linux-kernel - [PATCHv4 09/11] memcg: Use *_dec_not_zero instead of *_add

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Message-Id: <1311760070-21532-9-git-send-email-sven@narfation.org>
Date:	Wed, 27 Jul 2011 11:47:48 +0200
From:	Sven Eckelmann <sven@...fation.org>
To:	linux-arch@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Sven Eckelmann <sven@...fation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org
Subject: [PATCHv4 09/11] memcg: Use *_dec_not_zero instead of *_add_unless

atomic_dec_not_zero is defined for each architecture through
<linux/atomic.h> to provide the functionality of
atomic_add_unless(x, -1, 0).

Signed-off-by: Sven Eckelmann <sven@...fation.org>
Cc: Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc: linux-mm@...ck.org
---
 mm/memcontrol.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 5f84d23..00a7580 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1909,10 +1909,10 @@ static void mem_cgroup_unmark_under_oom(struct mem_cgroup *mem)
 	/*
 	 * When a new child is created while the hierarchy is under oom,
 	 * mem_cgroup_oom_lock() may not be called. We have to use
-	 * atomic_add_unless() here.
+	 * atomic_dec_not_zero() here.
 	 */
 	for_each_mem_cgroup_tree(iter, mem)
-		atomic_add_unless(&iter->under_oom, -1, 0);
+		atomic_dec_not_zero(&iter->under_oom);
 }
 
 static DEFINE_SPINLOCK(memcg_oom_lock);
-- 
1.7.5.4

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