[PATCH] atomic: cmpxchg

[pandora-kernel.git] / include / asm-x86_64 / atomic.h

diff --git a/include/asm-x86_64/atomic.h b/include/asm-x86_64/atomic.h
index fc4c595..75c8a1e 100644 (file)
--- a/include/asm-x86_64/atomic.h
+++ b/include/asm-x86_64/atomic.h
@@ -360,6 +360,8 @@ static __inline__ int atomic_sub_return(int i, atomic_t *v)
        return atomic_add_return(-i,v);
 }
 
+#define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
+
 #define atomic_inc_return(v)  (atomic_add_return(1,v))
 #define atomic_dec_return(v)  (atomic_sub_return(1,v))