linux-kernel - Re: [PATCH] blk-cgroup: Call cgroup

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Message-ID: <CA+1xoqdz+m7kK+XgsmwM2Bt07eLH294L_PT6DrUkhJvRzpUZCg@mail.gmail.com>
Date:	Mon, 12 Mar 2012 20:06:53 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH] blk-cgroup: Call cgroup_path only under cgroup lock

On Mon, Mar 12, 2012 at 8:04 PM, Tejun Heo <tj@...nel.org> wrote:
> Hello, Sasha.
>
> On Mon, Mar 12, 2012 at 04:01:18PM -0400, Sasha Levin wrote:
>> Since we can't keep rcu read lock during blkg_alloc(), we currently
>> call cgroup_path() without any locks at all.
>>
>> This patch adds cgroup locking before calling cgroup_path.
>>
>> This also fixes a lockdep warning on boot.
>>
>> Signed-off-by: Sasha Levin <levinsasha928@...il.com>
>
> Which branch is this against?  There's already pending stat update
> patch from Vivek which fix this problem along with the percpu
> allocation problem.
>
> Thanks.

I've fixed it for linux-next.
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