[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-alpha/atomic.h b/include/asm-alpha/atomic.h
index cd253c8c6c7b..568f96f2babd 100644
--- a/include/asm-alpha/atomic.h
+++ b/include/asm-alpha/atomic.h
@@ -115,6 +115,8 @@ static __inline__ long atomic_add_return(int i, atomic_t * v)
 	return result;
 }
 
+#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
+
 static __inline__ long atomic64_add_return(long i, atomic64_t * v)
 {
 	long temp, result;