Merge branch 'akpm' (patches from Andrew)

Merge more updates from Andrew Morton:

 - a bit more MM

 - procfs updates

 - dynamic-debug fixes

 - lib/ updates

 - checkpatch

 - epoll

 - nilfs2

 - signals

 - rapidio

 - PID management cleanup and optimization

 - kcov updates

 - sysvipc updates

 - quite a few misc things all over the place

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (94 commits)
  EXPERT Kconfig menu: fix broken EXPERT menu
  include/asm-generic/topology.h: remove unused parent_node() macro
  arch/tile/include/asm/topology.h: remove unused parent_node() macro
  arch/sparc/include/asm/topology_64.h: remove unused parent_node() macro
  arch/sh/include/asm/topology.h: remove unused parent_node() macro
  arch/ia64/include/asm/topology.h: remove unused parent_node() macro
  drivers/pcmcia/sa1111_badge4.c: avoid unused function warning
  mm: add infrastructure for get_user_pages_fast() benchmarking
  sysvipc: make get_maxid O(1) again
  sysvipc: properly name ipc_addid() limit parameter
  sysvipc: duplicate lock comments wrt ipc_addid()
  sysvipc: unteach ids->next_id for !CHECKPOINT_RESTORE
  initramfs: use time64_t timestamps
  drivers/watchdog: make use of devm_register_reboot_notifier()
  kernel/reboot.c: add devm_register_reboot_notifier()
  kcov: update documentation
  Makefile: support flag -fsanitizer-coverage=trace-cmp
  kcov: support comparison operands collection
  kcov: remove pointless current != NULL check
  kernel/panic.c: add TAINT_AUX
  ...

22 files changed, 109 insertions, 44 deletions

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index af2cc94a61bf..963b755d19b0 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -4,6 +4,8 @@
 
 #include <linux/compiler.h>
 
+#define CUT_HERE		"------------[ cut here ]------------\n"
+
 #ifdef CONFIG_GENERIC_BUG
 #define BUGFLAG_WARNING		(1 << 0)
 #define BUGFLAG_ONCE		(1 << 1)
@@ -90,10 +92,11 @@ extern void warn_slowpath_null(const char *file, const int line);
 #define __WARN_printf_taint(taint, arg...)				\
 	warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg)
 #else
+extern __printf(1, 2) void __warn_printk(const char *fmt, ...);
 #define __WARN()		__WARN_TAINT(TAINT_WARN)
-#define __WARN_printf(arg...)	do { printk(arg); __WARN(); } while (0)
+#define __WARN_printf(arg...)	do { __warn_printk(arg); __WARN(); } while (0)
 #define __WARN_printf_taint(taint, arg...)				\
-	do { printk(arg); __WARN_TAINT(taint); } while (0)
+	do { __warn_printk(arg); __WARN_TAINT(taint); } while (0)
 #endif
 
 /* used internally by panic.c */
@@ -130,7 +133,7 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
 
 #ifndef WARN_ON_ONCE
 #define WARN_ON_ONCE(condition)	({				\
-	static bool __section(.data.unlikely) __warned;		\
+	static bool __section(.data.once) __warned;		\
 	int __ret_warn_once = !!(condition);			\
 								\
 	if (unlikely(__ret_warn_once && !__warned)) {		\
@@ -142,7 +145,7 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
 #endif
 
 #define WARN_ONCE(condition, format...)	({			\
-	static bool __section(.data.unlikely) __warned;		\
+	static bool __section(.data.once) __warned;		\
 	int __ret_warn_once = !!(condition);			\
 								\
 	if (unlikely(__ret_warn_once && !__warned)) {		\
@@ -153,7 +156,7 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
 })
 
 #define WARN_TAINT_ONCE(condition, taint, format...)	({	\
-	static bool __section(.data.unlikely) __warned;		\
+	static bool __section(.data.once) __warned;		\
 	int __ret_warn_once = !!(condition);			\
 								\
 	if (unlikely(__ret_warn_once && !__warned)) {		\
diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index 6d9576931084..03cc5f9bba71 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -44,6 +44,7 @@ extern char __entry_text_start[], __entry_text_end[];
 extern char __start_rodata[], __end_rodata[];
 extern char __irqentry_text_start[], __irqentry_text_end[];
 extern char __softirqentry_text_start[], __softirqentry_text_end[];
+extern char __start_once[], __end_once[];
 
