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authorNick Piggin <nickpiggin@yahoo.com.au>2005-11-13 19:07:24 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-13 21:14:16 -0500
commit4a6dae6d382e9edf3ff440b819e554ed706359bc (patch)
tree2945a5095973e2ecf05b503d6deb859083045b8e /include/asm-x86_64/atomic.h
parent53e86b91b7ae66d4c2757195cbd42e00d9199cf2 (diff)
[PATCH] atomic: cmpxchg
Introduce an atomic_cmpxchg operation. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64/atomic.h')
-rw-r--r--include/asm-x86_64/atomic.h2
1 files changed, 2 insertions, 0 deletions
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)
360 return atomic_add_return(-i,v); 360 return atomic_add_return(-i,v);
361} 361}
362 362
363#define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
364
363#define atomic_inc_return(v) (atomic_add_return(1,v)) 365#define atomic_inc_return(v) (atomic_add_return(1,v))
364#define atomic_dec_return(v) (atomic_sub_return(1,v)) 366#define atomic_dec_return(v) (atomic_sub_return(1,v))
365 367