2 files changed, 16 insertions, 2 deletions

diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h
index 7f84414c5f53..bd18bfd78e9b 100644
--- a/include/asm-generic/atomic.h
+++ b/include/asm-generic/atomic.h
@@ -129,13 +129,13 @@ static inline void atomic_dec(atomic_t *v)
 
 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
 
-static inline int atomic_add_unless(atomic_t *v, int a, int u)
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
 {
   int c, old;
   c = atomic_read(v);
   while (c != u && (old = atomic_cmpxchg(v, c, c + a)) != c)
     c = old;
-  return c != u;
+  return c;
 }
 
 static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
diff --git a/include/linux/atomic.h b/include/linux/atomic.h
index 66fed6364122..d5e167a6a398 100644
--- a/include/linux/atomic.h
+++ b/include/linux/atomic.h
@@ -3,6 +3,20 @@
 #include <asm/atomic.h>
 
 /**
+ * atomic_add_unless - add unless the number is already a given value
+ * @v: pointer of type atomic_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, so long as @v was not already @u.
+ * Returns non-zero if @v was not @u, and zero otherwise.
+ */
+static inline int atomic_add_unless(atomic_t *v, int a, int u)
+{
+        return __atomic_add_unless(v, a, u) != u;
+}
+
+/**
  * atomic_inc_not_zero - increment unless the number is zero
  * @v: pointer of type atomic_t
  *