Re: [RFC][PATCH] fix move/migrate_pages() race on task struct

[Dave Hansen]

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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