1 files changed, 15 insertions, 1 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 50a5352f6205..d59652d60f86 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3417,6 +3417,20 @@ static bool check_same_owner(struct task_struct *p)
         return match;
 }
 
+static bool dl_param_changed(struct task_struct *p,
+                const struct sched_attr *attr)
+{
+        struct sched_dl_entity *dl_se = &p->dl;
+
+        if (dl_se->dl_runtime != attr->sched_runtime ||
+                dl_se->dl_deadline != attr->sched_deadline ||
+                dl_se->dl_period != attr->sched_period ||
+                dl_se->flags != attr->sched_flags)
+                return true;
+
+        return false;
+}
+
 static int __sched_setscheduler(struct task_struct *p,
                                 const struct sched_attr *attr,
                                 bool user)
@@ -3545,7 +3559,7 @@ recheck:
                         goto change;
                 if (rt_policy(policy) && attr->sched_priority != p->rt_priority)
                         goto change;
-                if (dl_policy(policy))
+                if (dl_policy(policy) && dl_param_changed(p, attr))
                         goto change;
 
                 p->sched_reset_on_fork = reset_on_fork;