LITMUS: disable Linux scheduler optimization

This caused LITMUS^RT real-time tasks to be missed, which
in turn caused all kinds of inconsistent state.

1 files changed, 3 insertions, 1 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index d9e876fea8..a6dbac6282 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3602,11 +3602,13 @@ pick_next_task(struct rq *rq, struct task_struct *prev)
          * Optimization: we know that if all tasks are in
          * the fair class we can call that function directly:
          */
-        if (likely(rq->nr_running == rq->cfs.nr_running)) {
+        /* Don't do that for LITMUS.
+          if (likely(rq->nr_running == rq->cfs.nr_running)) {
                 p = fair_sched_class.pick_next_task(rq);
                 if (likely(p))
                         return p;
         }
+        */
 
         class = sched_class_highest;
         for ( ; ; ) {