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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 <>

Acked-by: Li Zefan <>

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