1 files changed, 17 insertions, 3 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index f592ce6f8616..48013633d792 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2309,7 +2309,7 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state)
  * Cause a process which is running on another CPU to enter
  * kernel-mode, without any delay. (to get signals handled.)
  *
- * NOTE: this function doesnt have to take the runqueue lock,
+ * NOTE: this function doesn't have to take the runqueue lock,
  * because all it wants to ensure is that the remote task enters
  * the kernel. If the IPI races and the task has been migrated
  * to another CPU then no harm is done and the purpose has been
@@ -4997,7 +4997,7 @@ recheck:
          */
         raw_spin_lock_irqsave(&p->pi_lock, flags);
         /*
-         * To be able to change p->policy safely, the apropriate
+         * To be able to change p->policy safely, the appropriate
          * runqueue lock must be held.
          */
         rq = __task_rq_lock(p);
@@ -5011,6 +5011,17 @@ recheck:
                 return -EINVAL;
         }
 
+        /*
+         * If not changing anything there's no need to proceed further:
+         */
+        if (unlikely(policy == p->policy && (!rt_policy(policy) ||
+                        param->sched_priority == p->rt_priority))) {
+
+                __task_rq_unlock(rq);
+                raw_spin_unlock_irqrestore(&p->pi_lock, flags);
+                return 0;
+        }
+
 #ifdef CONFIG_RT_GROUP_SCHED
         if (user) {
                 /*
@@ -5705,7 +5716,7 @@ void show_state_filter(unsigned long state_filter)
         do_each_thread(g, p) {
                 /*
                  * reset the NMI-timeout, listing all files on a slow
-                 * console might take alot of time:
+                 * console might take a lot of time:
                  */
                 touch_nmi_watchdog();
                 if (!state_filter || (p->state & state_filter))
@@ -6320,6 +6331,9 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 break;
 #endif
         }
+
+        update_max_interval();
+
         return NOTIFY_OK;
 }