From: zhang jun <jun.zhang@xxxxxxxxx>
find_idlest_cpu return -1 is not reasonable, set default value to this_cpu.
Signed-off-by: zhang jun <jun.zhang@xxxxxxxxx>
Signed-off-by: Chuansheng Liu <chuansheng.liu@xxxxxxxxx>
Signed-off-by: Changcheng Liu <changcheng.liu@xxxxxxxxx>
Cc: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
Cc: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 3.14.25
---
kernel/sched/fair.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9b4c4f3..9d18887 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4151,7 +4151,7 @@ static int
find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu)
{
unsigned long load, min_load = ULONG_MAX;
- int idlest = -1;
+ int idlest = this_cpu;
int i;
/* Traverse only the allowed CPUs */
@@ -4284,7 +4284,7 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f
}
new_cpu = find_idlest_cpu(group, p, cpu);
- if (new_cpu == -1 || new_cpu == cpu) {
+ if (new_cpu == cpu) {
/* Now try balancing at a lower domain level of cpu */
sd = sd->child;
continue;
--
1.7.9.5
--
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