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-m68k/atomic.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/asm-m68k') diff --git a/include/asm-m68k/atomic.h b/include/asm-m68k/atomic.h index 38f3043e7fe1..b821975a361a 100644 --- a/include/asm-m68k/atomic.h +++ b/include/asm-m68k/atomic.h @@ -139,6 +139,8 @@ static inline void atomic_set_mask(unsigned long mask, unsigned long *v) __asm__ __volatile__("orl %1,%0" : "+m" (*v) : "id" (mask)); } +#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) + /* Atomic operations are already serializing */ #define smp_mb__before_atomic_dec() barrier() #define smp_mb__after_atomic_dec() barrier() -- cgit v1.2.3