memcg: fix refcnt handling at swapoff
authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Thu, 29 Jan 2009 22:25:13 +0000 (14:25 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 30 Jan 2009 02:04:43 +0000 (18:04 -0800)
commit85d9fc89fb0f0703df6444f260187c088a8d59ff
treeba034e2b8bff6b7f3b62a826a0106dc0e1391b46
parent7460db567bbca76bf087d1694d792a1a96bdaa26
memcg: fix refcnt handling at swapoff

Now, at swapoff, even while try_charge() fails, commit is executed.  This
is a bug which turns the refcnt of cgroup_subsys_state negative.

Reported-by: Li Zefan <lizf@cn.fujitsu.com>
Tested-by: Li Zefan <lizf@cn.fujitsu.com>
Tested-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/swapfile.c