(struct tracer *type)
 		}
 	}
 
+	if (!type->set_flag)
+		type->set_flag = &dummy_set_flag;
+	if (!type->flags)
+		type->flags = &dummy_tracer_flags;
+	else
+		if (!type->flags->opts)
+			type->flags->opts = dummy_tracer_opt;
+
 #ifdef CONFIG_FTRACE_STARTUP_TEST
 	if (type->selftest) {
 		struct tracer *saved_tracer = current_trace;
-		struct trace_array_cpu *data;
 		struct trace_array *tr = &global_trace;
-		int saved_ctrl = tr->ctrl;
 		int i;
+
 		/*
 		 * Run a selftest on this tracer.
 		 * Here we reset the trace buffer, and set the current
@@ -584,31 +608,23 @@ int register_tracer(struct tracer *type)
 		 * internal tracing to verify that everything is in order.
 		 * If we fail, we do not register this tracer.
 		 */
-		for_each_tracing_cpu(i) {
-			data = tr->data[i];
-			if (!head_page(data))
-				continue;
-			tracing_reset(data);
-		}
+		for_each_tracing_cpu(i)
+			tracing_reset(tr, i);
+
 		current_trace = type;
-		tr->ctrl = 0;
 		/* the test is responsible for initializing and enabling */
 		pr_info("Testing tracer %s: ", type->name);
 		ret = type->selftest(type, tr);
 		/* the test is responsible for resetting too */
 		current_trace = saved_tracer;
-		tr->ctrl = saved_ctrl;
 		if (ret) {
 			printk(KERN_CONT "FAILED!\n");
 			goto out;
 		}
 		/* Only reset on passing, to avoid touching corrupted buffers */
-		for_each_tracing_cpu(i) {
-			data = tr->data[i];
-			if (!head_page(data))
-				continue;
-			tracing_reset(data);
-		}
+		for_each_tracing_cpu(i)
+			tracing_reset(tr, i);
+
 		printk(KERN_CONT "PASSED\n");
 	}
 #endif
@@ -620,7 +636,9 @@ int register_tracer(struct tracer *type)
 		max_tracer_type_len = len;
 
  out:
+	tracing_selftest_running = false;
 	mutex_unlock(&trace_types_lock);
+	lock_kernel();
 
 	return ret;
 }
@@ -653,13 +671,21 @@ void unregister_tracer(struct tracer *type)
 	mutex_unlock(&trace_types_lock);
 }
 
-void tracing_reset(struct trace_array_cpu *data)
+void tracing_reset(struct trace_array *tr, int cpu)
 {
-	data->trace_idx = 0;
-	data->overrun = 0;
-	data->trace_head = data->trace_tail = head_page(data);
-	data->trace_head_idx = 0;
-	data->trace_tail_idx = 0;
+	ftrace_disable_cpu();
+	ring_buffer_reset_cpu(tr->buffer, cpu);
+	ftrace_enable_cpu();
+}
+
+void tracing_reset_online_cpus(struct trace_array *tr)
+{
+	int cpu;
+
+	tr->time_start = ftrace_now(tr->cpu);
+
+	for_each_online_cpu(cpu)
+		tracing_reset(tr, cpu);
 }
 
 #define SAVED_CMDLINES 128
@@ -679,6 +705,91 @@ static void trace_init_cmdlines(void)
 	cmdline_idx = 0;
 }
 
+static int trace_stop_count;
+static DEFINE_SPINLOCK(tracing_start_lock);
+
+/**
+ * ftrace_off_permanent - disable all ftrace code permanently
+ *
+ * This should only be called when a serious anomally has
+ * been detected.  This will turn off the function tracing,
+ * ring buffers, and other tracing utilites. It takes no
+ * locks and can be called from any context.
+ */
+void ftrace_off_permanent(void)
+{
+	tracing_disabled = 1;
+	ftrace_stop();
+	tracing_off_permanent();
+}
+
+/**
+ * tracing_start - quick start of the tracer
+ *
+ * If tracing is enabled but was stopped by tracing_stop,
+ * this will start the tracer back up.
+ */
+void tracing_start(void)
+{
+	struct ring_buffer *buffer;
+	unsigned long flags;
+
+	if (tracing_disabled)
+		return;
+
+	spin_lock_irqsave(&tracing_start_lock, flags);
+	if (--trace_stop_count)
+		goto out;
+
+	if (trace_stop_count < 0) {
+		/* Someone screwed up their debugging */
+		WARN_ON_ONCE(1);
+		trace_stop_count = 0;
+		goto out;
+	}
+
+
+	buffer = global_trace.buffer;
+	if (buffer)
+		ring_buffer_record_enable(buffer);
+
+	buffer = max_tr.buffer;
+	if (buffer)
+		ring_buffer_record_enable(buffer);
+
+	ftrace_start();
+ out:
+	spin_unlock_irqrestore(&tracing_start_lock, flags);
+}
+
+/**
+ * tracing_stop - quick stop of the tracer
+ *
+ * Light weight way to stop tracing. Use in conjunction with
+ * tracing_start.
+ */
+void tracing_stop(void)
+{
+	struct ring_buffer *buffer;
+	unsigned long flags;
+
+	ftrace_stop();
+	spin_lock_irqsave(&tracing_start_lock, flags);
+	if (trace_stop_count++)
+		goto out;
+
+	buffer = global_trace.buffer;
+	if (buffer)
+		ring_buffer_record_disable(buffer);
+
+	buffer = max_tr.buffer;
+	if (buffer)
+		ring_buffer_record_disable(buffer);
+
+ out:
+	spin_unlock_irqrestore(&tracing_start_lock, flags);
+}
+
 void trace_stop_cmdline_recording(void);
 
 static void trace_save_cmdline(struct task_struct *tsk)
@@ -716,7 +827,7 @@ static void trace_save_cmdline(struct task_struct *tsk)
 	spin_unlock(&trace_cmdline_lock);
 }
 
-static char *trace_find_cmdline(int pid)
+char *trace_find_cmdline(int pid)
 {
 	char *cmdline = "<...>";
 	unsigned map;
@@ -745,82 +856,21 @@ void tracing_record_cmdline(struct task_struct *tsk)
 	trace_save_cmdline(tsk);
 }
 
-static inline struct list_head *
-trace_next_list(struct trace_array_cpu *data, struct list_head *next)
-{
-	/*
-	 * Roundrobin - but skip the head (which is not a real page):
-	 */
-	next = next->next;
-	if (unlikely(next == &data->trace_pages))
-		next = next->next;
-	BUG_ON(next == &data->trace_pages);
-
-	return next;
-}
-
-static inline void *
-trace_next_page(struct trace_array_cpu *data, void *addr)
-{
-	struct list_head *next;
-	struct page *page;
-
-	page = virt_to_page(addr);
-
-	next = trace_next_list(data, &page->lru);
-	page = list_entry(next, struct page, lru);
-
-	return page_address(page);
-}
-
-static inline struct trace_entry *
-tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data)
-{
-	unsigned long idx, idx_next;
-	struct trace_entry *entry;
-
-	data->trace_idx++;
-	idx = data->trace_head_idx;
-	idx_next = idx + 1;
-
-	BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE);
-
-	entry = data->trace_head + idx * TRACE_ENTRY_SIZE;
-
-	if (unlikely(idx_next >= ENTRIES_PER_PAGE)) {
-		data->trace_head = trace_next_page(data, data->trace_head);
-		idx_next = 0;
-	}
-
-	if (data->trace_head == data->trace_tail &&
-	    idx_next == data->trace_tail_idx) {
-		/* overrun */
-		data->overrun++;
-		data->trace_tail_idx++;
-		if (data->trace_tail_idx >= ENTRIES_PER_PAGE) {
-			data->trace_tail =
-				trace_next_page(data, data->trace_tail);
-			data->trace_tail_idx = 0;
-		}
-	}
-
-	data->trace_head_idx = idx_next;
-
-	return entry;
-}
-
-static inline void
-tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags)
+void
+tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
+			     int pc)
 {
 	struct task_struct *tsk = current;
-	unsigned long pc;
 
-	pc = preempt_count();
-
-	entry->preempt_count	= pc & 0xff;
-	entry->pid		= (tsk) ? tsk->pid : 0;
-	entry->t		= ftrace_now(raw_smp_processor_id());
-	entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
+	entry->preempt_count		= pc & 0xff;
+	entry->pid			= (tsk) ? tsk->pid : 0;
+	entry->tgid               	= (tsk) ? tsk->tgid : 0;
+	entry->flags =
+#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
+		(irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
+#else
+		TRACE_FLAG_IRQS_NOSUPPORT |
+#endif
 		((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
 		((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) |
 		(need_resched() ? TRACE_FLAG_NEED_RESCHED : 0);
@@ -828,145 +878,233 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags)
 
 void
 trace_function(struct trace_array *tr, struct trace_array_cpu *data,
-	       unsigned long ip, unsigned long parent_ip, unsigned long flags)
+	       unsigned long ip, unsigned long parent_ip, unsigned long flags,
+	       int pc)
 {
-	struct trace_entry *entry;
+	struct ring_buffer_event *event;
+	struct ftrace_entry *entry;
 	unsigned long irq_flags;
 
-	raw_local_irq_save(irq_flags);
-	__raw_spin_lock(&data->lock);
-	entry			= tracing_get_trace_entry(tr, data);
-	tracing_generic_entry_update(entry, flags);
-	entry->type		= TRACE_FN;
-	entry->fn.ip		= ip;
-	entry->fn.parent_ip	= parent_ip;
-	__raw_spin_unlock(&data->lock);
-	raw_local_irq_restore(irq_flags);
-}
+	/* If we are reading the ring buffer, don't trace */
+	if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
+		return;
 
-void
-ftrace(struct trace_array *tr, struct trace_array_cpu *data,
-       unsigned long ip, unsigned long parent_ip, unsigned long flags)
-{
-	if (likely(!atomic_read(&data->disabled)))
-		trace_function(tr, data, ip, parent_ip, flags);
+	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+					 &irq_flags);
+	if (!event)
+		return;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, flags, pc);
+	entry->ent.type			= TRACE_FN;
+	entry->ip			= ip;
+	entry->parent_ip		= parent_ip;
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+}
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+static void __trace_graph_entry(struct trace_array *tr,
+				struct trace_array_cpu *data,
+				struct ftrace_graph_ent *trace,
+				unsigned long flags,
+				int pc)
+{
+	struct ring_buffer_event *event;
+	struct ftrace_graph_ent_entry *entry;
+	unsigned long irq_flags;
+
+	if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
+		return;
+
+	event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry),
+					 &irq_flags);
+	if (!event)
+		return;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, flags, pc);
+	entry->ent.type			= TRACE_GRAPH_ENT;
+	entry->graph_ent			= *trace;
+	ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags);
 }
 
-#ifdef CONFIG_MMIOTRACE
-void __trace_mmiotrace_rw(struct trace_array *tr, struct trace_array_cpu *data,
-						struct mmiotrace_rw *rw)
+static void __trace_graph_return(struct trace_array *tr,
+				struct trace_array_cpu *data,
+				struct ftrace_graph_ret *trace,
+				unsigned long flags,
+				int pc)
 {
-	struct trace_entry *entry;
+	struct ring_buffer_event *event;
+	struct ftrace_graph_ret_entry *entry;
 	unsigned long irq_flags;
 
-	raw_local_irq_save(irq_flags);
-	__raw_spin_lock(&data->lock);
-
-	entry			= tracing_get_trace_entry(tr, data);
-	tracing_generic_entry_update(entry, 0);
-	entry->type		= TRACE_MMIO_RW;
-	entry->mmiorw		= *rw;
+	if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
+		return;
 
-	__raw_spin_unlock(&data->lock);
-	raw_local_irq_restore(irq_flags);
+	event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry),
+					 &irq_flags);
+	if (!event)
+		return;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, flags, pc);
+	entry->ent.type			= TRACE_GRAPH_RET;
+	entry->ret				= *trace;
+	ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags);
+}
+#endif
 
-	trace_wake_up();
+void
+ftrace(struct trace_array *tr, struct trace_array_cpu *data,
+       unsigned long ip, unsigned long parent_ip, unsigned long flags,
+       int pc)
+{
+	if (likely(!atomic_read(&data->disabled)))
+		trace_function(tr, data, ip, parent_ip, flags, pc);
 }
 
-void __trace_mmiotrace_map(struct trace_array *tr, struct trace_array_cpu *data,
-						struct mmiotrace_map *map)
+static void ftrace_trace_stack(struct trace_array *tr,
+			       struct trace_array_cpu *data,
+			       unsigned long flags,
+			       int skip, int pc)
 {
-	struct trace_entry *entry;
+#ifdef CONFIG_STACKTRACE
+	struct ring_buffer_event *event;
+	struct stack_entry *entry;
+	struct stack_trace trace;
 	unsigned long irq_flags;
 
-	raw_local_irq_save(irq_flags);
-	__raw_spin_lock(&data->lock);
+	if (!(trace_flags & TRACE_ITER_STACKTRACE))
+		return;
 
-	entry			= tracing_get_trace_entry(tr, data);
-	tracing_generic_entry_update(entry, 0);
-	entry->type		= TRACE_MMIO_MAP;
-	entry->mmiomap		= *map;
+	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+					 &irq_flags);
+	if (!event)
+		return;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, flags, pc);
+	entry->ent.type		= TRACE_STACK;
 
-	__raw_spin_unlock(&data->lock);
-	raw_local_irq_restore(irq_flags);
+	memset(&entry->caller, 0, sizeof(entry->caller));
 
-	trace_wake_up();
-}
+	trace.nr_entries	= 0;
+	trace.max_entries	= FTRACE_STACK_ENTRIES;
+	trace.skip		= skip;
+	trace.entries		= entry->caller;
+
+	save_stack_trace(&trace);
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
 #endif
+}
 
 void __trace_stack(struct trace_array *tr,
 		   struct trace_array_cpu *data,
 		   unsigned long flags,
 		   int skip)
 {
-	struct trace_entry *entry;
+	ftrace_trace_stack(tr, data, flags, skip, preempt_count());
+}
+
+static void ftrace_trace_userstack(struct trace_array *tr,
+		   struct trace_array_cpu *data,
+		   unsigned long flags, int pc)
+{
+#ifdef CONFIG_STACKTRACE
+	struct ring_buffer_event *event;
+	struct userstack_entry *entry;
 	struct stack_trace trace;
+	unsigned long irq_flags;
 
-	if (!(trace_flags & TRACE_ITER_STACKTRACE))
+	if (!(trace_flags & TRACE_ITER_USERSTACKTRACE))
 		return;
 
-	entry			= tracing_get_trace_entry(tr, data);
-	tracing_generic_entry_update(entry, flags);
-	entry->type		= TRACE_STACK;
+	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+					 &irq_flags);
+	if (!event)
+		return;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, flags, pc);
+	entry->ent.type		= TRACE_USER_STACK;
 
-	memset(&entry->stack, 0, sizeof(entry->stack));
+	memset(&entry->caller, 0, sizeof(entry->caller));
 
 	trace.nr_entries	= 0;
 	trace.max_entries	= FTRACE_STACK_ENTRIES;
-	trace.skip		= skip;
-	trace.entries		= entry->stack.caller;
+	trace.skip		= 0;
+	trace.entries		= entry->caller;
 
-	save_stack_trace(&trace);
+	save_stack_trace_user(&trace);
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+#endif
 }
 
-void
-__trace_special(void *__tr, void *__data,
-		unsigned long arg1, unsigned long arg2, unsigned long arg3)
+void __trace_userstack(struct trace_array *tr,
+		   struct trace_array_cpu *data,
+		   unsigned long flags)
 {
+	ftrace_trace_userstack(tr, data, flags, preempt_count());
+}
+
+static void
+ftrace_trace_special(void *__tr, void *__data,
+		     unsigned long arg1, unsigned long arg2, unsigned long arg3,
+		     int pc)
+{
+	struct ring_buffer_event *event;
 	struct trace_array_cpu *data = __data;
 	struct trace_array *tr = __tr;
-	struct trace_entry *entry;
+	struct special_entry *entry;
 	unsigned long irq_flags;
 
-	raw_local_irq_save(irq_flags);
-	__raw_spin_lock(&data->lock);
-	entry			= tracing_get_trace_entry(tr, data);
-	tracing_generic_entry_update(entry, 0);
-	entry->type		= TRACE_SPECIAL;
-	entry->special.arg1	= arg1;
-	entry->special.arg2	= arg2;
-	entry->special.arg3	= arg3;
-	__trace_stack(tr, data, irq_flags, 4);
-	__raw_spin_unlock(&data->lock);
-	raw_local_irq_restore(irq_flags);
+	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+					 &irq_flags);
+	if (!event)
+		return;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, 0, pc);
+	entry->ent.type			= TRACE_SPECIAL;
+	entry->arg1			= arg1;
+	entry->arg2			= arg2;
+	entry->arg3			= arg3;
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+	ftrace_trace_stack(tr, data, irq_flags, 4, pc);
+	ftrace_trace_userstack(tr, data, irq_flags, pc);
 
 	trace_wake_up();
 }
 
 void
+__trace_special(void *__tr, void *__data,
+		unsigned long arg1, unsigned long arg2, unsigned long arg3)
+{
+	ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count());
+}
+
+void
 tracing_sched_switch_trace(struct trace_array *tr,
 			   struct trace_array_cpu *data,
 			   struct task_struct *prev,
 			   struct task_struct *next,
-			   unsigned long flags)
+			   unsigned long flags, int pc)
 {
-	struct trace_entry *entry;
+	struct ring_buffer_event *event;
+	struct ctx_switch_entry *entry;
 	unsigned long irq_flags;
 
-	raw_local_irq_save(irq_flags);
-	__raw_spin_lock(&data->lock);
-	entry			= tracing_get_trace_entry(tr, data);
-	tracing_generic_entry_update(entry, flags);
-	entry->type		= TRACE_CTX;
-	entry->ctx.prev_pid	= prev->pid;
-	entry->ctx.prev_prio	= prev->prio;
-	entry->ctx.prev_state	= prev->state;
-	entry->ctx.next_pid	= next->pid;
-	entry->ctx.next_prio	= next->prio;
-	entry->ctx.next_state	= next->state;
-	__trace_stack(tr, data, flags, 5);
-	__raw_spin_unlock(&data->lock);
-	raw_local_irq_restore(irq_flags);
+	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+					   &irq_flags);
+	if (!event)
+		return;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, flags, pc);
+	entry->ent.type			= TRACE_CTX;
+	entry->prev_pid			= prev->pid;
+	entry->prev_prio		= prev->prio;
+	entry->prev_state		= prev->state;
+	entry->next_pid			= next->pid;
+	entry->next_prio		= next->prio;
+	entry->next_state		= next->state;
+	entry->next_cpu	= task_cpu(next);
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+	ftrace_trace_stack(tr, data, flags, 5, pc);
+	ftrace_trace_userstack(tr, data, flags, pc);
 }
 
 void
@@ -974,25 +1112,29 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
 			   struct trace_array_cpu *data,
 			   struct task_struct *wakee,
 			   struct task_struct *curr,
-			   unsigned long flags)
+			   unsigned long flags, int pc)
 {
-	struct trace_entry *entry;
+	struct ring_buffer_event *event;
+	struct ctx_switch_entry *entry;
 	unsigned long irq_flags;
 
-	raw_local_irq_save(irq_flags);
-	__raw_spin_lock(&data->lock);
-	entry			= tracing_get_trace_entry(tr, data);
-	tracing_generic_entry_update(entry, flags);
-	entry->type		= TRACE_WAKE;
-	entry->ctx.prev_pid	= curr->pid;
-	entry->ctx.prev_prio	= curr->prio;
-	entry->ctx.prev_state	= curr->state;
-	entry->ctx.next_pid	= wakee->pid;
-	entry->ctx.next_prio	= wakee->prio;
-	entry->ctx.next_state	= wakee->state;
-	__trace_stack(tr, data, flags, 6);
-	__raw_spin_unlock(&data->lock);
-	raw_local_irq_restore(irq_flags);
+	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+					   &irq_flags);
+	if (!event)
+		return;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, flags, pc);
+	entry->ent.type			= TRACE_WAKE;
+	entry->prev_pid			= curr->pid;
+	entry->prev_prio		= curr->prio;
+	entry->prev_state		= curr->state;
+	entry->next_pid			= wakee->pid;
+	entry->next_prio		= wakee->prio;
+	entry->next_state		= wakee->state;
+	entry->next_cpu			= task_cpu(wakee);
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+	ftrace_trace_stack(tr, data, flags, 6, pc);
+	ftrace_trace_userstack(tr, data, flags, pc);
 
 	trace_wake_up();
 }
@@ -1003,25 +1145,52 @@ ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
 	struct trace_array *tr = &global_trace;
 	struct trace_array_cpu *data;
 	unsigned long flags;
-	long disabled;
 	int cpu;
+	int pc;
 
-	if (tracing_disabled || current_trace == &no_tracer || !tr->ctrl)
+	if (tracing_disabled)
 		return;
 
+	pc = preempt_count();
 	local_irq_save(flags);
 	cpu = raw_smp_processor_id();
 	data = tr->data[cpu];
+
+	if (likely(atomic_inc_return(&data->disabled) == 1))
+		ftrace_trace_special(tr, data, arg1, arg2, arg3, pc);
+
+	atomic_dec(&data->disabled);
+	local_irq_restore(flags);
+}
+
+#ifdef CONFIG_FUNCTION_TRACER
+static void
+function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
+{
+	struct trace_array *tr = &global_trace;
+	struct trace_array_cpu *data;
+	unsigned long flags;
+	long disabled;
+	int cpu, resched;
+	int pc;
+
+	if (unlikely(!ftrace_function_enabled))
+		return;
+
+	pc = preempt_count();
+	resched = ftrace_preempt_disable();
+	local_save_flags(flags);
+	cpu = raw_smp_processor_id();
+	data = tr->data[cpu];
 	disabled = atomic_inc_return(&data->disabled);
 
 	if (likely(disabled == 1))
-		__trace_special(tr, data, arg1, arg2, arg3);
+		trace_function(tr, data, ip, parent_ip, flags, pc);
 
 	atomic_dec(&data->disabled);
-	local_irq_restore(flags);
+	ftrace_preempt_enable(resched);
 }
 
-#ifdef CONFIG_FTRACE
 static void
 function_trace_call(unsigned long ip, unsigned long parent_ip)
 {
@@ -1030,24 +1199,85 @@ function_trace_call(unsigned long ip, unsigned long parent_ip)
 	unsigned long flags;
 	long disabled;
 	int cpu;
+	int pc;
 
 	if (unlikely(!ftrace_function_enabled))
 		return;
 
-	if (skip_trace(ip))
-		return;
+	/*
+	 * Need to use raw, since this must be called before the
+	 * recursive protection is performed.
+	 */
+	local_irq_save(flags);
+	cpu = raw_smp_processor_id();
+	data = tr->data[cpu];
+	disabled = atomic_inc_return(&data->disabled);
+
+	if (likely(disabled == 1)) {
+		pc = preempt_count();
+		trace_function(tr, data, ip, parent_ip, flags, pc);
+	}
+
+	atomic_dec(&data->disabled);
+	local_irq_restore(flags);
+}
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+int trace_graph_entry(struct ftrace_graph_ent *trace)
+{
+	struct trace_array *tr = &global_trace;
+	struct trace_array_cpu *data;
+	unsigned long flags;
+	long disabled;
+	int cpu;
+	int pc;
+
+	if (!ftrace_trace_task(current))
+		return 0;
+
+	if (!ftrace_graph_addr(trace->func))
+		return 0;
 
 	local_irq_save(flags);
 	cpu = raw_smp_processor_id();
 	data = tr->data[cpu];
 	disabled = atomic_inc_return(&data->disabled);
+	if (likely(disabled == 1)) {
+		pc = preempt_count();
+		__trace_graph_entry(tr, data, trace, flags, pc);
+	}
+	/* Only do the atomic if it is not already set */
+	if (!test_tsk_trace_graph(current))
+		set_tsk_trace_graph(current);
+	atomic_dec(&data->disabled);
+	local_irq_restore(flags);
 
-	if (likely(disabled == 1))
-		trace_function(tr, data, ip, parent_ip, flags);
+	return 1;
+}
 
+void trace_graph_return(struct ftrace_graph_ret *trace)
+{
+	struct trace_array *tr = &global_trace;
+	struct trace_array_cpu *data;
+	unsigned long flags;
+	long disabled;
+	int cpu;
+	int pc;
+
+	local_irq_save(flags);
+	cpu = raw_smp_processor_id();
+	data = tr->data[cpu];
+	disabled = atomic_inc_return(&data->disabled);
+	if (likely(disabled == 1)) {
+		pc = preempt_count();
+		__trace_graph_return(tr, data, trace, flags, pc);
+	}
+	if (!trace->depth)
+		clear_tsk_trace_graph(current);
 	atomic_dec(&data->disabled);
 	local_irq_restore(flags);
 }
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 
 static struct ftrace_ops trace_ops __read_mostly =
 {
@@ -1057,9 +1287,14 @@ static struct ftrace_ops trace_ops __read_mostly =
 void tracing_start_function_trace(void)
 {
 	ftrace_function_enabled = 0;
+
+	if (trace_flags & TRACE_ITER_PREEMPTONLY)
+		trace_ops.func = function_trace_call_preempt_only;
+	else
+		trace_ops.func = function_trace_call;
+
 	register_ftrace_function(&trace_ops);
-	if (tracer_enabled)
-		ftrace_function_enabled = 1;
+	ftrace_function_enabled = 1;
 }
 
 void tracing_stop_function_trace(void)
@@ -1071,113 +1306,99 @@ void tracing_stop_function_trace(void)
 
 enum trace_file_type {
 	TRACE_FILE_LAT_FMT	= 1,
+	TRACE_FILE_ANNOTATE	= 2,
 };
 
-static struct trace_entry *
-trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data,
-		struct trace_iterator *iter, int cpu)
+static void trace_iterator_increment(struct trace_iterator *iter)
 {
-	struct page *page;
-	struct trace_entry *array;
+	/* Don't allow ftrace to trace into the ring buffers */
+	ftrace_disable_cpu();
 
-	if (iter->next_idx[cpu] >= tr->entries ||
-	    iter->next_idx[cpu] >= data->trace_idx ||
-	    (data->trace_head == data->trace_tail &&
-	     data->trace_head_idx == data->trace_tail_idx))
-		return NULL;
+	iter->idx++;
+	if (iter->buffer_iter[iter->cpu])
+		ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
 
-	if (!iter->next_page[cpu]) {
-		/* Initialize the iterator for this cpu trace buffer */
-		WARN_ON(!data->trace_tail);
-		page = virt_to_page(data->trace_tail);
-		iter->next_page[cpu] = &page->lru;
-		iter->next_page_idx[cpu] = data->trace_tail_idx;
-	}
+	ftrace_enable_cpu();
+}
 
-	page = list_entry(iter->next_page[cpu], struct page, lru);
-	BUG_ON(&data->trace_pages == &page->lru);
+static struct trace_entry *
+peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts)
+{
+	struct ring_buffer_event *event;
+	struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu];
 
-	array = page_address(page);
+	/* Don't allow ftrace to trace into the ring buffers */
+	ftrace_disable_cpu();
 
-	WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE);
-	return &array[iter->next_page_idx[cpu]];
+	if (buf_iter)
+		event = ring_buffer_iter_peek(buf_iter, ts);
+	else
+		event = ring_buffer_peek(iter->tr->buffer, cpu, ts);
+
+	ftrace_enable_cpu();
+
+	return event ? ring_buffer_event_data(event) : NULL;
 }
 
 static struct trace_entry *
-find_next_entry(struct trace_iterator *iter, int *ent_cpu)
+__find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts)
 {
-	struct trace_array *tr = iter->tr;
+	struct ring_buffer *buffer = iter->tr->buffer;
 	struct trace_entry *ent, *next = NULL;
+	u64 next_ts = 0, ts;
 	int next_cpu = -1;
 	int cpu;
 
 	for_each_tracing_cpu(cpu) {
-		if (!head_page(tr->data[cpu]))
+
+		if (ring_buffer_empty_cpu(buffer, cpu))
 			continue;
-		ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu);
+
+		ent = peek_next_entry(iter, cpu, &ts);
+
 		/*
 		 * Pick the entry with the smallest timestamp:
 		 */
-		if (ent && (!next || ent->t < next->t)) {
+		if (ent && (!next || ts < next_ts)) {
 			next = ent;
 			next_cpu = cpu;
+			next_ts = ts;
 		}
 	}
 
 	if (ent_cpu)
 		*ent_cpu = next_cpu;
 
+	if (ent_ts)
+		*ent_ts = next_ts;
+
 	return next;
 }
 
-static void trace_iterator_increment(struct trace_iterator *iter)
+/* Find the next real entry, without updating the iterator itself */
+static struct trace_entry *
+find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts)
 {
-	iter->idx++;
-	iter->next_idx[iter->cpu]++;
-	iter->next_page_idx[iter->cpu]++;
-
-	if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) {
-		struct trace_array_cpu *data = iter->tr->data[iter->cpu];
-
-		iter->next_page_idx[iter->cpu] = 0;
-		iter->next_page[iter->cpu] =
-			trace_next_list(data, iter->next_page[iter->cpu]);
-	}
+	return __find_next_entry(iter, ent_cpu, ent_ts);
 }
 
-static void trace_consume(struct trace_iterator *iter)
+/* Find the next real entry, and increment the iterator to the next entry */
+static void *find_next_entry_inc(struct trace_iterator *iter)
 {
-	struct trace_array_cpu *data = iter->tr->data[iter->cpu];
+	iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts);
 
-	data->trace_tail_idx++;
-	if (data->trace_tail_idx >= ENTRIES_PER_PAGE) {
-		data->trace_tail = trace_next_page(data, data->trace_tail);
-		data->trace_tail_idx = 0;
-	}
+	if (iter->ent)
+		trace_iterator_increment(iter);
 
-	/* Check if we empty it, then reset the index */
-	if (data->trace_head == data->trace_tail &&
-	    data->trace_head_idx == data->trace_tail_idx)
-		data->trace_idx = 0;
+	return iter->ent ? iter : NULL;
 }
 
-static void *find_next_entry_inc(struct trace_iterator *iter)
+static void trace_consume(struct trace_iterator *iter)
 {
-	struct trace_entry *next;
-	int next_cpu = -1;
-
-	next = find_next_entry(iter, &next_cpu);
-
-	iter->prev_ent = iter->ent;
-	iter->prev_cpu = iter->cpu;
-
-	iter->ent = next;
-	iter->cpu = next_cpu;
-
-	if (next)
-		trace_iterator_increment(iter);
-
-	return next ? iter : NULL;
+	/* Don't allow ftrace to trace into the ring buffers */
+	ftrace_disable_cpu();
+	ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts);
+	ftrace_enable_cpu();
 }
 
 static void *s_next(struct seq_file *m, void *v, loff_t *pos)
@@ -1210,7 +1431,7 @@ static void *s_start(struct seq_file *m, loff_t *pos)
 	struct trace_iterator *iter = m->private;
 	void *p = NULL;
 	loff_t l = 0;
-	int i;
+	int cpu;
 
 	mutex_lock(&trace_types_lock);
 
@@ -1221,22 +1442,19 @@ static void *s_start(struct seq_file *m, loff_t *pos)
 
 	atomic_inc(&trace_record_cmdline_disabled);
 
-	/* let the tracer grab locks here if needed */
-	if (current_trace->start)
-		current_trace->start(iter);
-
 	if (*pos != iter->pos) {
 		iter->ent = NULL;
 		iter->cpu = 0;
 		iter->idx = -1;
-		iter->prev_ent = NULL;
-		iter->prev_cpu = -1;
 
-		for_each_tracing_cpu(i) {
-			iter->next_idx[i] = 0;
-			iter->next_page[i] = NULL;
+		ftrace_disable_cpu();
+
+		for_each_tracing_cpu(cpu) {
+			ring_buffer_iter_reset(iter->buffer_iter[cpu]);
 		}
 
+		ftrace_enable_cpu();
+
 		for (p = iter; p && l < *pos; p = s_next(m, p, &l))
 			;
 
@@ -1250,28 +1468,24 @@ static void *s_start(struct seq_file *m, loff_t *pos)
 
 static void s_stop(struct seq_file *m, void *p)
 {
-	struct trace_iterator *iter = m->private;
-
 	atomic_dec(&trace_record_cmdline_disabled);
-
-	/* let the tracer release locks here if needed */
-	if (current_trace && current_trace == iter->trace && iter->trace->stop)
-		iter->trace->stop(iter);
-
 	mutex_unlock(&trace_types_lock);
 }
 
-#define KRETPROBE_MSG "[unknown/kretprobe'd]"
-
 #ifdef CONFIG_KRETPROBES
-static inline int kretprobed(unsigned long addr)
+static inline const char *kretprobed(const char *name)
 {
-	return addr == (unsigned long)kretprobe_trampoline;
+	static const char tramp_name[] = "kretprobe_trampoline";
+	int size = sizeof(tramp_name);
+
+	if (strncmp(tramp_name, name, size) == 0)
+		return "[unknown/kretprobe'd]";
+	return name;
 }
 #else
-static inline int kretprobed(unsigned long addr)
+static inline const char *kretprobed(const char *name)
 {
-	return 0;
+	return name;
 }
 #endif /* CONFIG_KRETPROBES */
 
@@ -1280,10 +1494,13 @@ seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 {
 #ifdef CONFIG_KALLSYMS
 	char str[KSYM_SYMBOL_LEN];
+	const char *name;
 
 	kallsyms_lookup(address, NULL, NULL, NULL, str);
 
-	return trace_seq_printf(s, fmt, str);
+	name = kretprobed(str);
+
+	return trace_seq_printf(s, fmt, name);
 #endif
 	return 1;
 }
@@ -1294,9 +1511,12 @@ seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 {
 #ifdef CONFIG_KALLSYMS
 	char str[KSYM_SYMBOL_LEN];
+	const char *name;
 
 	sprint_symbol(str, address);
-	return trace_seq_printf(s, fmt, str);
+	name = kretprobed(str);
+
+	return trace_seq_printf(s, fmt, name);
 #endif
 	return 1;
 }
@@ -1307,7 +1527,7 @@ seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 # define IP_FMT "%016lx"
 #endif
 
-static int
+int
 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 {
 	int ret;
@@ -1328,23 +1548,95 @@ seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 	return ret;
 }
 
