oom: do not take callback_mutex
Since no task descriptor's 'cpuset' field is dereferenced in the execution of the OOM killer anymore, it is no longer necessary to take callback_mutex. [akpm@linux-foundation.org: restore cpuset_lock for other patches] Cc: Andrea Arcangeli <andrea@suse.de> Acked-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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