[PATCH 21/40] autonuma: avoid CFS select_task_rq_fair to return -1

[Andrea Arcangeli]

Fix to avoid -1 retval.

Includes fixes from Hillf Danton <dhillf@xxxxxxxxx>.

Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
---
 kernel/sched/fair.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c099cc6..fa96810 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2789,6 +2789,9 @@ select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flags)
 		if (new_cpu == -1 || new_cpu == cpu) {
 			/* Now try balancing at a lower domain level of cpu */
 			sd = sd->child;
+			if (new_cpu < 0)
+				/* Return prev_cpu is find_idlest_cpu failed */
+				new_cpu = prev_cpu;
 			continue;
 		}
 
@@ -2807,6 +2810,7 @@ select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flags)
 unlock:
 	rcu_read_unlock();
 
+	BUG_ON(new_cpu < 0);
 	return new_cpu;
 }
 #endif /* CONFIG_SMP */
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