 /* Start and end of .ctors section - used for constructor calls. */
 extern char __ctors_start[], __ctors_end[];
diff --git a/include/asm-generic/topology.h b/include/asm-generic/topology.h
index 5d2add1a6c96..238873739550 100644
--- a/include/asm-generic/topology.h
+++ b/include/asm-generic/topology.h
@@ -44,9 +44,6 @@
 #define cpu_to_mem(cpu)		((void)(cpu),0)
 #endif
 
-#ifndef parent_node
-#define parent_node(node)	((void)(node),0)
-#endif
 #ifndef cpumask_of_node
   #ifdef CONFIG_NEED_MULTIPLE_NODES
     #define cpumask_of_node(node)	((node) == 0 ? cpu_online_mask : cpu_none_mask)
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index bdcd1caae092..ee8b707d9fa9 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -223,6 +223,9 @@
 	MEM_KEEP(init.data)						\
 	MEM_KEEP(exit.data)						\
 	*(.data.unlikely)						\
+	VMLINUX_SYMBOL(__start_once) = .;				\
+	*(.data.once)							\
+	VMLINUX_SYMBOL(__end_once) = .;					\
 	STRUCT_ALIGN();							\
 	*(__tracepoints)						\
 	/* implement dynamic printk debug */				\
diff --git a/include/linux/bitfield.h b/include/linux/bitfield.h
index f2deb71958b2..1030651f8309 100644
--- a/include/linux/bitfield.h
+++ b/include/linux/bitfield.h
@@ -15,7 +15,7 @@
 #ifndef _LINUX_BITFIELD_H
 #define _LINUX_BITFIELD_H
 
-#include <linux/bug.h>
+#include <linux/build_bug.h>
 
 /*
  * Bitfield access macros
diff --git a/include/linux/bug.h b/include/linux/bug.h
index da4231c905c8..fe5916550da8 100644
--- a/include/linux/bug.h
+++ b/include/linux/bug.h
@@ -43,6 +43,8 @@ enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
 /* These are defined by the architecture */
 int is_valid_bugaddr(unsigned long addr);
 
+void generic_bug_clear_once(void);
+
 #else	/* !CONFIG_GENERIC_BUG */
 
 static inline enum bug_trap_type report_bug(unsigned long bug_addr,
@@ -51,6 +53,9 @@ static inline enum bug_trap_type report_bug(unsigned long bug_addr,
 	return BUG_TRAP_TYPE_BUG;
 }
 
+
+static inline void generic_bug_clear_once(void) {}
+
 #endif	/* CONFIG_GENERIC_BUG */
 
 /*
diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
index a06583e41f80..3b609edffa8f 100644
--- a/include/linux/compiler-clang.h
+++ b/include/linux/compiler-clang.h
@@ -16,3 +16,6 @@
  * with any version that can compile the kernel
  */
 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
+
+#define randomized_struct_fields_start	struct {
+#define randomized_struct_fields_end	};
diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
index 6dfec4d638df..872f930f1b06 100644
--- a/include/linux/genalloc.h
+++ b/include/linux/genalloc.h
@@ -32,6 +32,7 @@
 
 #include <linux/types.h>
 #include <linux/spinlock_types.h>
+#include <linux/atomic.h>
 
 struct device;
 struct device_node;
@@ -71,7 +72,7 @@ struct gen_pool {
  */
 struct gen_pool_chunk {
 	struct list_head next_chunk;	/* next chunk in pool */
-	atomic_t avail;
+	atomic_long_t avail;
 	phys_addr_t phys_addr;		/* physical starting address of memory chunk */
 	unsigned long start_addr;	/* start address of memory chunk */
 	unsigned long end_addr;		/* end address of memory chunk (inclusive) */
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 8062e6cc607c..6a532629c983 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -105,7 +105,6 @@ extern struct group_info init_groups;
 	.numbers	= { {						\
 		.nr		= 0,					\
 		.ns		= &init_pid_ns,				\
-		.pid_chain	= { .next = NULL, .pprev = NULL },	\
 	}, }								\
 }
 
diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h
index d29e1e21bf3f..b1d861caca16 100644
--- a/include/linux/iopoll.h
+++ b/include/linux/iopoll.h
@@ -42,18 +42,21 @@
  */
 #define readx_poll_timeout(op, addr, val, cond, sleep_us, timeout_us)	\
 ({ \
-	ktime_t timeout = ktime_add_us(ktime_get(), timeout_us); \
-	might_sleep_if(sleep_us); \
+	u64 __timeout_us = (timeout_us); \
+	unsigned long __sleep_us = (sleep_us); \
+	ktime_t __timeout = ktime_add_us(ktime_get(), __timeout_us); \
+	might_sleep_if((__sleep_us) != 0); \
 	for (;;) { \
 		(val) = op(addr); \
 		if (cond) \
 			break; \
-		if (timeout_us && ktime_compare(ktime_get(), timeout) > 0) { \
+		if (__timeout_us && \
+		    ktime_compare(ktime_get(), __timeout) > 0) { \
 			(val) = op(addr); \
 			break; \
 		} \
-		if (sleep_us) \
-			usleep_range((sleep_us >> 2) + 1, sleep_us); \
+		if (__sleep_us) \
+			usleep_range((__sleep_us >> 2) + 1, __sleep_us); \
 	} \
 	(cond) ? 0 : -ETIMEDOUT; \
 })
@@ -77,17 +80,20 @@
  */
 #define readx_poll_timeout_atomic(op, addr, val, cond, delay_us, timeout_us) \
 ({ \
-	ktime_t timeout = ktime_add_us(ktime_get(), timeout_us); \
+	u64 __timeout_us = (timeout_us); \
+	unsigned long __delay_us = (delay_us); \
+	ktime_t __timeout = ktime_add_us(ktime_get(), __timeout_us); \
 	for (;;) { \
 		(val) = op(addr); \
 		if (cond) \
 			break; \
-		if (timeout_us && ktime_compare(ktime_get(), timeout) > 0) { \
+		if (__timeout_us && \
+		    ktime_compare(ktime_get(), __timeout) > 0) { \
 			(val) = op(addr); \
 			break; \
 		} \
-		if (delay_us) \
-			udelay(delay_us);	\
+		if (__delay_us) \
+			udelay(__delay_us);	\
 	} \
 	(cond) ? 0 : -ETIMEDOUT; \
 })
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
index 474812abe773..b5630c8eb2f3 100644
--- a/include/linux/ipc_namespace.h
+++ b/include/linux/ipc_namespace.h
@@ -19,7 +19,10 @@ struct ipc_ids {
 	bool tables_initialized;
 	struct rw_semaphore rwsem;
 	struct idr ipcs_idr;
+	int max_id;
+#ifdef CONFIG_CHECKPOINT_RESTORE
 	int next_id;
+#endif
 	struct rhashtable key_ht;
 };
 
diff --git a/include/linux/kcov.h b/include/linux/kcov.h
index f5d8ce4f4f86..3ecf6f5e3a5f 100644
--- a/include/linux/kcov.h
+++ b/include/linux/kcov.h
@@ -8,19 +8,23 @@ struct task_struct;
 
 #ifdef CONFIG_KCOV
 
-void kcov_task_init(struct task_struct *t);
-void kcov_task_exit(struct task_struct *t);
-
 enum kcov_mode {
 	/* Coverage collection is not enabled yet. */
 	KCOV_MODE_DISABLED = 0,
+	/* KCOV was initialized, but tracing mode hasn't been chosen yet. */
+	KCOV_MODE_INIT = 1,
 	/*
 	 * Tracing coverage collection mode.
 	 * Covered PCs are collected in a per-task buffer.
 	 */
-	KCOV_MODE_TRACE = 1,
+	KCOV_MODE_TRACE_PC = 2,
+	/* Collecting comparison operands mode. */
+	KCOV_MODE_TRACE_CMP = 3,
 };
 
