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oom: check PF_KTHREAD instead of !mm to skip kthreads
select_bad_process() thinks a kernel thread can't have ->mm != NULL, this is not true due to use_mm(). Change the code to check PF_KTHREAD. Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: David Rientjes <rientjes@google.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -256,14 +256,11 @@ static struct task_struct *select_bad_process(unsigned long *ppoints,
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for_each_process(p) {
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unsigned long points;
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/*
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* skip kernel threads and tasks which have already released
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* their mm.
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*/
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/* skip tasks that have already released their mm */
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if (!p->mm)
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continue;
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/* skip the init task */
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if (is_global_init(p))
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/* skip the init task and kthreads */
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if (is_global_init(p) || (p->flags & PF_KTHREAD))
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continue;
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if (mem && !task_in_mem_cgroup(p, mem))
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continue;
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