Protect LITMUS^RT tasks from re-nicing

Assigning a nice value to LITMUS^RT tasks is meaningless. Bail out
early.

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 89a966ee63fc..ef0c6b22045c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3832,7 +3832,7 @@ void set_user_nice(struct task_struct *p, long nice)
          * it wont have any effect on scheduling until the task is
          * SCHED_DEADLINE, SCHED_FIFO or SCHED_RR:
          */
-        if (task_has_dl_policy(p) || task_has_rt_policy(p)) {
+        if (task_has_dl_policy(p) || task_has_rt_policy(p) || is_realtime(p)) {
                 p->static_prio = NICE_TO_PRIO(nice);
                 goto out_unlock;
         }