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    SubjectRe: [RFC][PATCH] fix move/migrate_pages() race on task struct
    On 02/24/2012 09:08 AM, Christoph Lameter wrote:
    > cpuset_mems_allowed takes a mutex. Hmmm... Under rcu?
    > security_task_movememory does some kind of security hook.
    > Is that all safe? If not then we need to take a refcount on the task
    > struct after all.

    Urg, no we can't sleep under an rcu_read_lock().

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