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Subject[patch 02/15] Generic Mutex Subsystem, add-atomic-xchg-x86_64.patch

add atomic_cmpxchg() to x86_64. Needed by the new mutex code.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

----

include/asm-x86_64/atomic.h | 1 +
1 files changed, 1 insertion(+)

Index: linux/include/asm-x86_64/atomic.h
===================================================================
--- linux.orig/include/asm-x86_64/atomic.h
+++ linux/include/asm-x86_64/atomic.h
@@ -389,6 +389,7 @@ static __inline__ long atomic64_sub_retu
#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
-
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