Revert "sched/rt: Try to restart rt period timer when rt runtime exceeded"

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I531X9
CVE: NA

---------------------------

This reverts commit 4bc4fc93.
Revert this commit and apply patch in 5.10.94 LTS.
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

kernel/sched/rt.c

@@ -944,18 +944,6 @@ static inline int rt_se_prio(struct sched_rt_entity *rt_se)
 	return rt_task_of(rt_se)->prio;
 }
 
-static inline void try_start_rt_bandwidth(struct rt_bandwidth *rt_b)
-{
-	raw_spin_lock(&rt_b->rt_runtime_lock);
-	if (!rt_b->rt_period_active) {
-		rt_b->rt_period_active = 1;
-		hrtimer_forward_now(&rt_b->rt_period_timer, rt_b->rt_period);
-		hrtimer_start_expires(&rt_b->rt_period_timer,
-				      HRTIMER_MODE_ABS_PINNED_HARD);
-	}
-	raw_spin_unlock(&rt_b->rt_runtime_lock);
-}
-
 static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
 {
 	u64 runtime = sched_rt_runtime(rt_rq);
@@ -1032,17 +1020,13 @@ static void update_curr_rt(struct rq *rq)
 
 	for_each_sched_rt_entity(rt_se) {
 		struct rt_rq *rt_rq = rt_rq_of_se(rt_se);
-		int exceeded;
 
 		if (sched_rt_runtime(rt_rq) != RUNTIME_INF) {
 			raw_spin_lock(&rt_rq->rt_runtime_lock);
 			rt_rq->rt_time += delta_exec;
-			exceeded = sched_rt_runtime_exceeded(rt_rq);
-			if (exceeded)
+			if (sched_rt_runtime_exceeded(rt_rq))
 				resched_curr(rq);
 			raw_spin_unlock(&rt_rq->rt_runtime_lock);
-			if (exceeded)
-				try_start_rt_bandwidth(sched_rt_bandwidth(rt_rq));
 		}
 	}
 }
@@ -2737,10 +2721,8 @@ static int sched_rt_global_validate(void)
 
 static void sched_rt_do_global(void)
 {
-	raw_spin_lock(&def_rt_bandwidth.rt_runtime_lock);
 	def_rt_bandwidth.rt_runtime = global_rt_runtime();
 	def_rt_bandwidth.rt_period = ns_to_ktime(global_rt_period());
-	raw_spin_unlock(&def_rt_bandwidth.rt_runtime_lock);
 }
 
 int sched_rt_handler(struct ctl_table *table, int write, void *buffer,