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x86, asm: Clean up and simplify <asm/cmpxchg.h>
authorH. Peter Anvin <hpa@linux.intel.com>
Wed, 28 Jul 2010 22:18:35 +0000 (15:18 -0700)
committerH. Peter Anvin <hpa@linux.intel.com>
Wed, 28 Jul 2010 22:24:09 +0000 (15:24 -0700)
commit4532b305e8f0c238dd73048068ff8a6dd1380291
treee4f9e4d78385dc45ab2456edf02ab515442f1cc1tree | snapshot (tar.bz2 tar.gz zip)
parent69309a05907546fb686b251d4ab041c26afe1e1dcommit | diff
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>
arch/x86/include/asm/cmpxchg_32.h diff | blob | blame | history
arch/x86/include/asm/cmpxchg_64.h diff | blob | blame | history
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