From: H. Peter Anvin <hpa@linux.intel.com>
Date: Wed, 28 Jul 2010 22:18:35 +0000 (-0700)
Subject: x86, asm: Clean up and simplify <asm/cmpxchg.h>
X-Git-Tag: v2.6.36-rc1~526^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4532b305e8f0c238dd73048068ff8a6dd1380291;p=pandora-kernel.git

x86, asm: Clean up and simplify <asm/cmpxchg.h>

Remove the __xg() hack to create a memory barrier near xchg and
cmpxchg; it has been there since 1.3.11 but should not be necessary
with "asm volatile" and a "memory" clobber, neither of which were
there in the original implementation.

However, we *should* make this a volatile reference.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
LKML-Reference: <AANLkTikAmaDPji-TVDarmG1yD=fwbffcsmEU=YEuP+8r@mail.gmail.com>
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