+static inline int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
+				    unsigned long ip, unsigned long sym_flags)
+{
+	struct file *file = NULL;
+	unsigned long vmstart = 0;
+	int ret = 1;
+
+	if (mm) {
+		const struct vm_area_struct *vma;
+
+		down_read(&mm->mmap_sem);
+		vma = find_vma(mm, ip);
+		if (vma) {
+			file = vma->vm_file;
+			vmstart = vma->vm_start;
+		}
+		if (file) {
+			ret = trace_seq_path(s, &file->f_path);
+			if (ret)
+				ret = trace_seq_printf(s, "[+0x%lx]", ip - vmstart);
+		}
+		up_read(&mm->mmap_sem);
+	}
+	if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
+		ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
+	return ret;
+}
+
+static int
+seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
+		      unsigned long sym_flags)
+{
+	struct mm_struct *mm = NULL;
+	int ret = 1;
+	unsigned int i;
+
+	if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
+		struct task_struct *task;
+		/*
+		 * we do the lookup on the thread group leader,
+		 * since individual threads might have already quit!
+		 */
+		rcu_read_lock();
+		task = find_task_by_vpid(entry->ent.tgid);
+		if (task)
+			mm = get_task_mm(task);
+		rcu_read_unlock();
+	}
+
+	for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
+		unsigned long ip = entry->caller[i];
+
+		if (ip == ULONG_MAX || !ret)
+			break;
+		if (i && ret)
+			ret = trace_seq_puts(s, " <- ");
+		if (!ip) {
+			if (ret)
+				ret = trace_seq_puts(s, "??");
+			continue;
+		}
+		if (!ret)
+			break;
+		if (ret)
+			ret = seq_print_user_ip(s, mm, ip, sym_flags);
+	}
+
+	if (mm)
+		mmput(mm);
+	return ret;
+}
+
 static void print_lat_help_header(struct seq_file *m)
 {
-	seq_puts(m, "#                _------=> CPU#            \n");
-	seq_puts(m, "#               / _-----=> irqs-off        \n");
-	seq_puts(m, "#              | / _----=> need-resched    \n");
-	seq_puts(m, "#              || / _---=> hardirq/softirq \n");
-	seq_puts(m, "#              ||| / _--=> preempt-depth   \n");
-	seq_puts(m, "#              |||| /                      \n");
-	seq_puts(m, "#              |||||     delay             \n");
-	seq_puts(m, "#  cmd     pid ||||| time  |   caller      \n");
-	seq_puts(m, "#     \\   /    |||||   \\   |   /           \n");
+	seq_puts(m, "#                  _------=> CPU#            \n");
+	seq_puts(m, "#                 / _-----=> irqs-off        \n");
+	seq_puts(m, "#                | / _----=> need-resched    \n");
+	seq_puts(m, "#                || / _---=> hardirq/softirq \n");
+	seq_puts(m, "#                ||| / _--=> preempt-depth   \n");
+	seq_puts(m, "#                |||| /                      \n");
+	seq_puts(m, "#                |||||     delay             \n");
+	seq_puts(m, "#  cmd     pid   ||||| time  |   caller      \n");
+	seq_puts(m, "#     \\   /      |||||   \\   |   /           \n");
 }
 
 static void print_func_help_header(struct seq_file *m)
 {
-	seq_puts(m, "#           TASK-PID   CPU#    TIMESTAMP  FUNCTION\n");
-	seq_puts(m, "#              | |      |          |         |\n");
+	seq_puts(m, "#           TASK-PID    CPU#    TIMESTAMP  FUNCTION\n");
+	seq_puts(m, "#              | |       |          |         |\n");
 }
 
 
@@ -1355,23 +1647,16 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
 	struct trace_array *tr = iter->tr;
 	struct trace_array_cpu *data = tr->data[tr->cpu];
 	struct tracer *type = current_trace;
-	unsigned long total   = 0;
-	unsigned long entries = 0;
-	int cpu;
+	unsigned long total;
+	unsigned long entries;
 	const char *name = "preemption";
 
 	if (type)
 		name = type->name;
 
-	for_each_tracing_cpu(cpu) {
-		if (head_page(tr->data[cpu])) {
-			total += tr->data[cpu]->trace_idx;
-			if (tr->data[cpu]->trace_idx > tr->entries)
-				entries += tr->entries;
-			else
-				entries += tr->data[cpu]->trace_idx;
-		}
-	}
+	entries = ring_buffer_entries(iter->tr->buffer);
+	total = entries +
+		ring_buffer_overruns(iter->tr->buffer);
 
 	seq_printf(m, "%s latency trace v1.1.5 on %s\n",
 		   name, UTS_RELEASE);
@@ -1428,9 +1713,10 @@ lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 	comm = trace_find_cmdline(entry->pid);
 
 	trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid);
-	trace_seq_printf(s, "%d", cpu);
+	trace_seq_printf(s, "%3d", cpu);
 	trace_seq_printf(s, "%c%c",
-			(entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.',
+			(entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
+			 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.',
 			((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.'));
 
 	hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
@@ -1457,7 +1743,7 @@ lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 unsigned long preempt_mark_thresh = 100;
 
 static void
-lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs,
+lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 		    unsigned long rel_usecs)
 {
 	trace_seq_printf(s, " %4lldus", abs_usecs);
@@ -1471,34 +1757,101 @@ lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs,
 
 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 
-static int
+static int task_state_char(unsigned long state)
+{
+	int bit = state ? __ffs(state) + 1 : 0;
+
+	return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
+}
+
+/*
+ * The message is supposed to contain an ending newline.
+ * If the printing stops prematurely, try to add a newline of our own.
+ */
+void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter)
+{
+	struct trace_entry *ent;
+	struct trace_field_cont *cont;
+	bool ok = true;
+
+	ent = peek_next_entry(iter, iter->cpu, NULL);
+	if (!ent || ent->type != TRACE_CONT) {
+		trace_seq_putc(s, '\n');
+		return;
+	}
+
+	do {
+		cont = (struct trace_field_cont *)ent;
+		if (ok)
+			ok = (trace_seq_printf(s, "%s", cont->buf) > 0);
+
+		ftrace_disable_cpu();
+
+		if (iter->buffer_iter[iter->cpu])
+			ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
+		else
+			ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL);
+
+		ftrace_enable_cpu();
+
+		ent = peek_next_entry(iter, iter->cpu, NULL);
+	} while (ent && ent->type == TRACE_CONT);
+
+	if (!ok)
+		trace_seq_putc(s, '\n');
+}
+
+static void test_cpu_buff_start(struct trace_iterator *iter)
+{
+	struct trace_seq *s = &iter->seq;
+
+	if (!(trace_flags & TRACE_ITER_ANNOTATE))
+		return;
+
+	if (!(iter->iter_flags & TRACE_FILE_ANNOTATE))
+		return;
+
+	if (cpu_isset(iter->cpu, iter->started))
+		return;
+
+	cpu_set(iter->cpu, iter->started);
+	trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu);
+}
+
+static enum print_line_t
 print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
 {
 	struct trace_seq *s = &iter->seq;
 	unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
-	struct trace_entry *next_entry = find_next_entry(iter, NULL);
+	struct trace_entry *next_entry;
 	unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 	struct trace_entry *entry = iter->ent;
 	unsigned long abs_usecs;
 	unsigned long rel_usecs;
+	u64 next_ts;
 	char *comm;
 	int S, T;
 	int i;
-	unsigned state;
 
+	if (entry->type == TRACE_CONT)
+		return TRACE_TYPE_HANDLED;
+
+	test_cpu_buff_start(iter);
+
+	next_entry = find_next_entry(iter, NULL, &next_ts);
 	if (!next_entry)
-		next_entry = entry;
-	rel_usecs = ns2usecs(next_entry->t - entry->t);
-	abs_usecs = ns2usecs(entry->t - iter->tr->time_start);
+		next_ts = iter->ts;
+	rel_usecs = ns2usecs(next_ts - iter->ts);
+	abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 
 	if (verbose) {
 		comm = trace_find_cmdline(entry->pid);
-		trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]"
+		trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]"
 				 " %ld.%03ldms (+%ld.%03ldms): ",
 				 comm,
 				 entry->pid, cpu, entry->flags,
 				 entry->preempt_count, trace_idx,
-				 ns2usecs(entry->t),
+				 ns2usecs(iter->ts),
 				 abs_usecs/1000,
 				 abs_usecs % 1000, rel_usecs/1000,
 				 rel_usecs % 1000);
@@ -1507,52 +1860,99 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
 		lat_print_timestamp(s, abs_usecs, rel_usecs);
 	}
 	switch (entry->type) {
-	case TRACE_FN:
-		seq_print_ip_sym(s, entry->fn.ip, sym_flags);
+	case TRACE_FN: {
+		struct ftrace_entry *field;
+
+		trace_assign_type(field, entry);
+
+		seq_print_ip_sym(s, field->ip, sym_flags);
 		trace_seq_puts(s, " (");
-		if (kretprobed(entry->fn.parent_ip))
-			trace_seq_puts(s, KRETPROBE_MSG);
-		else
-			seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags);
+		seq_print_ip_sym(s, field->parent_ip, sym_flags);
 		trace_seq_puts(s, ")\n");
 		break;
+	}
 	case TRACE_CTX:
-	case TRACE_WAKE:
-		T = entry->ctx.next_state < sizeof(state_to_char) ?
-			state_to_char[entry->ctx.next_state] : 'X';
-
-		state = entry->ctx.prev_state ? __ffs(entry->ctx.prev_state) + 1 : 0;
-		S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X';
-		comm = trace_find_cmdline(entry->ctx.next_pid);
-		trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c %s\n",
-				 entry->ctx.prev_pid,
-				 entry->ctx.prev_prio,
+	case TRACE_WAKE: {
+		struct ctx_switch_entry *field;
+
+		trace_assign_type(field, entry);
+
+		T = task_state_char(field->next_state);
+		S = task_state_char(field->prev_state);
+		comm = trace_find_cmdline(field->next_pid);
+		trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
+				 field->prev_pid,
+				 field->prev_prio,
 				 S, entry->type == TRACE_CTX ? "==>" : "  +",
-				 entry->ctx.next_pid,
-				 entry->ctx.next_prio,
+				 field->next_cpu,
+				 field->next_pid,
+				 field->next_prio,
 				 T, comm);
 		break;
-	case TRACE_SPECIAL:
+	}
+	case TRACE_SPECIAL: {
+		struct special_entry *field;
+
+		trace_assign_type(field, entry);
+
 		trace_seq_printf(s, "# %ld %ld %ld\n",
-				 entry->special.arg1,
-				 entry->special.arg2,
-				 entry->special.arg3);
+				 field->arg1,
+				 field->arg2,
+				 field->arg3);
 		break;
-	case TRACE_STACK:
+	}
+	case TRACE_STACK: {
+		struct stack_entry *field;
+
+		trace_assign_type(field, entry);
+
 		for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 			if (i)
 				trace_seq_puts(s, " <= ");
-			seq_print_ip_sym(s, entry->stack.caller[i], sym_flags);
+			seq_print_ip_sym(s, field->caller[i], sym_flags);
 		}
 		trace_seq_puts(s, "\n");
 		break;
+	}
+	case TRACE_PRINT: {
+		struct print_entry *field;
+
+		trace_assign_type(field, entry);
+
+		seq_print_ip_sym(s, field->ip, sym_flags);
+		trace_seq_printf(s, ": %s", field->buf);
+		if (entry->flags & TRACE_FLAG_CONT)
+			trace_seq_print_cont(s, iter);
+		break;
+	}
+	case TRACE_BRANCH: {
+		struct trace_branch *field;
+
+		trace_assign_type(field, entry);
+
+		trace_seq_printf(s, "[%s] %s:%s:%d\n",
+				 field->correct ? "  ok  " : " MISS ",
+				 field->func,
+				 field->file,
+				 field->line);
+		break;
+	}
+	case TRACE_USER_STACK: {
+		struct userstack_entry *field;
+
+		trace_assign_type(field, entry);
+
+		seq_print_userip_objs(field, s, sym_flags);
+		trace_seq_putc(s, '\n');
+		break;
+	}
 	default:
 		trace_seq_printf(s, "Unknown type %d\n", entry->type);
 	}
-	return 1;
+	return TRACE_TYPE_HANDLED;
 }
 
-static int print_trace_fmt(struct trace_iterator *iter)
+static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
 {
 	struct trace_seq *s = &iter->seq;
 	unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
@@ -1567,90 +1967,154 @@ static int print_trace_fmt(struct trace_iterator *iter)
 
 	entry = iter->ent;
 
+	if (entry->type == TRACE_CONT)
+		return TRACE_TYPE_HANDLED;
+
+	test_cpu_buff_start(iter);
+
 	comm = trace_find_cmdline(iter->ent->pid);
 
-	t = ns2usecs(entry->t);
+	t = ns2usecs(iter->ts);
 	usec_rem = do_div(t, 1000000ULL);
 	secs = (unsigned long)t;
 
 	ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid);
 	if (!ret)
-		return 0;
-	ret = trace_seq_printf(s, "[%02d] ", iter->cpu);
+		return TRACE_TYPE_PARTIAL_LINE;
+	ret = trace_seq_printf(s, "[%03d] ", iter->cpu);
 	if (!ret)
-		return 0;
+		return TRACE_TYPE_PARTIAL_LINE;
 	ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem);
 	if (!ret)
-		return 0;
+		return TRACE_TYPE_PARTIAL_LINE;
 
 	switch (entry->type) {
-	case TRACE_FN:
-		ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags);
+	case TRACE_FN: {
+		struct ftrace_entry *field;
+
+		trace_assign_type(field, entry);
+
+		ret = seq_print_ip_sym(s, field->ip, sym_flags);
 		if (!ret)
-			return 0;
+			return TRACE_TYPE_PARTIAL_LINE;
 		if ((sym_flags & TRACE_ITER_PRINT_PARENT) &&
-						entry->fn.parent_ip) {
+						field->parent_ip) {
 			ret = trace_seq_printf(s, " <-");
 			if (!ret)
-				return 0;
-			if (kretprobed(entry->fn.parent_ip))
-				ret = trace_seq_puts(s, KRETPROBE_MSG);
-			else
-				ret = seq_print_ip_sym(s, entry->fn.parent_ip,
-						       sym_flags);
+				return TRACE_TYPE_PARTIAL_LINE;
+			ret = seq_print_ip_sym(s,
+					       field->parent_ip,
+					       sym_flags);
 			if (!ret)
-				return 0;
+				return TRACE_TYPE_PARTIAL_LINE;
 		}
 		ret = trace_seq_printf(s, "\n");
 		if (!ret)
-			return 0;
+			return TRACE_TYPE_PARTIAL_LINE;
 		break;
+	}
 	case TRACE_CTX:
-	case TRACE_WAKE:
-		S = entry->ctx.prev_state < sizeof(state_to_char) ?
-			state_to_char[entry->ctx.prev_state] : 'X';
-		T = entry->ctx.next_state < sizeof(state_to_char) ?
-			state_to_char[entry->ctx.next_state] : 'X';
-		ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c\n",
-				       entry->ctx.prev_pid,
-				       entry->ctx.prev_prio,
+	case TRACE_WAKE: {
+		struct ctx_switch_entry *field;
+
+		trace_assign_type(field, entry);
+
+		T = task_state_char(field->next_state);
+		S = task_state_char(field->prev_state);
+		ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n",
+				       field->prev_pid,
+				       field->prev_prio,
 				       S,
 				       entry->type == TRACE_CTX ? "==>" : "  +",
-				       entry->ctx.next_pid,
-				       entry->ctx.next_prio,
+				       field->next_cpu,
+				       field->next_pid,
+				       field->next_prio,
 				       T);
 		if (!ret)
-			return 0;
+			return TRACE_TYPE_PARTIAL_LINE;
 		break;
-	case TRACE_SPECIAL:
+	}
+	case TRACE_SPECIAL: {
+		struct special_entry *field;
+
+		trace_assign_type(field, entry);
+
 		ret = trace_seq_printf(s, "# %ld %ld %ld\n",
-				 entry->special.arg1,
-				 entry->special.arg2,
-				 entry->special.arg3);
+				 field->arg1,
+				 field->arg2,
+				 field->arg3);
 		if (!ret)
-			return 0;
+			return TRACE_TYPE_PARTIAL_LINE;
 		break;
-	case TRACE_STACK:
+	}
+	case TRACE_STACK: {
+		struct stack_entry *field;
+
+		trace_assign_type(field, entry);
+
 		for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 			if (i) {
 				ret = trace_seq_puts(s, " <= ");
 				if (!ret)
-					return 0;
+					return TRACE_TYPE_PARTIAL_LINE;
 			}
-			ret = seq_print_ip_sym(s, entry->stack.caller[i],
+			ret = seq_print_ip_sym(s, field->caller[i],
 					       sym_flags);
 			if (!ret)
-				return 0;
+				return TRACE_TYPE_PARTIAL_LINE;
 		}
 		ret = trace_seq_puts(s, "\n");
 		if (!ret)
-			return 0;
+			return TRACE_TYPE_PARTIAL_LINE;
 		break;
 	}
-	return 1;
+	case TRACE_PRINT: {
+		struct print_entry *field;
+
+		trace_assign_type(field, entry);
+
+		seq_print_ip_sym(s, field->ip, sym_flags);
+		trace_seq_printf(s, ": %s", field->buf);
+		if (entry->flags & TRACE_FLAG_CONT)
+			trace_seq_print_cont(s, iter);
+		break;
+	}
+	case TRACE_GRAPH_RET: {
+		return print_graph_function(iter);
+	}
+	case TRACE_GRAPH_ENT: {
+		return print_graph_function(iter);
+	}
+	case TRACE_BRANCH: {
+		struct trace_branch *field;
+
+		trace_assign_type(field, entry);
+
+		trace_seq_printf(s, "[%s] %s:%s:%d\n",
+				 field->correct ? "  ok  " : " MISS ",
+				 field->func,
+				 field->file,
+				 field->line);
+		break;
+	}
+	case TRACE_USER_STACK: {
+		struct userstack_entry *field;
+
+		trace_assign_type(field, entry);
+
+		ret = seq_print_userip_objs(field, s, sym_flags);
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+		ret = trace_seq_putc(s, '\n');
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+		break;
+	}
+	}
+	return TRACE_TYPE_HANDLED;
 }
 
-static int print_raw_fmt(struct trace_iterator *iter)
+static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
 {
 	struct trace_seq *s = &iter->seq;
 	struct trace_entry *entry;
@@ -1659,47 +2123,75 @@ static int print_raw_fmt(struct trace_iterator *iter)
 
 	entry = iter->ent;
 
+	if (entry->type == TRACE_CONT)
+		return TRACE_TYPE_HANDLED;
+
 	ret = trace_seq_printf(s, "%d %d %llu ",
-		entry->pid, iter->cpu, entry->t);
+		entry->pid, iter->cpu, iter->ts);
 	if (!ret)
-		return 0;
+		return TRACE_TYPE_PARTIAL_LINE;
 
 	switch (entry->type) {
-	case TRACE_FN:
+	case TRACE_FN: {
+		struct ftrace_entry *field;
+
+		trace_assign_type(field, entry);
+
 		ret = trace_seq_printf(s, "%x %x\n",
-					entry->fn.ip, entry->fn.parent_ip);
+					field->ip,
+					field->parent_ip);
 		if (!ret)
-			return 0;
+			return TRACE_TYPE_PARTIAL_LINE;
 		break;
+	}
 	case TRACE_CTX:
-	case TRACE_WAKE:
-		S = entry->ctx.prev_state < sizeof(state_to_char) ?
-			state_to_char[entry->ctx.prev_state] : 'X';
-		T = entry->ctx.next_state < sizeof(state_to_char) ?
-			state_to_char[entry->ctx.next_state] : 'X';
-		if (entry->type == TRACE_WAKE)
-			S = '+';
-		ret = trace_seq_printf(s, "%d %d %c %d %d %c\n",
-				       entry->ctx.prev_pid,
-				       entry->ctx.prev_prio,
+	case TRACE_WAKE: {
+		struct ctx_switch_entry *field;
+
+		trace_assign_type(field, entry);
+
+		T = task_state_char(field->next_state);
+		S = entry->type == TRACE_WAKE ? '+' :
+			task_state_char(field->prev_state);
+		ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n",
+				       field->prev_pid,
+				       field->prev_prio,
 				       S,
-				       entry->ctx.next_pid,
-				       entry->ctx.next_prio,
+				       field->next_cpu,
+				       field->next_pid,
+				       field->next_prio,
 				       T);
 		if (!ret)
-			return 0;
+			return TRACE_TYPE_PARTIAL_LINE;
 		break;
+	}
 	case TRACE_SPECIAL:
-	case TRACE_STACK:
+	case TRACE_USER_STACK:
+	case TRACE_STACK: {
+		struct special_entry *field;
+
+		trace_assign_type(field, entry);
+
 		ret = trace_seq_printf(s, "# %ld %ld %ld\n",
-				 entry->special.arg1,
-				 entry->special.arg2,
-				 entry->special.arg3);
+				 field->arg1,
+				 field->arg2,
+				 field->arg3);
 		if (!ret)
-			return 0;
+			return TRACE_TYPE_PARTIAL_LINE;
 		break;
 	}
-	return 1;
+	case TRACE_PRINT: {
+		struct print_entry *field;
+
+		trace_assign_type(field, entry);
+
+		trace_seq_printf(s, "# %lx %s", field->ip, field->buf);
+		if (entry->flags & TRACE_FLAG_CONT)
+			trace_seq_print_cont(s, iter);
+		break;
+	}
+	}
+	return TRACE_TYPE_HANDLED;
 }
 
 #define SEQ_PUT_FIELD_RET(s, x)				\
@@ -1710,11 +2202,12 @@ do {							\
 
 #define SEQ_PUT_HEX_FIELD_RET(s, x)			\
 do {							\
+	BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES);	\
 	if (!trace_seq_putmem_hex(s, &(x), sizeof(x)))	\
 		return 0;				\
 } while (0)
 
-static int print_hex_fmt(struct trace_iterator *iter)
+static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
 {
 	struct trace_seq *s = &iter->seq;
 	unsigned char newline = '\n';
@@ -1723,97 +2216,162 @@ static int print_hex_fmt(struct trace_iterator *iter)
 
 	entry = iter->ent;
 
+	if (entry->type == TRACE_CONT)
+		return TRACE_TYPE_HANDLED;
+
 	SEQ_PUT_HEX_FIELD_RET(s, entry->pid);
 	SEQ_PUT_HEX_FIELD_RET(s, iter->cpu);
-	SEQ_PUT_HEX_FIELD_RET(s, entry->t);
+	SEQ_PUT_HEX_FIELD_RET(s, iter->ts);
 
 	switch (entry->type) {
-	case TRACE_FN:
-		SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip);
-		SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip);
+	case TRACE_FN: {
+		struct ftrace_entry *field;
+
+		trace_assign_type(field, entry);
+
+		SEQ_PUT_HEX_FIELD_RET(s, field->ip);
+		SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 		break;
+	}
 	case TRACE_CTX:
-	case TRACE_WAKE:
-		S = entry->ctx.prev_state < sizeof(state_to_char) ?
-			state_to_char[entry->ctx.prev_state] : 'X';
-		T = entry->ctx.next_state < sizeof(state_to_char) ?
-			state_to_char[entry->ctx.next_state] : 'X';
-		if (entry->type == TRACE_WAKE)
-			S = '+';
-		SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid);
-		SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio);
+	case TRACE_WAKE: {
+		struct ctx_switch_entry *field;
+
+		trace_assign_type(field, entry);
+
+		T = task_state_char(field->next_state);
+		S = entry->type == TRACE_WAKE ? '+' :
+			task_state_char(field->prev_state);
+		SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
+		SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 		SEQ_PUT_HEX_FIELD_RET(s, S);
-		SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid);
-		SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio);
-		SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip);
+		SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
+		SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
+		SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 		SEQ_PUT_HEX_FIELD_RET(s, T);
 		break;
+	}
 	case TRACE_SPECIAL:
-	case TRACE_STACK:
-		SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1);
-		SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2);
-		SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3);
+	case TRACE_USER_STACK:
+	case TRACE_STACK: {
+		struct special_entry *field;
+
+		trace_assign_type(field, entry);
+
+		SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
+		SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
+		SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 		break;
 	}
+	}
 	SEQ_PUT_FIELD_RET(s, newline);
 
-	return 1;
+	return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t print_printk_msg_only(struct trace_iterator *iter)
+{
+	struct trace_seq *s = &iter->seq;
+	struct trace_entry *entry = iter->ent;
+	struct print_entry *field;
+	int ret;
+
+	trace_assign_type(field, entry);
+
+	ret = trace_seq_printf(s, field->buf);
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	if (entry->flags & TRACE_FLAG_CONT)
+		trace_seq_print_cont(s, iter);
+
+	return TRACE_TYPE_HANDLED;
 }
 
-static int print_bin_fmt(struct trace_iterator *iter)
+static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
 {
 	struct trace_seq *s = &iter->seq;
 	struct trace_entry *entry;
 
 	entry = iter->ent;
 
+	if (entry->type == TRACE_CONT)
+		return TRACE_TYPE_HANDLED;
+
 	SEQ_PUT_FIELD_RET(s, entry->pid);
 	SEQ_PUT_FIELD_RET(s, entry->cpu);
-	SEQ_PUT_FIELD_RET(s, entry->t);
+	SEQ_PUT_FIELD_RET(s, iter->ts);
 
 	switch (entry->type) {
-	case TRACE_FN:
-		SEQ_PUT_FIELD_RET(s, entry->fn.ip);
-		SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip);
+	case TRACE_FN: {
+		struct ftrace_entry *field;
+
+		trace_assign_type(field, entry);
+
+		SEQ_PUT_FIELD_RET(s, field->ip);
+		SEQ_PUT_FIELD_RET(s, field->parent_ip);
 		break;
-	case TRACE_CTX:
-		SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid);
-		SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio);
-		SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state);
-		SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid);
-		SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio);
-		SEQ_PUT_FIELD_RET(s, entry->ctx.next_state);
+	}
+	case TRACE_CTX: {
+		struct ctx_switch_entry *field;
+
+		trace_assign_type(field, entry);
+
+		SEQ_PUT_FIELD_RET(s, field->prev_pid);
+		SEQ_PUT_FIELD_RET(s, field->prev_prio);
+		SEQ_PUT_FIELD_RET(s, field->prev_state);
+		SEQ_PUT_FIELD_RET(s, field->next_pid);
+		SEQ_PUT_FIELD_RET(s, field->next_prio);
+		SEQ_PUT_FIELD_RET(s, field->next_state);
 		break;
+	}
 	case TRACE_SPECIAL:
-	case TRACE_STACK:
-		SEQ_PUT_FIELD_RET(s, entry->special.arg1);
-		SEQ_PUT_FIELD_RET(s, entry->special.arg2);
-		SEQ_PUT_FIELD_RET(s, entry->special.arg3);
+	case TRACE_USER_STACK:
+	case TRACE_STACK: {
+		struct special_entry *field;
+
+		trace_assign_type(field, entry);
+
+		SEQ_PUT_FIELD_RET(s, field->arg1);
+		SEQ_PUT_FIELD_RET(s, field->arg2);
+		SEQ_PUT_FIELD_RET(s, field->arg3);
 		break;
 	}
+	}
 	return 1;
 }
 
 static int trace_empty(struct trace_iterator *iter)
 {
-	struct trace_array_cpu *data;
 	int cpu;
 
 	for_each_tracing_cpu(cpu) {
-		data = iter->tr->data[cpu];
-
-		if (head_page(data) && data->trace_idx &&
-		    (data->trace_tail != data->trace_head ||
-		     data->trace_tail_idx != data->trace_head_idx))
-			return 0;
+		if (iter->buffer_iter[cpu]) {
+			if (!ring_buffer_iter_empty(iter->buffer_iter[cpu]))
+				return 0;
+		} else {
+			if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu))
+				return 0;
+		}
 	}
+
 	return 1;
 }
 
-static int print_trace_line(struct trace_iterator *iter)
+static enum print_line_t print_trace_line(struct trace_iterator *iter)
 {
-	if (iter->trace && iter->trace->print_line)
-		return iter->trace->print_line(iter);
+	enum print_line_t ret;
+
+	if (iter->trace && iter->trace->print_line) {
+		ret = iter->trace->print_line(iter);
+		if (ret != TRACE_TYPE_UNHANDLED)
+			return ret;
+	}
+
+	if (iter->ent->type == TRACE_PRINT &&
+			trace_flags & TRACE_ITER_PRINTK &&
+			trace_flags & TRACE_ITER_PRINTK_MSGONLY)
+		return print_printk_msg_only(iter);
 
 	if (trace_flags & TRACE_ITER_BIN)
 		return print_bin_fmt(iter);
@@ -1839,7 +2397,9 @@ static int s_show(struct seq_file *m, void *v)
 			seq_printf(m, "# tracer: %s\n", iter->trace->name);
 			seq_puts(m, "#\n");
 		}
-		if (iter->iter_flags & TRACE_FILE_LAT_FMT) {
+		if (iter->trace && iter->trace->print_header)
+			iter->trace->print_header(m);
+		else if (iter->iter_flags & TRACE_FILE_LAT_FMT) {
 			/* print nothing if the buffers are empty */
 			if (trace_empty(iter))
 				return 0;
@@ -1869,6 +2429,8 @@ static struct trace_iterator *
 __tracing_open(struct inode *inode, struct file *file, int *ret)
 {
 	struct trace_iterator *iter;
+	struct seq_file *m;
+	int cpu;
 
 	if (tracing_disabled) {
 		*ret = -ENODEV;
@@ -1889,28 +2451,49 @@ __tracing_open(struct inode *inode, struct file *file, int *ret)
 	iter->trace = current_trace;
 	iter->pos = -1;
 
+	/* Notify the tracer early; before we stop tracing. */
+	if (iter->trace && iter->trace->open)
+		iter->trace->open(iter);
+
+	/* Annotate start of buffers if we had overruns */
+	if (ring_buffer_overruns(iter->tr->buffer))
+		iter->iter_flags |= TRACE_FILE_ANNOTATE;
+
+
+	for_each_tracing_cpu(cpu) {
+
+		iter->buffer_iter[cpu] =
+			ring_buffer_read_start(iter->tr->buffer, cpu);
+
+		if (!iter->buffer_iter[cpu])
+			goto fail_buffer;
+	}
+
 	/* TODO stop tracer */
 	*ret = seq_open(file, &tracer_seq_ops);
-	if (!*ret) {
-		struct seq_file *m = file->private_data;
-		m->private = iter;
+	if (*ret)
+		goto fail_buffer;
 
-		/* stop the trace while dumping */
-		if (iter->tr->ctrl) {
-			tracer_enabled = 0;
-			ftrace_function_enabled = 0;
-		}
+	m = file->private_data;
+	m->private = iter;
+
+	/* stop the trace while dumping */
+	tracing_stop();
 
-		if (iter->trace && iter->trace->open)
-			iter->trace->open(iter);
-	} else {
-		kfree(iter);
-		iter = NULL;
-	}
 	mutex_unlock(&trace_types_lock);
 
  out:
 	return iter;
+
+ fail_buffer:
+	for_each_tracing_cpu(cpu) {
+		if (iter->buffer_iter[cpu])
+			ring_buffer_read_finish(iter->buffer_iter[cpu]);
+	}
+	mutex_unlock(&trace_types_lock);
+	kfree(iter);
+
+	return ERR_PTR(-ENOMEM);
 }
 
 int tracing_open_generic(struct inode *inode, struct file *filp)
@@ -1926,20 +2509,19 @@ int tracing_release(struct inode *inode, struct file *file)
 {
 	struct seq_file *m = (struct seq_file *)file->private_data;
 	struct trace_iterator *iter = m->private;
+	int cpu;
 
 	mutex_lock(&trace_types_lock);
+	for_each_tracing_cpu(cpu) {
+		if (iter->buffer_iter[cpu])
+			ring_buffer_read_finish(iter->buffer_iter[cpu]);
+	}
+
 	if (iter->trace && iter->trace->close)
 		iter->trace->close(iter);
 
 	/* reenable tracing if it was previously enabled */
-	if (iter->tr->ctrl) {
-		tracer_enabled = 1;
-		/*
-		 * It is safe to enable function tracing even if it
-		 * isn't used
-		 */
-		ftrace_function_enabled = 1;
-	}
+	tracing_start();
 	mutex_unlock(&trace_types_lock);
 
 	seq_release(inode, file);
@@ -2117,7 +2699,7 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf,
 	if (err)
 		goto err_unlock;
 
-	raw_local_irq_disable();
+	local_irq_disable();
 	__raw_spin_lock(&ftrace_max_lock);
 	for_each_tracing_cpu(cpu) {
 		/*
@@ -2134,7 +2716,7 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf,
 		}
 	}
 	__raw_spin_unlock(&ftrace_max_lock);
-	raw_local_irq_enable();
+	local_irq_enable();
 
 	tracing_cpumask = tracing_cpumask_new;
 
@@ -2155,13 +2737,16 @@ static struct file_operations tracing_cpumask_fops = {
 };
 
 static ssize_t
-tracing_iter_ctrl_read(struct file *filp, char __user *ubuf,
+tracing_trace_options_read(struct file *filp, char __user *ubuf,
 		       size_t cnt, loff_t *ppos)
 {
+	int i;
 	char *buf;
 	int r = 0;
 	int len = 0;
-	int i;
+	u32 tracer_flags = current_trace->flags->val;
+	struct tracer_opt *trace_opts = current_trace->flags->opts;
+
 
 	/* calulate max size */
 	for (i = 0; trace_options[i]; i++) {
@@ -2169,6 +2754,15 @@ tracing_iter_ctrl_read(struct file *filp, char __user *ubuf,
 		len += 3; /* "no" and space */
 	}
 
+	/*
+	 * Increase the size with names of options specific
+	 * of the current tracer.
+	 */
+	for (i = 0; trace_opts[i].name; i++) {
+		len += strlen(trace_opts[i].name);
+		len += 3; /* "no" and space */
+	}
+
 	/* +2 for \n and \0 */
 	buf = kmalloc(len + 2, GFP_KERNEL);
 	if (!buf)
@@ -2181,6 +2775,15 @@ tracing_iter_ctrl_read(struct file *filp, char __user *ubuf,
 			r += sprintf(buf + r, "no%s ", trace_options[i]);
 	}
 
+	for (i = 0; trace_opts[i].name; i++) {
+		if (tracer_flags & trace_opts[i].bit)
+			r += sprintf(buf + r, "%s ",
+				trace_opts[i].name);
+		else
+			r += sprintf(buf + r, "no%s ",
+				trace_opts[i].name);
+	}
+
 	r += sprintf(buf + r, "\n");
 	WARN_ON(r >= len + 2);
 
@@ -2191,13 +2794,48 @@ tracing_iter_ctrl_read(struct file *filp, char __user *ubuf,
 	return r;
 }
 
+/* Try to assign a tracer specific option */
+static int set_tracer_option(struct tracer *trace, char *cmp, int neg)
+{
+	struct tracer_flags *trace_flags = trace->flags;
+	struct tracer_opt *opts = NULL;
+	int ret = 0, i = 0;
+	int len;
+
+	for (i = 0; trace_flags->opts[i].name; i++) {
+		opts = &trace_flags->opts[i];
+		len = strlen(opts->name);
+
+		if (strncmp(cmp, opts->name, len) == 0) {
+			ret = trace->set_flag(trace_flags->val,
+				opts->bit, !neg);
+			break;
+		}
+	}
+	/* Not found */
+	if (!trace_flags->opts[i].name)
+		return -EINVAL;
+
+	/* Refused to handle */
+	if (ret)
+		return ret;
+
+	if (neg)
+		trace_flags->val &= ~opts->bit;
+	else
+		trace_flags->val |= opts->bit;
+
+	return 0;
+}
+
 static ssize_t
-tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf,
+tracing_trace_options_write(struct file *filp, const char __user *ubuf,
 			size_t cnt, loff_t *ppos)
 {
 	char buf[64];
 	char *cmp = buf;
 	int neg = 0;
+	int ret;
 	int i;
 
 	if (cnt >= sizeof(buf))
@@ -2224,11 +2862,13 @@ tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf,
 			break;
 		}
 	}
-	/*
-	 * If no option could be set, return an error:
-	 */
-	if (!trace_options[i])
-		return -EINVAL;
+
+	/* If no option could be set, test the specific tracer options */
+	if (!trace_options[i]) {
+		ret = set_tracer_option(current_trace, cmp, neg);
+		if (ret)
+			return ret;
+	}
 
 	filp->f_pos += cnt;
 
