[PATCHv4 09/11] memcg: Use *_dec_not_zero instead of *_add_unless

[Sven Eckelmann]

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@xxxxxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Cc: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
---
 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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