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Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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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"
This commit is contained in:
Linus Torvalds
2013-07-02 16:07:52 -07:00
parent 42daabf62b 88c8004fd3
commit 3e42dee676
5 changed files with 53 additions and 5 deletions
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6
kernel/Kconfig.locks
View File

@@ -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

6
kernel/futex.c
View File

@@ -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 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, int rw)
} 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);
}

13
kernel/rtmutex.c
View File

@@ -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,