blk-cgroup: delete cpd_init_fn of blkcg_policy

blkcg_policy cpd_init_fn() is used to just initialize some default
fields of policy data, which is enough to do in cpd_alloc_fn().

This patch delete the only user bfq_cpd_init(), and remove cpd_init_fn
from blkcg_policy.

Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20230406145050.49914-4-zhouchengming@bytedance.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index a2ab5dd..74f7d05 100644 (file)
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c
@@ -497,14 +497,9 @@ static struct blkcg_policy_data *bfq_cpd_alloc(gfp_t gfp)
        bgd = kzalloc(sizeof(*bgd), gfp);
        if (!bgd)
                return NULL;
-       return &bgd->pd;
-}
 
-static void bfq_cpd_init(struct blkcg_policy_data *cpd)
-{
-       struct bfq_group_data *d = cpd_to_bfqgd(cpd);
-
-       d->weight = CGROUP_WEIGHT_DFL;
+       bgd->weight = CGROUP_WEIGHT_DFL;
+       return &bgd->pd;
 }
 
 static void bfq_cpd_free(struct blkcg_policy_data *cpd)
@@ -1300,7 +1295,6 @@ struct blkcg_policy blkcg_policy_bfq = {
        .legacy_cftypes         = bfq_blkcg_legacy_files,
 
        .cpd_alloc_fn           = bfq_cpd_alloc,
-       .cpd_init_fn            = bfq_cpd_init,
        .cpd_free_fn            = bfq_cpd_free,
 
        .pd_alloc_fn            = bfq_pd_alloc,

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 68b797b..18331cb 100644 (file)
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1249,8 +1249,6 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
                blkcg->cpd[i] = cpd;
                cpd->blkcg = blkcg;
                cpd->plid = i;
-               if (pol->cpd_init_fn)
-                       pol->cpd_init_fn(cpd);
        }
 
        spin_lock_init(&blkcg->lock);
@@ -1605,8 +1603,6 @@ int blkcg_policy_register(struct blkcg_policy *pol)
                        blkcg->cpd[pol->plid] = cpd;
                        cpd->blkcg = blkcg;
                        cpd->plid = pol->plid;
-                       if (pol->cpd_init_fn)
-                               pol->cpd_init_fn(cpd);
                }
        }
 

diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 26ce626..2c67886 100644 (file)
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -173,7 +173,6 @@ struct blkcg_policy {
 
        /* operations */
        blkcg_pol_alloc_cpd_fn          *cpd_alloc_fn;
-       blkcg_pol_init_cpd_fn           *cpd_init_fn;
        blkcg_pol_free_cpd_fn           *cpd_free_fn;
 
        blkcg_pol_alloc_pd_fn           *pd_alloc_fn;