[PATCH] mm: memcontrol: fix the return in mem_cgroup_margin

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From: Li RongQing <roy.qing.li@xxxxxxxxx>

when memory+swap is over limit, return 0

Signed-off-by: Li RongQing <roy.qing.li@xxxxxxxxx>
---
 mm/memcontrol.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index fe787f5..e9211c2 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1090,6 +1090,8 @@ static unsigned long mem_cgroup_margin(struct mem_cgroup *memcg)
 		limit = READ_ONCE(memcg->memsw.limit);
 		if (count <= limit)
 			margin = min(margin, limit - count);
+		else
+			margin = 0;
 	}
 
 	return margin;
-- 
2.1.4

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