@@ -2237,8 +2877,8 @@ tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf,
 
 static struct file_operations tracing_iter_fops = {
 	.open		= tracing_open_generic,
-	.read		= tracing_iter_ctrl_read,
-	.write		= tracing_iter_ctrl_write,
+	.read		= tracing_trace_options_read,
+	.write		= tracing_trace_options_write,
 };
 
 static const char readme_msg[] =
@@ -2252,9 +2892,9 @@ static const char readme_msg[] =
 	"# echo sched_switch > /debug/tracing/current_tracer\n"
 	"# cat /debug/tracing/current_tracer\n"
 	"sched_switch\n"
-	"# cat /debug/tracing/iter_ctrl\n"
+	"# cat /debug/tracing/trace_options\n"
 	"noprint-parent nosym-offset nosym-addr noverbose\n"
-	"# echo print-parent > /debug/tracing/iter_ctrl\n"
+	"# echo print-parent > /debug/tracing/trace_options\n"
 	"# echo 1 > /debug/tracing/tracing_enabled\n"
 	"# cat /debug/tracing/trace > /tmp/trace.txt\n"
 	"echo 0 > /debug/tracing/tracing_enabled\n"
@@ -2277,11 +2917,10 @@ static ssize_t
 tracing_ctrl_read(struct file *filp, char __user *ubuf,
 		  size_t cnt, loff_t *ppos)
 {
-	struct trace_array *tr = filp->private_data;
 	char buf[64];
 	int r;
 
-	r = sprintf(buf, "%ld\n", tr->ctrl);
+	r = sprintf(buf, "%u\n", tracer_enabled);
 	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
 }
 
@@ -2309,16 +2948,18 @@ tracing_ctrl_write(struct file *filp, const char __user *ubuf,
 	val = !!val;
 
 	mutex_lock(&trace_types_lock);
-	if (tr->ctrl ^ val) {
-		if (val)
+	if (tracer_enabled ^ val) {
+		if (val) {
 			tracer_enabled = 1;
-		else
+			if (current_trace->start)
+				current_trace->start(tr);
+			tracing_start();
+		} else {
 			tracer_enabled = 0;
-
-		tr->ctrl = val;
-
-		if (current_trace && current_trace->ctrl_update)
-			current_trace->ctrl_update(tr);
+			tracing_stop();
+			if (current_trace->stop)
+				current_trace->stop(tr);
+		}
 	}
 	mutex_unlock(&trace_types_lock);
 
@@ -2344,14 +2985,52 @@ tracing_set_trace_read(struct file *filp, char __user *ubuf,
 	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
 }
 
+static int tracing_set_tracer(char *buf)
+{
+	struct trace_array *tr = &global_trace;
+	struct tracer *t;
+	int ret = 0;
+
+	mutex_lock(&trace_types_lock);
+	for (t = trace_types; t; t = t->next) {
+		if (strcmp(t->name, buf) == 0)
+			break;
+	}
+	if (!t) {
+		ret = -EINVAL;
+		goto out;
+	}
+	if (t == current_trace)
+		goto out;
+
+	trace_branch_disable();
+	if (current_trace && current_trace->reset)
+		current_trace->reset(tr);
+
+	current_trace = t;
+	if (t->init) {
+		ret = t->init(tr);
+		if (ret)
+			goto out;
+	}
+
+	trace_branch_enable(tr);
+ out:
+	mutex_unlock(&trace_types_lock);
+
+	return ret;
+}
+
 static ssize_t
 tracing_set_trace_write(struct file *filp, const char __user *ubuf,
 			size_t cnt, loff_t *ppos)
 {
-	struct trace_array *tr = &global_trace;
-	struct tracer *t;
 	char buf[max_tracer_type_len+1];
 	int i;
+	size_t ret;
+	int err;
+
+	ret = cnt;
 
 	if (cnt > max_tracer_type_len)
 		cnt = max_tracer_type_len;
@@ -2365,27 +3044,13 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
 	for (i = cnt - 1; i > 0 && isspace(buf[i]); i--)
 		buf[i] = 0;
 
-	mutex_lock(&trace_types_lock);
-	for (t = trace_types; t; t = t->next) {
-		if (strcmp(t->name, buf) == 0)
-			break;
-	}
-	if (!t || t == current_trace)
-		goto out;
-
-	if (current_trace && current_trace->reset)
-		current_trace->reset(tr);
-
-	current_trace = t;
-	if (t->init)
-		t->init(tr);
+	err = tracing_set_tracer(buf);
+	if (err)
+		return err;
 
- out:
-	mutex_unlock(&trace_types_lock);
+	filp->f_pos += ret;
 
-	filp->f_pos += cnt;
-
-	return cnt;
+	return ret;
 }
 
 static ssize_t
@@ -2450,6 +3115,10 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
 		return -ENOMEM;
 
 	mutex_lock(&trace_types_lock);
+
+	/* trace pipe does not show start of buffer */
+	cpus_setall(iter->started);
+
 	iter->tr = &global_trace;
 	iter->trace = current_trace;
 	filp->private_data = iter;
@@ -2500,20 +3169,12 @@ tracing_read_pipe(struct file *filp, char __user *ubuf,
 		  size_t cnt, loff_t *ppos)
 {
 	struct trace_iterator *iter = filp->private_data;
-	struct trace_array_cpu *data;
-	static cpumask_t mask;
-	unsigned long flags;
-#ifdef CONFIG_FTRACE
-	int ftrace_save;
-#endif
-	int cpu;
 	ssize_t sret;
 
 	/* return any leftover data */
 	sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
 	if (sret != -EBUSY)
 		return sret;
-	sret = 0;
 
 	trace_seq_reset(&iter->seq);
 
@@ -2524,6 +3185,8 @@ tracing_read_pipe(struct file *filp, char __user *ubuf,
 			goto out;
 	}
 
+waitagain:
+	sret = 0;
 	while (trace_empty(iter)) {
 
 		if ((filp->f_flags & O_NONBLOCK)) {
@@ -2588,46 +3251,12 @@ tracing_read_pipe(struct file *filp, char __user *ubuf,
 	       offsetof(struct trace_iterator, seq));
 	iter->pos = -1;
 
-	/*
-	 * We need to stop all tracing on all CPUS to read the
-	 * the next buffer. This is a bit expensive, but is
-	 * not done often. We fill all what we can read,
-	 * and then release the locks again.
-	 */
-
-	cpus_clear(mask);
-	local_irq_save(flags);
-#ifdef CONFIG_FTRACE
-	ftrace_save = ftrace_enabled;
-	ftrace_enabled = 0;
-#endif
-	smp_wmb();
-	for_each_tracing_cpu(cpu) {
-		data = iter->tr->data[cpu];
-
-		if (!head_page(data) || !data->trace_idx)
-			continue;
-
-		atomic_inc(&data->disabled);
-		cpu_set(cpu, mask);
-	}
-
-	for_each_cpu_mask(cpu, mask) {
-		data = iter->tr->data[cpu];
-		__raw_spin_lock(&data->lock);
-
-		if (data->overrun > iter->last_overrun[cpu])
-			iter->overrun[cpu] +=
-				data->overrun - iter->last_overrun[cpu];
-		iter->last_overrun[cpu] = data->overrun;
-	}
-
 	while (find_next_entry_inc(iter) != NULL) {
-		int ret;
+		enum print_line_t ret;
 		int len = iter->seq.len;
 
 		ret = print_trace_line(iter);
-		if (!ret) {
+		if (ret == TRACE_TYPE_PARTIAL_LINE) {
 			/* don't print partial lines */
 			iter->seq.len = len;
 			break;
@@ -2639,26 +3268,17 @@ tracing_read_pipe(struct file *filp, char __user *ubuf,
 			break;
 	}
 
-	for_each_cpu_mask(cpu, mask) {
-		data = iter->tr->data[cpu];
-		__raw_spin_unlock(&data->lock);
-	}
-
-	for_each_cpu_mask(cpu, mask) {
-		data = iter->tr->data[cpu];
-		atomic_dec(&data->disabled);
-	}
-#ifdef CONFIG_FTRACE
-	ftrace_enabled = ftrace_save;
-#endif
-	local_irq_restore(flags);
-
 	/* Now copy what we have to the user */
 	sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
 	if (iter->seq.readpos >= iter->seq.len)
 		trace_seq_reset(&iter->seq);
+
+	/*
+	 * If there was nothing to send to user, inspite of consuming trace
+	 * entries, go back to wait for more entries.
+	 */
 	if (sret == -EBUSY)
-		sret = 0;
+		goto waitagain;
 
 out:
 	mutex_unlock(&trace_types_lock);
@@ -2674,7 +3294,7 @@ tracing_entries_read(struct file *filp, char __user *ubuf,
 	char buf[64];
 	int r;
 
-	r = sprintf(buf, "%lu\n", tr->entries);
+	r = sprintf(buf, "%lu\n", tr->entries >> 10);
 	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
 }
 
@@ -2684,7 +3304,7 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
 {
 	unsigned long val;
 	char buf[64];
-	int i, ret;
+	int ret, cpu;
 
 	if (cnt >= sizeof(buf))
 		return -EINVAL;
@@ -2704,71 +3324,109 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
 
 	mutex_lock(&trace_types_lock);
 
-	if (current_trace != &no_tracer) {
-		cnt = -EBUSY;
-		pr_info("ftrace: set current_tracer to none"
-			" before modifying buffer size\n");
-		goto out;
-	}
-
-	if (val > global_trace.entries) {
-		long pages_requested;
-		unsigned long freeable_pages;
-
-		/* make sure we have enough memory before mapping */
-		pages_requested =
-			(val + (ENTRIES_PER_PAGE-1)) / ENTRIES_PER_PAGE;
-
-		/* account for each buffer (and max_tr) */
-		pages_requested *= tracing_nr_buffers * 2;
+	tracing_stop();
 
-		/* Check for overflow */
-		if (pages_requested < 0) {
-			cnt = -ENOMEM;
-			goto out;
-		}
+	/* disable all cpu buffers */
+	for_each_tracing_cpu(cpu) {
+		if (global_trace.data[cpu])
+			atomic_inc(&global_trace.data[cpu]->disabled);
+		if (max_tr.data[cpu])
+			atomic_inc(&max_tr.data[cpu]->disabled);
+	}
 
-		freeable_pages = determine_dirtyable_memory();
+	/* value is in KB */
+	val <<= 10;
 
-		/* we only allow to request 1/4 of useable memory */
-		if (pages_requested >
-		    ((freeable_pages + tracing_pages_allocated) / 4)) {
-			cnt = -ENOMEM;
+	if (val != global_trace.entries) {
+		ret = ring_buffer_resize(global_trace.buffer, val);
+		if (ret < 0) {
+			cnt = ret;
 			goto out;
 		}
 
-		while (global_trace.entries < val) {
-			if (trace_alloc_page()) {
-				cnt = -ENOMEM;
-				goto out;
+		ret = ring_buffer_resize(max_tr.buffer, val);
+		if (ret < 0) {
+			int r;
+			cnt = ret;
+			r = ring_buffer_resize(global_trace.buffer,
+					       global_trace.entries);
+			if (r < 0) {
+				/* AARGH! We are left with different
+				 * size max buffer!!!! */
+				WARN_ON(1);
+				tracing_disabled = 1;
 			}
-			/* double check that we don't go over the known pages */
-			if (tracing_pages_allocated > pages_requested)
-				break;
+			goto out;
 		}
 
-	} else {
-		/* include the number of entries in val (inc of page entries) */
-		while (global_trace.entries > val + (ENTRIES_PER_PAGE - 1))
-			trace_free_page();
+		global_trace.entries = val;
 	}
 
-	/* check integrity */
-	for_each_tracing_cpu(i)
-		check_pages(global_trace.data[i]);
-
 	filp->f_pos += cnt;
 
 	/* If check pages failed, return ENOMEM */
 	if (tracing_disabled)
 		cnt = -ENOMEM;
  out:
+	for_each_tracing_cpu(cpu) {
+		if (global_trace.data[cpu])
+			atomic_dec(&global_trace.data[cpu]->disabled);
+		if (max_tr.data[cpu])
+			atomic_dec(&max_tr.data[cpu]->disabled);
+	}
+
+	tracing_start();
 	max_tr.entries = global_trace.entries;
 	mutex_unlock(&trace_types_lock);
 
 	return cnt;
 }
 
+static int mark_printk(const char *fmt, ...)
+{
+	int ret;
+	va_list args;
+	va_start(args, fmt);
+	ret = trace_vprintk(0, -1, fmt, args);
+	va_end(args);
+	return ret;
+}
+
+static ssize_t
+tracing_mark_write(struct file *filp, const char __user *ubuf,
+					size_t cnt, loff_t *fpos)
+{
+	char *buf;
+	char *end;
+
+	if (tracing_disabled)
+		return -EINVAL;
+
+	if (cnt > TRACE_BUF_SIZE)
+		cnt = TRACE_BUF_SIZE;
+
+	buf = kmalloc(cnt + 1, GFP_KERNEL);
+	if (buf == NULL)
+		return -ENOMEM;
+
+	if (copy_from_user(buf, ubuf, cnt)) {
+		kfree(buf);
+		return -EFAULT;
+	}
+
+	/* Cut from the first nil or newline. */
+	buf[cnt] = '\0';
+	end = strchr(buf, '\n');
+	if (end)
+		*end = '\0';
+
+	cnt = mark_printk("%s\n", buf);
+	kfree(buf);
+	*fpos += cnt;
+
+	return cnt;
+}
+
 static struct file_operations tracing_max_lat_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_max_lat_read,
@@ -2800,24 +3458,45 @@ static struct file_operations tracing_entries_fops = {
 	.write		= tracing_entries_write,
 };
 
+static struct file_operations tracing_mark_fops = {
+	.open		= tracing_open_generic,
+	.write		= tracing_mark_write,
+};
+
 #ifdef CONFIG_DYNAMIC_FTRACE
 
+int __weak ftrace_arch_read_dyn_info(char *buf, int size)
+{
+	return 0;
+}
+
 static ssize_t
-tracing_read_long(struct file *filp, char __user *ubuf,
+tracing_read_dyn_info(struct file *filp, char __user *ubuf,
 		  size_t cnt, loff_t *ppos)
 {
+	static char ftrace_dyn_info_buffer[1024];
+	static DEFINE_MUTEX(dyn_info_mutex);
 	unsigned long *p = filp->private_data;
-	char buf[64];
+	char *buf = ftrace_dyn_info_buffer;
+	int size = ARRAY_SIZE(ftrace_dyn_info_buffer);
 	int r;
 
-	r = sprintf(buf, "%ld\n", *p);
+	mutex_lock(&dyn_info_mutex);
+	r = sprintf(buf, "%ld ", *p);
 
-	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+	r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r);
+	buf[r++] = '\n';
+
+	r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+
+	mutex_unlock(&dyn_info_mutex);
+
+	return r;
 }
 
-static struct file_operations tracing_read_long_fops = {
+static struct file_operations tracing_dyn_info_fops = {
 	.open		= tracing_open_generic,
-	.read		= tracing_read_long,
+	.read		= tracing_read_dyn_info,
 };
 #endif
 
@@ -2846,7 +3525,7 @@ struct dentry *tracing_init_dentry(void)
 #include "trace_selftest.c"
 #endif
 
-static __init void tracer_init_debugfs(void)
+static __init int tracer_init_debugfs(void)
 {
 	struct dentry *d_tracer;
 	struct dentry *entry;
@@ -2858,10 +3537,10 @@ static __init void tracer_init_debugfs(void)
 	if (!entry)
 		pr_warning("Could not create debugfs 'tracing_enabled' entry\n");
 
-	entry = debugfs_create_file("iter_ctrl", 0644, d_tracer,
+	entry = debugfs_create_file("trace_options", 0644, d_tracer,
 				    NULL, &tracing_iter_fops);
 	if (!entry)
-		pr_warning("Could not create debugfs 'iter_ctrl' entry\n");
+		pr_warning("Could not create debugfs 'trace_options' entry\n");
 
 	entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer,
 				    NULL, &tracing_cpumask_fops);
@@ -2881,12 +3560,12 @@ static __init void tracer_init_debugfs(void)
 	entry = debugfs_create_file("available_tracers", 0444, d_tracer,
 				    &global_trace, &show_traces_fops);
 	if (!entry)
-		pr_warning("Could not create debugfs 'trace' entry\n");
+		pr_warning("Could not create debugfs 'available_tracers' entry\n");
 
 	entry = debugfs_create_file("current_tracer", 0444, d_tracer,
 				    &global_trace, &set_tracer_fops);
 	if (!entry)
-		pr_warning("Could not create debugfs 'trace' entry\n");
+		pr_warning("Could not create debugfs 'current_tracer' entry\n");
 
 	entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer,
 				    &tracing_max_latency,
@@ -2899,7 +3578,7 @@ static __init void tracer_init_debugfs(void)
 				    &tracing_thresh, &tracing_max_lat_fops);
 	if (!entry)
 		pr_warning("Could not create debugfs "
-			   "'tracing_threash' entry\n");
+			   "'tracing_thresh' entry\n");
 	entry = debugfs_create_file("README", 0644, d_tracer,
 				    NULL, &tracing_readme_fops);
 	if (!entry)
@@ -2909,18 +3588,24 @@ static __init void tracer_init_debugfs(void)
 				    NULL, &tracing_pipe_fops);
 	if (!entry)
 		pr_warning("Could not create debugfs "
-			   "'tracing_threash' entry\n");
+			   "'trace_pipe' entry\n");
 
-	entry = debugfs_create_file("trace_entries", 0644, d_tracer,
+	entry = debugfs_create_file("buffer_size_kb", 0644, d_tracer,
 				    &global_trace, &tracing_entries_fops);
 	if (!entry)
 		pr_warning("Could not create debugfs "
-			   "'tracing_threash' entry\n");
+			   "'buffer_size_kb' entry\n");
+
+	entry = debugfs_create_file("trace_marker", 0220, d_tracer,
+				    NULL, &tracing_mark_fops);
+	if (!entry)
+		pr_warning("Could not create debugfs "
+			   "'trace_marker' entry\n");
 
 #ifdef CONFIG_DYNAMIC_FTRACE
 	entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer,
 				    &ftrace_update_tot_cnt,
-				    &tracing_read_long_fops);
+				    &tracing_dyn_info_fops);
 	if (!entry)
 		pr_warning("Could not create debugfs "
 			   "'dyn_ftrace_total_info' entry\n");
@@ -2928,230 +3613,268 @@ static __init void tracer_init_debugfs(void)
 #ifdef CONFIG_SYSPROF_TRACER
 	init_tracer_sysprof_debugfs(d_tracer);
 #endif
+	return 0;
 }
 
-static int trace_alloc_page(void)
+int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args)
 {
+	static DEFINE_SPINLOCK(trace_buf_lock);
+	static char trace_buf[TRACE_BUF_SIZE];
+
+	struct ring_buffer_event *event;
+	struct trace_array *tr = &global_trace;
 	struct trace_array_cpu *data;
-	struct page *page, *tmp;
-	LIST_HEAD(pages);
-	void *array;
-	unsigned pages_allocated = 0;
-	int i;
+	int cpu, len = 0, size, pc;
+	struct print_entry *entry;
+	unsigned long irq_flags;
 
-	/* first allocate a page for each CPU */
-	for_each_tracing_cpu(i) {
-		array = (void *)__get_free_page(GFP_KERNEL);
-		if (array == NULL) {
-			printk(KERN_ERR "tracer: failed to allocate page"
-			       "for trace buffer!\n");
-			goto free_pages;
-		}
+	if (tracing_disabled || tracing_selftest_running)
+		return 0;
 
-		pages_allocated++;
-		page = virt_to_page(array);
-		list_add(&page->lru, &pages);
+	pc = preempt_count();
+	preempt_disable_notrace();
+	cpu = raw_smp_processor_id();
+	data = tr->data[cpu];
 
-/* Only allocate if we are actually using the max trace */
-#ifdef CONFIG_TRACER_MAX_TRACE
-		array = (void *)__get_free_page(GFP_KERNEL);
-		if (array == NULL) {
-			printk(KERN_ERR "tracer: failed to allocate page"
-			       "for trace buffer!\n");
-			goto free_pages;
-		}
-		pages_allocated++;
-		page = virt_to_page(array);
-		list_add(&page->lru, &pages);
-#endif
-	}
+	if (unlikely(atomic_read(&data->disabled)))
+		goto out;
 
-	/* Now that we successfully allocate a page per CPU, add them */
-	for_each_tracing_cpu(i) {
-		data = global_trace.data[i];
-		page = list_entry(pages.next, struct page, lru);
-		list_del_init(&page->lru);
-		list_add_tail(&page->lru, &data->trace_pages);
-		ClearPageLRU(page);
+	pause_graph_tracing();
+	spin_lock_irqsave(&trace_buf_lock, irq_flags);
+	len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
+
+	len = min(len, TRACE_BUF_SIZE-1);
+	trace_buf[len] = 0;
+
+	size = sizeof(*entry) + len + 1;
+	event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags);
+	if (!event)
+		goto out_unlock;
+	entry = ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, irq_flags, pc);
+	entry->ent.type			= TRACE_PRINT;
+	entry->ip			= ip;
+	entry->depth			= depth;
+
+	memcpy(&entry->buf, trace_buf, len);
+	entry->buf[len] = 0;
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+ out_unlock:
+	spin_unlock_irqrestore(&trace_buf_lock, irq_flags);
+	unpause_graph_tracing();
+ out:
+	preempt_enable_notrace();
 
-#ifdef CONFIG_TRACER_MAX_TRACE
-		data = max_tr.data[i];
-		page = list_entry(pages.next, struct page, lru);
-		list_del_init(&page->lru);
-		list_add_tail(&page->lru, &data->trace_pages);
-		SetPageLRU(page);
-#endif
-	}
-	tracing_pages_allocated += pages_allocated;
-	global_trace.entries += ENTRIES_PER_PAGE;
+	return len;
+}
+EXPORT_SYMBOL_GPL(trace_vprintk);
 
-	return 0;
+int __ftrace_printk(unsigned long ip, const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
 
- free_pages:
-	list_for_each_entry_safe(page, tmp, &pages, lru) {
-		list_del_init(&page->lru);
-		__free_page(page);
+	if (!(trace_flags & TRACE_ITER_PRINTK))
+		return 0;
+
+	va_start(ap, fmt);
+	ret = trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap);
+	va_end(ap);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(__ftrace_printk);
+
+static int trace_panic_handler(struct notifier_block *this,
+			       unsigned long event, void *unused)
+{
+	if (ftrace_dump_on_oops)
+		ftrace_dump();
+	return NOTIFY_OK;
+}
+
+static struct notifier_block trace_panic_notifier = {
+	.notifier_call  = trace_panic_handler,
+	.next           = NULL,
+	.priority       = 150   /* priority: INT_MAX >= x >= 0 */
+};
+
+static int trace_die_handler(struct notifier_block *self,
+			     unsigned long val,
+			     void *data)
+{
+	switch (val) {
+	case DIE_OOPS:
+		if (ftrace_dump_on_oops)
+			ftrace_dump();
+		break;
+	default:
+		break;
 	}
-	return -ENOMEM;
+	return NOTIFY_OK;
+}
+
+static struct notifier_block trace_die_notifier = {
+	.notifier_call = trace_die_handler,
+	.priority = 200
+};
+
+/*
+ * printk is set to max of 1024, we really don't need it that big.
+ * Nothing should be printing 1000 characters anyway.
+ */
+#define TRACE_MAX_PRINT		1000
+
+/*
+ * Define here KERN_TRACE so that we have one place to modify
+ * it if we decide to change what log level the ftrace dump
+ * should be at.
+ */
+#define KERN_TRACE		KERN_INFO
+
+static void
+trace_printk_seq(struct trace_seq *s)
+{
+	/* Probably should print a warning here. */
+	if (s->len >= 1000)
+		s->len = 1000;
+
+	/* should be zero ended, but we are paranoid. */
+	s->buffer[s->len] = 0;
+
+	printk(KERN_TRACE "%s", s->buffer);
+
+	trace_seq_reset(s);
 }
 
-static int trace_free_page(void)
+void ftrace_dump(void)
 {
-	struct trace_array_cpu *data;
-	struct page *page;
-	struct list_head *p;
-	int i;
-	int ret = 0;
+	static DEFINE_SPINLOCK(ftrace_dump_lock);
+	/* use static because iter can be a bit big for the stack */
+	static struct trace_iterator iter;
+	static cpumask_t mask;
+	static int dump_ran;
+	unsigned long flags;
+	int cnt = 0, cpu;
 
-	/* free one page from each buffer */
-	for_each_tracing_cpu(i) {
-		data = global_trace.data[i];
-		p = data->trace_pages.next;
-		if (p == &data->trace_pages) {
-			/* should never happen */
-			WARN_ON(1);
-			tracing_disabled = 1;
-			ret = -1;
-			break;
-		}
-		page = list_entry(p, struct page, lru);
-		ClearPageLRU(page);
-		list_del(&page->lru);
-		tracing_pages_allocated--;
-		tracing_pages_allocated--;
-		__free_page(page);
+	/* only one dump */
+	spin_lock_irqsave(&ftrace_dump_lock, flags);
+	if (dump_ran)
+		goto out;
 
-		tracing_reset(data);
+	dump_ran = 1;
 
-#ifdef CONFIG_TRACER_MAX_TRACE
-		data = max_tr.data[i];
-		p = data->trace_pages.next;
-		if (p == &data->trace_pages) {
-			/* should never happen */
-			WARN_ON(1);
-			tracing_disabled = 1;
-			ret = -1;
-			break;
+	/* No turning back! */
+	ftrace_kill();
+
+	for_each_tracing_cpu(cpu) {
+		atomic_inc(&global_trace.data[cpu]->disabled);
+	}
+
+	/* don't look at user memory in panic mode */
+	trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
+
+	printk(KERN_TRACE "Dumping ftrace buffer:\n");
+
+	iter.tr = &global_trace;
+	iter.trace = current_trace;
+
+	/*
+	 * We need to stop all tracing on all CPUS to read the
+	 * the next buffer. This is a bit expensive, but is
+	 * not done often. We fill all what we can read,
+	 * and then release the locks again.
+	 */
+
+	cpus_clear(mask);
+
+	while (!trace_empty(&iter)) {
+
+		if (!cnt)
+			printk(KERN_TRACE "---------------------------------\n");
+
+		cnt++;
+
+		/* reset all but tr, trace, and overruns */
+		memset(&iter.seq, 0,
+		       sizeof(struct trace_iterator) -
+		       offsetof(struct trace_iterator, seq));
+		iter.iter_flags |= TRACE_FILE_LAT_FMT;
+		iter.pos = -1;
+
+		if (find_next_entry_inc(&iter) != NULL) {
+			print_trace_line(&iter);
+			trace_consume(&iter);
 		}
-		page = list_entry(p, struct page, lru);
-		ClearPageLRU(page);
-		list_del(&page->lru);
-		__free_page(page);
 
-		tracing_reset(data);
-#endif
+		trace_printk_seq(&iter.seq);
 	}
-	global_trace.entries -= ENTRIES_PER_PAGE;
 
-	return ret;
+	if (!cnt)
+		printk(KERN_TRACE "   (ftrace buffer empty)\n");
+	else
+		printk(KERN_TRACE "---------------------------------\n");
+
+ out:
+	spin_unlock_irqrestore(&ftrace_dump_lock, flags);
 }
 
 __init static int tracer_alloc_buffers(void)
 {
 	struct trace_array_cpu *data;
-	void *array;
-	struct page *page;
-	int pages = 0;
-	int ret = -ENOMEM;
 	int i;
 
 	/* TODO: make the number of buffers hot pluggable with CPUS */
-	tracing_nr_buffers = num_possible_cpus();
 	tracing_buffer_mask = cpu_possible_map;
 
-	/* Allocate the first page for all buffers */
-	for_each_tracing_cpu(i) {
-		data = global_trace.data[i] = &per_cpu(global_trace_cpu, i);
-		max_tr.data[i] = &per_cpu(max_data, i);
-
-		array = (void *)__get_free_page(GFP_KERNEL);
-		if (array == NULL) {
-			printk(KERN_ERR "tracer: failed to allocate page"
-			       "for trace buffer!\n");
-			goto free_buffers;
-		}
-
-		/* set the array to the list */
-		INIT_LIST_HEAD(&data->trace_pages);
-		page = virt_to_page(array);
-		list_add(&page->lru, &data->trace_pages);
-		/* use the LRU flag to differentiate the two buffers */
-		ClearPageLRU(page);
-
-		data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
-		max_tr.data[i]->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
+	global_trace.buffer = ring_buffer_alloc(trace_buf_size,
+						   TRACE_BUFFER_FLAGS);
+	if (!global_trace.buffer) {
+		printk(KERN_ERR "tracer: failed to allocate ring buffer!\n");
+		WARN_ON(1);
+		return 0;
+	}
+	global_trace.entries = ring_buffer_size(global_trace.buffer);
 
-/* Only allocate if we are actually using the max trace */
 #ifdef CONFIG_TRACER_MAX_TRACE
-		array = (void *)__get_free_page(GFP_KERNEL);
-		if (array == NULL) {
-			printk(KERN_ERR "tracer: failed to allocate page"
-			       "for trace buffer!\n");
-			goto free_buffers;
-		}
-
-		INIT_LIST_HEAD(&max_tr.data[i]->trace_pages);
-		page = virt_to_page(array);
-		list_add(&page->lru, &max_tr.data[i]->trace_pages);
-		SetPageLRU(page);
-#endif
+	max_tr.buffer = ring_buffer_alloc(trace_buf_size,
+					     TRACE_BUFFER_FLAGS);
+	if (!max_tr.buffer) {
+		printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n");
+		WARN_ON(1);
+		ring_buffer_free(global_trace.buffer);
+		return 0;
 	}
+	max_tr.entries = ring_buffer_size(max_tr.buffer);
+	WARN_ON(max_tr.entries != global_trace.entries);
+#endif
 
-	/*
-	 * Since we allocate by orders of pages, we may be able to
-	 * round up a bit.
-	 */
-	global_trace.entries = ENTRIES_PER_PAGE;
-	pages++;
-
-	while (global_trace.entries < trace_nr_entries) {
-		if (trace_alloc_page())
-			break;
-		pages++;
+	/* Allocate the first page for all buffers */
+	for_each_tracing_cpu(i) {
+		data = global_trace.data[i] = &per_cpu(global_trace_cpu, i);
+		max_tr.data[i] = &per_cpu(max_data, i);
 	}
-	max_tr.entries = global_trace.entries;
-
-	pr_info("tracer: %d pages allocated for %ld entries of %ld bytes\n",
-		pages, trace_nr_entries, (long)TRACE_ENTRY_SIZE);
-	pr_info("   actual entries %ld\n", global_trace.entries);
-
-	tracer_init_debugfs();
 
 	trace_init_cmdlines();
 
-	register_tracer(&no_tracer);
-	current_trace = &no_tracer;
+	register_tracer(&nop_trace);
+#ifdef CONFIG_BOOT_TRACER
+	register_tracer(&boot_tracer);
+	current_trace = &boot_tracer;
+	current_trace->init(&global_trace);
+#else
+	current_trace = &nop_trace;
+#endif
 
 	/* All seems OK, enable tracing */
-	global_trace.ctrl = tracer_enabled;
 	tracing_disabled = 0;
 
-	return 0;
+	atomic_notifier_chain_register(&panic_notifier_list,
+				       &trace_panic_notifier);
 
- free_buffers:
-	for (i-- ; i >= 0; i--) {
-		struct page *page, *tmp;
-		struct trace_array_cpu *data = global_trace.data[i];
-
-		if (data) {
-			list_for_each_entry_safe(page, tmp,
-						 &data->trace_pages, lru) {
-				list_del_init(&page->lru);
-				__free_page(page);
-			}
-		}
+	register_die_notifier(&trace_die_notifier);
 
-#ifdef CONFIG_TRACER_MAX_TRACE
-		data = max_tr.data[i];
-		if (data) {
-			list_for_each_entry_safe(page, tmp,
-						 &data->trace_pages, lru) {
-				list_del_init(&page->lru);
-				__free_page(page);
-			}
-		}
-#endif
-	}
-	return ret;
+	return 0;
 }
-fs_initcall(tracer_alloc_buffers);
+early_initcall(tracer_alloc_buffers);
+fs_initcall(tracer_init_debugfs);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index f69f86788c2b..cc7a4f864036 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -5,7 +5,10 @@
 #include <asm/atomic.h>
 #include <linux/sched.h>
 #include <linux/clocksource.h>
+#include <linux/ring_buffer.h>
 #include <linux/mmiotrace.h>
+#include <linux/ftrace.h>
+#include <trace/boot.h>
 
 enum trace_type {
 	__TRACE_FIRST_TYPE = 0,
@@ -13,38 +16,80 @@ enum trace_type {
 	TRACE_FN,
 	TRACE_CTX,
 	TRACE_WAKE,
+	TRACE_CONT,
 	TRACE_STACK,
+	TRACE_PRINT,
 	TRACE_SPECIAL,
 	TRACE_MMIO_RW,
 	TRACE_MMIO_MAP,
+	TRACE_BRANCH,
+	TRACE_BOOT_CALL,
+	TRACE_BOOT_RET,
+	TRACE_GRAPH_RET,
+	TRACE_GRAPH_ENT,
+	TRACE_USER_STACK,
+	TRACE_HW_BRANCHES,
+	TRACE_POWER,
 
 	__TRACE_LAST_TYPE
 };
 
 /*
+ * The trace entry - the most basic unit of tracing. This is what
+ * is printed in the end as a single line in the trace output, such as:
+ *
+ *     bash-15816 [01]   235.197585: idle_cpu <- irq_enter
+ */
+struct trace_entry {
+	unsigned char		type;
+	unsigned char		cpu;
+	unsigned char		flags;
+	unsigned char		preempt_count;
+	int			pid;
+	int			tgid;
+};
+
+/*
  * Function trace entry - function address and parent function addres:
  */
 struct ftrace_entry {
+	struct trace_entry	ent;
 	unsigned long		ip;
 	unsigned long		parent_ip;
 };
 
+/* Function call entry */
+struct ftrace_graph_ent_entry {
+	struct trace_entry			ent;
+	struct ftrace_graph_ent		graph_ent;
+};
+
+/* Function return entry */
+struct ftrace_graph_ret_entry {
+	struct trace_entry			ent;
+	struct ftrace_graph_ret		ret;
+};
+extern struct tracer boot_tracer;
+
 /*
  * Context switch trace entry - which task (and prio) we switched from/to:
  */
 struct ctx_switch_entry {
+	struct trace_entry	ent;
 	unsigned int		prev_pid;
 	unsigned char		prev_prio;
 	unsigned char		prev_state;
 	unsigned int		next_pid;
 	unsigned char		next_prio;
 	unsigned char		next_state;
+	unsigned int		next_cpu;
 };
 
 /*
  * Special (free-form) trace entry:
  */
 struct special_entry {
+	struct trace_entry	ent;
 	unsigned long		arg1;
 	unsigned long		arg2;
 	unsigned long		arg3;
@@ -57,33 +102,94 @@ struct special_entry {
 #define FTRACE_STACK_ENTRIES	8
 
 struct stack_entry {
+	struct trace_entry	ent;
+	unsigned long		caller[FTRACE_STACK_ENTRIES];
+};
+
+struct userstack_entry {
+	struct trace_entry	ent;
 	unsigned long		caller[FTRACE_STACK_ENTRIES];
 };
 
