[PATCH] cpuset: oom panic fix

cpuset_excl_nodes_overlap always returns 0 if current is exiting. This caused
customer's systems to panic in the OOM killer when processes were having
trouble getting memory for the final put_user in mm_release. Even though
there were lots of processes to kill.

Change to returning 1 in this case. This achieves parity with !CONFIG_CPUSETS
case, and was observed to fix the problem.

Signed-off-by: Nick Piggin <[e-mail]>
Acked-by: Paul Jackson <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

kernel/cpuset.c

···
 int cpuset_excl_nodes_overlap(const struct task_struct *p)
 {
 	const struct cpuset *cs1, *cs2;	/* my and p's cpuset ancestors */
-	int overlap = 0;		/* do cpusets overlap? */
+	int overlap = 1;		/* do cpusets overlap? */
 
 	task_lock(current);
 	if (current->flags & PF_EXITING) {