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authorLinus Torvalds <torvalds@linux-foundation.org>2013-07-02 16:07:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-02 16:07:52 -0700
commit3e42dee676e8cf5adca817b1518b2e99d1c138ff (patch)
tree23580fe97d1e452667b507c2aadb99877d0b574c /kernel
parent42daabf62bfa3c00974b43f030dadcf704c0db59 (diff)
parent88c8004fd3a5fdd2378069de86b90b21110d33a4 (diff)
downloadlinux-3e42dee676e8cf5adca817b1518b2e99d1c138ff.tar.bz2
Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking changes from Ingo Molnar: "Four miscellanous standalone fixes for futexes, rtmutexes and Kconfig.locks." * 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: futex: Use freezable blocking call futex: Take hugepages into account when generating futex_key rtmutex: Document rt_mutex_adjust_prio_chain() locking: Fix copy/paste errors of "ARCH_INLINE_*_UNLOCK_BH"
Diffstat (limited to 'kernel')
-rw-r--r--kernel/Kconfig.locks6
-rw-r--r--kernel/futex.c6
-rw-r--r--kernel/rtmutex.c13
3 files changed, 20 insertions, 5 deletions
diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
index 44511d100eaa..d2b32ac27a39 100644
--- a/kernel/Kconfig.locks
+++ b/kernel/Kconfig.locks
@@ -138,7 +138,7 @@ config INLINE_SPIN_UNLOCK_BH
config INLINE_SPIN_UNLOCK_IRQ
def_bool y
- depends on !PREEMPT || ARCH_INLINE_SPIN_UNLOCK_BH
+ depends on !PREEMPT || ARCH_INLINE_SPIN_UNLOCK_IRQ
config INLINE_SPIN_UNLOCK_IRQRESTORE
def_bool y
@@ -175,7 +175,7 @@ config INLINE_READ_UNLOCK_BH
config INLINE_READ_UNLOCK_IRQ
def_bool y
- depends on !PREEMPT || ARCH_INLINE_READ_UNLOCK_BH
+ depends on !PREEMPT || ARCH_INLINE_READ_UNLOCK_IRQ
config INLINE_READ_UNLOCK_IRQRESTORE
def_bool y
@@ -212,7 +212,7 @@ config INLINE_WRITE_UNLOCK_BH
config INLINE_WRITE_UNLOCK_IRQ
def_bool y
- depends on !PREEMPT || ARCH_INLINE_WRITE_UNLOCK_BH
+ depends on !PREEMPT || ARCH_INLINE_WRITE_UNLOCK_IRQ
config INLINE_WRITE_UNLOCK_IRQRESTORE
def_bool y
diff --git a/kernel/futex.c b/kernel/futex.c
index b26dcfc02c94..c3a1a55a5214 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -61,6 +61,8 @@
#include <linux/nsproxy.h>
#include <linux/ptrace.h>
#include <linux/sched/rt.h>
+#include <linux/hugetlb.h>
+#include <linux/freezer.h>
#include <asm/futex.h>
@@ -365,7 +367,7 @@ again:
} else {
key->both.offset |= FUT_OFF_INODE; /* inode-based key */
key->shared.inode = page_head->mapping->host;
- key->shared.pgoff = page_head->index;
+ key->shared.pgoff = basepage_index(page);
}
get_futex_key_refs(key);
@@ -1807,7 +1809,7 @@ static void futex_wait_queue_me(struct futex_hash_bucket *hb, struct futex_q *q,
* is no timeout, or if it has yet to expire.
*/
if (!timeout || timeout->task)
- schedule();
+ freezable_schedule();
}
__set_current_state(TASK_RUNNING);
}
diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index 1e09308bf2a1..0dd6aec1cb6a 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -145,6 +145,19 @@ int max_lock_depth = 1024;
/*
* Adjust the priority chain. Also used for deadlock detection.
* Decreases task's usage by one - may thus free the task.
+ *
+ * @task: the task owning the mutex (owner) for which a chain walk is probably
+ * needed
+ * @deadlock_detect: do we have to carry out deadlock detection?
+ * @orig_lock: the mutex (can be NULL if we are walking the chain to recheck
+ * things for a task that has just got its priority adjusted, and
+ * is waiting on a mutex)
+ * @orig_waiter: rt_mutex_waiter struct for the task that has just donated
+ * its priority to the mutex owner (can be NULL in the case
+ * depicted above or if the top waiter is gone away and we are
+ * actually deboosting the owner)
+ * @top_task: the current top waiter
+ *
* Returns 0 or -EDEADLK.
*/
static int rt_mutex_adjust_prio_chain(struct task_struct *task,