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[PATCH] x86-64: Lose constraints on cmpxchg 

While only cosmetic for x86-64, this adjusts the cmpxchg code appearantly
inherited from i386 to use more generic constraints.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jan Beulich 2005-09-12 18:49:24 +02:00 committed by Linus Torvalds
parent 1a426cb764
commit a2d236b3ac
1 changed files with 3 additions and 3 deletions
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6
include/asm-x86_64/system.h
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@ -253,19 +253,19 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
case 2:
__asm__ __volatile__(LOCK_PREFIX "cmpxchgw %w1,%2"
: "=a"(prev)
: "q"(new), "m"(*__xg(ptr)), "0"(old)
: "r"(new), "m"(*__xg(ptr)), "0"(old)
: "memory");
return prev;
case 4:
__asm__ __volatile__(LOCK_PREFIX "cmpxchgl %k1,%2"
: "=a"(prev)
: "q"(new), "m"(*__xg(ptr)), "0"(old)
: "r"(new), "m"(*__xg(ptr)), "0"(old)
: "memory");
return prev;
case 8:
__asm__ __volatile__(LOCK_PREFIX "cmpxchgq %1,%2"
: "=a"(prev)
: "q"(new), "m"(*__xg(ptr)), "0"(old)
: "r"(new), "m"(*__xg(ptr)), "0"(old)
: "memory");
return prev;
}