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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-13 20:27:28 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-13 20:27:28 +0300 |
| commit | cc76ee75a9d3201eeacc576d17fbc1511f673010 (patch) | |
| tree | 9505405c270718c491840ae7d0da0521386ce939 /lib | |
| parent | 9c65e12a55fea2da50f4069ec0dc47c50b7bd2bb (diff) | |
| parent | 58995a9a5b292458f94a2356b8c878230fa56fe0 (diff) | |
| download | linux-cc76ee75a9d3201eeacc576d17fbc1511f673010.tar.xz | |
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull core locking changes from Ingo Molnar:
"Main changes:
- jump label asm preparatory work for PowerPC (Anton Blanchard)
- rwsem optimizations and cleanups (Davidlohr Bueso)
- mutex optimizations and cleanups (Jason Low)
- futex fix (Oleg Nesterov)
- remove broken atomicity checks from {READ,WRITE}_ONCE() (Peter
Zijlstra)"
* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
powerpc, jump_label: Include linux/jump_label.h to get HAVE_JUMP_LABEL define
jump_label: Allow jump labels to be used in assembly
jump_label: Allow asm/jump_label.h to be included in assembly
locking/mutex: Further simplify mutex_spin_on_owner()
locking: Remove atomicy checks from {READ,WRITE}_ONCE
locking/rtmutex: Rename argument in the rt_mutex_adjust_prio_chain() documentation as well
locking/rwsem: Fix lock optimistic spinning when owner is not running
locking: Remove ACCESS_ONCE() usage
locking/rwsem: Check for active lock before bailing on spinning
locking/rwsem: Avoid deceiving lock spinners
locking/rwsem: Set lock ownership ASAP
locking/rwsem: Document barrier need when waking tasks
locking/futex: Check PF_KTHREAD rather than !p->mm to filter out kthreads
locking/mutex: Refactor mutex_spin_on_owner()
locking/mutex: In mutex_spin_on_owner(), return true when owner changes
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/lockref.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/lockref.c b/lib/lockref.c index ecb9a665ec19..494994bf17c8 100644 --- a/lib/lockref.c +++ b/lib/lockref.c @@ -18,7 +18,7 @@ #define CMPXCHG_LOOP(CODE, SUCCESS) do { \ struct lockref old; \ BUILD_BUG_ON(sizeof(old) != 8); \ - old.lock_count = ACCESS_ONCE(lockref->lock_count); \ + old.lock_count = READ_ONCE(lockref->lock_count); \ while (likely(arch_spin_value_unlocked(old.lock.rlock.raw_lock))) { \ struct lockref new = old, prev = old; \ CODE \ |