From 11d55d2cba6e867be8955e5ae011c54c556b849f Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Fri, 5 Sep 2008 14:00:18 -0700 Subject: [PATCH] res_counter: fix off-by-one bug in setting limit I found we can no longer set limit to 0 with 2.6.27-rcX: # mount -t cgroup -omemory xxx /mnt # mkdir /mnt/0 # echo 0 > /mnt/0/memory.limit_in_bytes bash: echo: write error: Device or resource busy It turned out 'limit' can't be set to 'usage', which is wrong IMO. Signed-off-by: Li Zefan Acked-by: KAMEZAWA Hiroyuki Acked-by: Balbir Singh Acked-by: Pavel Emelyanov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/res_counter.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h index fdeadd9740dc..271c1c2c9f6f 100644 --- a/include/linux/res_counter.h +++ b/include/linux/res_counter.h @@ -166,7 +166,7 @@ static inline int res_counter_set_limit(struct res_counter *cnt, int ret = -EBUSY; spin_lock_irqsave(&cnt->lock, flags); - if (cnt->usage < limit) { + if (cnt->usage <= limit) { cnt->limit = limit; ret = 0; } -- 2.20.1