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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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@ -463,7 +463,6 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order)
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* NUMA) that may require different handling.
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*/
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constraint = constrained_alloc(zonelist, gfp_mask);
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cpuset_lock();
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read_lock(&tasklist_lock);
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switch (constraint) {
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@ -495,7 +494,6 @@ retry:
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/* Found nothing?!?! Either we hang forever, or we panic. */
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if (!p) {
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read_unlock(&tasklist_lock);
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cpuset_unlock();
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panic("Out of memory and no killable processes...\n");
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}
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@ -508,7 +506,6 @@ retry:
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out:
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read_unlock(&tasklist_lock);
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cpuset_unlock();
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/*
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* Give "p" a good chance of killing itself before we
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