 /*
- * The trace entry - the most basic unit of tracing. This is what
- * is printed in the end as a single line in the trace output, such as:
- *
- *     bash-15816 [01]   235.197585: idle_cpu <- irq_enter
+ * ftrace_printk entry:
  */
-struct trace_entry {
-	char			type;
-	char			cpu;
-	char			flags;
-	char			preempt_count;
-	int			pid;
-	cycle_t			t;
-	union {
-		struct ftrace_entry		fn;
-		struct ctx_switch_entry		ctx;
-		struct special_entry		special;
-		struct stack_entry		stack;
-		struct mmiotrace_rw		mmiorw;
-		struct mmiotrace_map		mmiomap;
-	};
+struct print_entry {
+	struct trace_entry	ent;
+	unsigned long		ip;
+	int			depth;
+	char			buf[];
+};
+
+#define TRACE_OLD_SIZE		88
+
+struct trace_field_cont {
+	unsigned char		type;
+	/* Temporary till we get rid of this completely */
+	char			buf[TRACE_OLD_SIZE - 1];
 };
 
-#define TRACE_ENTRY_SIZE	sizeof(struct trace_entry)
+struct trace_mmiotrace_rw {
+	struct trace_entry	ent;
+	struct mmiotrace_rw	rw;
+};
+
+struct trace_mmiotrace_map {
+	struct trace_entry	ent;
+	struct mmiotrace_map	map;
+};
+
+struct trace_boot_call {
+	struct trace_entry	ent;
+	struct boot_trace_call boot_call;
+};
+
+struct trace_boot_ret {
+	struct trace_entry	ent;
+	struct boot_trace_ret boot_ret;
+};
+
+#define TRACE_FUNC_SIZE 30
+#define TRACE_FILE_SIZE 20
+struct trace_branch {
+	struct trace_entry	ent;
+	unsigned	        line;
+	char			func[TRACE_FUNC_SIZE+1];
+	char			file[TRACE_FILE_SIZE+1];
+	char			correct;
+};
+
+struct hw_branch_entry {
+	struct trace_entry	ent;
+	u64			from;
+	u64			to;
+};
+
+struct trace_power {
+	struct trace_entry	ent;
+	struct power_trace	state_data;
+};
+
+/*
+ * trace_flag_type is an enumeration that holds different
+ * states when a trace occurs. These are:
+ *  IRQS_OFF		- interrupts were disabled
+ *  IRQS_NOSUPPORT 	- arch does not support irqs_disabled_flags
+ *  NEED_RESCED		- reschedule is requested
+ *  HARDIRQ		- inside an interrupt handler
+ *  SOFTIRQ		- inside a softirq handler
+ *  CONT		- multiple entries hold the trace item
+ */
+enum trace_flag_type {
+	TRACE_FLAG_IRQS_OFF		= 0x01,
+	TRACE_FLAG_IRQS_NOSUPPORT	= 0x02,
+	TRACE_FLAG_NEED_RESCHED		= 0x04,
+	TRACE_FLAG_HARDIRQ		= 0x08,
+	TRACE_FLAG_SOFTIRQ		= 0x10,
+	TRACE_FLAG_CONT			= 0x20,
+};
+
+#define TRACE_BUF_SIZE		1024
 
 /*
  * The CPU trace array - it consists of thousands of trace entries
@@ -91,16 +197,9 @@ struct trace_entry {
  * the trace, etc.)
  */
 struct trace_array_cpu {
-	struct list_head	trace_pages;
 	atomic_t		disabled;
-	raw_spinlock_t		lock;
-	struct lock_class_key	lock_key;
 
 	/* these fields get copied into max-trace: */
-	unsigned		trace_head_idx;
-	unsigned		trace_tail_idx;
-	void			*trace_head; /* producer */
-	void			*trace_tail; /* consumer */
 	unsigned long		trace_idx;
 	unsigned long		overrun;
 	unsigned long		saved_latency;
@@ -124,37 +223,123 @@ struct trace_iterator;
  * They have on/off state as well:
  */
 struct trace_array {
+	struct ring_buffer	*buffer;
 	unsigned long		entries;
-	long			ctrl;
 	int			cpu;
 	cycle_t			time_start;
 	struct task_struct	*waiter;
 	struct trace_array_cpu	*data[NR_CPUS];
 };
 
+#define FTRACE_CMP_TYPE(var, type) \
+	__builtin_types_compatible_p(typeof(var), type *)
+
+#undef IF_ASSIGN
+#define IF_ASSIGN(var, entry, etype, id)		\
+	if (FTRACE_CMP_TYPE(var, etype)) {		\
+		var = (typeof(var))(entry);		\
+		WARN_ON(id && (entry)->type != id);	\
+		break;					\
+	}
+
+/* Will cause compile errors if type is not found. */
+extern void __ftrace_bad_type(void);
+
+/*
+ * The trace_assign_type is a verifier that the entry type is
+ * the same as the type being assigned. To add new types simply
+ * add a line with the following format:
+ *
+ * IF_ASSIGN(var, ent, type, id);
+ *
+ *  Where "type" is the trace type that includes the trace_entry
+ *  as the "ent" item. And "id" is the trace identifier that is
+ *  used in the trace_type enum.
+ *
+ *  If the type can have more than one id, then use zero.
+ */
+#define trace_assign_type(var, ent)					\
+	do {								\
+		IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);	\
+		IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);	\
+		IF_ASSIGN(var, ent, struct trace_field_cont, TRACE_CONT); \
+		IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);	\
+		IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
+		IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);	\
+		IF_ASSIGN(var, ent, struct special_entry, 0);		\
+		IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,		\
+			  TRACE_MMIO_RW);				\
+		IF_ASSIGN(var, ent, struct trace_mmiotrace_map,		\
+			  TRACE_MMIO_MAP);				\
+		IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
+		IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
+		IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
+		IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,	\
+			  TRACE_GRAPH_ENT);		\
+		IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,	\
+			  TRACE_GRAPH_RET);		\
+		IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
+ 		IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
+		__ftrace_bad_type();					\
+	} while (0)
+
+/* Return values for print_line callback */
+enum print_line_t {
+	TRACE_TYPE_PARTIAL_LINE	= 0,	/* Retry after flushing the seq */
+	TRACE_TYPE_HANDLED	= 1,
+	TRACE_TYPE_UNHANDLED	= 2	/* Relay to other output functions */
+};
+
+
+/*
+ * An option specific to a tracer. This is a boolean value.
+ * The bit is the bit index that sets its value on the
+ * flags value in struct tracer_flags.
+ */
+struct tracer_opt {
+	const char 	*name; /* Will appear on the trace_options file */
+	u32 		bit; /* Mask assigned in val field in tracer_flags */
+};
+
+/*
+ * The set of specific options for a tracer. Your tracer
+ * have to set the initial value of the flags val.
+ */
+struct tracer_flags {
+	u32			val;
+	struct tracer_opt 	*opts;
+};
+
+/* Makes more easy to define a tracer opt */
+#define TRACER_OPT(s, b)	.name = #s, .bit = b
+
 /*
  * A specific tracer, represented by methods that operate on a trace array:
  */
 struct tracer {
 	const char		*name;
-	void			(*init)(struct trace_array *tr);
+	/* Your tracer should raise a warning if init fails */
+	int			(*init)(struct trace_array *tr);
 	void			(*reset)(struct trace_array *tr);
+	void			(*start)(struct trace_array *tr);
+	void			(*stop)(struct trace_array *tr);
 	void			(*open)(struct trace_iterator *iter);
 	void			(*pipe_open)(struct trace_iterator *iter);
 	void			(*close)(struct trace_iterator *iter);
-	void			(*start)(struct trace_iterator *iter);
-	void			(*stop)(struct trace_iterator *iter);
 	ssize_t			(*read)(struct trace_iterator *iter,
 					struct file *filp, char __user *ubuf,
 					size_t cnt, loff_t *ppos);
-	void			(*ctrl_update)(struct trace_array *tr);
 #ifdef CONFIG_FTRACE_STARTUP_TEST
 	int			(*selftest)(struct tracer *trace,
 					    struct trace_array *tr);
 #endif
-	int			(*print_line)(struct trace_iterator *iter);
+	void			(*print_header)(struct seq_file *m);
+	enum print_line_t	(*print_line)(struct trace_iterator *iter);
+	/* If you handled the flag setting, return 0 */
+	int			(*set_flag)(u32 old_flags, u32 bit, int set);
 	struct tracer		*next;
 	int			print_max;
+	struct tracer_flags 	*flags;
 };
 
 struct trace_seq {
@@ -171,60 +356,72 @@ struct trace_iterator {
 	struct trace_array	*tr;
 	struct tracer		*trace;
 	void			*private;
-	long			last_overrun[NR_CPUS];
-	long			overrun[NR_CPUS];
+	struct ring_buffer_iter	*buffer_iter[NR_CPUS];
 
 	/* The below is zeroed out in pipe_read */
 	struct trace_seq	seq;
 	struct trace_entry	*ent;
 	int			cpu;
-
-	struct trace_entry	*prev_ent;
-	int			prev_cpu;
+	u64			ts;
 
 	unsigned long		iter_flags;
 	loff_t			pos;
-	unsigned long		next_idx[NR_CPUS];
-	struct list_head	*next_page[NR_CPUS];
-	unsigned		next_page_idx[NR_CPUS];
 	long			idx;
+
+	cpumask_t		started;
 };
 
-void tracing_reset(struct trace_array_cpu *data);
+int tracing_is_enabled(void);
+void trace_wake_up(void);
+void tracing_reset(struct trace_array *tr, int cpu);
+void tracing_reset_online_cpus(struct trace_array *tr);
 int tracing_open_generic(struct inode *inode, struct file *filp);
 struct dentry *tracing_init_dentry(void);
 void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
 
+struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
+						struct trace_array_cpu *data);
+void tracing_generic_entry_update(struct trace_entry *entry,
+				  unsigned long flags,
+				  int pc);
+
 void ftrace(struct trace_array *tr,
 			    struct trace_array_cpu *data,
 			    unsigned long ip,
 			    unsigned long parent_ip,
-			    unsigned long flags);
+			    unsigned long flags, int pc);
 void tracing_sched_switch_trace(struct trace_array *tr,
 				struct trace_array_cpu *data,
 				struct task_struct *prev,
 				struct task_struct *next,
-				unsigned long flags);
+				unsigned long flags, int pc);
 void tracing_record_cmdline(struct task_struct *tsk);
 
 void tracing_sched_wakeup_trace(struct trace_array *tr,
 				struct trace_array_cpu *data,
 				struct task_struct *wakee,
 				struct task_struct *cur,
-				unsigned long flags);
+				unsigned long flags, int pc);
 void trace_special(struct trace_array *tr,
 		   struct trace_array_cpu *data,
 		   unsigned long arg1,
 		   unsigned long arg2,
-		   unsigned long arg3);
+		   unsigned long arg3, int pc);
 void trace_function(struct trace_array *tr,
 		    struct trace_array_cpu *data,
 		    unsigned long ip,
 		    unsigned long parent_ip,
-		    unsigned long flags);
+		    unsigned long flags, int pc);
+
+void trace_graph_return(struct ftrace_graph_ret *trace);
+int trace_graph_entry(struct ftrace_graph_ent *trace);
+void trace_hw_branch(struct trace_array *tr, u64 from, u64 to);
 
 void tracing_start_cmdline_record(void);
 void tracing_stop_cmdline_record(void);
+void tracing_sched_switch_assign_trace(struct trace_array *tr);
+void tracing_stop_sched_switch_record(void);
+void tracing_start_sched_switch_record(void);
 int register_tracer(struct tracer *type);
 void unregister_tracer(struct tracer *type);
 
@@ -239,7 +436,7 @@ void update_max_tr_single(struct trace_array *tr,
 
 extern cycle_t ftrace_now(int cpu);
 
-#ifdef CONFIG_FTRACE
+#ifdef CONFIG_FUNCTION_TRACER
 void tracing_start_function_trace(void);
 void tracing_stop_function_trace(void);
 #else
@@ -260,6 +457,7 @@ struct tracer_switch_ops {
 	struct tracer_switch_ops	*next;
 };
 
+char *trace_find_cmdline(int pid);
 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
 
 #ifdef CONFIG_DYNAMIC_FTRACE
@@ -268,54 +466,96 @@ extern unsigned long ftrace_update_tot_cnt;
 extern int DYN_FTRACE_TEST_NAME(void);
 #endif
 
-#ifdef CONFIG_MMIOTRACE
-extern void __trace_mmiotrace_rw(struct trace_array *tr,
-				struct trace_array_cpu *data,
-				struct mmiotrace_rw *rw);
-extern void __trace_mmiotrace_map(struct trace_array *tr,
-				struct trace_array_cpu *data,
-				struct mmiotrace_map *map);
-#endif
-
 #ifdef CONFIG_FTRACE_STARTUP_TEST
-#ifdef CONFIG_FTRACE
 extern int trace_selftest_startup_function(struct tracer *trace,
 					   struct trace_array *tr);
-#endif
-#ifdef CONFIG_IRQSOFF_TRACER
 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
 					  struct trace_array *tr);
-#endif
-#ifdef CONFIG_PREEMPT_TRACER
 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
 					     struct trace_array *tr);
-#endif
-#if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER)
 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
 						 struct trace_array *tr);
-#endif
-#ifdef CONFIG_SCHED_TRACER
 extern int trace_selftest_startup_wakeup(struct tracer *trace,
 					 struct trace_array *tr);
-#endif
-#ifdef CONFIG_CONTEXT_SWITCH_TRACER
+extern int trace_selftest_startup_nop(struct tracer *trace,
+					 struct trace_array *tr);
 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 					       struct trace_array *tr);
-#endif
-#ifdef CONFIG_SYSPROF_TRACER
 extern int trace_selftest_startup_sysprof(struct tracer *trace,
 					       struct trace_array *tr);
-#endif
+extern int trace_selftest_startup_branch(struct tracer *trace,
+					 struct trace_array *tr);
 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 
 extern void *head_page(struct trace_array_cpu *data);
 extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
+extern void trace_seq_print_cont(struct trace_seq *s,
+				 struct trace_iterator *iter);
+
+extern int
+seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
+		unsigned long sym_flags);
 extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
 				 size_t cnt);
 extern long ns2usecs(cycle_t nsec);
+extern int
+trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args);
 
 extern unsigned long trace_flags;
 
+/* Standard output formatting function used for function return traces */
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+extern enum print_line_t print_graph_function(struct trace_iterator *iter);
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+/* TODO: make this variable */
+#define FTRACE_GRAPH_MAX_FUNCS		32
+extern int ftrace_graph_count;
+extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
+
+static inline int ftrace_graph_addr(unsigned long addr)
+{
+	int i;
+
+	if (!ftrace_graph_count || test_tsk_trace_graph(current))
+		return 1;
+
+	for (i = 0; i < ftrace_graph_count; i++) {
+		if (addr == ftrace_graph_funcs[i])
+			return 1;
+	}
+
+	return 0;
+}
+#else
+static inline int ftrace_trace_addr(unsigned long addr)
+{
+	return 1;
+}
+static inline int ftrace_graph_addr(unsigned long addr)
+{
+	return 1;
+}
+#endif /* CONFIG_DYNAMIC_FTRACE */
+
+#else /* CONFIG_FUNCTION_GRAPH_TRACER */
+static inline enum print_line_t
+print_graph_function(struct trace_iterator *iter)
+{
+	return TRACE_TYPE_UNHANDLED;
+}
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
+extern struct pid *ftrace_pid_trace;
+
+static inline int ftrace_trace_task(struct task_struct *task)
+{
+	if (!ftrace_pid_trace)
+		return 1;
+
+	return test_tsk_trace_trace(task);
+}
+
 /*
  * trace_iterator_flags is an enumeration that defines bit
  * positions into trace_flags that controls the output.
@@ -334,6 +574,94 @@ enum trace_iterator_flags {
 	TRACE_ITER_BLOCK		= 0x80,
 	TRACE_ITER_STACKTRACE		= 0x100,
 	TRACE_ITER_SCHED_TREE		= 0x200,
+	TRACE_ITER_PRINTK		= 0x400,
+	TRACE_ITER_PREEMPTONLY		= 0x800,
+	TRACE_ITER_BRANCH		= 0x1000,
+	TRACE_ITER_ANNOTATE		= 0x2000,
+	TRACE_ITER_USERSTACKTRACE       = 0x4000,
+	TRACE_ITER_SYM_USEROBJ          = 0x8000,
+	TRACE_ITER_PRINTK_MSGONLY	= 0x10000
 };
 
+/*
+ * TRACE_ITER_SYM_MASK masks the options in trace_flags that
+ * control the output of kernel symbols.
+ */
+#define TRACE_ITER_SYM_MASK \
+	(TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
+
+extern struct tracer nop_trace;
+
+/**
+ * ftrace_preempt_disable - disable preemption scheduler safe
+ *
+ * When tracing can happen inside the scheduler, there exists
+ * cases that the tracing might happen before the need_resched
+ * flag is checked. If this happens and the tracer calls
+ * preempt_enable (after a disable), a schedule might take place
+ * causing an infinite recursion.
+ *
+ * To prevent this, we read the need_recshed flag before
+ * disabling preemption. When we want to enable preemption we
+ * check the flag, if it is set, then we call preempt_enable_no_resched.
+ * Otherwise, we call preempt_enable.
+ *
+ * The rational for doing the above is that if need resched is set
+ * and we have yet to reschedule, we are either in an atomic location
+ * (where we do not need to check for scheduling) or we are inside
+ * the scheduler and do not want to resched.
+ */
+static inline int ftrace_preempt_disable(void)
+{
+	int resched;
+
+	resched = need_resched();
+	preempt_disable_notrace();
+
+	return resched;
+}
+
+/**
+ * ftrace_preempt_enable - enable preemption scheduler safe
+ * @resched: the return value from ftrace_preempt_disable
+ *
+ * This is a scheduler safe way to enable preemption and not miss
+ * any preemption checks. The disabled saved the state of preemption.
+ * If resched is set, then we were either inside an atomic or
+ * are inside the scheduler (we would have already scheduled
+ * otherwise). In this case, we do not want to call normal
+ * preempt_enable, but preempt_enable_no_resched instead.
+ */
+static inline void ftrace_preempt_enable(int resched)
+{
+	if (resched)
+		preempt_enable_no_resched_notrace();
+	else
+		preempt_enable_notrace();
+}
+
+#ifdef CONFIG_BRANCH_TRACER
+extern int enable_branch_tracing(struct trace_array *tr);
+extern void disable_branch_tracing(void);
+static inline int trace_branch_enable(struct trace_array *tr)
+{
+	if (trace_flags & TRACE_ITER_BRANCH)
+		return enable_branch_tracing(tr);
+	return 0;
+}
+static inline void trace_branch_disable(void)
+{
+	/* due to races, always disable */
+	disable_branch_tracing();
+}
+#else
+static inline int trace_branch_enable(struct trace_array *tr)
+{
+	return 0;
+}
+static inline void trace_branch_disable(void)
+{
+}
+#endif /* CONFIG_BRANCH_TRACER */
+
 #endif /* _LINUX_KERNEL_TRACE_H */
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
new file mode 100644
index 000000000000..3ccebde28482
--- /dev/null
+++ b/kernel/trace/trace_boot.c
@@ -0,0 +1,186 @@
+/*
+ * ring buffer based initcalls tracer
+ *
+ * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/debugfs.h>
+#include <linux/ftrace.h>
+#include <linux/kallsyms.h>
+
+#include "trace.h"
+
+static struct trace_array *boot_trace;
+static bool pre_initcalls_finished;
+
+/* Tells the boot tracer that the pre_smp_initcalls are finished.
+ * So we are ready .
+ * It doesn't enable sched events tracing however.
+ * You have to call enable_boot_trace to do so.
+ */
+void start_boot_trace(void)
+{
+	pre_initcalls_finished = true;
+}
+
+void enable_boot_trace(void)
+{
+	if (pre_initcalls_finished)
+		tracing_start_sched_switch_record();
+}
+
+void disable_boot_trace(void)
+{
+	if (pre_initcalls_finished)
+		tracing_stop_sched_switch_record();
+}
+
+static int boot_trace_init(struct trace_array *tr)
+{
+	int cpu;
+	boot_trace = tr;
+
+	for_each_cpu_mask(cpu, cpu_possible_map)
+		tracing_reset(tr, cpu);
+
+	tracing_sched_switch_assign_trace(tr);
+	return 0;
+}
+
+static enum print_line_t
+initcall_call_print_line(struct trace_iterator *iter)
+{
+	struct trace_entry *entry = iter->ent;
+	struct trace_seq *s = &iter->seq;
+	struct trace_boot_call *field;
+	struct boot_trace_call *call;
+	u64 ts;
+	unsigned long nsec_rem;
+	int ret;
+
+	trace_assign_type(field, entry);
+	call = &field->boot_call;
+	ts = iter->ts;
+	nsec_rem = do_div(ts, 1000000000);
+
+	ret = trace_seq_printf(s, "[%5ld.%09ld] calling  %s @ %i\n",
+			(unsigned long)ts, nsec_rem, call->func, call->caller);
+
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+	else
+		return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+initcall_ret_print_line(struct trace_iterator *iter)
+{
+	struct trace_entry *entry = iter->ent;
+	struct trace_seq *s = &iter->seq;
+	struct trace_boot_ret *field;
+	struct boot_trace_ret *init_ret;
+	u64 ts;
+	unsigned long nsec_rem;
+	int ret;
+
+	trace_assign_type(field, entry);
+	init_ret = &field->boot_ret;
+	ts = iter->ts;
+	nsec_rem = do_div(ts, 1000000000);
+
+	ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s "
+			"returned %d after %llu msecs\n",
+			(unsigned long) ts,
+			nsec_rem,
+			init_ret->func, init_ret->result, init_ret->duration);
+
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+	else
+		return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t initcall_print_line(struct trace_iterator *iter)
+{
+	struct trace_entry *entry = iter->ent;
+
+	switch (entry->type) {
+	case TRACE_BOOT_CALL:
+		return initcall_call_print_line(iter);
+	case TRACE_BOOT_RET:
+		return initcall_ret_print_line(iter);
+	default:
+		return TRACE_TYPE_UNHANDLED;
+	}
+}
+
+struct tracer boot_tracer __read_mostly =
+{
+	.name		= "initcall",
+	.init		= boot_trace_init,
+	.reset		= tracing_reset_online_cpus,
+	.print_line	= initcall_print_line,
+};
+
+void trace_boot_call(struct boot_trace_call *bt, initcall_t fn)
+{
+	struct ring_buffer_event *event;
+	struct trace_boot_call *entry;
+	unsigned long irq_flags;
+	struct trace_array *tr = boot_trace;
+
+	if (!pre_initcalls_finished)
+		return;
+
+	/* Get its name now since this function could
+	 * disappear because it is in the .init section.
+	 */
+	sprint_symbol(bt->func, (unsigned long)fn);
+	preempt_disable();
+
+	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+					 &irq_flags);
+	if (!event)
+		goto out;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, 0, 0);
+	entry->ent.type = TRACE_BOOT_CALL;
+	entry->boot_call = *bt;
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+	trace_wake_up();
+
+ out:
+	preempt_enable();
+}
+
+void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn)
+{
+	struct ring_buffer_event *event;
+	struct trace_boot_ret *entry;
+	unsigned long irq_flags;
+	struct trace_array *tr = boot_trace;
+
+	if (!pre_initcalls_finished)
+		return;
+
+	sprint_symbol(bt->func, (unsigned long)fn);
+	preempt_disable();
+
+	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+					 &irq_flags);
+	if (!event)
+		goto out;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, 0, 0);
+	entry->ent.type = TRACE_BOOT_RET;
+	entry->boot_ret = *bt;
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+	trace_wake_up();
+
+ out:
+	preempt_enable();
+}
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
new file mode 100644
index 000000000000..6c00feb3bac7
--- /dev/null
+++ b/kernel/trace/trace_branch.c
@@ -0,0 +1,342 @@
+/*
+ * unlikely profiler
+ *
+ * Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com>
+ */
+#include <linux/kallsyms.h>
+#include <linux/seq_file.h>
+#include <linux/spinlock.h>
+#include <linux/irqflags.h>
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/ftrace.h>
+#include <linux/hash.h>
+#include <linux/fs.h>
+#include <asm/local.h>
+#include "trace.h"
+
+#ifdef CONFIG_BRANCH_TRACER
+
+static int branch_tracing_enabled __read_mostly;
+static DEFINE_MUTEX(branch_tracing_mutex);
+static struct trace_array *branch_tracer;
+
+static void
+probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
+{
+	struct trace_array *tr = branch_tracer;
+	struct ring_buffer_event *event;
+	struct trace_branch *entry;
+	unsigned long flags, irq_flags;
+	int cpu, pc;
+	const char *p;
+
+	/*
+	 * I would love to save just the ftrace_likely_data pointer, but
+	 * this code can also be used by modules. Ugly things can happen
+	 * if the module is unloaded, and then we go and read the
+	 * pointer.  This is slower, but much safer.
+	 */
+
+	if (unlikely(!tr))
+		return;
+
+	local_irq_save(flags);
+	cpu = raw_smp_processor_id();
+	if (atomic_inc_return(&tr->data[cpu]->disabled) != 1)
+		goto out;
+
+	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+					 &irq_flags);
+	if (!event)
+		goto out;
+
+	pc = preempt_count();
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, flags, pc);
+	entry->ent.type		= TRACE_BRANCH;
+
+	/* Strip off the path, only save the file */
+	p = f->file + strlen(f->file);
+	while (p >= f->file && *p != '/')
+		p--;
+	p++;
+
+	strncpy(entry->func, f->func, TRACE_FUNC_SIZE);
+	strncpy(entry->file, p, TRACE_FILE_SIZE);
+	entry->func[TRACE_FUNC_SIZE] = 0;
+	entry->file[TRACE_FILE_SIZE] = 0;
+	entry->line = f->line;
+	entry->correct = val == expect;
+
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+ out:
+	atomic_dec(&tr->data[cpu]->disabled);
+	local_irq_restore(flags);
+}
+
+static inline
+void trace_likely_condition(struct ftrace_branch_data *f, int val, int expect)
+{
+	if (!branch_tracing_enabled)
+		return;
+
+	probe_likely_condition(f, val, expect);
+}
+
+int enable_branch_tracing(struct trace_array *tr)
+{
+	int ret = 0;
+
+	mutex_lock(&branch_tracing_mutex);
+	branch_tracer = tr;
+	/*
+	 * Must be seen before enabling. The reader is a condition
+	 * where we do not need a matching rmb()
+	 */
+	smp_wmb();
+	branch_tracing_enabled++;
+	mutex_unlock(&branch_tracing_mutex);
+
+	return ret;
+}
+
+void disable_branch_tracing(void)
+{
+	mutex_lock(&branch_tracing_mutex);
+
+	if (!branch_tracing_enabled)
+		goto out_unlock;
+
+	branch_tracing_enabled--;
+
+ out_unlock:
+	mutex_unlock(&branch_tracing_mutex);
+}
+
+static void start_branch_trace(struct trace_array *tr)
+{
+	enable_branch_tracing(tr);
+}
+
+static void stop_branch_trace(struct trace_array *tr)
+{
+	disable_branch_tracing();
+}
+
+static int branch_trace_init(struct trace_array *tr)
+{
+	int cpu;
+
+	for_each_online_cpu(cpu)
+		tracing_reset(tr, cpu);
+
+	start_branch_trace(tr);
+	return 0;
+}
+
+static void branch_trace_reset(struct trace_array *tr)
+{
+	stop_branch_trace(tr);
+}
+
+struct tracer branch_trace __read_mostly =
+{
+	.name		= "branch",
+	.init		= branch_trace_init,
+	.reset		= branch_trace_reset,
+#ifdef CONFIG_FTRACE_SELFTEST
+	.selftest	= trace_selftest_startup_branch,
+#endif
+};
+
+__init static int init_branch_trace(void)
+{
+	return register_tracer(&branch_trace);
+}
+
+device_initcall(init_branch_trace);
+#else
+static inline
+void trace_likely_condition(struct ftrace_branch_data *f, int val, int expect)
+{
+}
+#endif /* CONFIG_BRANCH_TRACER */
+
+void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect)
+{
+	/*
+	 * I would love to have a trace point here instead, but the
+	 * trace point code is so inundated with unlikely and likely
+	 * conditions that the recursive nightmare that exists is too
+	 * much to try to get working. At least for now.
+	 */
+	trace_likely_condition(f, val, expect);
+
+	/* FIXME: Make this atomic! */
+	if (val == expect)
+		f->correct++;
+	else
+		f->incorrect++;
+}
+EXPORT_SYMBOL(ftrace_likely_update);
+
+struct ftrace_pointer {
+	void		*start;
+	void		*stop;
+	int		hit;
+};
+
+static void *
+t_next(struct seq_file *m, void *v, loff_t *pos)
+{
+	const struct ftrace_pointer *f = m->private;
+	struct ftrace_branch_data *p = v;
+
+	(*pos)++;
+
+	if (v == (void *)1)
+		return f->start;
+
+	++p;
+
+	if ((void *)p >= (void *)f->stop)
+		return NULL;
+
+	return p;
+}
+
+static void *t_start(struct seq_file *m, loff_t *pos)
+{
+	void *t = (void *)1;
+	loff_t l = 0;
+
+	for (; t && l < *pos; t = t_next(m, t, &l))
+		;
+
+	return t;
+}
+
+static void t_stop(struct seq_file *m, void *p)
+{
+}
+
+static int t_show(struct seq_file *m, void *v)
+{
+	const struct ftrace_pointer *fp = m->private;
+	struct ftrace_branch_data *p = v;
+	const char *f;
+	long percent;
+
+	if (v == (void *)1) {
+		if (fp->hit)
+			seq_printf(m, "   miss      hit    %% ");
+		else
+			seq_printf(m, " correct incorrect  %% ");
+		seq_printf(m, "       Function                "
+			      "  File              Line\n"
+			      " ------- ---------  - "
+			      "       --------                "
+			      "  ----              ----\n");
+		return 0;
+	}
+
+	/* Only print the file, not the path */
+	f = p->file + strlen(p->file);
+	while (f >= p->file && *f != '/')
+		f--;
+	f++;
+
+	/*
+	 * The miss is overlayed on correct, and hit on incorrect.
+	 */
+	if (p->correct) {
+		percent = p->incorrect * 100;
+		percent /= p->correct + p->incorrect;
+	} else
+		percent = p->incorrect ? 100 : -1;
+
+	seq_printf(m, "%8lu %8lu ",  p->correct, p->incorrect);
+	if (percent < 0)
+		seq_printf(m, "  X ");
+	else
+		seq_printf(m, "%3ld ", percent);
+	seq_printf(m, "%-30.30s %-20.20s %d\n", p->func, f, p->line);
+	return 0;
+}
+
+static struct seq_operations tracing_likely_seq_ops = {
+	.start		= t_start,
+	.next		= t_next,
+	.stop		= t_stop,
+	.show		= t_show,
+};
+
+static int tracing_branch_open(struct inode *inode, struct file *file)
+{
+	int ret;
+
+	ret = seq_open(file, &tracing_likely_seq_ops);
+	if (!ret) {
+		struct seq_file *m = file->private_data;
+		m->private = (void *)inode->i_private;
+	}
+
+	return ret;
+}
+
+static const struct file_operations tracing_branch_fops = {
+	.open		= tracing_branch_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+};
+
+#ifdef CONFIG_PROFILE_ALL_BRANCHES
+extern unsigned long __start_branch_profile[];
+extern unsigned long __stop_branch_profile[];
+
+static const struct ftrace_pointer ftrace_branch_pos = {
+	.start			= __start_branch_profile,
+	.stop			= __stop_branch_profile,
+	.hit			= 1,
+};
+
+#endif /* CONFIG_PROFILE_ALL_BRANCHES */
+
+extern unsigned long __start_annotated_branch_profile[];
+extern unsigned long __stop_annotated_branch_profile[];
+
+static const struct ftrace_pointer ftrace_annotated_branch_pos = {
+	.start			= __start_annotated_branch_profile,
+	.stop			= __stop_annotated_branch_profile,
+};
+
+static __init int ftrace_branch_init(void)
+{
+	struct dentry *d_tracer;
+	struct dentry *entry;
+
+	d_tracer = tracing_init_dentry();
+
+	entry = debugfs_create_file("profile_annotated_branch", 0444, d_tracer,
+				    (void *)&ftrace_annotated_branch_pos,
+				    &tracing_branch_fops);
+	if (!entry)
+		pr_warning("Could not create debugfs "
+			   "'profile_annotatet_branch' entry\n");
+
+#ifdef CONFIG_PROFILE_ALL_BRANCHES
+	entry = debugfs_create_file("profile_branch", 0444, d_tracer,
+				    (void *)&ftrace_branch_pos,
+				    &tracing_branch_fops);
+	if (!entry)
+		pr_warning("Could not create debugfs"
+			   " 'profile_branch' entry\n");
+#endif
+
+	return 0;
+}
+
+device_initcall(ftrace_branch_init);
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index 312144897970..9236d7e25a16 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -16,20 +16,10 @@
 
 #include "trace.h"
 
-static void function_reset(struct trace_array *tr)
-{
-	int cpu;
-
-	tr->time_start = ftrace_now(tr->cpu);
-
-	for_each_online_cpu(cpu)
-		tracing_reset(tr->data[cpu]);
-}
-
 static void start_function_trace(struct trace_array *tr)
 {
 	tr->cpu = get_cpu();
-	function_reset(tr);
+	tracing_reset_online_cpus(tr);
 	put_cpu();
 
 	tracing_start_cmdline_record();
@@ -42,32 +32,28 @@ static void stop_function_trace(struct trace_array *tr)
 	tracing_stop_cmdline_record();
 }
 
-static void function_trace_init(struct trace_array *tr)
+static int function_trace_init(struct trace_array *tr)
 {
-	if (tr->ctrl)
-		start_function_trace(tr);
+	start_function_trace(tr);
+	return 0;
 }
 
 static void function_trace_reset(struct trace_array *tr)
 {
-	if (tr->ctrl)
-		stop_function_trace(tr);
+	stop_function_trace(tr);
 }
 
