LITMUS: rework job migration code

The old version had a significant window for races with
interrupt handlers executing on other CPUs.

1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 00097dea89..170237e3a4 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3649,9 +3649,10 @@ need_resched_nonpreemptible:
         /* do litmus scheduling outside of rq lock, so that we
          * can do proper migrations for global schedulers
          */
-        litmus_schedule(rq, prev);
+       
         spin_lock(&rq->lock);
         clear_tsk_need_resched(prev);
+        litmus_schedule(rq, prev);
 
         if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
                 if (unlikely((prev->state & TASK_INTERRUPTIBLE) &&