There is a suspicious RCU warning at startup which is harmless but this
locking removes it.

-ck
---
 kernel/sched/bfs.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux-3.7-bfs/kernel/sched/bfs.c
===================================================================
--- linux-3.7-bfs.orig/kernel/sched/bfs.c	2013-01-29 01:21:39.948486112 +1100
+++ linux-3.7-bfs/kernel/sched/bfs.c	2013-01-29 01:22:35.994785437 +1100
@@ -7168,6 +7168,8 @@ void __init sched_init_smp(void)
 	 */
 	for_each_online_cpu(cpu) {
 		struct rq *rq = cpu_rq(cpu);
+
+		mutex_lock(&sched_domains_mutex);
 		for_each_domain(cpu, sd) {
 			int locality, other_cpu;
 
@@ -7197,8 +7199,9 @@ void __init sched_init_smp(void)
 					rq->cpu_locality[other_cpu] = locality;
 			}
 		}
+		mutex_unlock(&sched_domains_mutex);
 
-/*
+		/*
 		 * Each runqueue has its own function in case it doesn't have
 		 * siblings of its own allowing mixed topologies.
 		 */