While only cosmetic for x86-64, this adjusts the cmpxchg code appearantly
inherited from i386 to use more generic constraints.
Signed-off-by: NJan Beulich <jbeulich@novell.com>
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>