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authorNick Piggin <nickpiggin@yahoo.com.au>2005-11-13 16:07:24 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-13 18:14:16 -0800
commit4a6dae6d382e9edf3ff440b819e554ed706359bc (patch)
tree2945a5095973e2ecf05b503d6deb859083045b8e /include/asm-xtensa/atomic.h
parent53e86b91b7ae66d4c2757195cbd42e00d9199cf2 (diff)
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[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-xtensa/atomic.h')
-rw-r--r--include/asm-xtensa/atomic.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-xtensa/atomic.h b/include/asm-xtensa/atomic.h
index 12b5732..cd40c5e 100644
--- a/include/asm-xtensa/atomic.h
+++ b/include/asm-xtensa/atomic.h
@@ -223,6 +223,7 @@ static inline int atomic_sub_return(int i, atomic_t * v)
*/
#define atomic_add_negative(i,v) (atomic_add_return((i),(v)) < 0)
+#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
{
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