[PATCH] x86-64: Fix constraints in atomic_add_return()

Following i386 from Duncan Sands
Signed-off-by: Andi Kleen <ak@suse.de>

include/asm-x86_64/atomic.h

@@ -189,9 +189,9 @@ static __inline__ int atomic_add_return(int i, atomic_t *v)
 {
 	int __i = i;
 	__asm__ __volatile__(
-		LOCK_PREFIX "xaddl %0, %1;"
-		:"=r"(i)
-		:"m"(v->counter), "0"(i));
+		LOCK_PREFIX "xaddl %0, %1"
+		:"+r" (i), "+m" (v->counter)
+		: : "memory");
 	return i + __i;
 }