linux-kernel - Re: [BUGFIX][PATCH] memcg rcu lock fix in swap code (Was Re: [BUG] an RCU warning in memcg

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Date:	Fri, 23 Apr 2010 11:49:54 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [BUGFIX][PATCH] memcg rcu lock fix in swap code (Was Re: [BUG]
 an RCU warning in memcg

KAMEZAWA Hiroyuki wrote:
> On Fri, 23 Apr 2010 11:00:41 +0800
> Li Zefan <lizf@...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@...fujitsu.com>
> 
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