> This will allow us to call destroy() without holding the
> cgroup_mutex(). Other important updates inside update_flags()
> are protected by the callback_mutex.
>
> We could protect this variable with the callback_mutex as well,
> as suggested by Li Zefan, but we need to make sure we are protected
> by that mutex at all times, and some of its updates happen inside the
> cgroup_mutex - which means we would deadlock.
>
> An atomic variable is not expensive, since it is seldom updated,
> and protect us well.
>
> Signed-off-by: Glauber Costa <glommer@parallels.com>
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