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authorIngo Molnar <mingo@elte.hu>2006-01-09 15:59:17 -0800
committerIngo Molnar <mingo@hera.kernel.org>2006-01-09 15:59:17 -0800
commitffbf670f5cd50501a34a5187981460da2216071e (patch)
treef2cd9eeeb59839d15feddf906310bb375474c573 /include/asm-x86_64
parentf17578decc40df8fceff82b106582e30bdfb3189 (diff)
[PATCH] mutex subsystem, add atomic_xchg() to all arches
add atomic_xchg() to all the architectures. Needed by the new mutex code. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Diffstat (limited to 'include/asm-x86_64')
-rw-r--r--include/asm-x86_64/atomic.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-x86_64/atomic.h b/include/asm-x86_64/atomic.h
index 72eb071488c..6b540237a2f 100644
--- a/include/asm-x86_64/atomic.h
+++ b/include/asm-x86_64/atomic.h
@@ -389,6 +389,7 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t *v)
#define atomic64_dec_return(v) (atomic64_sub_return(1,v))
#define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
/**
* atomic_add_unless - add unless the number is a given value