blk-throttle: clean up codes that can't be reached

While doing code coverage testing while CONFIG_BLK_DEV_THROTTLING_LOW is
disabled, we found that there are many codes can never be reached.

This patch move such codes inside "#ifdef CONFIG_BLK_DEV_THROTTLING_LOW".

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220903062826.1099085-1-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 9f5fe62..667b295 100644 (file)
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1673,6 +1673,40 @@ struct blkcg_policy blkcg_policy_throtl = {
        .pd_free_fn             = throtl_pd_free,
 };
 
+void blk_throtl_cancel_bios(struct request_queue *q)
+{
+       struct cgroup_subsys_state *pos_css;
+       struct blkcg_gq *blkg;
+
+       spin_lock_irq(&q->queue_lock);
+       /*
+        * queue_lock is held, rcu lock is not needed here technically.
+        * However, rcu lock is still held to emphasize that following
+        * path need RCU protection and to prevent warning from lockdep.
+        */
+       rcu_read_lock();
+       blkg_for_each_descendant_post(blkg, pos_css, q->root_blkg) {
+               struct throtl_grp *tg = blkg_to_tg(blkg);
+               struct throtl_service_queue *sq = &tg->service_queue;
+
+               /*
+                * Set the flag to make sure throtl_pending_timer_fn() won't
+                * stop until all throttled bios are dispatched.
+                */
+               blkg_to_tg(blkg)->flags |= THROTL_TG_CANCELING;
+               /*
+                * Update disptime after setting the above flag to make sure
+                * throtl_select_dispatch() won't exit without dispatching.
+                */
+               tg_update_disptime(tg);
+
+               throtl_schedule_pending_timer(sq, jiffies + 1);
+       }
+       rcu_read_unlock();
+       spin_unlock_irq(&q->queue_lock);
+}
+
+#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
 static unsigned long __tg_last_low_overflow_time(struct throtl_grp *tg)
 {
        unsigned long rtime = jiffies, wtime = jiffies;
@@ -1777,39 +1811,6 @@ static bool throtl_hierarchy_can_upgrade(struct throtl_grp *tg)
        return false;
 }
 
-void blk_throtl_cancel_bios(struct request_queue *q)
-{
-       struct cgroup_subsys_state *pos_css;
-       struct blkcg_gq *blkg;
-
-       spin_lock_irq(&q->queue_lock);
-       /*
-        * queue_lock is held, rcu lock is not needed here technically.
-        * However, rcu lock is still held to emphasize that following
-        * path need RCU protection and to prevent warning from lockdep.
-        */
-       rcu_read_lock();
-       blkg_for_each_descendant_post(blkg, pos_css, q->root_blkg) {
-               struct throtl_grp *tg = blkg_to_tg(blkg);
-               struct throtl_service_queue *sq = &tg->service_queue;
-
-               /*
-                * Set the flag to make sure throtl_pending_timer_fn() won't
-                * stop until all throttled bios are dispatched.
-                */
-               blkg_to_tg(blkg)->flags |= THROTL_TG_CANCELING;
-               /*
-                * Update disptime after setting the above flag to make sure
-                * throtl_select_dispatch() won't exit without dispatching.
-                */
-               tg_update_disptime(tg);
-
-               throtl_schedule_pending_timer(sq, jiffies + 1);
-       }
-       rcu_read_unlock();
-       spin_unlock_irq(&q->queue_lock);
-}
-
 static bool throtl_can_upgrade(struct throtl_data *td,
        struct throtl_grp *this_tg)
 {
@@ -2005,7 +2006,6 @@ static void blk_throtl_update_idletime(struct throtl_grp *tg)
        tg->checked_last_finish_time = last_finish_time;
 }
 
-#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
 static void throtl_update_latency_buckets(struct throtl_data *td)
 {
        struct avg_latency_bucket avg_latency[2][LATENCY_BUCKET_SIZE];
@@ -2086,6 +2086,28 @@ static void throtl_update_latency_buckets(struct throtl_data *td)
 static inline void throtl_update_latency_buckets(struct throtl_data *td)
 {
 }
+
+static void blk_throtl_update_idletime(struct throtl_grp *tg)
+{
+}
+
+static void throtl_downgrade_check(struct throtl_grp *tg)
+{
+}
+
+static void throtl_upgrade_check(struct throtl_grp *tg)
+{
+}
+
+static bool throtl_can_upgrade(struct throtl_data *td,
+       struct throtl_grp *this_tg)
+{
+       return false;
+}
+
+static void throtl_upgrade_state(struct throtl_data *td)
+{
+}
 #endif
 
 bool __blk_throtl_bio(struct bio *bio)