-static void function_trace_ctrl_update(struct trace_array *tr)
+static void function_trace_start(struct trace_array *tr)
 {
-	if (tr->ctrl)
-		start_function_trace(tr);
-	else
-		stop_function_trace(tr);
+	tracing_reset_online_cpus(tr);
 }
 
 static struct tracer function_trace __read_mostly =
 {
-	.name	     = "ftrace",
+	.name	     = "function",
 	.init	     = function_trace_init,
 	.reset	     = function_trace_reset,
-	.ctrl_update = function_trace_ctrl_update,
+	.start	     = function_trace_start,
 #ifdef CONFIG_FTRACE_SELFTEST
 	.selftest    = trace_selftest_startup_function,
 #endif
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
new file mode 100644
index 000000000000..4bf39fcae97a
--- /dev/null
+++ b/kernel/trace/trace_functions_graph.c
@@ -0,0 +1,669 @@
+/*
+ *
+ * Function graph tracer.
+ * Copyright (c) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ * Mostly borrowed from function tracer which
+ * is Copyright (c) Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/ftrace.h>
+#include <linux/fs.h>
+
+#include "trace.h"
+
+#define TRACE_GRAPH_INDENT	2
+
+/* Flag options */
+#define TRACE_GRAPH_PRINT_OVERRUN	0x1
+#define TRACE_GRAPH_PRINT_CPU		0x2
+#define TRACE_GRAPH_PRINT_OVERHEAD	0x4
+#define TRACE_GRAPH_PRINT_PROC		0x8
+
+static struct tracer_opt trace_opts[] = {
+	/* Display overruns ? */
+	{ TRACER_OPT(funcgraph-overrun, TRACE_GRAPH_PRINT_OVERRUN) },
+	/* Display CPU ? */
+	{ TRACER_OPT(funcgraph-cpu, TRACE_GRAPH_PRINT_CPU) },
+	/* Display Overhead ? */
+	{ TRACER_OPT(funcgraph-overhead, TRACE_GRAPH_PRINT_OVERHEAD) },
+	/* Display proc name/pid */
+	{ TRACER_OPT(funcgraph-proc, TRACE_GRAPH_PRINT_PROC) },
+	{ } /* Empty entry */
+};
+
+static struct tracer_flags tracer_flags = {
+	/* Don't display overruns and proc by default */
+	.val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD,
+	.opts = trace_opts
+};
+
+/* pid on the last trace processed */
+static pid_t last_pid[NR_CPUS] = { [0 ... NR_CPUS-1] = -1 };
+
+static int graph_trace_init(struct trace_array *tr)
+{
+	int cpu, ret;
+
+	for_each_online_cpu(cpu)
+		tracing_reset(tr, cpu);
+
+	ret = register_ftrace_graph(&trace_graph_return,
+					&trace_graph_entry);
+	if (ret)
+		return ret;
+	tracing_start_cmdline_record();
+
+	return 0;
+}
+
+static void graph_trace_reset(struct trace_array *tr)
+{
+	tracing_stop_cmdline_record();
+	unregister_ftrace_graph();
+}
+
+static inline int log10_cpu(int nb)
+{
+	if (nb / 100)
+		return 3;
+	if (nb / 10)
+		return 2;
+	return 1;
+}
+
+static enum print_line_t
+print_graph_cpu(struct trace_seq *s, int cpu)
+{
+	int i;
+	int ret;
+	int log10_this = log10_cpu(cpu);
+	int log10_all = log10_cpu(cpus_weight_nr(cpu_online_map));
+
+
+	/*
+	 * Start with a space character - to make it stand out
+	 * to the right a bit when trace output is pasted into
+	 * email:
+	 */
+	ret = trace_seq_printf(s, " ");
+
+	/*
+	 * Tricky - we space the CPU field according to the max
+	 * number of online CPUs. On a 2-cpu system it would take
+	 * a maximum of 1 digit - on a 128 cpu system it would
+	 * take up to 3 digits:
+	 */
+	for (i = 0; i < log10_all - log10_this; i++) {
+		ret = trace_seq_printf(s, " ");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+	ret = trace_seq_printf(s, "%d) ", cpu);
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	return TRACE_TYPE_HANDLED;
+}
+
+#define TRACE_GRAPH_PROCINFO_LENGTH	14
+
+static enum print_line_t
+print_graph_proc(struct trace_seq *s, pid_t pid)
+{
+	int i;
+	int ret;
+	int len;
+	char comm[8];
+	int spaces = 0;
+	/* sign + log10(MAX_INT) + '\0' */
+	char pid_str[11];
+
+	strncpy(comm, trace_find_cmdline(pid), 7);
+	comm[7] = '\0';
+	sprintf(pid_str, "%d", pid);
+
+	/* 1 stands for the "-" character */
+	len = strlen(comm) + strlen(pid_str) + 1;
+
+	if (len < TRACE_GRAPH_PROCINFO_LENGTH)
+		spaces = TRACE_GRAPH_PROCINFO_LENGTH - len;
+
+	/* First spaces to align center */
+	for (i = 0; i < spaces / 2; i++) {
+		ret = trace_seq_printf(s, " ");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	ret = trace_seq_printf(s, "%s-%s", comm, pid_str);
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	/* Last spaces to align center */
+	for (i = 0; i < spaces - (spaces / 2); i++) {
+		ret = trace_seq_printf(s, " ");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+	return TRACE_TYPE_HANDLED;
+}
+
+
+/* If the pid changed since the last trace, output this event */
+static enum print_line_t
+verif_pid(struct trace_seq *s, pid_t pid, int cpu)
+{
+	pid_t prev_pid;
+	int ret;
+
+	if (last_pid[cpu] != -1 && last_pid[cpu] == pid)
+		return TRACE_TYPE_HANDLED;
+
+	prev_pid = last_pid[cpu];
+	last_pid[cpu] = pid;
+
+/*
+ * Context-switch trace line:
+
+ ------------------------------------------
+ | 1)  migration/0--1  =>  sshd-1755
+ ------------------------------------------
+
+ */
+	ret = trace_seq_printf(s,
+		" ------------------------------------------\n");
+	if (!ret)
+		TRACE_TYPE_PARTIAL_LINE;
+
+	ret = print_graph_cpu(s, cpu);
+	if (ret == TRACE_TYPE_PARTIAL_LINE)
+		TRACE_TYPE_PARTIAL_LINE;
+
+	ret = print_graph_proc(s, prev_pid);
+	if (ret == TRACE_TYPE_PARTIAL_LINE)
+		TRACE_TYPE_PARTIAL_LINE;
+
+	ret = trace_seq_printf(s, " => ");
+	if (!ret)
+		TRACE_TYPE_PARTIAL_LINE;
+
+	ret = print_graph_proc(s, pid);
+	if (ret == TRACE_TYPE_PARTIAL_LINE)
+		TRACE_TYPE_PARTIAL_LINE;
+
+	ret = trace_seq_printf(s,
+		"\n ------------------------------------------\n\n");
+	if (!ret)
+		TRACE_TYPE_PARTIAL_LINE;
+
+	return ret;
+}
+
+static bool
+trace_branch_is_leaf(struct trace_iterator *iter,
+		struct ftrace_graph_ent_entry *curr)
+{
+	struct ring_buffer_iter *ring_iter;
+	struct ring_buffer_event *event;
+	struct ftrace_graph_ret_entry *next;
+
+	ring_iter = iter->buffer_iter[iter->cpu];
+
+	if (!ring_iter)
+		return false;
+
+	event = ring_buffer_iter_peek(ring_iter, NULL);
+
+	if (!event)
+		return false;
+
+	next = ring_buffer_event_data(event);
+
+	if (next->ent.type != TRACE_GRAPH_RET)
+		return false;
+
+	if (curr->ent.pid != next->ent.pid ||
+			curr->graph_ent.func != next->ret.func)
+		return false;
+
+	return true;
+}
+
+static enum print_line_t
+print_graph_irq(struct trace_seq *s, unsigned long addr,
+				enum trace_type type, int cpu, pid_t pid)
+{
+	int ret;
+
+	if (addr < (unsigned long)__irqentry_text_start ||
+		addr >= (unsigned long)__irqentry_text_end)
+		return TRACE_TYPE_UNHANDLED;
+
+	if (type == TRACE_GRAPH_ENT) {
+		ret = trace_seq_printf(s, "==========> |  ");
+	} else {
+		/* Cpu */
+		if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+			ret = print_graph_cpu(s, cpu);
+			if (ret == TRACE_TYPE_PARTIAL_LINE)
+				return TRACE_TYPE_PARTIAL_LINE;
+		}
+		/* Proc */
+		if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+			ret = print_graph_proc(s, pid);
+			if (ret == TRACE_TYPE_PARTIAL_LINE)
+				return TRACE_TYPE_PARTIAL_LINE;
+
+			ret = trace_seq_printf(s, " | ");
+			if (!ret)
+				return TRACE_TYPE_PARTIAL_LINE;
+		}
+
+		/* No overhead */
+		if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+			ret = trace_seq_printf(s, "  ");
+			if (!ret)
+				return TRACE_TYPE_PARTIAL_LINE;
+		}
+
+		ret = trace_seq_printf(s, "<========== |\n");
+	}
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+	return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+print_graph_duration(unsigned long long duration, struct trace_seq *s)
+{
+	unsigned long nsecs_rem = do_div(duration, 1000);
+	/* log10(ULONG_MAX) + '\0' */
+	char msecs_str[21];
+	char nsecs_str[5];
+	int ret, len;
+	int i;
+
+	sprintf(msecs_str, "%lu", (unsigned long) duration);
+
+	/* Print msecs */
+	ret = trace_seq_printf(s, msecs_str);
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	len = strlen(msecs_str);
+
+	/* Print nsecs (we don't want to exceed 7 numbers) */
+	if (len < 7) {
+		snprintf(nsecs_str, 8 - len, "%03lu", nsecs_rem);
+		ret = trace_seq_printf(s, ".%s", nsecs_str);
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+		len += strlen(nsecs_str);
+	}
+
+	ret = trace_seq_printf(s, " us ");
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	/* Print remaining spaces to fit the row's width */
+	for (i = len; i < 7; i++) {
+		ret = trace_seq_printf(s, " ");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	ret = trace_seq_printf(s, "|  ");
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+	return TRACE_TYPE_HANDLED;
+
+}
+
+/* Signal a overhead of time execution to the output */
+static int
+print_graph_overhead(unsigned long long duration, struct trace_seq *s)
+{
+	/* Duration exceeded 100 msecs */
+	if (duration > 100000ULL)
+		return trace_seq_printf(s, "! ");
+
+	/* Duration exceeded 10 msecs */
+	if (duration > 10000ULL)
+		return trace_seq_printf(s, "+ ");
+
+	return trace_seq_printf(s, "  ");
+}
+
+/* Case of a leaf function on its call entry */
+static enum print_line_t
+print_graph_entry_leaf(struct trace_iterator *iter,
+		struct ftrace_graph_ent_entry *entry, struct trace_seq *s)
+{
+	struct ftrace_graph_ret_entry *ret_entry;
+	struct ftrace_graph_ret *graph_ret;
+	struct ring_buffer_event *event;
+	struct ftrace_graph_ent *call;
+	unsigned long long duration;
+	int ret;
+	int i;
+
+	event = ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
+	ret_entry = ring_buffer_event_data(event);
+	graph_ret = &ret_entry->ret;
+	call = &entry->graph_ent;
+	duration = graph_ret->rettime - graph_ret->calltime;
+
+	/* Overhead */
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+		ret = print_graph_overhead(duration, s);
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	/* Duration */
+	ret = print_graph_duration(duration, s);
+	if (ret == TRACE_TYPE_PARTIAL_LINE)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	/* Function */
+	for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
+		ret = trace_seq_printf(s, " ");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	ret = seq_print_ip_sym(s, call->func, 0);
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	ret = trace_seq_printf(s, "();\n");
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
+			struct trace_seq *s, pid_t pid, int cpu)
+{
+	int i;
+	int ret;
+	struct ftrace_graph_ent *call = &entry->graph_ent;
+
+	/* No overhead */
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+		ret = trace_seq_printf(s, "  ");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	/* Interrupt */
+	ret = print_graph_irq(s, call->func, TRACE_GRAPH_ENT, cpu, pid);
+	if (ret == TRACE_TYPE_UNHANDLED) {
+		/* No time */
+		ret = trace_seq_printf(s, "            |  ");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	} else {
+		if (ret == TRACE_TYPE_PARTIAL_LINE)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+
+	/* Function */
+	for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
+		ret = trace_seq_printf(s, " ");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	ret = seq_print_ip_sym(s, call->func, 0);
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	ret = trace_seq_printf(s, "() {\n");
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
+			struct trace_iterator *iter, int cpu)
+{
+	int ret;
+	struct trace_entry *ent = iter->ent;
+
+	/* Pid */
+	if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	/* Cpu */
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+		ret = print_graph_cpu(s, cpu);
+		if (ret == TRACE_TYPE_PARTIAL_LINE)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	/* Proc */
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+		ret = print_graph_proc(s, ent->pid);
+		if (ret == TRACE_TYPE_PARTIAL_LINE)
+			return TRACE_TYPE_PARTIAL_LINE;
+
+		ret = trace_seq_printf(s, " | ");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	if (trace_branch_is_leaf(iter, field))
+		return print_graph_entry_leaf(iter, field, s);
+	else
+		return print_graph_entry_nested(field, s, iter->ent->pid, cpu);
+
+}
+
+static enum print_line_t
+print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
+		   struct trace_entry *ent, int cpu)
+{
+	int i;
+	int ret;
+	unsigned long long duration = trace->rettime - trace->calltime;
+
+	/* Pid */
+	if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	/* Cpu */
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+		ret = print_graph_cpu(s, cpu);
+		if (ret == TRACE_TYPE_PARTIAL_LINE)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	/* Proc */
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+		ret = print_graph_proc(s, ent->pid);
+		if (ret == TRACE_TYPE_PARTIAL_LINE)
+			return TRACE_TYPE_PARTIAL_LINE;
+
+		ret = trace_seq_printf(s, " | ");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	/* Overhead */
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+		ret = print_graph_overhead(duration, s);
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	/* Duration */
+	ret = print_graph_duration(duration, s);
+	if (ret == TRACE_TYPE_PARTIAL_LINE)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	/* Closing brace */
+	for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++) {
+		ret = trace_seq_printf(s, " ");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	ret = trace_seq_printf(s, "}\n");
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	/* Overrun */
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERRUN) {
+		ret = trace_seq_printf(s, " (Overruns: %lu)\n",
+					trace->overrun);
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	ret = print_graph_irq(s, trace->func, TRACE_GRAPH_RET, cpu, ent->pid);
+	if (ret == TRACE_TYPE_PARTIAL_LINE)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+print_graph_comment(struct print_entry *trace, struct trace_seq *s,
+		   struct trace_entry *ent, struct trace_iterator *iter)
+{
+	int i;
+	int ret;
+
+	/* Pid */
+	if (verif_pid(s, ent->pid, iter->cpu) == TRACE_TYPE_PARTIAL_LINE)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	/* Cpu */
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+		ret = print_graph_cpu(s, iter->cpu);
+		if (ret == TRACE_TYPE_PARTIAL_LINE)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	/* Proc */
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+		ret = print_graph_proc(s, ent->pid);
+		if (ret == TRACE_TYPE_PARTIAL_LINE)
+			return TRACE_TYPE_PARTIAL_LINE;
+
+		ret = trace_seq_printf(s, " | ");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	/* No overhead */
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+		ret = trace_seq_printf(s, "  ");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
+
+	/* No time */
+	ret = trace_seq_printf(s, "            |  ");
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	/* Indentation */
+	if (trace->depth > 0)
+		for (i = 0; i < (trace->depth + 1) * TRACE_GRAPH_INDENT; i++) {
+			ret = trace_seq_printf(s, " ");
+			if (!ret)
+				return TRACE_TYPE_PARTIAL_LINE;
+		}
+
+	/* The comment */
+	ret = trace_seq_printf(s, "/* %s", trace->buf);
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	if (ent->flags & TRACE_FLAG_CONT)
+		trace_seq_print_cont(s, iter);
+
+	ret = trace_seq_printf(s, " */\n");
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	return TRACE_TYPE_HANDLED;
+}
+
+
+enum print_line_t
+print_graph_function(struct trace_iterator *iter)
+{
+	struct trace_seq *s = &iter->seq;
+	struct trace_entry *entry = iter->ent;
+
+	switch (entry->type) {
+	case TRACE_GRAPH_ENT: {
+		struct ftrace_graph_ent_entry *field;
+		trace_assign_type(field, entry);
+		return print_graph_entry(field, s, iter,
+					 iter->cpu);
+	}
+	case TRACE_GRAPH_RET: {
+		struct ftrace_graph_ret_entry *field;
+		trace_assign_type(field, entry);
+		return print_graph_return(&field->ret, s, entry, iter->cpu);
+	}
+	case TRACE_PRINT: {
+		struct print_entry *field;
+		trace_assign_type(field, entry);
+		return print_graph_comment(field, s, entry, iter);
+	}
+	default:
+		return TRACE_TYPE_UNHANDLED;
+	}
+}
+
+static void print_graph_headers(struct seq_file *s)
+{
+	/* 1st line */
+	seq_printf(s, "# ");
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
+		seq_printf(s, "CPU ");
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
+		seq_printf(s, "TASK/PID     ");
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD)
+		seq_printf(s, "OVERHEAD/");
+	seq_printf(s, "DURATION            FUNCTION CALLS\n");
+
+	/* 2nd line */
+	seq_printf(s, "# ");
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
+		seq_printf(s, "|   ");
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
+		seq_printf(s, "|      |     ");
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+		seq_printf(s, "|        ");
+		seq_printf(s, "|                   |   |   |   |\n");
+	} else
+		seq_printf(s, "    |               |   |   |   |\n");
+}
+static struct tracer graph_trace __read_mostly = {
+	.name	     	= "function_graph",
+	.init	     	= graph_trace_init,
+	.reset	     	= graph_trace_reset,
+	.print_line	= print_graph_function,
+	.print_header	= print_graph_headers,
+	.flags		= &tracer_flags,
+};
+
+static __init int init_graph_trace(void)
+{
+	return register_tracer(&graph_trace);
+}
+
+device_initcall(init_graph_trace);
diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c
new file mode 100644
index 000000000000..b6a3e20a49a9
--- /dev/null
+++ b/kernel/trace/trace_hw_branches.c
@@ -0,0 +1,195 @@
+/*
+ * h/w branch tracer for x86 based on bts
+ *
+ * Copyright (C) 2008 Markus Metzger <markus.t.metzger@gmail.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <linux/ftrace.h>
+#include <linux/kallsyms.h>
+
+#include <asm/ds.h>
+
+#include "trace.h"
+
+
+#define SIZEOF_BTS (1 << 13)
+
+static DEFINE_PER_CPU(struct bts_tracer *, tracer);
+static DEFINE_PER_CPU(unsigned char[SIZEOF_BTS], buffer);
+
+#define this_tracer per_cpu(tracer, smp_processor_id())
+#define this_buffer per_cpu(buffer, smp_processor_id())
+
+
+static void bts_trace_start_cpu(void *arg)
+{
+	if (this_tracer)
+		ds_release_bts(this_tracer);
+
+	this_tracer =
+		ds_request_bts(/* task = */ NULL, this_buffer, SIZEOF_BTS,
+			       /* ovfl = */ NULL, /* th = */ (size_t)-1,
+			       BTS_KERNEL);
+	if (IS_ERR(this_tracer)) {
+		this_tracer = NULL;
+		return;
+	}
+}
+
+static void bts_trace_start(struct trace_array *tr)
+{
+	int cpu;
+
+	tracing_reset_online_cpus(tr);
+
+	for_each_cpu_mask(cpu, cpu_possible_map)
+		smp_call_function_single(cpu, bts_trace_start_cpu, NULL, 1);
+}
+
+static void bts_trace_stop_cpu(void *arg)
+{
+	if (this_tracer) {
+		ds_release_bts(this_tracer);
+		this_tracer = NULL;
+	}
+}
+
+static void bts_trace_stop(struct trace_array *tr)
+{
+	int cpu;
+
+	for_each_cpu_mask(cpu, cpu_possible_map)
+		smp_call_function_single(cpu, bts_trace_stop_cpu, NULL, 1);
+}
+
+static int bts_trace_init(struct trace_array *tr)
+{
+	tracing_reset_online_cpus(tr);
+	bts_trace_start(tr);
+
+	return 0;
+}
+
+static void bts_trace_print_header(struct seq_file *m)
+{
+	seq_puts(m,
+		 "# CPU#        FROM                   TO         FUNCTION\n");
+	seq_puts(m,
+		 "#  |           |                     |             |\n");
+}
+
+static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
+{
+	struct trace_entry *entry = iter->ent;
+	struct trace_seq *seq = &iter->seq;
+	struct hw_branch_entry *it;
+
+	trace_assign_type(it, entry);
+
+	if (entry->type == TRACE_HW_BRANCHES) {
+		if (trace_seq_printf(seq, "%4d  ", entry->cpu) &&
+		    trace_seq_printf(seq, "0x%016llx -> 0x%016llx ",
+				     it->from, it->to) &&
+		    (!it->from ||
+		     seq_print_ip_sym(seq, it->from, /* sym_flags = */ 0)) &&
+		    trace_seq_printf(seq, "\n"))
+			return TRACE_TYPE_HANDLED;
+		return TRACE_TYPE_PARTIAL_LINE;;
+	}
+	return TRACE_TYPE_UNHANDLED;
+}
+
+void trace_hw_branch(struct trace_array *tr, u64 from, u64 to)
+{
+	struct ring_buffer_event *event;
+	struct hw_branch_entry *entry;
+	unsigned long irq;
+
+	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), &irq);
+	if (!event)
+		return;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, 0, from);
+	entry->ent.type = TRACE_HW_BRANCHES;
+	entry->ent.cpu = smp_processor_id();
+	entry->from = from;
+	entry->to   = to;
+	ring_buffer_unlock_commit(tr->buffer, event, irq);
+}
+
+static void trace_bts_at(struct trace_array *tr,
+			 const struct bts_trace *trace, void *at)
+{
+	struct bts_struct bts;
+	int err = 0;
+
+	WARN_ON_ONCE(!trace->read);
+	if (!trace->read)
+		return;
+
+	err = trace->read(this_tracer, at, &bts);
+	if (err < 0)
+		return;
+
+	switch (bts.qualifier) {
+	case BTS_BRANCH:
+		trace_hw_branch(tr, bts.variant.lbr.from, bts.variant.lbr.to);
+		break;
+	}
+}
+
+static void trace_bts_cpu(void *arg)
+{
+	struct trace_array *tr = (struct trace_array *) arg;
+	const struct bts_trace *trace;
+	unsigned char *at;
+
+	if (!this_tracer)
+		return;
+
+	ds_suspend_bts(this_tracer);
+	trace = ds_read_bts(this_tracer);
+	if (!trace)
+		goto out;
+
+	for (at = trace->ds.top; (void *)at < trace->ds.end;
+	     at += trace->ds.size)
+		trace_bts_at(tr, trace, at);
+
+	for (at = trace->ds.begin; (void *)at < trace->ds.top;
+	     at += trace->ds.size)
+		trace_bts_at(tr, trace, at);
+
+out:
+	ds_resume_bts(this_tracer);
+}
+
+static void trace_bts_prepare(struct trace_iterator *iter)
+{
+	int cpu;
+
+	for_each_cpu_mask(cpu, cpu_possible_map)
+		smp_call_function_single(cpu, trace_bts_cpu, iter->tr, 1);
+}
+
+struct tracer bts_tracer __read_mostly =
+{
+	.name		= "hw-branch-tracer",
+	.init		= bts_trace_init,
+	.reset		= bts_trace_stop,
+	.print_header	= bts_trace_print_header,
+	.print_line	= bts_trace_print_line,
+	.start		= bts_trace_start,
+	.stop		= bts_trace_stop,
+	.open		= trace_bts_prepare
+};
+
+__init static int init_bts_trace(void)
+{
+	return register_tracer(&bts_tracer);
+}
+device_initcall(init_bts_trace);
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index ece6cfb649fa..7c2e326bbc8b 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -63,7 +63,7 @@ irq_trace(void)
  */
 static __cacheline_aligned_in_smp	unsigned long max_sequence;
 
-#ifdef CONFIG_FTRACE
+#ifdef CONFIG_FUNCTION_TRACER
 /*
  * irqsoff uses its own tracer function to keep the overhead down:
  */
@@ -95,7 +95,7 @@ irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip)
 	disabled = atomic_inc_return(&data->disabled);
 
 	if (likely(disabled == 1))
-		trace_function(tr, data, ip, parent_ip, flags);
+		trace_function(tr, data, ip, parent_ip, flags, preempt_count());
 
 	atomic_dec(&data->disabled);
 }
@@ -104,7 +104,7 @@ static struct ftrace_ops trace_ops __read_mostly =
 {
 	.func = irqsoff_tracer_call,
 };
-#endif /* CONFIG_FTRACE */
+#endif /* CONFIG_FUNCTION_TRACER */
 
 /*
  * Should this new latency be reported/recorded?
@@ -130,6 +130,7 @@ check_critical_timing(struct trace_array *tr,
 	unsigned long latency, t0, t1;
 	cycle_t T0, T1, delta;
 	unsigned long flags;
+	int pc;
 
 	/*
 	 * usecs conversion is slow so we try to delay the conversion
@@ -141,6 +142,8 @@ check_critical_timing(struct trace_array *tr,
 
 	local_save_flags(flags);
 
+	pc = preempt_count();
+
 	if (!report_latency(delta))
 		goto out;
 
@@ -150,7 +153,7 @@ check_critical_timing(struct trace_array *tr,
 	if (!report_latency(delta))
 		goto out_unlock;
 
-	trace_function(tr, data, CALLER_ADDR0, parent_ip, flags);
+	trace_function(tr, data, CALLER_ADDR0, parent_ip, flags, pc);
 
 	latency = nsecs_to_usecs(delta);
 
@@ -173,8 +176,8 @@ out_unlock:
 out:
 	data->critical_sequence = max_sequence;
 	data->preempt_timestamp = ftrace_now(cpu);
-	tracing_reset(data);
-	trace_function(tr, data, CALLER_ADDR0, parent_ip, flags);
+	tracing_reset(tr, cpu);
+	trace_function(tr, data, CALLER_ADDR0, parent_ip, flags, pc);
 }
 
 static inline void
@@ -203,11 +206,11 @@ start_critical_timing(unsigned long ip, unsigned long parent_ip)
 	data->critical_sequence = max_sequence;
 	data->preempt_timestamp = ftrace_now(cpu);
 	data->critical_start = parent_ip ? : ip;
-	tracing_reset(data);
+	tracing_reset(tr, cpu);
 
 	local_save_flags(flags);
 
-	trace_function(tr, data, ip, parent_ip, flags);
+	trace_function(tr, data, ip, parent_ip, flags, preempt_count());
 
 	per_cpu(tracing_cpu, cpu) = 1;
 
@@ -234,14 +237,14 @@ stop_critical_timing(unsigned long ip, unsigned long parent_ip)
 
 	data = tr->data[cpu];
 
-	if (unlikely(!data) || unlikely(!head_page(data)) ||
+	if (unlikely(!data) ||
 	    !data->critical_start || atomic_read(&data->disabled))
 		return;
 
 	atomic_inc(&data->disabled);
 
 	local_save_flags(flags);
-	trace_function(tr, data, ip, parent_ip, flags);
+	trace_function(tr, data, ip, parent_ip, flags, preempt_count());
 	check_critical_timing(tr, data, parent_ip ? : ip, cpu);
 	data->critical_start = 0;
 	atomic_dec(&data->disabled);
@@ -350,15 +353,28 @@ void trace_preempt_off(unsigned long a0, unsigned long a1)
 }
 #endif /* CONFIG_PREEMPT_TRACER */
 
+/*
+ * save_tracer_enabled is used to save the state of the tracer_enabled
+ * variable when we disable it when we open a trace output file.
+ */
+static int save_tracer_enabled;
+
 static void start_irqsoff_tracer(struct trace_array *tr)
 {
 	register_ftrace_function(&trace_ops);
-	tracer_enabled = 1;
+	if (tracing_is_enabled()) {
+		tracer_enabled = 1;
+		save_tracer_enabled = 1;
+	} else {
+		tracer_enabled = 0;
+		save_tracer_enabled = 0;
+	}
 }
 
 static void stop_irqsoff_tracer(struct trace_array *tr)
 {
 	tracer_enabled = 0;
+	save_tracer_enabled = 0;
 	unregister_ftrace_function(&trace_ops);
 }
 
@@ -367,53 +383,55 @@ static void __irqsoff_tracer_init(struct trace_array *tr)
 	irqsoff_trace = tr;
 	/* make sure that the tracer is visible */
 	smp_wmb();
-
-	if (tr->ctrl)
-		start_irqsoff_tracer(tr);
+	start_irqsoff_tracer(tr);
 }
 
 static void irqsoff_tracer_reset(struct trace_array *tr)
 {
-	if (tr->ctrl)
-		stop_irqsoff_tracer(tr);
+	stop_irqsoff_tracer(tr);
 }
 
-static void irqsoff_tracer_ctrl_update(struct trace_array *tr)
+static void irqsoff_tracer_start(struct trace_array *tr)
 {
-	if (tr->ctrl)
-		start_irqsoff_tracer(tr);
-	else
-		stop_irqsoff_tracer(tr);
+	tracer_enabled = 1;
+	save_tracer_enabled = 1;
+}
+
+static void irqsoff_tracer_stop(struct trace_array *tr)
+{
+	tracer_enabled = 0;
+	save_tracer_enabled = 0;
 }
 
 static void irqsoff_tracer_open(struct trace_iterator *iter)
 {
 	/* stop the trace while dumping */
-	if (iter->tr->ctrl)
-		stop_irqsoff_tracer(iter->tr);
+	tracer_enabled = 0;
 }
 
 static void irqsoff_tracer_close(struct trace_iterator *iter)
 {
-	if (iter->tr->ctrl)
-		start_irqsoff_tracer(iter->tr);
+	/* restart tracing */
+	tracer_enabled = save_tracer_enabled;
 }
 
 #ifdef CONFIG_IRQSOFF_TRACER
-static void irqsoff_tracer_init(struct trace_array *tr)
+static int irqsoff_tracer_init(struct trace_array *tr)
 {
 	trace_type = TRACER_IRQS_OFF;
 
 	__irqsoff_tracer_init(tr);
+	return 0;
 }
 static struct tracer irqsoff_tracer __read_mostly =
 {
 	.name		= "irqsoff",
 	.init		= irqsoff_tracer_init,
 	.reset		= irqsoff_tracer_reset,
+	.start		= irqsoff_tracer_start,
+	.stop		= irqsoff_tracer_stop,
 	.open		= irqsoff_tracer_open,
 	.close		= irqsoff_tracer_close,
-	.ctrl_update	= irqsoff_tracer_ctrl_update,
 	.print_max	= 1,
 #ifdef CONFIG_FTRACE_SELFTEST
 	.selftest    = trace_selftest_startup_irqsoff,
@@ -425,11 +443,12 @@ static struct tracer irqsoff_tracer __read_mostly =
 #endif
 
 #ifdef CONFIG_PREEMPT_TRACER
-static void preemptoff_tracer_init(struct trace_array *tr)
+static int preemptoff_tracer_init(struct trace_array *tr)
 {
 	trace_type = TRACER_PREEMPT_OFF;
 
 	__irqsoff_tracer_init(tr);
+	return 0;
 }
 
 static struct tracer preemptoff_tracer __read_mostly =
@@ -437,9 +456,10 @@ static struct tracer preemptoff_tracer __read_mostly =
 	.name		= "preemptoff",
 	.init		= preemptoff_tracer_init,
 	.reset		= irqsoff_tracer_reset,
+	.start		= irqsoff_tracer_start,
+	.stop		= irqsoff_tracer_stop,
 	.open		= irqsoff_tracer_open,
 	.close		= irqsoff_tracer_close,
-	.ctrl_update	= irqsoff_tracer_ctrl_update,
 	.print_max	= 1,
 #ifdef CONFIG_FTRACE_SELFTEST
 	.selftest    = trace_selftest_startup_preemptoff,
@@ -453,11 +473,12 @@ static struct tracer preemptoff_tracer __read_mostly =
 #if defined(CONFIG_IRQSOFF_TRACER) && \
 	defined(CONFIG_PREEMPT_TRACER)
 
-static void preemptirqsoff_tracer_init(struct trace_array *tr)
+static int preemptirqsoff_tracer_init(struct trace_array *tr)
 {
 	trace_type = TRACER_IRQS_OFF | TRACER_PREEMPT_OFF;
 
 	__irqsoff_tracer_init(tr);
+	return 0;
 }
 
 static struct tracer preemptirqsoff_tracer __read_mostly =
@@ -465,9 +486,10 @@ static struct tracer preemptirqsoff_tracer __read_mostly =
 	.name		= "preemptirqsoff",
 	.init		= preemptirqsoff_tracer_init,
 	.reset		= irqsoff_tracer_reset,
+	.start		= irqsoff_tracer_start,
+	.stop		= irqsoff_tracer_stop,
 	.open		= irqsoff_tracer_open,
 	.close		= irqsoff_tracer_close,
-	.ctrl_update	= irqsoff_tracer_ctrl_update,
 	.print_max	= 1,
 #ifdef CONFIG_FTRACE_SELFTEST
 	.selftest    = trace_selftest_startup_preemptirqsoff,
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index b13dc19dcbb4..fffcb069f1dc 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -18,46 +18,39 @@ struct header_iter {
 
 static struct trace_array *mmio_trace_array;
 static bool overrun_detected;
+static unsigned long prev_overruns;
 
 static void mmio_reset_data(struct trace_array *tr)
 {
-	int cpu;
-
 	overrun_detected = false;
-	tr->time_start = ftrace_now(tr->cpu);
+	prev_overruns = 0;
 
-	for_each_online_cpu(cpu)
-		tracing_reset(tr->data[cpu]);
+	tracing_reset_online_cpus(tr);
 }
 
-static void mmio_trace_init(struct trace_array *tr)
+static int mmio_trace_init(struct trace_array *tr)
 {
 	pr_debug("in %s\n", __func__);
 	mmio_trace_array = tr;
-	if (tr->ctrl) {
-		mmio_reset_data(tr);
-		enable_mmiotrace();
-	}
+
+	mmio_reset_data(tr);
+	enable_mmiotrace();
+	return 0;
 }
 
 static void mmio_trace_reset(struct trace_array *tr)
 {
 	pr_debug("in %s\n", __func__);
-	if (tr->ctrl)
-		disable_mmiotrace();
+
+	disable_mmiotrace();
 	mmio_reset_data(tr);
 	mmio_trace_array = NULL;
 }
 
-static void mmio_trace_ctrl_update(struct trace_array *tr)
+static void mmio_trace_start(struct trace_array *tr)
 {
 	pr_debug("in %s\n", __func__);
-	if (tr->ctrl) {
-		mmio_reset_data(tr);
-		enable_mmiotrace();
-	} else {
-		disable_mmiotrace();
-	}
+	mmio_reset_data(tr);
 }
 
 static int mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev)
@@ -128,12 +121,12 @@ static void mmio_close(struct trace_iterator *iter)
 
 static unsigned long count_overruns(struct trace_iterator *iter)
 {
-	int cpu;
 	unsigned long cnt = 0;
-	for_each_online_cpu(cpu) {
-		cnt += iter->overrun[cpu];
-		iter->overrun[cpu] = 0;
-	}
+	unsigned long over = ring_buffer_overruns(iter->tr->buffer);
+
+	if (over > prev_overruns)
+		cnt = over - prev_overruns;
+	prev_overruns = over;
 	return cnt;
 }
 
@@ -171,17 +164,21 @@ print_out:
 	return (ret == -EBUSY) ? 0 : ret;
 }
 
-static int mmio_print_rw(struct trace_iterator *iter)
+static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
 {
 	struct trace_entry *entry = iter->ent;
-	struct mmiotrace_rw *rw	= &entry->mmiorw;
+	struct trace_mmiotrace_rw *field;
+	struct mmiotrace_rw *rw;
 	struct trace_seq *s	= &iter->seq;
-	unsigned long long t	= ns2usecs(entry->t);
+	unsigned long long t	= ns2usecs(iter->ts);
 	unsigned long usec_rem	= do_div(t, 1000000ULL);
 	unsigned secs		= (unsigned long)t;
 	int ret = 1;
 
