linux-kernel - [PATCH -next v2 1/5] block, bfq: cleanup bfq_weights

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Date:   Sat, 16 Apr 2022 17:37:49 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <jack@...e.cz>, <paolo.valente@...aro.org>, <axboe@...nel.dk>,
        <tj@...nel.org>
CC:     <linux-block@...r.kernel.org>, <cgroups@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <yukuai3@...wei.com>,
        <yi.zhang@...wei.com>
Subject: [PATCH -next v2 1/5] block, bfq: cleanup bfq_weights_tree add/remove apis

They already pass 'bfqd' as the first parameter, there is no need to
pass 'bfqd->queue_weights_tree' as another parameter.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 block/bfq-iosched.c | 14 +++++++-------
 block/bfq-iosched.h |  7 ++-----
 block/bfq-wf2q.c    | 16 +++++-----------
 3 files changed, 14 insertions(+), 23 deletions(-)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 2e0dd68a3cbe..2deea2d07a1f 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -862,9 +862,9 @@ static bool bfq_asymmetric_scenario(struct bfq_data *bfqd,
  * In most scenarios, the rate at which nodes are created/destroyed
  * should be low too.
  */
-void bfq_weights_tree_add(struct bfq_data *bfqd, struct bfq_queue *bfqq,
-			  struct rb_root_cached *root)
+void bfq_weights_tree_add(struct bfq_data *bfqd, struct bfq_queue *bfqq)
 {
+	struct rb_root_cached *root = &bfqd->queue_weights_tree;
 	struct bfq_entity *entity = &bfqq->entity;
 	struct rb_node **new = &(root->rb_root.rb_node), *parent = NULL;
 	bool leftmost = true;
@@ -936,13 +936,14 @@ void bfq_weights_tree_add(struct bfq_data *bfqd, struct bfq_queue *bfqq,
  * See the comments to the function bfq_weights_tree_add() for considerations
  * about overhead.
  */
-void __bfq_weights_tree_remove(struct bfq_data *bfqd,
-			       struct bfq_queue *bfqq,
-			       struct rb_root_cached *root)
+void __bfq_weights_tree_remove(struct bfq_data *bfqd, struct bfq_queue *bfqq)
 {
+	struct rb_root_cached *root;
+
 	if (!bfqq->weight_counter)
 		return;
 
+	root = &bfqd->queue_weights_tree;
 	bfqq->weight_counter->num_active--;
 	if (bfqq->weight_counter->num_active > 0)
 		goto reset_entity_pointer;
@@ -1004,8 +1005,7 @@ void bfq_weights_tree_remove(struct bfq_data *bfqd,
 	 * has no dispatched request. DO NOT use bfqq after the next
 	 * function invocation.
 	 */
-	__bfq_weights_tree_remove(bfqd, bfqq,
-				  &bfqd->queue_weights_tree);
+	__bfq_weights_tree_remove(bfqd, bfqq);
 }
 
 /*
diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
index 3b83e3d1c2e5..072099b0c11a 100644
--- a/block/bfq-iosched.h
+++ b/block/bfq-iosched.h
@@ -969,11 +969,8 @@ struct bfq_queue *bic_to_bfqq(struct bfq_io_cq *bic, bool is_sync);
 void bic_set_bfqq(struct bfq_io_cq *bic, struct bfq_queue *bfqq, bool is_sync);
 struct bfq_data *bic_to_bfqd(struct bfq_io_cq *bic);
 void bfq_pos_tree_add_move(struct bfq_data *bfqd, struct bfq_queue *bfqq);
-void bfq_weights_tree_add(struct bfq_data *bfqd, struct bfq_queue *bfqq,
-			  struct rb_root_cached *root);
-void __bfq_weights_tree_remove(struct bfq_data *bfqd,
-			       struct bfq_queue *bfqq,
-			       struct rb_root_cached *root);
+void bfq_weights_tree_add(struct bfq_data *bfqd, struct bfq_queue *bfqq);
+void __bfq_weights_tree_remove(struct bfq_data *bfqd, struct bfq_queue *bfqq);
 void bfq_weights_tree_remove(struct bfq_data *bfqd,
 			     struct bfq_queue *bfqq);
 void bfq_bfqq_expire(struct bfq_data *bfqd, struct bfq_queue *bfqq,
diff --git a/block/bfq-wf2q.c b/block/bfq-wf2q.c
index f8eb340381cf..a1296058c1ec 100644
--- a/block/bfq-wf2q.c
+++ b/block/bfq-wf2q.c
@@ -707,7 +707,6 @@ __bfq_entity_update_weight_prio(struct bfq_service_tree *old_st,
 		struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity);
 		unsigned int prev_weight, new_weight;
 		struct bfq_data *bfqd = NULL;
-		struct rb_root_cached *root;
 #ifdef CONFIG_BFQ_GROUP_IOSCHED
 		struct bfq_sched_data *sd;
 		struct bfq_group *bfqg;
@@ -770,19 +769,15 @@ __bfq_entity_update_weight_prio(struct bfq_service_tree *old_st,
 		 * queue, remove the entity from its old weight counter (if
 		 * there is a counter associated with the entity).
 		 */
-		if (prev_weight != new_weight && bfqq) {
-			root = &bfqd->queue_weights_tree;
-			__bfq_weights_tree_remove(bfqd, bfqq, root);
-		}
+		if (prev_weight != new_weight && bfqq)
+			__bfq_weights_tree_remove(bfqd, bfqq);
 		entity->weight = new_weight;
 		/*
 		 * Add the entity, if it is not a weight-raised queue,
 		 * to the counter associated with its new weight.
 		 */
-		if (prev_weight != new_weight && bfqq && bfqq->wr_coeff == 1) {
-			/* If we get here, root has been initialized. */
-			bfq_weights_tree_add(bfqd, bfqq, root);
-		}
+		if (prev_weight != new_weight && bfqq && bfqq->wr_coeff == 1)
+			bfq_weights_tree_add(bfqd, bfqq);
 
 		new_st->wsum += entity->weight;
 
@@ -1686,8 +1681,7 @@ void bfq_add_bfqq_busy(struct bfq_data *bfqd, struct bfq_queue *bfqq)
 
 	if (!bfqq->dispatched)
 		if (bfqq->wr_coeff == 1)
-			bfq_weights_tree_add(bfqd, bfqq,
-					     &bfqd->queue_weights_tree);
+			bfq_weights_tree_add(bfqd, bfqq);
 
 	if (bfqq->wr_coeff > 1)
 		bfqd->wr_busy_queues++;
-- 
2.31.1