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    SubjectRe: [RFC][PATCH 1/3] CGroups: Add a per-subsystem hierarchy_mutex
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    On Wed, Dec 10, 2008 at 7:05 PM, Li Zefan <lizf@cn.fujitsu.com> wrote:
    >
    > But this function is used in cgroup.c internally, and always called
    > with cgroup_lock held, so it's OK to use for_each_subsys().

    This is true, but it doesn't hurt to be future-proof and not require
    cgroup_mutex to be held.

    Paul


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