-	switch (entry->mmiorw.opcode) {
+	trace_assign_type(field, entry);
+	rw = &field->rw;
+
+	switch (rw->opcode) {
 	case MMIO_READ:
 		ret = trace_seq_printf(s,
 			"R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
@@ -209,21 +206,25 @@ static int mmio_print_rw(struct trace_iterator *iter)
 		break;
 	}
 	if (ret)
-		return 1;
-	return 0;
+		return TRACE_TYPE_HANDLED;
+	return TRACE_TYPE_PARTIAL_LINE;
 }
 
-static int mmio_print_map(struct trace_iterator *iter)
+static enum print_line_t mmio_print_map(struct trace_iterator *iter)
 {
 	struct trace_entry *entry = iter->ent;
-	struct mmiotrace_map *m	= &entry->mmiomap;
+	struct trace_mmiotrace_map *field;
+	struct mmiotrace_map *m;
 	struct trace_seq *s	= &iter->seq;
-	unsigned long long t	= ns2usecs(entry->t);
+	unsigned long long t	= ns2usecs(iter->ts);
 	unsigned long usec_rem	= do_div(t, 1000000ULL);
 	unsigned secs		= (unsigned long)t;
-	int ret = 1;
+	int ret;
 
-	switch (entry->mmiorw.opcode) {
+	trace_assign_type(field, entry);
+	m = &field->map;
+
+	switch (m->opcode) {
 	case MMIO_PROBE:
 		ret = trace_seq_printf(s,
 			"MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
@@ -241,20 +242,43 @@ static int mmio_print_map(struct trace_iterator *iter)
 		break;
 	}
 	if (ret)
-		return 1;
-	return 0;
+		return TRACE_TYPE_HANDLED;
+	return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
+{
+	struct trace_entry *entry = iter->ent;
+	struct print_entry *print = (struct print_entry *)entry;
+	const char *msg		= print->buf;
+	struct trace_seq *s	= &iter->seq;
+	unsigned long long t	= ns2usecs(iter->ts);
+	unsigned long usec_rem	= do_div(t, 1000000ULL);
+	unsigned secs		= (unsigned long)t;
+	int ret;
+
+	/* The trailing newline must be in the message. */
+	ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg);
+	if (!ret)
+		return TRACE_TYPE_PARTIAL_LINE;
+
+	if (entry->flags & TRACE_FLAG_CONT)
+		trace_seq_print_cont(s, iter);
+
+	return TRACE_TYPE_HANDLED;
 }
 
-/* return 0 to abort printing without consuming current entry in pipe mode */
-static int mmio_print_line(struct trace_iterator *iter)
+static enum print_line_t mmio_print_line(struct trace_iterator *iter)
 {
 	switch (iter->ent->type) {
 	case TRACE_MMIO_RW:
 		return mmio_print_rw(iter);
 	case TRACE_MMIO_MAP:
 		return mmio_print_map(iter);
+	case TRACE_PRINT:
+		return mmio_print_mark(iter);
 	default:
-		return 1; /* ignore unknown entries */
+		return TRACE_TYPE_HANDLED; /* ignore unknown entries */
 	}
 }
 
@@ -263,10 +287,10 @@ static struct tracer mmio_tracer __read_mostly =
 	.name		= "mmiotrace",
 	.init		= mmio_trace_init,
 	.reset		= mmio_trace_reset,
+	.start		= mmio_trace_start,
 	.pipe_open	= mmio_pipe_open,
 	.close		= mmio_close,
 	.read		= mmio_read,
-	.ctrl_update	= mmio_trace_ctrl_update,
 	.print_line	= mmio_print_line,
 };
 
@@ -276,6 +300,27 @@ __init static int init_mmio_trace(void)
 }
 device_initcall(init_mmio_trace);
 
+static void __trace_mmiotrace_rw(struct trace_array *tr,
+				struct trace_array_cpu *data,
+				struct mmiotrace_rw *rw)
+{
+	struct ring_buffer_event *event;
+	struct trace_mmiotrace_rw *entry;
+	unsigned long irq_flags;
+
+	event	= ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+					   &irq_flags);
+	if (!event)
+		return;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, 0, preempt_count());
+	entry->ent.type			= TRACE_MMIO_RW;
+	entry->rw			= *rw;
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+	trace_wake_up();
+}
+
 void mmio_trace_rw(struct mmiotrace_rw *rw)
 {
 	struct trace_array *tr = mmio_trace_array;
@@ -283,6 +328,27 @@ void mmio_trace_rw(struct mmiotrace_rw *rw)
 	__trace_mmiotrace_rw(tr, data, rw);
 }
 
+static void __trace_mmiotrace_map(struct trace_array *tr,
+				struct trace_array_cpu *data,
+				struct mmiotrace_map *map)
+{
+	struct ring_buffer_event *event;
+	struct trace_mmiotrace_map *entry;
+	unsigned long irq_flags;
+
+	event	= ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+					   &irq_flags);
+	if (!event)
+		return;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, 0, preempt_count());
+	entry->ent.type			= TRACE_MMIO_MAP;
+	entry->map			= *map;
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+	trace_wake_up();
+}
+
 void mmio_trace_mapping(struct mmiotrace_map *map)
 {
 	struct trace_array *tr = mmio_trace_array;
@@ -293,3 +359,8 @@ void mmio_trace_mapping(struct mmiotrace_map *map)
 	__trace_mmiotrace_map(tr, data, map);
 	preempt_enable();
 }
+
+int mmio_trace_printk(const char *fmt, va_list args)
+{
+	return trace_vprintk(0, -1, fmt, args);
+}
diff --git a/kernel/trace/trace_nop.c b/kernel/trace/trace_nop.c
new file mode 100644
index 000000000000..b9767acd30ac
--- /dev/null
+++ b/kernel/trace/trace_nop.c
@@ -0,0 +1,105 @@
+/*
+ * nop tracer
+ *
+ * Copyright (C) 2008 Steven Noonan <steven@uplinklabs.net>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <linux/ftrace.h>
+
+#include "trace.h"
+
+/* Our two options */
+enum {
+	TRACE_NOP_OPT_ACCEPT = 0x1,
+	TRACE_NOP_OPT_REFUSE = 0x2
+};
+
+/* Options for the tracer (see trace_options file) */
+static struct tracer_opt nop_opts[] = {
+	/* Option that will be accepted by set_flag callback */
+	{ TRACER_OPT(test_nop_accept, TRACE_NOP_OPT_ACCEPT) },
+	/* Option that will be refused by set_flag callback */
+	{ TRACER_OPT(test_nop_refuse, TRACE_NOP_OPT_REFUSE) },
+	{ } /* Always set a last empty entry */
+};
+
+static struct tracer_flags nop_flags = {
+	/* You can check your flags value here when you want. */
+	.val = 0, /* By default: all flags disabled */
+	.opts = nop_opts
+};
+
+static struct trace_array	*ctx_trace;
+
+static void start_nop_trace(struct trace_array *tr)
+{
+	/* Nothing to do! */
+}
+
+static void stop_nop_trace(struct trace_array *tr)
+{
+	/* Nothing to do! */
+}
+
+static int nop_trace_init(struct trace_array *tr)
+{
+	int cpu;
+	ctx_trace = tr;
+
+	for_each_online_cpu(cpu)
+		tracing_reset(tr, cpu);
+
+	start_nop_trace(tr);
+	return 0;
+}
+
+static void nop_trace_reset(struct trace_array *tr)
+{
+	stop_nop_trace(tr);
+}
+
+/* It only serves as a signal handler and a callback to
+ * accept or refuse tthe setting of a flag.
+ * If you don't implement it, then the flag setting will be
+ * automatically accepted.
+ */
+static int nop_set_flag(u32 old_flags, u32 bit, int set)
+{
+	/*
+	 * Note that you don't need to update nop_flags.val yourself.
+	 * The tracing Api will do it automatically if you return 0
+	 */
+	if (bit == TRACE_NOP_OPT_ACCEPT) {
+		printk(KERN_DEBUG "nop_test_accept flag set to %d: we accept."
+			" Now cat trace_options to see the result\n",
+			set);
+		return 0;
+	}
+
+	if (bit == TRACE_NOP_OPT_REFUSE) {
+		printk(KERN_DEBUG "nop_test_refuse flag set to %d: we refuse."
+			"Now cat trace_options to see the result\n",
+			set);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+
+struct tracer nop_trace __read_mostly =
+{
+	.name		= "nop",
+	.init		= nop_trace_init,
+	.reset		= nop_trace_reset,
+#ifdef CONFIG_FTRACE_SELFTEST
+	.selftest	= trace_selftest_startup_nop,
+#endif
+	.flags		= &nop_flags,
+	.set_flag	= nop_set_flag
+};
+
diff --git a/kernel/trace/trace_power.c b/kernel/trace/trace_power.c
new file mode 100644
index 000000000000..a7172a352f62
--- /dev/null
+++ b/kernel/trace/trace_power.c
@@ -0,0 +1,179 @@
+/*
+ * ring buffer based C-state tracer
+ *
+ * Arjan van de Ven <arjan@linux.intel.com>
+ * Copyright (C) 2008 Intel Corporation
+ *
+ * Much is borrowed from trace_boot.c which is
+ * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/debugfs.h>
+#include <linux/ftrace.h>
+#include <linux/kallsyms.h>
+#include <linux/module.h>
+
+#include "trace.h"
+
+static struct trace_array *power_trace;
+static int __read_mostly trace_power_enabled;
+
+
+static void start_power_trace(struct trace_array *tr)
+{
+	trace_power_enabled = 1;
+}
+
+static void stop_power_trace(struct trace_array *tr)
+{
+	trace_power_enabled = 0;
+}
+
+
+static int power_trace_init(struct trace_array *tr)
+{
+	int cpu;
+	power_trace = tr;
+
+	trace_power_enabled = 1;
+
+	for_each_cpu_mask(cpu, cpu_possible_map)
+		tracing_reset(tr, cpu);
+	return 0;
+}
+
+static enum print_line_t power_print_line(struct trace_iterator *iter)
+{
+	int ret = 0;
+	struct trace_entry *entry = iter->ent;
+	struct trace_power *field ;
+	struct power_trace *it;
+	struct trace_seq *s = &iter->seq;
+	struct timespec stamp;
+	struct timespec duration;
+
+	trace_assign_type(field, entry);
+	it = &field->state_data;
+	stamp = ktime_to_timespec(it->stamp);
+	duration = ktime_to_timespec(ktime_sub(it->end, it->stamp));
+
+	if (entry->type == TRACE_POWER) {
+		if (it->type == POWER_CSTATE)
+			ret = trace_seq_printf(s, "[%5ld.%09ld] CSTATE: Going to C%i on cpu %i for %ld.%09ld\n",
+					  stamp.tv_sec,
+					  stamp.tv_nsec,
+					  it->state, iter->cpu,
+					  duration.tv_sec,
+					  duration.tv_nsec);
+		if (it->type == POWER_PSTATE)
+			ret = trace_seq_printf(s, "[%5ld.%09ld] PSTATE: Going to P%i on cpu %i\n",
+					  stamp.tv_sec,
+					  stamp.tv_nsec,
+					  it->state, iter->cpu);
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+		return TRACE_TYPE_HANDLED;
+	}
+	return TRACE_TYPE_UNHANDLED;
+}
+
+static struct tracer power_tracer __read_mostly =
+{
+	.name		= "power",
+	.init		= power_trace_init,
+	.start		= start_power_trace,
+	.stop		= stop_power_trace,
+	.reset		= stop_power_trace,
+	.print_line	= power_print_line,
+};
+
+static int init_power_trace(void)
+{
+	return register_tracer(&power_tracer);
+}
+device_initcall(init_power_trace);
+
+void trace_power_start(struct power_trace *it, unsigned int type,
+			 unsigned int level)
+{
+	if (!trace_power_enabled)
+		return;
+
+	memset(it, 0, sizeof(struct power_trace));
+	it->state = level;
+	it->type = type;
+	it->stamp = ktime_get();
+}
+EXPORT_SYMBOL_GPL(trace_power_start);
+
+
+void trace_power_end(struct power_trace *it)
+{
+	struct ring_buffer_event *event;
+	struct trace_power *entry;
+	struct trace_array_cpu *data;
+	unsigned long irq_flags;
+	struct trace_array *tr = power_trace;
+
+	if (!trace_power_enabled)
+		return;
+
+	preempt_disable();
+	it->end = ktime_get();
+	data = tr->data[smp_processor_id()];
+
+	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+					 &irq_flags);
+	if (!event)
+		goto out;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, 0, 0);
+	entry->ent.type = TRACE_POWER;
+	entry->state_data = *it;
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+	trace_wake_up();
+
+ out:
+	preempt_enable();
+}
+EXPORT_SYMBOL_GPL(trace_power_end);
+
+void trace_power_mark(struct power_trace *it, unsigned int type,
+			 unsigned int level)
+{
+	struct ring_buffer_event *event;
+	struct trace_power *entry;
+	struct trace_array_cpu *data;
+	unsigned long irq_flags;
+	struct trace_array *tr = power_trace;
+
+	if (!trace_power_enabled)
+		return;
+
+	memset(it, 0, sizeof(struct power_trace));
+	it->state = level;
+	it->type = type;
+	it->stamp = ktime_get();
+	preempt_disable();
+	it->end = it->stamp;
+	data = tr->data[smp_processor_id()];
+
+	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+					 &irq_flags);
+	if (!event)
+		goto out;
+	entry	= ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, 0, 0);
+	entry->ent.type = TRACE_POWER;
+	entry->state_data = *it;
+	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+	trace_wake_up();
+
+ out:
+	preempt_enable();
+}
+EXPORT_SYMBOL_GPL(trace_power_mark);
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index cb817a209aa0..df175cb4564f 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -9,25 +9,27 @@
 #include <linux/debugfs.h>
 #include <linux/kallsyms.h>
 #include <linux/uaccess.h>
-#include <linux/marker.h>
 #include <linux/ftrace.h>
+#include <trace/sched.h>
 
 #include "trace.h"
 
 static struct trace_array	*ctx_trace;
 static int __read_mostly	tracer_enabled;
-static atomic_t			sched_ref;
+static int			sched_ref;
+static DEFINE_MUTEX(sched_register_mutex);
 
 static void
-sched_switch_func(void *private, void *__rq, struct task_struct *prev,
+probe_sched_switch(struct rq *__rq, struct task_struct *prev,
 			struct task_struct *next)
 {
-	struct trace_array **ptr = private;
-	struct trace_array *tr = *ptr;
 	struct trace_array_cpu *data;
 	unsigned long flags;
-	long disabled;
 	int cpu;
+	int pc;
+
+	if (!sched_ref)
+		return;
 
 	tracing_record_cmdline(prev);
 	tracing_record_cmdline(next);
@@ -35,183 +37,95 @@ sched_switch_func(void *private, void *__rq, struct task_struct *prev,
 	if (!tracer_enabled)
 		return;
 
+	pc = preempt_count();
 	local_irq_save(flags);
 	cpu = raw_smp_processor_id();
-	data = tr->data[cpu];
-	disabled = atomic_inc_return(&data->disabled);
+	data = ctx_trace->data[cpu];
 
-	if (likely(disabled == 1))
-		tracing_sched_switch_trace(tr, data, prev, next, flags);
+	if (likely(!atomic_read(&data->disabled)))
+		tracing_sched_switch_trace(ctx_trace, data, prev, next, flags, pc);
 
-	atomic_dec(&data->disabled);
 	local_irq_restore(flags);
 }
 
-static notrace void
-sched_switch_callback(void *probe_data, void *call_data,
-		      const char *format, va_list *args)
-{
-	struct task_struct *prev;
-	struct task_struct *next;
-	struct rq *__rq;
-
-	if (!atomic_read(&sched_ref))
-		return;
-
-	/* skip prev_pid %d next_pid %d prev_state %ld */
-	(void)va_arg(*args, int);
-	(void)va_arg(*args, int);
-	(void)va_arg(*args, long);
-	__rq = va_arg(*args, typeof(__rq));
-	prev = va_arg(*args, typeof(prev));
-	next = va_arg(*args, typeof(next));
-
-	/*
-	 * If tracer_switch_func only points to the local
-	 * switch func, it still needs the ptr passed to it.
-	 */
-	sched_switch_func(probe_data, __rq, prev, next);
-}
-
 static void
-wakeup_func(void *private, void *__rq, struct task_struct *wakee, struct
-			task_struct *curr)
+probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee, int success)
 {
-	struct trace_array **ptr = private;
-	struct trace_array *tr = *ptr;
 	struct trace_array_cpu *data;
 	unsigned long flags;
-	long disabled;
-	int cpu;
+	int cpu, pc;
 
-	if (!tracer_enabled)
+	if (!likely(tracer_enabled))
 		return;
 
-	tracing_record_cmdline(curr);
+	pc = preempt_count();
+	tracing_record_cmdline(current);
 
 	local_irq_save(flags);
 	cpu = raw_smp_processor_id();
-	data = tr->data[cpu];
-	disabled = atomic_inc_return(&data->disabled);
+	data = ctx_trace->data[cpu];
 
-	if (likely(disabled == 1))
-		tracing_sched_wakeup_trace(tr, data, wakee, curr, flags);
+	if (likely(!atomic_read(&data->disabled)))
+		tracing_sched_wakeup_trace(ctx_trace, data, wakee, current,
+					   flags, pc);
 
-	atomic_dec(&data->disabled);
 	local_irq_restore(flags);
 }
 
-static notrace void
-wake_up_callback(void *probe_data, void *call_data,
-		 const char *format, va_list *args)
-{
-	struct task_struct *curr;
-	struct task_struct *task;
-	struct rq *__rq;
-
-	if (likely(!tracer_enabled))
-		return;
-
-	/* Skip pid %d state %ld */
-	(void)va_arg(*args, int);
-	(void)va_arg(*args, long);
-	/* now get the meat: "rq %p task %p rq->curr %p" */
-	__rq = va_arg(*args, typeof(__rq));
-	task = va_arg(*args, typeof(task));
-	curr = va_arg(*args, typeof(curr));
-
-	tracing_record_cmdline(task);
-	tracing_record_cmdline(curr);
-
-	wakeup_func(probe_data, __rq, task, curr);
-}
-
-static void sched_switch_reset(struct trace_array *tr)
-{
-	int cpu;
-
-	tr->time_start = ftrace_now(tr->cpu);
-
-	for_each_online_cpu(cpu)
-		tracing_reset(tr->data[cpu]);
-}
-
 static int tracing_sched_register(void)
 {
 	int ret;
 
-	ret = marker_probe_register("kernel_sched_wakeup",
-			"pid %d state %ld ## rq %p task %p rq->curr %p",
-			wake_up_callback,
-			&ctx_trace);
+	ret = register_trace_sched_wakeup(probe_sched_wakeup);
 	if (ret) {
-		pr_info("wakeup trace: Couldn't add marker"
+		pr_info("wakeup trace: Couldn't activate tracepoint"
 			" probe to kernel_sched_wakeup\n");
 		return ret;
 	}
 
-	ret = marker_probe_register("kernel_sched_wakeup_new",
-			"pid %d state %ld ## rq %p task %p rq->curr %p",
-			wake_up_callback,
-			&ctx_trace);
+	ret = register_trace_sched_wakeup_new(probe_sched_wakeup);
 	if (ret) {
-		pr_info("wakeup trace: Couldn't add marker"
+		pr_info("wakeup trace: Couldn't activate tracepoint"
 			" probe to kernel_sched_wakeup_new\n");
 		goto fail_deprobe;
 	}
 
-	ret = marker_probe_register("kernel_sched_schedule",
-		"prev_pid %d next_pid %d prev_state %ld "
-		"## rq %p prev %p next %p",
-		sched_switch_callback,
-		&ctx_trace);
+	ret = register_trace_sched_switch(probe_sched_switch);
 	if (ret) {
-		pr_info("sched trace: Couldn't add marker"
+		pr_info("sched trace: Couldn't activate tracepoint"
 			" probe to kernel_sched_schedule\n");
 		goto fail_deprobe_wake_new;
 	}
 
 	return ret;
 fail_deprobe_wake_new:
-	marker_probe_unregister("kernel_sched_wakeup_new",
-				wake_up_callback,
-				&ctx_trace);
+	unregister_trace_sched_wakeup_new(probe_sched_wakeup);
 fail_deprobe:
-	marker_probe_unregister("kernel_sched_wakeup",
-				wake_up_callback,
-				&ctx_trace);
+	unregister_trace_sched_wakeup(probe_sched_wakeup);
 	return ret;
 }
 
 static void tracing_sched_unregister(void)
 {
-	marker_probe_unregister("kernel_sched_schedule",
-				sched_switch_callback,
-				&ctx_trace);
-	marker_probe_unregister("kernel_sched_wakeup_new",
-				wake_up_callback,
-				&ctx_trace);
-	marker_probe_unregister("kernel_sched_wakeup",
-				wake_up_callback,
-				&ctx_trace);
+	unregister_trace_sched_switch(probe_sched_switch);
+	unregister_trace_sched_wakeup_new(probe_sched_wakeup);
+	unregister_trace_sched_wakeup(probe_sched_wakeup);
 }
 
 static void tracing_start_sched_switch(void)
 {
-	long ref;
-
-	ref = atomic_inc_return(&sched_ref);
-	if (ref == 1)
+	mutex_lock(&sched_register_mutex);
+	if (!(sched_ref++))
 		tracing_sched_register();
+	mutex_unlock(&sched_register_mutex);
 }
 
 static void tracing_stop_sched_switch(void)
 {
-	long ref;
-
-	ref = atomic_dec_and_test(&sched_ref);
-	if (ref)
+	mutex_lock(&sched_register_mutex);
+	if (!(--sched_ref))
 		tracing_sched_unregister();
+	mutex_unlock(&sched_register_mutex);
 }
 
 void tracing_start_cmdline_record(void)
@@ -224,40 +138,86 @@ void tracing_stop_cmdline_record(void)
 	tracing_stop_sched_switch();
 }
 
+/**
+ * tracing_start_sched_switch_record - start tracing context switches
+ *
+ * Turns on context switch tracing for a tracer.
+ */
+void tracing_start_sched_switch_record(void)
+{
+	if (unlikely(!ctx_trace)) {
+		WARN_ON(1);
+		return;
+	}
+
+	tracing_start_sched_switch();
+
+	mutex_lock(&sched_register_mutex);
+	tracer_enabled++;
+	mutex_unlock(&sched_register_mutex);
+}
+
+/**
+ * tracing_stop_sched_switch_record - start tracing context switches
+ *
+ * Turns off context switch tracing for a tracer.
+ */
+void tracing_stop_sched_switch_record(void)
+{
+	mutex_lock(&sched_register_mutex);
+	tracer_enabled--;
+	WARN_ON(tracer_enabled < 0);
+	mutex_unlock(&sched_register_mutex);
+
+	tracing_stop_sched_switch();
+}
+
+/**
+ * tracing_sched_switch_assign_trace - assign a trace array for ctx switch
+ * @tr: trace array pointer to assign
+ *
+ * Some tracers might want to record the context switches in their
+ * trace. This function lets those tracers assign the trace array
+ * to use.
+ */
+void tracing_sched_switch_assign_trace(struct trace_array *tr)
+{
+	ctx_trace = tr;
+}
+
 static void start_sched_trace(struct trace_array *tr)
 {
-	sched_switch_reset(tr);
-	tracing_start_cmdline_record();
-	tracer_enabled = 1;
+	tracing_reset_online_cpus(tr);
+	tracing_start_sched_switch_record();
 }
 
 static void stop_sched_trace(struct trace_array *tr)
 {
-	tracer_enabled = 0;
-	tracing_stop_cmdline_record();
+	tracing_stop_sched_switch_record();
 }
 
-static void sched_switch_trace_init(struct trace_array *tr)
+static int sched_switch_trace_init(struct trace_array *tr)
 {
 	ctx_trace = tr;
-
-	if (tr->ctrl)
-		start_sched_trace(tr);
+	start_sched_trace(tr);
+	return 0;
 }
 
 static void sched_switch_trace_reset(struct trace_array *tr)
 {
-	if (tr->ctrl)
+	if (sched_ref)
 		stop_sched_trace(tr);
 }
 
-static void sched_switch_trace_ctrl_update(struct trace_array *tr)
+static void sched_switch_trace_start(struct trace_array *tr)
 {
-	/* When starting a new trace, reset the buffers */
-	if (tr->ctrl)
-		start_sched_trace(tr);
-	else
-		stop_sched_trace(tr);
+	tracing_reset_online_cpus(tr);
+	tracing_start_sched_switch();
+}
+
+static void sched_switch_trace_stop(struct trace_array *tr)
+{
+	tracing_stop_sched_switch();
 }
 
 static struct tracer sched_switch_trace __read_mostly =
@@ -265,7 +225,8 @@ static struct tracer sched_switch_trace __read_mostly =
 	.name		= "sched_switch",
 	.init		= sched_switch_trace_init,
 	.reset		= sched_switch_trace_reset,
-	.ctrl_update	= sched_switch_trace_ctrl_update,
+	.start		= sched_switch_trace_start,
+	.stop		= sched_switch_trace_stop,
 #ifdef CONFIG_FTRACE_SELFTEST
 	.selftest    = trace_selftest_startup_sched_switch,
 #endif
@@ -273,14 +234,7 @@ static struct tracer sched_switch_trace __read_mostly =
 
 __init static int init_sched_switch_trace(void)
 {
-	int ret = 0;
-
-	if (atomic_read(&sched_ref))
-		ret = tracing_sched_register();
-	if (ret) {
-		pr_info("error registering scheduler trace\n");
-		return ret;
-	}
 	return register_tracer(&sched_switch_trace);
 }
 device_initcall(init_sched_switch_trace);
+
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index e303ccb62cdf..43586b689e31 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -15,7 +15,7 @@
 #include <linux/kallsyms.h>
 #include <linux/uaccess.h>
 #include <linux/ftrace.h>
-#include <linux/marker.h>
+#include <trace/sched.h>
 
 #include "trace.h"
 
@@ -31,7 +31,7 @@ static raw_spinlock_t wakeup_lock =
 
 static void __wakeup_reset(struct trace_array *tr);
 
-#ifdef CONFIG_FTRACE
+#ifdef CONFIG_FUNCTION_TRACER
 /*
  * irqsoff uses its own tracer function to keep the overhead down:
  */
@@ -44,12 +44,13 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
 	long disabled;
 	int resched;
 	int cpu;
+	int pc;
 
 	if (likely(!wakeup_task))
 		return;
 
-	resched = need_resched();
-	preempt_disable_notrace();
+	pc = preempt_count();
+	resched = ftrace_preempt_disable();
 
 	cpu = raw_smp_processor_id();
 	data = tr->data[cpu];
@@ -70,7 +71,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
 	if (task_cpu(wakeup_task) != cpu)
 		goto unlock;
 
-	trace_function(tr, data, ip, parent_ip, flags);
+	trace_function(tr, data, ip, parent_ip, flags, pc);
 
  unlock:
 	__raw_spin_unlock(&wakeup_lock);
@@ -79,22 +80,14 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
  out:
 	atomic_dec(&data->disabled);
 
-	/*
-	 * To prevent recursion from the scheduler, if the
-	 * resched flag was set before we entered, then
-	 * don't reschedule.
-	 */
-	if (resched)
-		preempt_enable_no_resched_notrace();
-	else
-		preempt_enable_notrace();
+	ftrace_preempt_enable(resched);
 }
 
 static struct ftrace_ops trace_ops __read_mostly =
 {
 	.func = wakeup_tracer_call,
 };
-#endif /* CONFIG_FTRACE */
+#endif /* CONFIG_FUNCTION_TRACER */
 
 /*
  * Should this new latency be reported/recorded?
@@ -112,17 +105,18 @@ static int report_latency(cycle_t delta)
 }
 
 static void notrace
-wakeup_sched_switch(void *private, void *rq, struct task_struct *prev,
+probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
 	struct task_struct *next)
 {
 	unsigned long latency = 0, t0 = 0, t1 = 0;
-	struct trace_array **ptr = private;
-	struct trace_array *tr = *ptr;
 	struct trace_array_cpu *data;
 	cycle_t T0, T1, delta;
 	unsigned long flags;
 	long disabled;
 	int cpu;
+	int pc;
+
+	tracing_record_cmdline(prev);
 
 	if (unlikely(!tracer_enabled))
 		return;
@@ -139,12 +133,14 @@ wakeup_sched_switch(void *private, void *rq, struct task_struct *prev,
 	if (next != wakeup_task)
 		return;
 
+	pc = preempt_count();
+
 	/* The task we are waiting for is waking up */
-	data = tr->data[wakeup_cpu];
+	data = wakeup_trace->data[wakeup_cpu];
 
 	/* disable local data, not wakeup_cpu data */
 	cpu = raw_smp_processor_id();
-	disabled = atomic_inc_return(&tr->data[cpu]->disabled);
+	disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled);
 	if (likely(disabled != 1))
 		goto out;
 
@@ -155,7 +151,7 @@ wakeup_sched_switch(void *private, void *rq, struct task_struct *prev,
 	if (unlikely(!tracer_enabled || next != wakeup_task))
 		goto out_unlock;
 
-	trace_function(tr, data, CALLER_ADDR1, CALLER_ADDR2, flags);
+	trace_function(wakeup_trace, data, CALLER_ADDR1, CALLER_ADDR2, flags, pc);
 
 	/*
 	 * usecs conversion is slow so we try to delay the conversion
@@ -174,39 +170,14 @@ wakeup_sched_switch(void *private, void *rq, struct task_struct *prev,
 	t0 = nsecs_to_usecs(T0);
 	t1 = nsecs_to_usecs(T1);
 
-	update_max_tr(tr, wakeup_task, wakeup_cpu);
+	update_max_tr(wakeup_trace, wakeup_task, wakeup_cpu);
 
 out_unlock:
-	__wakeup_reset(tr);
+	__wakeup_reset(wakeup_trace);
 	__raw_spin_unlock(&wakeup_lock);
 	local_irq_restore(flags);
 out:
-	atomic_dec(&tr->data[cpu]->disabled);
-}
-
-static notrace void
-sched_switch_callback(void *probe_data, void *call_data,
-		      const char *format, va_list *args)
-{
-	struct task_struct *prev;
-	struct task_struct *next;
-	struct rq *__rq;
-
-	/* skip prev_pid %d next_pid %d prev_state %ld */
-	(void)va_arg(*args, int);
-	(void)va_arg(*args, int);
-	(void)va_arg(*args, long);
-	__rq = va_arg(*args, typeof(__rq));
-	prev = va_arg(*args, typeof(prev));
-	next = va_arg(*args, typeof(next));
-
-	tracing_record_cmdline(prev);
-
-	/*
-	 * If tracer_switch_func only points to the local
-	 * switch func, it still needs the ptr passed to it.
-	 */
-	wakeup_sched_switch(probe_data, __rq, prev, next);
+	atomic_dec(&wakeup_trace->data[cpu]->disabled);
 }
 
 static void __wakeup_reset(struct trace_array *tr)
@@ -216,7 +187,7 @@ static void __wakeup_reset(struct trace_array *tr)
 
 	for_each_possible_cpu(cpu) {
 		data = tr->data[cpu];
-		tracing_reset(data);
+		tracing_reset(tr, cpu);
 	}
 
 	wakeup_cpu = -1;
@@ -240,19 +211,26 @@ static void wakeup_reset(struct trace_array *tr)
 }
 
 static void
-wakeup_check_start(struct trace_array *tr, struct task_struct *p,
-		   struct task_struct *curr)
+probe_wakeup(struct rq *rq, struct task_struct *p, int success)
 {
 	int cpu = smp_processor_id();
 	unsigned long flags;
 	long disabled;
+	int pc;
+
+	if (likely(!tracer_enabled))
+		return;
+
+	tracing_record_cmdline(p);
+	tracing_record_cmdline(current);
 
 	if (likely(!rt_task(p)) ||
 			p->prio >= wakeup_prio ||
-			p->prio >= curr->prio)
+			p->prio >= current->prio)
 		return;
 
-	disabled = atomic_inc_return(&tr->data[cpu]->disabled);
+	pc = preempt_count();
+	disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled);
 	if (unlikely(disabled != 1))
 		goto out;
 
@@ -264,7 +242,7 @@ wakeup_check_start(struct trace_array *tr, struct task_struct *p,
 		goto out_locked;
 
 	/* reset the trace */
-	__wakeup_reset(tr);
+	__wakeup_reset(wakeup_trace);
 
 	wakeup_cpu = task_cpu(p);
 	wakeup_prio = p->prio;
@@ -274,74 +252,43 @@ wakeup_check_start(struct trace_array *tr, struct task_struct *p,
 
 	local_save_flags(flags);
 
-	tr->data[wakeup_cpu]->preempt_timestamp = ftrace_now(cpu);
-	trace_function(tr, tr->data[wakeup_cpu],
-		       CALLER_ADDR1, CALLER_ADDR2, flags);
+	wakeup_trace->data[wakeup_cpu]->preempt_timestamp = ftrace_now(cpu);
+	trace_function(wakeup_trace, wakeup_trace->data[wakeup_cpu],
+		       CALLER_ADDR1, CALLER_ADDR2, flags, pc);
 
 out_locked:
 	__raw_spin_unlock(&wakeup_lock);
 out:
-	atomic_dec(&tr->data[cpu]->disabled);
+	atomic_dec(&wakeup_trace->data[cpu]->disabled);
 }
 
-static notrace void
-wake_up_callback(void *probe_data, void *call_data,
-		 const char *format, va_list *args)
-{
-	struct trace_array **ptr = probe_data;
-	struct trace_array *tr = *ptr;
-	struct task_struct *curr;
-	struct task_struct *task;
-	struct rq *__rq;
-
-	if (likely(!tracer_enabled))
-		return;
-
-	/* Skip pid %d state %ld */
-	(void)va_arg(*args, int);
-	(void)va_arg(*args, long);
-	/* now get the meat: "rq %p task %p rq->curr %p" */
-	__rq = va_arg(*args, typeof(__rq));
-	task = va_arg(*args, typeof(task));
-	curr = va_arg(*args, typeof(curr));
-
-	tracing_record_cmdline(task);
-	tracing_record_cmdline(curr);
-
-	wakeup_check_start(tr, task, curr);
-}
+/*
+ * save_tracer_enabled is used to save the state of the tracer_enabled
+ * variable when we disable it when we open a trace output file.
+ */
+static int save_tracer_enabled;
 
 static void start_wakeup_tracer(struct trace_array *tr)
 {
 	int ret;
 
-	ret = marker_probe_register("kernel_sched_wakeup",
-			"pid %d state %ld ## rq %p task %p rq->curr %p",
-			wake_up_callback,
-			&wakeup_trace);
+	ret = register_trace_sched_wakeup(probe_wakeup);
 	if (ret) {
-		pr_info("wakeup trace: Couldn't add marker"
+		pr_info("wakeup trace: Couldn't activate tracepoint"
 			" probe to kernel_sched_wakeup\n");
 		return;
 	}
 
-	ret = marker_probe_register("kernel_sched_wakeup_new",
-			"pid %d state %ld ## rq %p task %p rq->curr %p",
-			wake_up_callback,
-			&wakeup_trace);
+	ret = register_trace_sched_wakeup_new(probe_wakeup);
 	if (ret) {
-		pr_info("wakeup trace: Couldn't add marker"
+		pr_info("wakeup trace: Couldn't activate tracepoint"
 			" probe to kernel_sched_wakeup_new\n");
 		goto fail_deprobe;
 	}
 
