block: move initialization of q->blkg_list into blkcg_init_queue

q->blkg_list is only used by blkcg code, so move it into
blkcg_init_queue.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20220211101149.2368042-3-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 671debb..35deace 100644 (file)
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1175,6 +1175,8 @@ int blkcg_init_queue(struct request_queue *q)
        bool preloaded;
        int ret;
 
+       INIT_LIST_HEAD(&q->blkg_list);
+
        new_blkg = blkg_alloc(&blkcg_root, q, GFP_KERNEL);
        if (!new_blkg)
                return -ENOMEM;

diff --git a/block/blk-core.c b/block/blk-core.c
index be8812f..ff972b9 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -476,9 +476,6 @@ struct request_queue *blk_alloc_queue(int node_id, bool alloc_srcu)
        timer_setup(&q->timeout, blk_rq_timed_out_timer, 0);
        INIT_WORK(&q->timeout_work, blk_timeout_work);
        INIT_LIST_HEAD(&q->icq_list);
-#ifdef CONFIG_BLK_CGROUP
-       INIT_LIST_HEAD(&q->blkg_list);
-#endif
 
        kobject_init(&q->kobj, &blk_queue_ktype);