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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