-	ret = marker_probe_register("kernel_sched_schedule",
-		"prev_pid %d next_pid %d prev_state %ld "
-		"## rq %p prev %p next %p",
-		sched_switch_callback,
-		&wakeup_trace);
+	ret = register_trace_sched_switch(probe_wakeup_sched_switch);
 	if (ret) {
-		pr_info("sched trace: Couldn't add marker"
+		pr_info("sched trace: Couldn't activate tracepoint"
 			" probe to kernel_sched_schedule\n");
 		goto fail_deprobe_wake_new;
 	}
@@ -359,71 +306,71 @@ static void start_wakeup_tracer(struct trace_array *tr)
 
 	register_ftrace_function(&trace_ops);
 
-	tracer_enabled = 1;
+	if (tracing_is_enabled()) {
+		tracer_enabled = 1;
+		save_tracer_enabled = 1;
+	} else {
+		tracer_enabled = 0;
+		save_tracer_enabled = 0;
+	}
 
 	return;
 fail_deprobe_wake_new:
-	marker_probe_unregister("kernel_sched_wakeup_new",
-				wake_up_callback,
-				&wakeup_trace);
+	unregister_trace_sched_wakeup_new(probe_wakeup);
 fail_deprobe:
-	marker_probe_unregister("kernel_sched_wakeup",
-				wake_up_callback,
-				&wakeup_trace);
+	unregister_trace_sched_wakeup(probe_wakeup);
 }
 
 static void stop_wakeup_tracer(struct trace_array *tr)
 {
 	tracer_enabled = 0;
+	save_tracer_enabled = 0;
 	unregister_ftrace_function(&trace_ops);
-	marker_probe_unregister("kernel_sched_schedule",
-				sched_switch_callback,
-				&wakeup_trace);
-	marker_probe_unregister("kernel_sched_wakeup_new",
-				wake_up_callback,
-				&wakeup_trace);
-	marker_probe_unregister("kernel_sched_wakeup",
-				wake_up_callback,
-				&wakeup_trace);
+	unregister_trace_sched_switch(probe_wakeup_sched_switch);
+	unregister_trace_sched_wakeup_new(probe_wakeup);
+	unregister_trace_sched_wakeup(probe_wakeup);
 }
 
-static void wakeup_tracer_init(struct trace_array *tr)
+static int wakeup_tracer_init(struct trace_array *tr)
 {
 	wakeup_trace = tr;
-
-	if (tr->ctrl)
-		start_wakeup_tracer(tr);
+	start_wakeup_tracer(tr);
+	return 0;
 }
 
 static void wakeup_tracer_reset(struct trace_array *tr)
 {
-	if (tr->ctrl) {
-		stop_wakeup_tracer(tr);
-		/* make sure we put back any tasks we are tracing */
-		wakeup_reset(tr);
-	}
+	stop_wakeup_tracer(tr);
+	/* make sure we put back any tasks we are tracing */
+	wakeup_reset(tr);
 }
 
-static void wakeup_tracer_ctrl_update(struct trace_array *tr)
+static void wakeup_tracer_start(struct trace_array *tr)
 {
-	if (tr->ctrl)
-		start_wakeup_tracer(tr);
-	else
-		stop_wakeup_tracer(tr);
+	wakeup_reset(tr);
+	tracer_enabled = 1;
+	save_tracer_enabled = 1;
+}
+
+static void wakeup_tracer_stop(struct trace_array *tr)
+{
+	tracer_enabled = 0;
+	save_tracer_enabled = 0;
 }
 
 static void wakeup_tracer_open(struct trace_iterator *iter)
 {
 	/* stop the trace while dumping */
-	if (iter->tr->ctrl)
-		stop_wakeup_tracer(iter->tr);
+	tracer_enabled = 0;
 }
 
 static void wakeup_tracer_close(struct trace_iterator *iter)
 {
 	/* forget about any processes we were recording */
-	if (iter->tr->ctrl)
-		start_wakeup_tracer(iter->tr);
+	if (save_tracer_enabled) {
+		wakeup_reset(iter->tr);
+		tracer_enabled = 1;
+	}
 }
 
 static struct tracer wakeup_tracer __read_mostly =
@@ -431,9 +378,10 @@ static struct tracer wakeup_tracer __read_mostly =
 	.name		= "wakeup",
 	.init		= wakeup_tracer_init,
 	.reset		= wakeup_tracer_reset,
+	.start		= wakeup_tracer_start,
+	.stop		= wakeup_tracer_stop,
 	.open		= wakeup_tracer_open,
 	.close		= wakeup_tracer_close,
-	.ctrl_update	= wakeup_tracer_ctrl_update,
 	.print_max	= 1,
 #ifdef CONFIG_FTRACE_SELFTEST
 	.selftest    = trace_selftest_startup_wakeup,
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 0911b7e073bf..88c8eb70f54a 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -9,65 +9,30 @@ static inline int trace_valid_entry(struct trace_entry *entry)
 	case TRACE_FN:
 	case TRACE_CTX:
 	case TRACE_WAKE:
+	case TRACE_CONT:
 	case TRACE_STACK:
+	case TRACE_PRINT:
 	case TRACE_SPECIAL:
+	case TRACE_BRANCH:
 		return 1;
 	}
 	return 0;
 }
 
-static int
-trace_test_buffer_cpu(struct trace_array *tr, struct trace_array_cpu *data)
+static int trace_test_buffer_cpu(struct trace_array *tr, int cpu)
 {
-	struct trace_entry *entries;
-	struct page *page;
-	int idx = 0;
-	int i;
+	struct ring_buffer_event *event;
+	struct trace_entry *entry;
 
-	BUG_ON(list_empty(&data->trace_pages));
-	page = list_entry(data->trace_pages.next, struct page, lru);
-	entries = page_address(page);
+	while ((event = ring_buffer_consume(tr->buffer, cpu, NULL))) {
+		entry = ring_buffer_event_data(event);
 
-	check_pages(data);
-	if (head_page(data) != entries)
-		goto failed;
-
-	/*
-	 * The starting trace buffer always has valid elements,
-	 * if any element exists.
-	 */
-	entries = head_page(data);
-
-	for (i = 0; i < tr->entries; i++) {
-
-		if (i < data->trace_idx && !trace_valid_entry(&entries[idx])) {
+		if (!trace_valid_entry(entry)) {
 			printk(KERN_CONT ".. invalid entry %d ",
-				entries[idx].type);
+				entry->type);
 			goto failed;
 		}
-
-		idx++;
-		if (idx >= ENTRIES_PER_PAGE) {
-			page = virt_to_page(entries);
-			if (page->lru.next == &data->trace_pages) {
-				if (i != tr->entries - 1) {
-					printk(KERN_CONT ".. entries buffer mismatch");
-					goto failed;
-				}
-			} else {
-				page = list_entry(page->lru.next, struct page, lru);
-				entries = page_address(page);
-			}
-			idx = 0;
-		}
 	}
-
-	page = virt_to_page(entries);
-	if (page->lru.next != &data->trace_pages) {
-		printk(KERN_CONT ".. too many entries");
-		goto failed;
-	}
-
 	return 0;
 
  failed:
@@ -87,20 +52,18 @@ static int trace_test_buffer(struct trace_array *tr, unsigned long *count)
 	int cpu, ret = 0;
 
 	/* Don't allow flipping of max traces now */
-	raw_local_irq_save(flags);
+	local_irq_save(flags);
 	__raw_spin_lock(&ftrace_max_lock);
-	for_each_possible_cpu(cpu) {
-		if (!head_page(tr->data[cpu]))
-			continue;
 
-		cnt += tr->data[cpu]->trace_idx;
+	cnt = ring_buffer_entries(tr->buffer);
 
-		ret = trace_test_buffer_cpu(tr, tr->data[cpu]);
+	for_each_possible_cpu(cpu) {
+		ret = trace_test_buffer_cpu(tr, cpu);
 		if (ret)
 			break;
 	}
 	__raw_spin_unlock(&ftrace_max_lock);
-	raw_local_irq_restore(flags);
+	local_irq_restore(flags);
 
 	if (count)
 		*count = cnt;
@@ -108,7 +71,12 @@ static int trace_test_buffer(struct trace_array *tr, unsigned long *count)
 	return ret;
 }
 
-#ifdef CONFIG_FTRACE
+static inline void warn_failed_init_tracer(struct tracer *trace, int init_ret)
+{
+	printk(KERN_WARNING "Failed to init %s tracer, init returned %d\n",
+		trace->name, init_ret);
+}
+#ifdef CONFIG_FUNCTION_TRACER
 
 #ifdef CONFIG_DYNAMIC_FTRACE
 
@@ -120,11 +88,11 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
 					   struct trace_array *tr,
 					   int (*func)(void))
 {
-	unsigned long count;
-	int ret;
 	int save_ftrace_enabled = ftrace_enabled;
 	int save_tracer_enabled = tracer_enabled;
+	unsigned long count;
 	char *func_name;
+	int ret;
 
 	/* The ftrace test PASSED */
 	printk(KERN_CONT "PASSED\n");
@@ -137,13 +105,6 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
 	/* passed in by parameter to fool gcc from optimizing */
 	func();
 
-	/* update the records */
-	ret = ftrace_force_update();
-	if (ret) {
-		printk(KERN_CONT ".. ftraced failed .. ");
-		return ret;
-	}
-
 	/*
 	 * Some archs *cough*PowerPC*cough* add charachters to the
 	 * start of the function names. We simply put a '*' to
@@ -155,8 +116,12 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
 	ftrace_set_filter(func_name, strlen(func_name), 1);
 
 	/* enable tracing */
-	tr->ctrl = 1;
-	trace->init(tr);
+	ret = trace->init(tr);
+	if (ret) {
+		warn_failed_init_tracer(trace, ret);
+		goto out;
+	}
+
 	/* Sleep for a 1/10 of a second */
 	msleep(100);
 
@@ -178,13 +143,13 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
 	msleep(100);
 
 	/* stop the tracing. */
-	tr->ctrl = 0;
-	trace->ctrl_update(tr);
+	tracing_stop();
 	ftrace_enabled = 0;
 
 	/* check the trace buffer */
 	ret = trace_test_buffer(tr, &count);
 	trace->reset(tr);
+	tracing_start();
 
 	/* we should only have one item */
 	if (!ret && count != 1) {
@@ -192,6 +157,7 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
 		ret = -1;
 		goto out;
 	}
+
  out:
 	ftrace_enabled = save_ftrace_enabled;
 	tracer_enabled = save_tracer_enabled;
@@ -212,37 +178,34 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
 int
 trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
 {
-	unsigned long count;
-	int ret;
 	int save_ftrace_enabled = ftrace_enabled;
 	int save_tracer_enabled = tracer_enabled;
+	unsigned long count;
+	int ret;
 
 	/* make sure msleep has been recorded */
 	msleep(1);
 
-	/* force the recorded functions to be traced */
-	ret = ftrace_force_update();
-	if (ret) {
-		printk(KERN_CONT ".. ftraced failed .. ");
-		return ret;
-	}
-
 	/* start the tracing */
 	ftrace_enabled = 1;
 	tracer_enabled = 1;
 
-	tr->ctrl = 1;
-	trace->init(tr);
+	ret = trace->init(tr);
+	if (ret) {
+		warn_failed_init_tracer(trace, ret);
+		goto out;
+	}
+
 	/* Sleep for a 1/10 of a second */
 	msleep(100);
 	/* stop the tracing. */
-	tr->ctrl = 0;
-	trace->ctrl_update(tr);
+	tracing_stop();
 	ftrace_enabled = 0;
 
 	/* check the trace buffer */
 	ret = trace_test_buffer(tr, &count);
 	trace->reset(tr);
+	tracing_start();
 
 	if (!ret && !count) {
 		printk(KERN_CONT ".. no entries found ..");
@@ -263,7 +226,7 @@ trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
 
 	return ret;
 }
-#endif /* CONFIG_FTRACE */
+#endif /* CONFIG_FUNCTION_TRACER */
 
 #ifdef CONFIG_IRQSOFF_TRACER
 int
@@ -274,8 +237,12 @@ trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr)
 	int ret;
 
 	/* start the tracing */
-	tr->ctrl = 1;
-	trace->init(tr);
+	ret = trace->init(tr);
+	if (ret) {
+		warn_failed_init_tracer(trace, ret);
+		return ret;
+	}
+
 	/* reset the max latency */
 	tracing_max_latency = 0;
 	/* disable interrupts for a bit */
@@ -283,13 +250,13 @@ trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr)
 	udelay(100);
 	local_irq_enable();
 	/* stop the tracing. */
-	tr->ctrl = 0;
-	trace->ctrl_update(tr);
+	tracing_stop();
 	/* check both trace buffers */
 	ret = trace_test_buffer(tr, NULL);
 	if (!ret)
 		ret = trace_test_buffer(&max_tr, &count);
 	trace->reset(tr);
+	tracing_start();
 
 	if (!ret && !count) {
 		printk(KERN_CONT ".. no entries found ..");
@@ -310,9 +277,26 @@ trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr)
 	unsigned long count;
 	int ret;
 
+	/*
+	 * Now that the big kernel lock is no longer preemptable,
+	 * and this is called with the BKL held, it will always
+	 * fail. If preemption is already disabled, simply
+	 * pass the test. When the BKL is removed, or becomes
+	 * preemptible again, we will once again test this,
+	 * so keep it in.
+	 */
+	if (preempt_count()) {
+		printk(KERN_CONT "can not test ... force ");
+		return 0;
+	}
+
 	/* start the tracing */
-	tr->ctrl = 1;
-	trace->init(tr);
+	ret = trace->init(tr);
+	if (ret) {
+		warn_failed_init_tracer(trace, ret);
+		return ret;
+	}
+
 	/* reset the max latency */
 	tracing_max_latency = 0;
 	/* disable preemption for a bit */
@@ -320,13 +304,13 @@ trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr)
 	udelay(100);
 	preempt_enable();
 	/* stop the tracing. */
-	tr->ctrl = 0;
-	trace->ctrl_update(tr);
+	tracing_stop();
 	/* check both trace buffers */
 	ret = trace_test_buffer(tr, NULL);
 	if (!ret)
 		ret = trace_test_buffer(&max_tr, &count);
 	trace->reset(tr);
+	tracing_start();
 
 	if (!ret && !count) {
 		printk(KERN_CONT ".. no entries found ..");
@@ -347,9 +331,25 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
 	unsigned long count;
 	int ret;
 
+	/*
+	 * Now that the big kernel lock is no longer preemptable,
+	 * and this is called with the BKL held, it will always
+	 * fail. If preemption is already disabled, simply
+	 * pass the test. When the BKL is removed, or becomes
+	 * preemptible again, we will once again test this,
+	 * so keep it in.
+	 */
+	if (preempt_count()) {
+		printk(KERN_CONT "can not test ... force ");
+		return 0;
+	}
+
 	/* start the tracing */
-	tr->ctrl = 1;
-	trace->init(tr);
+	ret = trace->init(tr);
+	if (ret) {
+		warn_failed_init_tracer(trace, ret);
+		goto out;
+	}
 
 	/* reset the max latency */
 	tracing_max_latency = 0;
@@ -363,27 +363,30 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
 	local_irq_enable();
 
 	/* stop the tracing. */
-	tr->ctrl = 0;
-	trace->ctrl_update(tr);
+	tracing_stop();
 	/* check both trace buffers */
 	ret = trace_test_buffer(tr, NULL);
-	if (ret)
+	if (ret) {
+		tracing_start();
 		goto out;
+	}
 
 	ret = trace_test_buffer(&max_tr, &count);
-	if (ret)
+	if (ret) {
+		tracing_start();
 		goto out;
+	}
 
 	if (!ret && !count) {
 		printk(KERN_CONT ".. no entries found ..");
 		ret = -1;
+		tracing_start();
 		goto out;
 	}
 
 	/* do the test by disabling interrupts first this time */
 	tracing_max_latency = 0;
-	tr->ctrl = 1;
-	trace->ctrl_update(tr);
+	tracing_start();
 	preempt_disable();
 	local_irq_disable();
 	udelay(100);
@@ -392,8 +395,7 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
 	local_irq_enable();
 
 	/* stop the tracing. */
-	tr->ctrl = 0;
-	trace->ctrl_update(tr);
+	tracing_stop();
 	/* check both trace buffers */
 	ret = trace_test_buffer(tr, NULL);
 	if (ret)
@@ -409,12 +411,22 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
 
  out:
 	trace->reset(tr);
+	tracing_start();
 	tracing_max_latency = save_max;
 
 	return ret;
 }
 #endif /* CONFIG_IRQSOFF_TRACER && CONFIG_PREEMPT_TRACER */
 
+#ifdef CONFIG_NOP_TRACER
+int
+trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr)
+{
+	/* What could possibly go wrong? */
+	return 0;
+}
+#endif
+
 #ifdef CONFIG_SCHED_TRACER
 static int trace_wakeup_test_thread(void *data)
 {
@@ -465,8 +477,12 @@ trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
 	wait_for_completion(&isrt);
 
 	/* start the tracing */
-	tr->ctrl = 1;
-	trace->init(tr);
+	ret = trace->init(tr);
+	if (ret) {
+		warn_failed_init_tracer(trace, ret);
+		return ret;
+	}
+
 	/* reset the max latency */
 	tracing_max_latency = 0;
 
@@ -486,9 +502,11 @@ trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
 
 	wake_up_process(p);
 
+	/* give a little time to let the thread wake up */
+	msleep(100);
+
 	/* stop the tracing. */
-	tr->ctrl = 0;
-	trace->ctrl_update(tr);
+	tracing_stop();
 	/* check both trace buffers */
 	ret = trace_test_buffer(tr, NULL);
 	if (!ret)
@@ -496,6 +514,7 @@ trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
 
 
 	trace->reset(tr);
+	tracing_start();
 
 	tracing_max_latency = save_max;
 
@@ -519,16 +538,20 @@ trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr
 	int ret;
 
 	/* start the tracing */
-	tr->ctrl = 1;
-	trace->init(tr);
+	ret = trace->init(tr);
+	if (ret) {
+		warn_failed_init_tracer(trace, ret);
+		return ret;
+	}
+
 	/* Sleep for a 1/10 of a second */
 	msleep(100);
 	/* stop the tracing. */
-	tr->ctrl = 0;
-	trace->ctrl_update(tr);
+	tracing_stop();
 	/* check the trace buffer */
 	ret = trace_test_buffer(tr, &count);
 	trace->reset(tr);
+	tracing_start();
 
 	if (!ret && !count) {
 		printk(KERN_CONT ".. no entries found ..");
@@ -547,17 +570,48 @@ trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr)
 	int ret;
 
 	/* start the tracing */
-	tr->ctrl = 1;
-	trace->init(tr);
+	ret = trace->init(tr);
+	if (ret) {
+		warn_failed_init_tracer(trace, ret);
+		return 0;
+	}
+
 	/* Sleep for a 1/10 of a second */
 	msleep(100);
 	/* stop the tracing. */
-	tr->ctrl = 0;
-	trace->ctrl_update(tr);
+	tracing_stop();
 	/* check the trace buffer */
 	ret = trace_test_buffer(tr, &count);
 	trace->reset(tr);
+	tracing_start();
 
 	return ret;
 }
 #endif /* CONFIG_SYSPROF_TRACER */
+
+#ifdef CONFIG_BRANCH_TRACER
+int
+trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
+{
+	unsigned long count;
+	int ret;
+
+	/* start the tracing */
+	ret = trace->init(tr);
+	if (ret) {
+		warn_failed_init_tracer(trace, ret);
+		return ret;
+	}
+
+	/* Sleep for a 1/10 of a second */
+	msleep(100);
+	/* stop the tracing. */
+	tracing_stop();
+	/* check the trace buffer */
+	ret = trace_test_buffer(tr, &count);
+	trace->reset(tr);
+	tracing_start();
+
+	return ret;
+}
+#endif /* CONFIG_BRANCH_TRACER */
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
new file mode 100644
index 000000000000..d0871bc0aca5
--- /dev/null
+++ b/kernel/trace/trace_stack.c
@@ -0,0 +1,360 @@
+/*
+ * Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+#include <linux/stacktrace.h>
+#include <linux/kallsyms.h>
+#include <linux/seq_file.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include <linux/debugfs.h>
+#include <linux/ftrace.h>
+#include <linux/module.h>
+#include <linux/sysctl.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include "trace.h"
+
+#define STACK_TRACE_ENTRIES 500
+
+static unsigned long stack_dump_trace[STACK_TRACE_ENTRIES+1] =
+	 { [0 ... (STACK_TRACE_ENTRIES)] = ULONG_MAX };
+static unsigned stack_dump_index[STACK_TRACE_ENTRIES];
+
+static struct stack_trace max_stack_trace = {
+	.max_entries		= STACK_TRACE_ENTRIES,
+	.entries		= stack_dump_trace,
+};
+
+static unsigned long max_stack_size;
+static raw_spinlock_t max_stack_lock =
+	(raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
+
+static int stack_trace_disabled __read_mostly;
+static DEFINE_PER_CPU(int, trace_active);
+static DEFINE_MUTEX(stack_sysctl_mutex);
+
+int stack_tracer_enabled;
+static int last_stack_tracer_enabled;
+
+static inline void check_stack(void)
+{
+	unsigned long this_size, flags;
+	unsigned long *p, *top, *start;
+	int i;
+
+	this_size = ((unsigned long)&this_size) & (THREAD_SIZE-1);
+	this_size = THREAD_SIZE - this_size;
+
+	if (this_size <= max_stack_size)
+		return;
+
+	/* we do not handle interrupt stacks yet */
+	if (!object_is_on_stack(&this_size))
+		return;
+
+	local_irq_save(flags);
+	__raw_spin_lock(&max_stack_lock);
+
+	/* a race could have already updated it */
+	if (this_size <= max_stack_size)
+		goto out;
+
+	max_stack_size = this_size;
+
+	max_stack_trace.nr_entries	= 0;
+	max_stack_trace.skip		= 3;
+
+	save_stack_trace(&max_stack_trace);
+
+	/*
+	 * Now find where in the stack these are.
+	 */
+	i = 0;
+	start = &this_size;
+	top = (unsigned long *)
+		(((unsigned long)start & ~(THREAD_SIZE-1)) + THREAD_SIZE);
+
+	/*
+	 * Loop through all the entries. One of the entries may
+	 * for some reason be missed on the stack, so we may
+	 * have to account for them. If they are all there, this
+	 * loop will only happen once. This code only takes place
+	 * on a new max, so it is far from a fast path.
+	 */
+	while (i < max_stack_trace.nr_entries) {
+		int found = 0;
+
+		stack_dump_index[i] = this_size;
+		p = start;
+
+		for (; p < top && i < max_stack_trace.nr_entries; p++) {
+			if (*p == stack_dump_trace[i]) {
+				this_size = stack_dump_index[i++] =
+					(top - p) * sizeof(unsigned long);
+				found = 1;
+				/* Start the search from here */
+				start = p + 1;
+			}
+		}
+
+		if (!found)
+			i++;
+	}
+
+ out:
+	__raw_spin_unlock(&max_stack_lock);
+	local_irq_restore(flags);
+}
+
+static void
+stack_trace_call(unsigned long ip, unsigned long parent_ip)
+{
+	int cpu, resched;
+
+	if (unlikely(!ftrace_enabled || stack_trace_disabled))
+		return;
+
+	resched = ftrace_preempt_disable();
+
+	cpu = raw_smp_processor_id();
+	/* no atomic needed, we only modify this variable by this cpu */
+	if (per_cpu(trace_active, cpu)++ != 0)
+		goto out;
+
+	check_stack();
+
+ out:
+	per_cpu(trace_active, cpu)--;
+	/* prevent recursion in schedule */
+	ftrace_preempt_enable(resched);
+}
+
+static struct ftrace_ops trace_ops __read_mostly =
+{
+	.func = stack_trace_call,
+};
+
+static ssize_t
+stack_max_size_read(struct file *filp, char __user *ubuf,
+		    size_t count, loff_t *ppos)
+{
+	unsigned long *ptr = filp->private_data;
+	char buf[64];
+	int r;
+
+	r = snprintf(buf, sizeof(buf), "%ld\n", *ptr);
+	if (r > sizeof(buf))
+		r = sizeof(buf);
+	return simple_read_from_buffer(ubuf, count, ppos, buf, r);
+}
+
+static ssize_t
+stack_max_size_write(struct file *filp, const char __user *ubuf,
+		     size_t count, loff_t *ppos)
+{
+	long *ptr = filp->private_data;
+	unsigned long val, flags;
+	char buf[64];
+	int ret;
+
+	if (count >= sizeof(buf))
+		return -EINVAL;
+
+	if (copy_from_user(&buf, ubuf, count))
+		return -EFAULT;
+
+	buf[count] = 0;
+
+	ret = strict_strtoul(buf, 10, &val);
+	if (ret < 0)
+		return ret;
+
+	local_irq_save(flags);
+	__raw_spin_lock(&max_stack_lock);
+	*ptr = val;
+	__raw_spin_unlock(&max_stack_lock);
+	local_irq_restore(flags);
+
+	return count;
+}
+
+static const struct file_operations stack_max_size_fops = {
+	.open		= tracing_open_generic,
+	.read		= stack_max_size_read,
+	.write		= stack_max_size_write,
+};
+
+static void *
+t_next(struct seq_file *m, void *v, loff_t *pos)
+{
+	long i;
+
+	(*pos)++;
+
+	if (v == SEQ_START_TOKEN)
+		i = 0;
+	else {
+		i = *(long *)v;
+		i++;
+	}
+
+	if (i >= max_stack_trace.nr_entries ||
+	    stack_dump_trace[i] == ULONG_MAX)
+		return NULL;
+
+	m->private = (void *)i;
+
+	return &m->private;
+}
+
+static void *t_start(struct seq_file *m, loff_t *pos)
+{
+	void *t = SEQ_START_TOKEN;
+	loff_t l = 0;
+
+	local_irq_disable();
+	__raw_spin_lock(&max_stack_lock);
+
+	if (*pos == 0)
+		return SEQ_START_TOKEN;
+
+	for (; t && l < *pos; t = t_next(m, t, &l))
+		;
+
+	return t;
+}
+
+static void t_stop(struct seq_file *m, void *p)
+{
+	__raw_spin_unlock(&max_stack_lock);
+	local_irq_enable();
+}
+
+static int trace_lookup_stack(struct seq_file *m, long i)
+{
+	unsigned long addr = stack_dump_trace[i];
+#ifdef CONFIG_KALLSYMS
+	char str[KSYM_SYMBOL_LEN];
+
+	sprint_symbol(str, addr);
+
+	return seq_printf(m, "%s\n", str);
+#else
+	return seq_printf(m, "%p\n", (void*)addr);
+#endif
+}
+
+static int t_show(struct seq_file *m, void *v)
+{
+	long i;
+	int size;
+
+	if (v == SEQ_START_TOKEN) {
+		seq_printf(m, "        Depth   Size      Location"
+			   "    (%d entries)\n"
+			   "        -----   ----      --------\n",
+			   max_stack_trace.nr_entries);
+		return 0;
+	}
+
+	i = *(long *)v;
+
+	if (i >= max_stack_trace.nr_entries ||
+	    stack_dump_trace[i] == ULONG_MAX)
+		return 0;
+
+	if (i+1 == max_stack_trace.nr_entries ||
+	    stack_dump_trace[i+1] == ULONG_MAX)
+		size = stack_dump_index[i];
+	else
+		size = stack_dump_index[i] - stack_dump_index[i+1];
+
+	seq_printf(m, "%3ld) %8d   %5d   ", i, stack_dump_index[i], size);
+
+	trace_lookup_stack(m, i);
+
+	return 0;
+}
+
+static const struct seq_operations stack_trace_seq_ops = {
+	.start		= t_start,
+	.next		= t_next,
+	.stop		= t_stop,
+	.show		= t_show,
+};
+
+static int stack_trace_open(struct inode *inode, struct file *file)
+{
+	int ret;
+
+	ret = seq_open(file, &stack_trace_seq_ops);
+
+	return ret;
+}
+
+static const struct file_operations stack_trace_fops = {
+	.open		= stack_trace_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+};
+
+int
+stack_trace_sysctl(struct ctl_table *table, int write,
+		   struct file *file, void __user *buffer, size_t *lenp,
+		   loff_t *ppos)
+{
+	int ret;
+
+	mutex_lock(&stack_sysctl_mutex);
+
+	ret = proc_dointvec(table, write, file, buffer, lenp, ppos);
+
+	if (ret || !write ||
+	    (last_stack_tracer_enabled == stack_tracer_enabled))
+		goto out;
+
+	last_stack_tracer_enabled = stack_tracer_enabled;
+
+	if (stack_tracer_enabled)
+		register_ftrace_function(&trace_ops);
+	else
+		unregister_ftrace_function(&trace_ops);
+
+ out:
+	mutex_unlock(&stack_sysctl_mutex);
+	return ret;
+}
+
+static __init int enable_stacktrace(char *str)
+{
+	stack_tracer_enabled = 1;
+	last_stack_tracer_enabled = 1;
+	return 1;
+}
+__setup("stacktrace", enable_stacktrace);
+
+static __init int stack_trace_init(void)
+{
+	struct dentry *d_tracer;
+	struct dentry *entry;
+
+	d_tracer = tracing_init_dentry();
+
+	entry = debugfs_create_file("stack_max_size", 0644, d_tracer,
+				    &max_stack_size, &stack_max_size_fops);
+	if (!entry)
+		pr_warning("Could not create debugfs 'stack_max_size' entry\n");
+
+	entry = debugfs_create_file("stack_trace", 0444, d_tracer,
+				    NULL, &stack_trace_fops);
+	if (!entry)
+		pr_warning("Could not create debugfs 'stack_trace' entry\n");
+
+	if (stack_tracer_enabled)
+		register_ftrace_function(&trace_ops);
+
+	return 0;
+}
+
+device_initcall(stack_trace_init);
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
index db58fb66a135..a5779bd975db 100644
--- a/kernel/trace/trace_sysprof.c
+++ b/kernel/trace/trace_sysprof.c
@@ -202,7 +202,6 @@ static void start_stack_timer(int cpu)
 
 	hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	hrtimer->function = stack_trace_timer_fn;
-	hrtimer->cb_mode = HRTIMER_CB_IRQSAFE_PERCPU;
 
 	hrtimer_start(hrtimer, ns_to_ktime(sample_period), HRTIMER_MODE_REL);
 }
@@ -234,20 +233,10 @@ static void stop_stack_timers(void)
 		stop_stack_timer(cpu);
 }
 
-static void stack_reset(struct trace_array *tr)
-{
-	int cpu;
-
-	tr->time_start = ftrace_now(tr->cpu);
-
-	for_each_online_cpu(cpu)
-		tracing_reset(tr->data[cpu]);
-}
-
 static void start_stack_trace(struct trace_array *tr)
 {
 	mutex_lock(&sample_timer_lock);
-	stack_reset(tr);
+	tracing_reset_online_cpus(tr);
 	start_stack_timers();
 	tracer_enabled = 1;
 	mutex_unlock(&sample_timer_lock);
@@ -261,27 +250,17 @@ static void stop_stack_trace(struct trace_array *tr)
 	mutex_unlock(&sample_timer_lock);
 }
 
-static void stack_trace_init(struct trace_array *tr)
+static int stack_trace_init(struct trace_array *tr)
 {
 	sysprof_trace = tr;
 
