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    SubjectRe: [patch 1/2] kernel: cgroup: push rcu read locking from css_is_ancestor() to callsite
    Johannes Weiner wrote:
    > Library functions should not grab locks when the callsites can do it,
    > even if the lock nests like the rcu read-side lock does.
    >
    > Push the rcu_read_lock() from css_is_ancestor() to its single user,
    > mem_cgroup_same_or_subtree() in preparation for another user that may
    > already hold the rcu read-side lock.
    >
    > Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>

    Acked-by: Li Zefan <lizf@cn.fujitsu.com>


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