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

[Ingo Molnar <mingo@elte.hu>]

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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