+void kcov_task_init(struct task_struct *t);
+void kcov_task_exit(struct task_struct *t);
+
 #else
 
 static inline void kcov_task_init(struct task_struct *t) {}
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 4b484ab9e163..ce51455e2adf 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -549,7 +549,8 @@ extern enum system_states {
 #define TAINT_UNSIGNED_MODULE		13
 #define TAINT_SOFTLOCKUP		14
 #define TAINT_LIVEPATCH			15
-#define TAINT_FLAGS_COUNT		16
+#define TAINT_AUX			16
+#define TAINT_FLAGS_COUNT		17
 
 struct taint_flag {
 	char c_true;	/* character printed when tainted */
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index 15cab3967d6d..1fbde8a880d9 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -104,9 +104,16 @@ extern nodemask_t _unused_nodemask_arg_;
  *
  * Can be used to provide arguments for '%*pb[l]' when printing a nodemask.
  */
-#define nodemask_pr_args(maskp)				\
-	((maskp) != NULL) ? MAX_NUMNODES : 0,		\
-	((maskp) != NULL) ? (maskp)->bits : NULL
+#define nodemask_pr_args(maskp)	__nodemask_pr_numnodes(maskp), \
+				__nodemask_pr_bits(maskp)
+static inline unsigned int __nodemask_pr_numnodes(const nodemask_t *m)
+{
+	return m ? MAX_NUMNODES : 0;
+}
+static inline const unsigned long *__nodemask_pr_bits(const nodemask_t *m)
+{
+	return m ? m->bits : NULL;
+}
 
 /*
  * The inline keyword gives the compiler room to decide to inline, or
diff --git a/include/linux/pageblock-flags.h b/include/linux/pageblock-flags.h
index e942558b3585..9132c5cb41f1 100644
--- a/include/linux/pageblock-flags.h
+++ b/include/linux/pageblock-flags.h
@@ -96,6 +96,17 @@ void set_pfnblock_flags_mask(struct page *page,
 #define set_pageblock_skip(page) \
 			set_pageblock_flags_group(page, 1, PB_migrate_skip,  \
 							PB_migrate_skip)
+#else
+static inline bool get_pageblock_skip(struct page *page)
+{
+	return false;
+}
+static inline void clear_pageblock_skip(struct page *page)
+{
+}
+static inline void set_pageblock_skip(struct page *page)
+{
+}
 #endif /* CONFIG_COMPACTION */
 
 #endif	/* PAGEBLOCK_FLAGS_H */
diff --git a/include/linux/pid.h b/include/linux/pid.h
index dfd684ce0787..7633d55d9a24 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -51,10 +51,8 @@ enum pid_type
  */
 
 struct upid {
-	/* Try to keep pid_chain in the same cacheline as nr for find_vpid */
 	int nr;
 	struct pid_namespace *ns;
-	struct hlist_node pid_chain;
 };
 
 struct pid
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index c78af6061644..49538b172483 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -10,15 +10,8 @@
 #include <linux/nsproxy.h>
 #include <linux/kref.h>
 #include <linux/ns_common.h>
+#include <linux/idr.h>
 
-struct pidmap {
-       atomic_t nr_free;
-       void *page;
-};
-
-#define BITS_PER_PAGE		(PAGE_SIZE * 8)
-#define BITS_PER_PAGE_MASK	(BITS_PER_PAGE-1)
-#define PIDMAP_ENTRIES		((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
 
 struct fs_pin;
 
@@ -30,10 +23,9 @@ enum { /* definitions for pid_namespace's hide_pid field */
 
 struct pid_namespace {
 	struct kref kref;
-	struct pidmap pidmap[PIDMAP_ENTRIES];
+	struct idr idr;
 	struct rcu_head rcu;
-	int last_pid;
-	unsigned int nr_hashed;
+	unsigned int pid_allocated;
 	struct task_struct *child_reaper;
 	struct kmem_cache *pid_cachep;
 	unsigned int level;
@@ -57,7 +49,7 @@ struct pid_namespace {
 
 extern struct pid_namespace init_pid_ns;
 
