Call sched_state_task_picked() from pick_next_task_stop()

Otherwise, the scheduler state machine becomes confused (and goes into
a rescheduling loop) when stop-machine is triggered.

1 files changed, 8 insertions, 0 deletions

diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c
index da5eb5bed84a..6835d31dd45b 100644
--- a/kernel/sched/stop_task.c
+++ b/kernel/sched/stop_task.c
@@ -1,5 +1,7 @@
 #include "sched.h"
 
+#include <litmus/preempt.h>
+
 /*
  * stop-task scheduling class.
  *
@@ -29,6 +31,12 @@ static struct task_struct *pick_next_task_stop(struct rq *rq)
 
         if (stop && stop->on_rq) {
                 stop->se.exec_start = rq->clock_task;
+                /* Let the LITMUS^RT scheduler state machine know
+                 * that a task was picked. This is needed because the
+                 * LITMUS^RT scheduling plugin will not be called
+                 * if the stop-task class picks a task.
+                 */
+                sched_state_task_picked();
                 return stop;
         }