1 files changed, 7 insertions, 21 deletions

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c099cc6eebe3..dd00aaf44fda 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2637,8 +2637,6 @@ static int select_idle_sibling(struct task_struct *p, int target)
         int cpu = smp_processor_id();
         int prev_cpu = task_cpu(p);
         struct sched_domain *sd;
-        struct sched_group *sg;
-        int i;
 
         /*
          * If the task is going to be woken-up on this cpu and if it is
@@ -2655,29 +2653,17 @@ static int select_idle_sibling(struct task_struct *p, int target)
                 return prev_cpu;
 
         /*
-         * Otherwise, iterate the domains and find an elegible idle cpu.
+         * Otherwise, check assigned siblings to find an elegible idle cpu.
          */
         sd = rcu_dereference(per_cpu(sd_llc, target));
-        for_each_lower_domain(sd) {
-                sg = sd->groups;
-                do {
-                        if (!cpumask_intersects(sched_group_cpus(sg),
-                                                tsk_cpus_allowed(p)))
-                                goto next;
-
-                        for_each_cpu(i, sched_group_cpus(sg)) {
-                                if (!idle_cpu(i))
-                                        goto next;
-                        }
 
-                        target = cpumask_first_and(sched_group_cpus(sg),
-                                        tsk_cpus_allowed(p));
-                        goto done;
-next:
-                        sg = sg->next;
-                } while (sg != sd->groups);
+        for_each_lower_domain(sd) {
+                if (!cpumask_test_cpu(sd->idle_buddy, tsk_cpus_allowed(p)))
+                        continue;
+                if (idle_cpu(sd->idle_buddy))
+                        return sd->idle_buddy;
         }
-done:
+
         return target;
 }