[PATCH] Implement atomic_add_negative() on various architectures

Lots of architectures have atomic_add_return() and no atomic_add_negative().

We can implement the latter in terms of the former.

1 files changed, 2 insertions, 0 deletions

diff --git a/include/asm-ppc64/atomic.h b/include/asm-ppc64/atomic.h
index 00617e2185af..39b11781a69d 100644
--- a/include/asm-ppc64/atomic.h
+++ b/include/asm-ppc64/atomic.h
@@ -54,6 +54,8 @@ static __inline__ int atomic_add_return(int a, atomic_t *v)
 	return t;
 }
 
+#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
+
 static __inline__ void atomic_sub(int a, atomic_t *v)
 {
 	int t;