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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-sparc64/atomic.h
parent53e86b91b7ae66d4c2757195cbd42e00d9199cf2 (diff)
downloadblackbird-op-linux-4a6dae6d382e9edf3ff440b819e554ed706359bc.tar.gz
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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-sparc64/atomic.h')
-rw-r--r--include/asm-sparc64/atomic.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-sparc64/atomic.h b/include/asm-sparc64/atomic.h
index e175afcf2cde..3a0b4383bbac 100644
--- a/include/asm-sparc64/atomic.h
+++ b/include/asm-sparc64/atomic.h
@@ -70,6 +70,8 @@ extern int atomic64_sub_ret(int, atomic64_t *);
#define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0)
#define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0)
+#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+
/* Atomic operations are already serializing */
#ifdef CONFIG_SMP
#define smp_mb__before_atomic_dec() membar_storeload_loadload();
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