sched/fair: Add qos_throttle_list node in struct cfs_rq

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I50PPU
CVE: NA

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when unthrottle a cfs_rq at distribute_cfs_runtime(), another cpu
may re-throttle this cfs_rq at qos_throttle_cfs_rq() before access
the cfs_rq->throttle_list.next, but meanwhile, qos throttle will
attach the cfs_rq throttle_list node to percpu qos_throttled_cfs_rq,
it will change cfs_rq->throttle_list.next and cause panic or hardlockup
at distribute_cfs_runtime().

Fix it by adding a qos_throttle_list node in struct cfs_rq, and qos
throttle disuse the cfs_rq->throttle_list.
Signed-off-by: NZhang Qiao <zhangqiao22@huawei.com>
Reviewed-by: Nzheng zucheng <zhengzucheng@huawei.com>
Reviewed-by: NChen Hui <judy.chenhui@huawei.com>
Reviewed-by: NWang Weiyang <wangweiyang2@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

kernel/sched/fair.c

@@ -5385,6 +5385,9 @@ static void init_cfs_rq_runtime(struct cfs_rq *cfs_rq)
 {
 	cfs_rq->runtime_enabled = 0;
 	INIT_LIST_HEAD(&cfs_rq->throttled_list);
+#ifdef CONFIG_QOS_SCHED
+	INIT_LIST_HEAD(&cfs_rq->qos_throttled_list);
+#endif
 }
 
 void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
@@ -7204,7 +7207,8 @@ static void throttle_qos_cfs_rq(struct cfs_rq *cfs_rq)
 	cfs_rq->throttled = 1;
 	cfs_rq->throttled_clock = rq_clock(rq);
 
-	list_add(&cfs_rq->throttled_list, &per_cpu(qos_throttled_cfs_rq, cpu_of(rq)));
+	list_add(&cfs_rq->qos_throttled_list,
+		 &per_cpu(qos_throttled_cfs_rq, cpu_of(rq)));
 }
 
 static void unthrottle_qos_cfs_rq(struct cfs_rq *cfs_rq)
@@ -7223,7 +7227,7 @@ static void unthrottle_qos_cfs_rq(struct cfs_rq *cfs_rq)
 	update_rq_clock(rq);
 
 	cfs_b->throttled_time += rq_clock(rq) - cfs_rq->throttled_clock;
-	list_del_init(&cfs_rq->throttled_list);
+	list_del_init(&cfs_rq->qos_throttled_list);
 
 	/* update hierarchical throttle state */
 	walk_tg_tree_from(cfs_rq->tg, tg_nop, tg_unthrottle_up, (void *)rq);
@@ -7266,7 +7270,7 @@ static int __unthrottle_qos_cfs_rqs(int cpu)
 	int res = 0;
 
 	list_for_each_entry_safe(cfs_rq, tmp_rq, &per_cpu(qos_throttled_cfs_rq, cpu),
-				throttled_list) {
+				 qos_throttled_list) {
 		if (cfs_rq_throttled(cfs_rq)) {
 			unthrottle_qos_cfs_rq(cfs_rq);
 			res++;

kernel/sched/sched.h

@@ -626,8 +626,12 @@ struct cfs_rq {
 #endif /* CONFIG_CFS_BANDWIDTH */
 #endif /* CONFIG_FAIR_GROUP_SCHED */
 
+#if !defined(__GENKSYMS__) && defined(CONFIG_QOS_SCHED)
+	struct list_head	qos_throttled_list;
+#else
 	KABI_RESERVE(1)
 	KABI_RESERVE(2)
+#endif
 	KABI_RESERVE(3)
 	KABI_RESERVE(4)
 };