1 files changed, 9 insertions, 0 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 6edbef296ece..f5c6635b806c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3338,6 +3338,15 @@ recheck:
                                 return -EPERM;
                 }
 
+                 /*
+                  * Can't set/change SCHED_DEADLINE policy at all for now
+                  * (safest behavior); in the future we would like to allow
+                  * unprivileged DL tasks to increase their relative deadline
+                  * or reduce their runtime (both ways reducing utilization)
+                  */
+                if (dl_policy(policy))
+                        return -EPERM;
+
                 /*
                  * Treat SCHED_IDLE as nice 20. Only allow a switch to
                  * SCHED_NORMAL if the RLIMIT_NICE would normally permit it.