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

From: Tejun Heo
Date: Wed Jun 04 2014 - 21:22:36 EST

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@xxxxxxxxxx>

Applied to cgroup/for-3.16.


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