linux-kernel - Re: [PATCH 5/5] blk-cgroup: Fix an RCU warning in blkiocg

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Message-ID: <20100507065741.GW27497@kernel.dk>
Date:	Fri, 7 May 2010 08:57:41 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	paulmck@...ux.vnet.ibm.com,
	"containers@...ts.osdl.org" <containers@...ts.osdl.org>,
	Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Gui Jianfeng <GuiJianfeng@...fujitsu.com>
Subject: Re: [PATCH 5/5] blk-cgroup: Fix an RCU warning in blkiocg_create()

On Fri, May 07 2010, Li Zefan wrote:
> Paul E. McKenney wrote:
> > On Thu, Apr 22, 2010 at 05:32:28PM +0800, Li Zefan wrote:
> >> with CONFIG_PROVE_RCU=y, a warning can be triggered:
> >>
> >>   # mount -t cgroup -o blkio xxx /mnt
> >>   # mkdir /mnt/subgroup
> >>
> >> ...
> >> kernel/cgroup.c:4442 invoked rcu_dereference_check() without protection!
> >> ...
> >>
> >> To fix this, we avoid caling css_depth() here, which is a bit simpler
> >> than the original code.
> > 
> > Queued for 2.6.34, thank you!
> > 
> 
> Seems neither you nor Jens queued this patch...

I've included it now, thanks.

-- 
Jens Axboe

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