1 files changed, 7 insertions, 14 deletions

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 8dbee9f4ceb2..ed18c74db017 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3252,25 +3252,18 @@ find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu)
  */
 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;
+        int i = task_cpu(p);
 
-        /*
-         * If the task is going to be woken-up on this cpu and if it is
-         * already idle, then it is the right target.
-         */
-        if (target == cpu && idle_cpu(cpu))
-                return cpu;
+        if (idle_cpu(target))
+                return target;
 
         /*
-         * If the task is going to be woken-up on the cpu where it previously
-         * ran and if it is currently idle, then it the right target.
+         * If the prevous cpu is cache affine and idle, don't be stupid.
          */
-        if (target == prev_cpu && idle_cpu(prev_cpu))
-                return prev_cpu;
+        if (i != target && cpus_share_cache(i, target) && idle_cpu(i))
+                return i;
 
         /*
          * Otherwise, iterate the domains and find an elegible idle cpu.
@@ -3284,7 +3277,7 @@ static int select_idle_sibling(struct task_struct *p, int target)
                                 goto next;
 
                         for_each_cpu(i, sched_group_cpus(sg)) {
-                                if (!idle_cpu(i))
+                                if (i == target || !idle_cpu(i))
                                         goto next;
                         }