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SubjectRe: [PATCH 01/10] cgroup: add cgroup_root_mutex
On Tue,  1 Nov 2011 16:46:24 -0700
Tejun Heo <tj@kernel.org> wrote:

> cgroup wants to make threadgroup stable while modifying cgroup
> hierarchies which will introduce locking dependency on
> cred_guard_mutex from cgroup_mutex. This unfortunately completes
> circular dependency.
>
> A. cgroup_mutex -> cred_guard_mutex -> s_type->i_mutex_key -> namespace_sem
> B. namespace_sem -> cgroup_mutex
>
> B is from cgroup_show_options() and this patch breaks it by
> introducing another mutex cgroup_root_mutex which nests inside
> cgroup_mutex and protects cgroupfs_root.
>
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Cc: Oleg Nesterov <oleg@redhat.com>

Thanks,
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>



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