Messages in this thread | | | Date | Fri, 4 Nov 2011 17:38:34 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [PATCH 01/10] cgroup: add cgroup_root_mutex |
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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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