[PATCH] atomic: inc_not_zero

[powerpc.git] / include / asm-h8300 / atomic.h

diff --git a/include/asm-h8300/atomic.h b/include/asm-h8300/atomic.h
index d504392..f23d868 100644 (file)
--- a/include/asm-h8300/atomic.h
+++ b/include/asm-h8300/atomic.h
@@ -95,6 +95,20 @@ 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)
+
 static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
 {
        __asm__ __volatile__("stc ccr,r1l\n\t"