Do not wake up idle or offline runqueues unnecessarily in check_smt_siblings.

-ck

---
 kernel/sched/bfs.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux-3.15.5-ck1/kernel/sched/bfs.c
===================================================================
--- linux-3.15.5-ck1.orig/kernel/sched/bfs.c	2014-08-11 10:22:35.394423127 +1000
+++ linux-3.15.5-ck1/kernel/sched/bfs.c	2014-08-12 11:26:36.480936005 +1000
@@ -3297,6 +3297,10 @@ static void check_smt_siblings(int cpu)
 		if (other_cpu == cpu)
 			continue;
 		rq = cpu_rq(other_cpu);
+		if (rq_idle(rq))
+			continue;
+		if (!rq->online)
+			continue;
 		p = rq->curr;
 		if (smt_should_schedule(p, cpu)) {
 			set_tsk_need_resched(p);