linux-kernel - [PATCH 1/2] atomic: Allow atomic_inc_not

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Date:	Thu, 1 Mar 2012 18:09:53 +1100
From:	Anton Blanchard <anton@...ba.org>
To:	benh@...nel.crashing.org, paulus@...ba.org,
	akpm@...ux-foundation.org, asharma@...com, vapier@...too.org,
	eric.dumazet@...il.com, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] 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 <anton@...ba.org>
---

Index: linux-build/include/linux/atomic.h
===================================================================
--- linux-build.orig/include/linux/atomic.h	2012-02-11 14:59:23.284714257 +1100
+++ linux-build/include/linux/atomic.h	2012-02-11 15:01:14.894764555 +1100
@@ -24,7 +24,9 @@ static inline int atomic_add_unless(atom
  * 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
--
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