-	if (tr->ctrl)
-		start_stack_trace(tr);
+	start_stack_trace(tr);
+	return 0;
 }
 
 static void stack_trace_reset(struct trace_array *tr)
 {
-	if (tr->ctrl)
-		stop_stack_trace(tr);
-}
-
-static void stack_trace_ctrl_update(struct trace_array *tr)
-{
-	/* When starting a new trace, reset the buffers */
-	if (tr->ctrl)
-		start_stack_trace(tr);
-	else
-		stop_stack_trace(tr);
+	stop_stack_trace(tr);
 }
 
 static struct tracer stack_trace __read_mostly =
@@ -289,7 +268,6 @@ static struct tracer stack_trace __read_mostly =
 	.name		= "sysprof",
 	.init		= stack_trace_init,
 	.reset		= stack_trace_reset,
-	.ctrl_update	= stack_trace_ctrl_update,
 #ifdef CONFIG_FTRACE_SELFTEST
 	.selftest    = trace_selftest_startup_sysprof,
 #endif
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
new file mode 100644
index 000000000000..79602740bbb5
--- /dev/null
+++ b/kernel/tracepoint.c
@@ -0,0 +1,576 @@
+/*
+ * Copyright (C) 2008 Mathieu Desnoyers
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/types.h>
+#include <linux/jhash.h>
+#include <linux/list.h>
+#include <linux/rcupdate.h>
+#include <linux/tracepoint.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+
+extern struct tracepoint __start___tracepoints[];
+extern struct tracepoint __stop___tracepoints[];
+
+/* Set to 1 to enable tracepoint debug output */
+static const int tracepoint_debug;
+
+/*
+ * tracepoints_mutex nests inside module_mutex. Tracepoints mutex protects the
+ * builtin and module tracepoints and the hash table.
+ */
+static DEFINE_MUTEX(tracepoints_mutex);
+
+/*
+ * Tracepoint hash table, containing the active tracepoints.
+ * Protected by tracepoints_mutex.
+ */
+#define TRACEPOINT_HASH_BITS 6
+#define TRACEPOINT_TABLE_SIZE (1 << TRACEPOINT_HASH_BITS)
+static struct hlist_head tracepoint_table[TRACEPOINT_TABLE_SIZE];
+
+/*
+ * Note about RCU :
+ * It is used to to delay the free of multiple probes array until a quiescent
+ * state is reached.
+ * Tracepoint entries modifications are protected by the tracepoints_mutex.
+ */
+struct tracepoint_entry {
+	struct hlist_node hlist;
+	void **funcs;
+	int refcount;	/* Number of times armed. 0 if disarmed. */
+	char name[0];
+};
+
+struct tp_probes {
+	union {
+		struct rcu_head rcu;
+		struct list_head list;
+	} u;
+	void *probes[0];
+};
+
+static inline void *allocate_probes(int count)
+{
+	struct tp_probes *p  = kmalloc(count * sizeof(void *)
+			+ sizeof(struct tp_probes), GFP_KERNEL);
+	return p == NULL ? NULL : p->probes;
+}
+
+static void rcu_free_old_probes(struct rcu_head *head)
+{
+	kfree(container_of(head, struct tp_probes, u.rcu));
+}
+
+static inline void release_probes(void *old)
+{
+	if (old) {
+		struct tp_probes *tp_probes = container_of(old,
+			struct tp_probes, probes[0]);
+		call_rcu_sched(&tp_probes->u.rcu, rcu_free_old_probes);
+	}
+}
+
+static void debug_print_probes(struct tracepoint_entry *entry)
+{
+	int i;
+
+	if (!tracepoint_debug || !entry->funcs)
+		return;
+
+	for (i = 0; entry->funcs[i]; i++)
+		printk(KERN_DEBUG "Probe %d : %p\n", i, entry->funcs[i]);
+}
+
+static void *
+tracepoint_entry_add_probe(struct tracepoint_entry *entry, void *probe)
+{
+	int nr_probes = 0;
+	void **old, **new;
+
+	WARN_ON(!probe);
+
+	debug_print_probes(entry);
+	old = entry->funcs;
+	if (old) {
+		/* (N -> N+1), (N != 0, 1) probes */
+		for (nr_probes = 0; old[nr_probes]; nr_probes++)
+			if (old[nr_probes] == probe)
+				return ERR_PTR(-EEXIST);
+	}
+	/* + 2 : one for new probe, one for NULL func */
+	new = allocate_probes(nr_probes + 2);
+	if (new == NULL)
+		return ERR_PTR(-ENOMEM);
+	if (old)
+		memcpy(new, old, nr_probes * sizeof(void *));
+	new[nr_probes] = probe;
+	new[nr_probes + 1] = NULL;
+	entry->refcount = nr_probes + 1;
+	entry->funcs = new;
+	debug_print_probes(entry);
+	return old;
+}
+
+static void *
+tracepoint_entry_remove_probe(struct tracepoint_entry *entry, void *probe)
+{
+	int nr_probes = 0, nr_del = 0, i;
+	void **old, **new;
+
+	old = entry->funcs;
+
+	if (!old)
+		return ERR_PTR(-ENOENT);
+
+	debug_print_probes(entry);
+	/* (N -> M), (N > 1, M >= 0) probes */
+	for (nr_probes = 0; old[nr_probes]; nr_probes++) {
+		if ((!probe || old[nr_probes] == probe))
+			nr_del++;
+	}
+
+	if (nr_probes - nr_del == 0) {
+		/* N -> 0, (N > 1) */
+		entry->funcs = NULL;
+		entry->refcount = 0;
+		debug_print_probes(entry);
+		return old;
+	} else {
+		int j = 0;
+		/* N -> M, (N > 1, M > 0) */
+		/* + 1 for NULL */
+		new = allocate_probes(nr_probes - nr_del + 1);
+		if (new == NULL)
+			return ERR_PTR(-ENOMEM);
+		for (i = 0; old[i]; i++)
+			if ((probe && old[i] != probe))
+				new[j++] = old[i];
+		new[nr_probes - nr_del] = NULL;
+		entry->refcount = nr_probes - nr_del;
+		entry->funcs = new;
+	}
+	debug_print_probes(entry);
+	return old;
+}
+
+/*
+ * Get tracepoint if the tracepoint is present in the tracepoint hash table.
+ * Must be called with tracepoints_mutex held.
+ * Returns NULL if not present.
+ */
+static struct tracepoint_entry *get_tracepoint(const char *name)
+{
+	struct hlist_head *head;
+	struct hlist_node *node;
+	struct tracepoint_entry *e;
+	u32 hash = jhash(name, strlen(name), 0);
+
+	head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)];
+	hlist_for_each_entry(e, node, head, hlist) {
+		if (!strcmp(name, e->name))
+			return e;
+	}
+	return NULL;
+}
+
+/*
+ * Add the tracepoint to the tracepoint hash table. Must be called with
+ * tracepoints_mutex held.
+ */
+static struct tracepoint_entry *add_tracepoint(const char *name)
+{
+	struct hlist_head *head;
+	struct hlist_node *node;
+	struct tracepoint_entry *e;
+	size_t name_len = strlen(name) + 1;
+	u32 hash = jhash(name, name_len-1, 0);
+
+	head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)];
+	hlist_for_each_entry(e, node, head, hlist) {
+		if (!strcmp(name, e->name)) {
+			printk(KERN_NOTICE
+				"tracepoint %s busy\n", name);
+			return ERR_PTR(-EEXIST);	/* Already there */
+		}
+	}
+	/*
+	 * Using kmalloc here to allocate a variable length element. Could
+	 * cause some memory fragmentation if overused.
+	 */
+	e = kmalloc(sizeof(struct tracepoint_entry) + name_len, GFP_KERNEL);
+	if (!e)
+		return ERR_PTR(-ENOMEM);
+	memcpy(&e->name[0], name, name_len);
+	e->funcs = NULL;
+	e->refcount = 0;
+	hlist_add_head(&e->hlist, head);
+	return e;
+}
+
+/*
+ * Remove the tracepoint from the tracepoint hash table. Must be called with
+ * mutex_lock held.
+ */
+static inline void remove_tracepoint(struct tracepoint_entry *e)
+{
+	hlist_del(&e->hlist);
+	kfree(e);
+}
+
+/*
+ * Sets the probe callback corresponding to one tracepoint.
+ */
+static void set_tracepoint(struct tracepoint_entry **entry,
+	struct tracepoint *elem, int active)
+{
+	WARN_ON(strcmp((*entry)->name, elem->name) != 0);
+
+	/*
+	 * rcu_assign_pointer has a smp_wmb() which makes sure that the new
+	 * probe callbacks array is consistent before setting a pointer to it.
+	 * This array is referenced by __DO_TRACE from
+	 * include/linux/tracepoints.h. A matching smp_read_barrier_depends()
+	 * is used.
+	 */
+	rcu_assign_pointer(elem->funcs, (*entry)->funcs);
+	elem->state = active;
+}
+
+/*
+ * Disable a tracepoint and its probe callback.
+ * Note: only waiting an RCU period after setting elem->call to the empty
+ * function insures that the original callback is not used anymore. This insured
+ * by preempt_disable around the call site.
+ */
+static void disable_tracepoint(struct tracepoint *elem)
+{
+	elem->state = 0;
+	rcu_assign_pointer(elem->funcs, NULL);
+}
+
+/**
+ * tracepoint_update_probe_range - Update a probe range
+ * @begin: beginning of the range
+ * @end: end of the range
+ *
+ * Updates the probe callback corresponding to a range of tracepoints.
+ */
+void tracepoint_update_probe_range(struct tracepoint *begin,
+	struct tracepoint *end)
+{
+	struct tracepoint *iter;
+	struct tracepoint_entry *mark_entry;
+
+	mutex_lock(&tracepoints_mutex);
+	for (iter = begin; iter < end; iter++) {
+		mark_entry = get_tracepoint(iter->name);
+		if (mark_entry) {
+			set_tracepoint(&mark_entry, iter,
+					!!mark_entry->refcount);
+		} else {
+			disable_tracepoint(iter);
+		}
+	}
+	mutex_unlock(&tracepoints_mutex);
+}
+
+/*
+ * Update probes, removing the faulty probes.
+ */
+static void tracepoint_update_probes(void)
+{
+	/* Core kernel tracepoints */
+	tracepoint_update_probe_range(__start___tracepoints,
+		__stop___tracepoints);
+	/* tracepoints in modules. */
+	module_update_tracepoints();
+}
+
+static void *tracepoint_add_probe(const char *name, void *probe)
+{
+	struct tracepoint_entry *entry;
+	void *old;
+
+	entry = get_tracepoint(name);
+	if (!entry) {
+		entry = add_tracepoint(name);
+		if (IS_ERR(entry))
+			return entry;
+	}
+	old = tracepoint_entry_add_probe(entry, probe);
+	if (IS_ERR(old) && !entry->refcount)
+		remove_tracepoint(entry);
+	return old;
+}
+
+/**
+ * tracepoint_probe_register -  Connect a probe to a tracepoint
+ * @name: tracepoint name
+ * @probe: probe handler
+ *
+ * Returns 0 if ok, error value on error.
+ * The probe address must at least be aligned on the architecture pointer size.
+ */
+int tracepoint_probe_register(const char *name, void *probe)
+{
+	void *old;
+
+	mutex_lock(&tracepoints_mutex);
+	old = tracepoint_add_probe(name, probe);
+	mutex_unlock(&tracepoints_mutex);
+	if (IS_ERR(old))
+		return PTR_ERR(old);
+
+	tracepoint_update_probes();		/* may update entry */
+	release_probes(old);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tracepoint_probe_register);
+
+static void *tracepoint_remove_probe(const char *name, void *probe)
+{
+	struct tracepoint_entry *entry;
+	void *old;
+
+	entry = get_tracepoint(name);
+	if (!entry)
+		return ERR_PTR(-ENOENT);
+	old = tracepoint_entry_remove_probe(entry, probe);
+	if (IS_ERR(old))
+		return old;
+	if (!entry->refcount)
+		remove_tracepoint(entry);
+	return old;
+}
+
+/**
+ * tracepoint_probe_unregister -  Disconnect a probe from a tracepoint
+ * @name: tracepoint name
+ * @probe: probe function pointer
+ *
+ * We do not need to call a synchronize_sched to make sure the probes have
+ * finished running before doing a module unload, because the module unload
+ * itself uses stop_machine(), which insures that every preempt disabled section
+ * have finished.
+ */
+int tracepoint_probe_unregister(const char *name, void *probe)
+{
+	void *old;
+
+	mutex_lock(&tracepoints_mutex);
+	old = tracepoint_remove_probe(name, probe);
+	mutex_unlock(&tracepoints_mutex);
+	if (IS_ERR(old))
+		return PTR_ERR(old);
+
+	tracepoint_update_probes();		/* may update entry */
+	release_probes(old);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tracepoint_probe_unregister);
+
+static LIST_HEAD(old_probes);
+static int need_update;
+
+static void tracepoint_add_old_probes(void *old)
+{
+	need_update = 1;
+	if (old) {
+		struct tp_probes *tp_probes = container_of(old,
+			struct tp_probes, probes[0]);
+		list_add(&tp_probes->u.list, &old_probes);
+	}
+}
+
+/**
+ * tracepoint_probe_register_noupdate -  register a probe but not connect
+ * @name: tracepoint name
+ * @probe: probe handler
+ *
+ * caller must call tracepoint_probe_update_all()
+ */
+int tracepoint_probe_register_noupdate(const char *name, void *probe)
+{
+	void *old;
+
+	mutex_lock(&tracepoints_mutex);
+	old = tracepoint_add_probe(name, probe);
+	if (IS_ERR(old)) {
+		mutex_unlock(&tracepoints_mutex);
+		return PTR_ERR(old);
+	}
+	tracepoint_add_old_probes(old);
+	mutex_unlock(&tracepoints_mutex);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tracepoint_probe_register_noupdate);
+
+/**
+ * tracepoint_probe_unregister_noupdate -  remove a probe but not disconnect
+ * @name: tracepoint name
+ * @probe: probe function pointer
+ *
+ * caller must call tracepoint_probe_update_all()
+ */
+int tracepoint_probe_unregister_noupdate(const char *name, void *probe)
+{
+	void *old;
+
+	mutex_lock(&tracepoints_mutex);
+	old = tracepoint_remove_probe(name, probe);
+	if (IS_ERR(old)) {
+		mutex_unlock(&tracepoints_mutex);
+		return PTR_ERR(old);
+	}
+	tracepoint_add_old_probes(old);
+	mutex_unlock(&tracepoints_mutex);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tracepoint_probe_unregister_noupdate);
+
+/**
+ * tracepoint_probe_update_all -  update tracepoints
+ */
+void tracepoint_probe_update_all(void)
+{
+	LIST_HEAD(release_probes);
+	struct tp_probes *pos, *next;
+
+	mutex_lock(&tracepoints_mutex);
+	if (!need_update) {
+		mutex_unlock(&tracepoints_mutex);
+		return;
+	}
+	if (!list_empty(&old_probes))
+		list_replace_init(&old_probes, &release_probes);
+	need_update = 0;
+	mutex_unlock(&tracepoints_mutex);
+
+	tracepoint_update_probes();
+	list_for_each_entry_safe(pos, next, &release_probes, u.list) {
+		list_del(&pos->u.list);
+		call_rcu_sched(&pos->u.rcu, rcu_free_old_probes);
+	}
+}
+EXPORT_SYMBOL_GPL(tracepoint_probe_update_all);
+
+/**
+ * tracepoint_get_iter_range - Get a next tracepoint iterator given a range.
+ * @tracepoint: current tracepoints (in), next tracepoint (out)
+ * @begin: beginning of the range
+ * @end: end of the range
+ *
+ * Returns whether a next tracepoint has been found (1) or not (0).
+ * Will return the first tracepoint in the range if the input tracepoint is
+ * NULL.
+ */
+int tracepoint_get_iter_range(struct tracepoint **tracepoint,
+	struct tracepoint *begin, struct tracepoint *end)
+{
+	if (!*tracepoint && begin != end) {
+		*tracepoint = begin;
+		return 1;
+	}
+	if (*tracepoint >= begin && *tracepoint < end)
+		return 1;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tracepoint_get_iter_range);
+
+static void tracepoint_get_iter(struct tracepoint_iter *iter)
+{
+	int found = 0;
+
+	/* Core kernel tracepoints */
+	if (!iter->module) {
+		found = tracepoint_get_iter_range(&iter->tracepoint,
+				__start___tracepoints, __stop___tracepoints);
+		if (found)
+			goto end;
+	}
+	/* tracepoints in modules. */
+	found = module_get_iter_tracepoints(iter);
+end:
+	if (!found)
+		tracepoint_iter_reset(iter);
+}
+
+void tracepoint_iter_start(struct tracepoint_iter *iter)
+{
+	tracepoint_get_iter(iter);
+}
+EXPORT_SYMBOL_GPL(tracepoint_iter_start);
+
+void tracepoint_iter_next(struct tracepoint_iter *iter)
+{
+	iter->tracepoint++;
+	/*
+	 * iter->tracepoint may be invalid because we blindly incremented it.
+	 * Make sure it is valid by marshalling on the tracepoints, getting the
+	 * tracepoints from following modules if necessary.
+	 */
+	tracepoint_get_iter(iter);
+}
+EXPORT_SYMBOL_GPL(tracepoint_iter_next);
+
+void tracepoint_iter_stop(struct tracepoint_iter *iter)
+{
+}
+EXPORT_SYMBOL_GPL(tracepoint_iter_stop);
+
+void tracepoint_iter_reset(struct tracepoint_iter *iter)
+{
+	iter->module = NULL;
+	iter->tracepoint = NULL;
+}
+EXPORT_SYMBOL_GPL(tracepoint_iter_reset);
+
+#ifdef CONFIG_MODULES
+
+int tracepoint_module_notify(struct notifier_block *self,
+			     unsigned long val, void *data)
+{
+	struct module *mod = data;
+
+	switch (val) {
+	case MODULE_STATE_COMING:
+		tracepoint_update_probe_range(mod->tracepoints,
+			mod->tracepoints + mod->num_tracepoints);
+		break;
+	case MODULE_STATE_GOING:
+		tracepoint_update_probe_range(mod->tracepoints,
+			mod->tracepoints + mod->num_tracepoints);
+		break;
+	}
+	return 0;
+}
+
+struct notifier_block tracepoint_module_nb = {
+	.notifier_call = tracepoint_module_notify,
+	.priority = 0,
+};
+
+static int init_tracepoints(void)
+{
+	return register_module_notifier(&tracepoint_module_nb);
+}
+__initcall(init_tracepoints);
+
+#endif /* CONFIG_MODULES */
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 8ebcd8532dfb..2dc06ab35716 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -27,6 +27,7 @@
  */
 void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
 {
+	const struct cred *tcred;
 	struct timespec uptime, ts;
 	u64 ac_etime;
 
@@ -53,10 +54,11 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
 		stats->ac_flag |= AXSIG;
 	stats->ac_nice	 = task_nice(tsk);
 	stats->ac_sched	 = tsk->policy;
-	stats->ac_uid	 = tsk->uid;
-	stats->ac_gid	 = tsk->gid;
 	stats->ac_pid	 = tsk->pid;
 	rcu_read_lock();
+	tcred = __task_cred(tsk);
+	stats->ac_uid	 = tcred->uid;
+	stats->ac_gid	 = tcred->gid;
 	stats->ac_ppid	 = pid_alive(tsk) ?
 				rcu_dereference(tsk->real_parent)->tgid : 0;
 	rcu_read_unlock();
diff --git a/kernel/uid16.c b/kernel/uid16.c
index 3e41c1673e2f..2460c3199b5a 100644
--- a/kernel/uid16.c
+++ b/kernel/uid16.c
@@ -84,11 +84,12 @@ asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
 
 asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid)
 {
+	const struct cred *cred = current_cred();
 	int retval;
 
-	if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
-	    !(retval = put_user(high2lowuid(current->euid), euid)))
-		retval = put_user(high2lowuid(current->suid), suid);
+	if (!(retval   = put_user(high2lowuid(cred->uid),  ruid)) &&
+	    !(retval   = put_user(high2lowuid(cred->euid), euid)))
+		retval = put_user(high2lowuid(cred->suid), suid);
 
 	return retval;
 }
@@ -104,11 +105,12 @@ asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
 
 asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid)
 {
+	const struct cred *cred = current_cred();
 	int retval;
 
-	if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
-	    !(retval = put_user(high2lowgid(current->egid), egid)))
-		retval = put_user(high2lowgid(current->sgid), sgid);
+	if (!(retval   = put_user(high2lowgid(cred->gid),  rgid)) &&
+	    !(retval   = put_user(high2lowgid(cred->egid), egid)))
+		retval = put_user(high2lowgid(cred->sgid), sgid);
 
 	return retval;
 }
@@ -161,25 +163,24 @@ static int groups16_from_user(struct group_info *group_info,
 
 asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist)
 {
-	int i = 0;
+	const struct cred *cred = current_cred();
+	int i;
 
 	if (gidsetsize < 0)
 		return -EINVAL;
 
-	get_group_info(current->group_info);
-	i = current->group_info->ngroups;
+	i = cred->group_info->ngroups;
 	if (gidsetsize) {
 		if (i > gidsetsize) {
 			i = -EINVAL;
 			goto out;
 		}
-		if (groups16_to_user(grouplist, current->group_info)) {
+		if (groups16_to_user(grouplist, cred->group_info)) {
 			i = -EFAULT;
 			goto out;
 		}
 	}
 out:
-	put_group_info(current->group_info);
 	return i;
 }
 
@@ -210,20 +211,20 @@ asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist)
 
 asmlinkage long sys_getuid16(void)
 {
-	return high2lowuid(current->uid);
+	return high2lowuid(current_uid());
 }
 
 asmlinkage long sys_geteuid16(void)
 {
-	return high2lowuid(current->euid);
+	return high2lowuid(current_euid());
 }
 
 asmlinkage long sys_getgid16(void)
 {
-	return high2lowgid(current->gid);
+	return high2lowgid(current_gid());
 }
 
 asmlinkage long sys_getegid16(void)
 {
-	return high2lowgid(current->egid);
+	return high2lowgid(current_egid());
 }
diff --git a/kernel/user.c b/kernel/user.c
index 39d6159fae43..477b6660f447 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -16,12 +16,13 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/user_namespace.h>
+#include "cred-internals.h"
 
 struct user_namespace init_user_ns = {
 	.kref = {
-		.refcount	= ATOMIC_INIT(2),
+		.refcount	= ATOMIC_INIT(1),
 	},
-	.root_user = &root_user,
+	.creator = &root_user,
 };
 EXPORT_SYMBOL_GPL(init_user_ns);
 
@@ -47,12 +48,14 @@ static struct kmem_cache *uid_cachep;
  */
 static DEFINE_SPINLOCK(uidhash_lock);
 
+/* root_user.__count is 2, 1 for init task cred, 1 for init_user_ns->creator */
 struct user_struct root_user = {
-	.__count	= ATOMIC_INIT(1),
+	.__count	= ATOMIC_INIT(2),
 	.processes	= ATOMIC_INIT(1),
 	.files		= ATOMIC_INIT(0),
 	.sigpending	= ATOMIC_INIT(0),
 	.locked_shm     = 0,
+	.user_ns	= &init_user_ns,
 #ifdef CONFIG_USER_SCHED
 	.tg		= &init_task_group,
 #endif
@@ -101,19 +104,15 @@ static int sched_create_user(struct user_struct *up)
 	if (IS_ERR(up->tg))
 		rc = -ENOMEM;
 
-	return rc;
-}
+	set_tg_uid(up);
 
-static void sched_switch_user(struct task_struct *p)
-{
-	sched_move_task(p);
+	return rc;
 }
 
 #else	/* CONFIG_USER_SCHED */
 
 static void sched_destroy_user(struct user_struct *up) { }
 static int sched_create_user(struct user_struct *up) { return 0; }
-static void sched_switch_user(struct task_struct *p) { }
 
 #endif	/* CONFIG_USER_SCHED */
 
@@ -242,13 +241,21 @@ static struct kobj_type uids_ktype = {
 	.release = uids_release,
 };
 
-/* create /sys/kernel/uids/<uid>/cpu_share file for this user */
+/*
+ * Create /sys/kernel/uids/<uid>/cpu_share file for this user
+ * We do not create this file for users in a user namespace (until
+ * sysfs tagging is implemented).
+ *
+ * See Documentation/scheduler/sched-design-CFS.txt for ramifications.
+ */
 static int uids_user_create(struct user_struct *up)
 {
 	struct kobject *kobj = &up->kobj;
 	int error;
 
 	memset(kobj, 0, sizeof(struct kobject));
+	if (up->user_ns != &init_user_ns)
+		return 0;
 	kobj->kset = uids_kset;
 	error = kobject_init_and_add(kobj, &uids_ktype, NULL, "%d", up->uid);
 	if (error) {
@@ -284,6 +291,8 @@ static void remove_user_sysfs_dir(struct work_struct *w)
 	unsigned long flags;
 	int remove_user = 0;
 
+	if (up->user_ns != &init_user_ns)
+		return;
 	/* Make uid_hash_remove() + sysfs_remove_file() + kobject_del()
 	 * atomic.
 	 */
@@ -319,12 +328,13 @@ done:
  * IRQ state (as stored in flags) is restored and uidhash_lock released
  * upon function exit.
  */
-static inline void free_user(struct user_struct *up, unsigned long flags)
+static void free_user(struct user_struct *up, unsigned long flags)
 {
 	/* restore back the count */
 	atomic_inc(&up->__count);
 	spin_unlock_irqrestore(&uidhash_lock, flags);
 
+	put_user_ns(up->user_ns);
 	INIT_WORK(&up->work, remove_user_sysfs_dir);
 	schedule_work(&up->work);
 }
@@ -340,13 +350,14 @@ static inline void uids_mutex_unlock(void) { }
  * IRQ state (as stored in flags) is restored and uidhash_lock released
  * upon function exit.
  */
-static inline void free_user(struct user_struct *up, unsigned long flags)
+static void free_user(struct user_struct *up, unsigned long flags)
 {
 	uid_hash_remove(up);
 	spin_unlock_irqrestore(&uidhash_lock, flags);
 	sched_destroy_user(up);
 	key_put(up->uid_keyring);
 	key_put(up->session_keyring);
+	put_user_ns(up->user_ns);
 	kmem_cache_free(uid_cachep, up);
 }
 
@@ -362,7 +373,7 @@ struct user_struct *find_user(uid_t uid)
 {
 	struct user_struct *ret;
 	unsigned long flags;
-	struct user_namespace *ns = current->nsproxy->user_ns;
+	struct user_namespace *ns = current_user_ns();
 
 	spin_lock_irqsave(&uidhash_lock, flags);
 	ret = uid_hash_find(uid, uidhashentry(ns, uid));
@@ -409,6 +420,8 @@ struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid)
 		if (sched_create_user(new) < 0)
 			goto out_free_user;
 
+		new->user_ns = get_user_ns(ns);
+
 		if (uids_user_create(new))
 			goto out_destoy_sched;
 
@@ -432,7 +445,6 @@ struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid)
 			up = new;
 		}
 		spin_unlock_irq(&uidhash_lock);
-
 	}
 
 	uids_mutex_unlock();
@@ -441,6 +453,7 @@ struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid)
 
 out_destoy_sched:
 	sched_destroy_user(new);
+	put_user_ns(new->user_ns);
 out_free_user:
 	kmem_cache_free(uid_cachep, new);
 out_unlock:
@@ -448,63 +461,6 @@ out_unlock:
 	return NULL;
 }
 
-void switch_uid(struct user_struct *new_user)
-{
-	struct user_struct *old_user;
-
-	/* What if a process setreuid()'s and this brings the
-	 * new uid over his NPROC rlimit?  We can check this now
-	 * cheaply with the new uid cache, so if it matters
-	 * we should be checking for it.  -DaveM
-	 */
-	old_user = current->user;
-	atomic_inc(&new_user->processes);
-	atomic_dec(&old_user->processes);
-	switch_uid_keyring(new_user);
-	current->user = new_user;
-	sched_switch_user(current);
-
-	/*
-	 * We need to synchronize with __sigqueue_alloc()
-	 * doing a get_uid(p->user).. If that saw the old
-	 * user value, we need to wait until it has exited
-	 * its critical region before we can free the old
-	 * structure.
-	 */
-	smp_mb();
-	spin_unlock_wait(&current->sighand->siglock);
-
-	free_uid(old_user);
-	suid_keys(current);
-}
-
-#ifdef CONFIG_USER_NS
-void release_uids(struct user_namespace *ns)
-{
-	int i;
-	unsigned long flags;
-	struct hlist_head *head;
-	struct hlist_node *nd;
-
-	spin_lock_irqsave(&uidhash_lock, flags);
-	/*
-	 * collapse the chains so that the user_struct-s will
-	 * be still alive, but not in hashes. subsequent free_uid()
-	 * will free them.
-	 */
-	for (i = 0; i < UIDHASH_SZ; i++) {
-		head = ns->uidhash_table + i;
-		while (!hlist_empty(head)) {
-			nd = head->first;
-			hlist_del_init(nd);
-		}
-	}
-	spin_unlock_irqrestore(&uidhash_lock, flags);
-
-	free_uid(ns->root_user);
-}
-#endif
-
 static int __init uid_cache_init(void)
 {
 	int n;
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 532858fa5b88..79084311ee57 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -9,60 +9,55 @@
 #include <linux/nsproxy.h>
 #include <linux/slab.h>
 #include <linux/user_namespace.h>
+#include <linux/cred.h>
 
 /*
- * Clone a new ns copying an original user ns, setting refcount to 1
- * @old_ns: namespace to clone
- * Return NULL on error (failure to kmalloc), new ns otherwise
+ * Create a new user namespace, deriving the creator from the user in the
+ * passed credentials, and replacing that user with the new root user for the
+ * new namespace.
+ *
+ * This is called by copy_creds(), which will finish setting the target task's
+ * credentials.
  */
-static struct user_namespace *clone_user_ns(struct user_namespace *old_ns)
+int create_user_ns(struct cred *new)
 {
 	struct user_namespace *ns;
-	struct user_struct *new_user;
+	struct user_struct *root_user;
 	int n;
 
 	ns = kmalloc(sizeof(struct user_namespace), GFP_KERNEL);
 	if (!ns)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 
 	kref_init(&ns->kref);
 
 	for (n = 0; n < UIDHASH_SZ; ++n)
 		INIT_HLIST_HEAD(ns->uidhash_table + n);
 
-	/* Insert new root user.  */
-	ns->root_user = alloc_uid(ns, 0);
-	if (!ns->root_user) {
+	/* Alloc new root user.  */
+	root_user = alloc_uid(ns, 0);
+	if (!root_user) {
 		kfree(ns);
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 	}
 
-	/* Reset current->user with a new one */
-	new_user = alloc_uid(ns, current->uid);
-	if (!new_user) {
-		free_uid(ns->root_user);
-		kfree(ns);
-		return ERR_PTR(-ENOMEM);
-	}
-
-	switch_uid(new_user);
-	return ns;
-}
-
-struct user_namespace * copy_user_ns(int flags, struct user_namespace *old_ns)
-{
-	struct user_namespace *new_ns;
-
-	BUG_ON(!old_ns);
-	get_user_ns(old_ns);
-
-	if (!(flags & CLONE_NEWUSER))
-		return old_ns;
+	/* set the new root user in the credentials under preparation */
+	ns->creator = new->user;
+	new->user = root_user;
+	new->uid = new->euid = new->suid = new->fsuid = 0;
+	new->gid = new->egid = new->sgid = new->fsgid = 0;
+	put_group_info(new->group_info);
+	new->group_info = get_group_info(&init_groups);
+#ifdef CONFIG_KEYS
+	key_put(new->request_key_auth);
+	new->request_key_auth = NULL;
+#endif
+	/* tgcred will be cleared in our caller bc CLONE_THREAD won't be set */
 
-	new_ns = clone_user_ns(old_ns);
+	/* alloc_uid() incremented the userns refcount.  Just set it to 1 */
+	kref_set(&ns->kref, 1);
 
-	put_user_ns(old_ns);
-	return new_ns;
+	return 0;
 }
 
 void free_user_ns(struct kref *kref)
@@ -70,7 +65,7 @@ void free_user_ns(struct kref *kref)
 	struct user_namespace *ns;
 
 	ns = container_of(kref, struct user_namespace, kref);
-	release_uids(ns);
+	free_uid(ns->creator);
 	kfree(ns);
 }
 EXPORT_SYMBOL(free_user_ns);
diff --git a/kernel/utsname_sysctl.c b/kernel/utsname_sysctl.c
index 4ab9659d269e..3b34b3545936 100644
--- a/kernel/utsname_sysctl.c
+++ b/kernel/utsname_sysctl.c
@@ -60,7 +60,7 @@ static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
 
 #ifdef CONFIG_SYSCTL_SYSCALL
 /* The generic string strategy routine: */
-static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
+static int sysctl_uts_string(ctl_table *table,
 		  void __user *oldval, size_t __user *oldlenp,
 		  void __user *newval, size_t newlen)
 {
@@ -69,8 +69,7 @@ static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
 	write = newval && newlen;
 	memcpy(&uts_table, table, sizeof(uts_table));
 	uts_table.data = get_uts(table, write);
-	r = sysctl_string(&uts_table, name, nlen,
-		oldval, oldlenp, newval, newlen);
+	r = sysctl_string(&uts_table, oldval, oldlenp, newval, newlen);
 	put_uts(table, write, uts_table.data);
 	return r;
 }
diff --git a/kernel/wait.c b/kernel/wait.c
index c275c56cf2d3..cd87131f2fc2 100644
--- a/kernel/wait.c
+++ b/kernel/wait.c
@@ -72,12 +72,7 @@ prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state)
 	spin_lock_irqsave(&q->lock, flags);
 	if (list_empty(&wait->task_list))
 		__add_wait_queue(q, wait);
-	/*
-	 * don't alter the task state if this is just going to
-	 * queue an async wait queue callback
-	 */
-	if (is_sync_wait(wait))
-		set_current_state(state);
+	set_current_state(state);
 	spin_unlock_irqrestore(&q->lock, flags);
 }
 EXPORT_SYMBOL(prepare_to_wait);
@@ -91,12 +86,7 @@ prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_t *wait, int state)
 	spin_lock_irqsave(&q->lock, flags);
 	if (list_empty(&wait->task_list))
 		__add_wait_queue_tail(q, wait);
-	/*
-	 * don't alter the task state if this is just going to
- 	 * queue an async wait queue callback
-	 */
-	if (is_sync_wait(wait))
-		set_current_state(state);
+	set_current_state(state);
 	spin_unlock_irqrestore(&q->lock, flags);
 }
 EXPORT_SYMBOL(prepare_to_wait_exclusive);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 4048e92aa04f..4952322cba45 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -9,7 +9,7 @@
  * Derived from the taskqueue/keventd code by:
  *
  *   David Woodhouse <dwmw2@infradead.org>
- *   Andrew Morton <andrewm@uow.edu.au>
+ *   Andrew Morton
  *   Kai Petzke <wpp@marie.physik.tu-berlin.de>
  *   Theodore Ts'o <tytso@mit.edu>
  *
@@ -62,6 +62,7 @@ struct workqueue_struct {
 	const char *name;
 	int singlethread;
 	int freezeable;		/* Freeze threads during suspend */
+	int rt;
 #ifdef CONFIG_LOCKDEP
 	struct lockdep_map lockdep_map;
 #endif
@@ -83,21 +84,21 @@ static cpumask_t cpu_singlethread_map __read_mostly;
 static cpumask_t cpu_populated_map __read_mostly;
 
 /* If it's single threaded, it isn't in the list of workqueues. */
-static inline int is_single_threaded(struct workqueue_struct *wq)
+static inline int is_wq_single_threaded(struct workqueue_struct *wq)
 {
 	return wq->singlethread;
 }
 
 static const cpumask_t *wq_cpu_map(struct workqueue_struct *wq)
 {
-	return is_single_threaded(wq)
+	return is_wq_single_threaded(wq)
 		? &cpu_singlethread_map : &cpu_populated_map;
 }
 
 static
 struct cpu_workqueue_struct *wq_per_cpu(struct workqueue_struct *wq, int cpu)
 {
-	if (unlikely(is_single_threaded(wq)))
+	if (unlikely(is_wq_single_threaded(wq)))
 		cpu = singlethread_cpu;
 	return per_cpu_ptr(wq->cpu_wq, cpu);
 }
@@ -766,8 +767,9 @@ init_cpu_workqueue(struct workqueue_struct *wq, int cpu)
 
 static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
 {
+	struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
 	struct workqueue_struct *wq = cwq->wq;
-	const char *fmt = is_single_threaded(wq) ? "%s" : "%s/%d";
+	const char *fmt = is_wq_single_threaded(wq) ? "%s" : "%s/%d";
 	struct task_struct *p;
 
 	p = kthread_create(worker_thread, cwq, fmt, wq->name, cpu);
@@ -781,7 +783,8 @@ static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
 	 */
 	if (IS_ERR(p))
 		return PTR_ERR(p);
-
+	if (cwq->wq->rt)
+		sched_setscheduler_nocheck(p, SCHED_FIFO, &param);
 	cwq->thread = p;
 
 	return 0;
@@ -801,6 +804,7 @@ static void start_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
 struct workqueue_struct *__create_workqueue_key(const char *name,
 						int singlethread,
 						int freezeable,
+						int rt,
 						struct lock_class_key *key,
 						const char *lock_name)
 {
@@ -822,6 +826,7 @@ struct workqueue_struct *__create_workqueue_key(const char *name,
 	lockdep_init_map(&wq->lockdep_map, lock_name, key, 0);
 	wq->singlethread = singlethread;
 	wq->freezeable = freezeable;
+	wq->rt = rt;
 	INIT_LIST_HEAD(&wq->list);
 
 	if (singlethread) {
@@ -965,6 +970,51 @@ undo:
 	return ret;
 }
 
+#ifdef CONFIG_SMP
+struct work_for_cpu {
+	struct work_struct work;
+	long (*fn)(void *);
+	void *arg;
+	long ret;
+};
+
+static void do_work_for_cpu(struct work_struct *w)
+{
+	struct work_for_cpu *wfc = container_of(w, struct work_for_cpu, work);
+
+	wfc->ret = wfc->fn(wfc->arg);
+}
+
+/**
+ * work_on_cpu - run a function in user context on a particular cpu
+ * @cpu: the cpu to run on
+ * @fn: the function to run
+ * @arg: the function arg
+ *
+ * This will return -EINVAL in the cpu is not online, or the return value
+ * of @fn otherwise.
+ */
+long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
+{
+	struct work_for_cpu wfc;
+
+	INIT_WORK(&wfc.work, do_work_for_cpu);
+	wfc.fn = fn;
+	wfc.arg = arg;
+	get_online_cpus();
+	if (unlikely(!cpu_online(cpu)))
+		wfc.ret = -EINVAL;
+	else {
+		schedule_work_on(cpu, &wfc.work);
+		flush_work(&wfc.work);
+	}
+	put_online_cpus();
+
+	return wfc.ret;
+}
+EXPORT_SYMBOL_GPL(work_on_cpu);
+#endif /* CONFIG_SMP */
+
 void __init init_workqueues(void)
 {
 	cpu_populated_map = cpu_online_map;