[patch] BFS 421: fix resched_closest_idle

[Hillf Danton]

Frankly it is not fix, but operating cpu_idle_map is not sane if idle_cpus is
not checked first, according to its define.

Btw, the helper will be removed soon as we no longer maintain the sticky bit.


--- a/kernel/sched/bfs.c	Wed Jun  6 20:04:50 2012
+++ b/kernel/sched/bfs.c	Wed Jun  6 20:06:38 2012
@@ -1055,6 +1055,8 @@ resched_closest_idle(struct rq *rq, int
 {
 	cpumask_t tmpmask;

+	if (!grq.idle_cpus)
+		return;
 	cpus_and(tmpmask, p->cpus_allowed, grq.cpu_idle_map);
 	cpu_clear(cpu, tmpmask);
 	if (cpus_empty(tmpmask))
--
--
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