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2 Commits

Author SHA1 Message Date
Christoph Lameter
d7c3f8cee8 percpu: Omit segment prefix in the UP case for cmpxchg_double 
Omit the segment prefix in the UP case. GS is not used then
and we will generate segfaults if cmpxchg16b is used otherwise.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2011-03-27 19:25:36 -07:00
Christoph Lameter
b9ec40af0e percpu, x86: Add arch-specific this_cpu_cmpxchg_double() support 
Support this_cpu_cmpxchg_double() using the cmpxchg16b and cmpxchg8b
instructions.

-tj: s/percpu_cmpxchg16b/percpu_cmpxchg16b_double/ for consistency and
     other cosmetic changes.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
 2011-02-28 11:20:49 +01:00