[PATCH] active_load_balance() deadlock

active_load_balance() looks susceptible to deadlock when busiest==rq.
Without the following patch, my 128-way box deadlocks consistently
during boot-time driver init.

1 files changed, 2 insertions, 0 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index e4966cb2a41c11..af767b38ca0609 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1844,6 +1844,8 @@ static void active_load_balance(runqueue_t *busiest, int busiest_cpu)
  		}
 
 		rq = cpu_rq(push_cpu);
+		if (busiest == rq)
+			goto next_group;
 		double_lock_balance(busiest, rq);
 		move_tasks(rq, push_cpu, busiest, 1, sd, IDLE);
 		spin_unlock(&rq->lock);