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Date: Fri, 23 Apr 2010 11:49:54 +0800
From: Li Zefan <lizf@cn.fujitsu.com>
MIME-Version: 1.0
Subject: Re: [BUGFIX][PATCH] memcg rcu lock fix in swap code (Was Re: [BUG]
 an RCU warning in memcg
References: <4BD10D59.9090504@cn.fujitsu.com> <20100423121424.ae47efcb.kamezawa.hiroyu@jp.fujitsu.com>
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To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>, Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>, "akpm@linux-foundation.org" <akpm@linux-foundation.org>
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KAMEZAWA Hiroyuki wrote:
> On Fri, 23 Apr 2010 11:00:41 +0800
> Li Zefan <lizf@cn.fujitsu.com> wrote:
> 
>> with CONFIG_PROVE_RCU=y, I saw this warning, it's because
>> css_id() is not under rcu_read_lock().
>>
> 
> Ok. Thank you for reporting.
> This is ok ? 

Yes, and I did some more simple tests on memcg, no more warning
showed up.

> ==
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> 

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