-#define PIDNS_HASH_ADDING (1U << 31)
+#define PIDNS_ADDING (1U << 31)
 
 #ifdef CONFIG_PID_NS
 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
@@ -106,6 +98,6 @@ static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
 
 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
 void pidhash_init(void);
-void pidmap_init(void);
+void pid_idr_init(void);
 
 #endif /* _LINUX_PID_NS_H */
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 6a80cfc63e0c..2dc5e9870fcd 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -191,5 +191,6 @@ long pipe_fcntl(struct file *, unsigned int, unsigned long arg);
 struct pipe_inode_info *get_pipe_info(struct file *file);
 
 int create_pipe_files(struct file **, int);
+unsigned int round_pipe_size(unsigned int size);
 
 #endif
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 0ca448c1cb42..23a9c89c7ad9 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -22,7 +22,6 @@
 #define _LINUX_RADIX_TREE_H
 
 #include <linux/bitops.h>
-#include <linux/bug.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/preempt.h>
diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index d03da0eb95ca..e63799a6e895 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -6,6 +6,8 @@
 #include <linux/notifier.h>
 #include <uapi/linux/reboot.h>
 
+struct device;
+
 #define SYS_DOWN	0x0001	/* Notify of system down */
 #define SYS_RESTART	SYS_DOWN
 #define SYS_HALT	0x0002	/* Notify of system halt */
@@ -39,6 +41,8 @@ extern int reboot_force;
 extern int register_reboot_notifier(struct notifier_block *);
 extern int unregister_reboot_notifier(struct notifier_block *);
 
+extern int devm_register_reboot_notifier(struct device *, struct notifier_block *);
+
 extern int register_restart_handler(struct notifier_block *);
 extern int unregister_restart_handler(struct notifier_block *);
 extern void do_kernel_restart(char *cmd);
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index b769ecfcc3bd..992bc9948232 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -51,6 +51,9 @@ extern int proc_dointvec_minmax(struct ctl_table *, int,
 extern int proc_douintvec_minmax(struct ctl_table *table, int write,
 				 void __user *buffer, size_t *lenp,
 				 loff_t *ppos);
+extern int proc_dopipe_max_size(struct ctl_table *table, int write,
+				void __user *buffer, size_t *lenp,
+				loff_t *ppos);
 extern int proc_dointvec_jiffies(struct ctl_table *, int,
 				 void __user *, size_t *, loff_t *);
 extern int proc_dointvec_userhz_jiffies(struct ctl_table *, int,
diff --git a/include/uapi/linux/kcov.h b/include/uapi/linux/kcov.h
index 33eabbb8ada1..9529867717a8 100644
--- a/include/uapi/linux/kcov.h
+++ b/include/uapi/linux/kcov.h
@@ -8,4 +8,28 @@
 #define KCOV_ENABLE			_IO('c', 100)
 #define KCOV_DISABLE			_IO('c', 101)
 
+enum {
+	/*
+	 * Tracing coverage collection mode.
+	 * Covered PCs are collected in a per-task buffer.
+	 * In new KCOV version the mode is chosen by calling
+	 * ioctl(fd, KCOV_ENABLE, mode). In older versions the mode argument
+	 * was supposed to be 0 in such a call. So, for reasons of backward
+	 * compatibility, we have chosen the value KCOV_TRACE_PC to be 0.
+	 */
+	KCOV_TRACE_PC = 0,
+	/* Collecting comparison operands mode. */
+	KCOV_TRACE_CMP = 1,
+};
+
+/*
+ * The format for the types of collected comparisons.
+ *
+ * Bit 0 shows whether one of the arguments is a compile-time constant.
+ * Bits 1 & 2 contain log2 of the argument size, up to 8 bytes.
+ */
+#define KCOV_CMP_CONST          (1 << 0)
+#define KCOV_CMP_SIZE(n)        ((n) << 1)
+#define KCOV_CMP_MASK           KCOV_CMP_SIZE(3)
+
 #endif /* _LINUX_KCOV_IOCTLS_H */