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| author | Nick Piggin <nickpiggin@yahoo.com.au> | 2005-11-13 16:07:24 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-13 18:14:16 -0800 |
| commit | 4a6dae6d382e9edf3ff440b819e554ed706359bc (patch) | |
| tree | 2945a5095973e2ecf05b503d6deb859083045b8e /include/asm-xtensa | |
| parent | 53e86b91b7ae66d4c2757195cbd42e00d9199cf2 (diff) | |
| download | lwn-4a6dae6d382e9edf3ff440b819e554ed706359bc.tar.gz lwn-4a6dae6d382e9edf3ff440b819e554ed706359bc.zip | |
[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')
| -rw-r--r-- | include/asm-xtensa/atomic.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-xtensa/atomic.h b/include/asm-xtensa/atomic.h index 12b5732dc6e5..cd40c5e75160 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) { |