From 4a6dae6d382e9edf3ff440b819e554ed706359bc Mon Sep 17 00:00:00 2001 From: Nick Piggin Date: Sun, 13 Nov 2005 16:07:24 -0800 Subject: [PATCH] atomic: cmpxchg Introduce an atomic_cmpxchg operation. Signed-off-by: Nick Piggin Cc: "Paul E. McKenney" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-x86_64/atomic.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/asm-x86_64') diff --git a/include/asm-x86_64/atomic.h b/include/asm-x86_64/atomic.h index fc4c5956e1ea..75c8a1e96737 100644 --- a/include/asm-x86_64/atomic.h +++ b/include/asm-x86_64/atomic.h @@ -360,6 +360,8 @@ static __inline__ int atomic_sub_return(int i, atomic_t *v) return atomic_add_return(-i,v); } +#define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new)) + #define atomic_inc_return(v) (atomic_add_return(1,v)) #define atomic_dec_return(v) (atomic_sub_return(1,v)) -- cgit v1.2.3