linux-kernel - [PATCH 1/4] block, bfq: remove BFQ_WEIGHT_LEGACY

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Message-Id: <20230328145701.33699-1-zhouchengming@bytedance.com>
Date:   Tue, 28 Mar 2023 22:56:58 +0800
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     paolo.valente@...aro.org, axboe@...nel.dk, tj@...nel.org,
        josef@...icpanda.com
Cc:     linux-block@...r.kernel.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Chengming Zhou <zhouchengming@...edance.com>
Subject: [PATCH 1/4] block, bfq: remove BFQ_WEIGHT_LEGACY_DFL

BFQ_WEIGHT_LEGACY_DFL is the same as CGROUP_WEIGHT_DFL, which means
we don't need cpd_bind_fn() callback to update default weight when
attached to a hierarchy.

This patch remove BFQ_WEIGHT_LEGACY_DFL and cpd_bind_fn().

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 block/bfq-cgroup.c  | 4 +---
 block/bfq-iosched.h | 1 -
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index 89ffb3aa992c..a2ab5dd58068 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c
@@ -504,8 +504,7 @@ static void bfq_cpd_init(struct blkcg_policy_data *cpd)
 {
 	struct bfq_group_data *d = cpd_to_bfqgd(cpd);
 
-	d->weight = cgroup_subsys_on_dfl(io_cgrp_subsys) ?
-		CGROUP_WEIGHT_DFL : BFQ_WEIGHT_LEGACY_DFL;
+	d->weight = CGROUP_WEIGHT_DFL;
 }
 
 static void bfq_cpd_free(struct blkcg_policy_data *cpd)
@@ -1302,7 +1301,6 @@ struct blkcg_policy blkcg_policy_bfq = {
 
 	.cpd_alloc_fn		= bfq_cpd_alloc,
 	.cpd_init_fn		= bfq_cpd_init,
-	.cpd_bind_fn	        = bfq_cpd_init,
 	.cpd_free_fn		= bfq_cpd_free,
 
 	.pd_alloc_fn		= bfq_pd_alloc,
diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
index 69aaee52285a..467e8cfc41a2 100644
--- a/block/bfq-iosched.h
+++ b/block/bfq-iosched.h
@@ -20,7 +20,6 @@
 
 #define BFQ_DEFAULT_QUEUE_IOPRIO	4
 
-#define BFQ_WEIGHT_LEGACY_DFL	100
 #define BFQ_DEFAULT_GRP_IOPRIO	0
 #define BFQ_DEFAULT_GRP_CLASS	IOPRIO_CLASS_BE
 
-- 
2.39.2