1 files changed, 16 insertions, 0 deletions

diff --git a/include/asm-v850/atomic.h b/include/asm-v850/atomic.h
index e497166ca42b..bede3172ce7f 100644
--- a/include/asm-v850/atomic.h
+++ b/include/asm-v850/atomic.h
@@ -104,6 +104,22 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
         return ret;
 }
 
+static inline int atomic_add_unless(atomic_t *v, int a, int u)
+{
+        int ret;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        ret = v->counter;
+        if (ret != u)
+                v->counter += a;
+        local_irq_restore(flags);
+
+        return ret != u;
+}
+
+#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
+
 /* Atomic operations are already serializing on ARM */
 #define smp_mb__before_atomic_dec()     barrier()
 #define smp_mb__after_atomic_dec()      barrier()