atomic: Allow atomic_inc_not_zero to be overridden

We want to implement a ppc64 specific version of atomic_inc_not_zero
so wrap it in an ifdef to allow it to be overridden.

Signed-off-by: Anton Blanchard <[email protected]>
Acked-by: Mike Frysinger <[email protected]>
Signed-off-by: Benjamin Herrenschmidt <[email protected]>

diff --git a/include/linux/atomic.h b/include/linux/atomic.h
index 42b77b5446d2b44d983d68c0929de5dabac6afa2..70cfcb2d63c49d5b5b72f6a5f42455060d89035d 100644 (file)
--- a/include/linux/atomic.h
+++ b/include/linux/atomic.h
@@ -24,7 +24,9 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
  * Atomically increments @v by 1, so long as @v is non-zero.
  * Returns non-zero if @v was non-zero, and zero otherwise.
  */
+#ifndef atomic_inc_not_zero
 #define atomic_inc_not_zero(v)         atomic_add_unless((v), 1, 0)
+#endif
 
 /**
  * atomic_inc_not_zero_hint - increment if not null