linux-kernel - Re: [PATCH v2] cgroup: don't destroy the default root

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Message-ID: <20140605012227.GC14370@mtj.dyndns.org>
Date:	Wed, 4 Jun 2014 21:22:27 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH v2] cgroup: don't destroy the default root

On Wed, Jun 04, 2014 at 04:48:15PM +0800, Li Zefan wrote:
> The default root is allocated and initialized at boot phase, so we
> shouldn't destroy the default root when it's umounted, otherwise
> it will lead to disaster.
> 
> Just try mount and then umount the default root, and the kernel will
> crash immediately.
> 
> v2:
> - No need to check for CSS_NO_REF in cgroup_get/put(). (Tejun)
> - Better call cgroup_put() for the default root in kill_sb(). (Tejun)
> - Add a comment.
> 
> Signed-off-by: Li Zefan <lizefan@...wei.com>

Applied to cgroup/for-3.16.

Thanks.

-- 
tejun
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