On Tue, 1 Nov 2011 16:46:24 -0700 Tejun Heo <tj@xxxxxxxxxx> 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@xxxxxxxxxx> > Cc: Oleg Nesterov <oleg@xxxxxxxxxx> Thanks, Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/linux-pm
