Re: [PATCH] x86: cmpxchg_double: Add missing memory clobber

[Peter Zijlstra]

On Tue, Oct 06, 2015 at 02:39:02PM -0700, H. Peter Anvin wrote:

> However, I think one of the major uses for cmpxchg_double() is for page
> table manipulation, and for that it isn't clear that a compiler barrier
> is needed nor desired.

See mm/slub.c, that uses cmpxchg_double() (the LOCK prefixed one) and
one would expect that to also include a compiler barrier.
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