Re: [PATCH v10 1/4] qrwlock: A queue read/write lock implementation
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: 2014-01-23 17:15:41
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On Thu, Jan 23, 2014 at 9:12 AM, Waiman Long [off-list ref] wrote:
I thought that all atomic RMW instructions are memory barrier.
On x86 they are. Not necessarily elsewhere.
If they are not, what kind of barrier should be added?
smp_mb__before_atomic_xyz() and smp_mb__after_atomic_xyz() will do it,
and are no-op (well, barriers - I don't think it matters) on x86.
Linus