diff options
| author | Will Deacon <will.deacon@arm.com> | 2015-07-16 16:10:06 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-08-03 10:57:09 +0200 |
| commit | ed2de9f74ecbbf3063d29b2334e7b455d7f35189 (patch) | |
| tree | b72f333309835d9b23c695d2921c965627746c69 /kernel/locking/qspinlock_paravirt.h | |
| parent | 0b792bf519e68108d577fcec815ab50913787012 (diff) | |
locking/Documentation: Clarify failed cmpxchg() memory ordering semantics
A failed cmpxchg does not provide any memory ordering guarantees, a
property that is used to optimise the cmpxchg implementations on Alpha,
PowerPC and arm64.
This patch updates atomic_ops.txt and memory-barriers.txt to reflect
this.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Douglas Hatch <doug.hatch@hp.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Scott J Norton <scott.norton@hp.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman Long <waiman.long@hp.com>
Link: http://lkml.kernel.org/r/20150716151006.GH26390@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/locking/qspinlock_paravirt.h')
0 files changed, 0 insertions, 0 deletions