linux-kernel - [PATCH 10/14] blk-cgroup: remove the !bio->bi_blkg check in blkcg_bio_issue

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Date:   Sat, 27 Jun 2020 09:31:55 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...nel.dk>, Tejun Heo <tj@...nel.org>
Cc:     Dennis Zhou <dennis@...nel.org>, Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>, dm-devel@...hat.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH 10/14] blk-cgroup: remove the !bio->bi_blkg check in blkcg_bio_issue_check

This is purely a sanity check for grave programming errors.  Remove it
to simplify further work in this area.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 include/linux/blk-cgroup.h | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index 60df97202314c7..8e86b598316c10 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -543,24 +543,11 @@ static inline void blkcg_bio_issue_init(struct bio *bio)
 static inline bool blkcg_bio_issue_check(struct request_queue *q,
 					 struct bio *bio)
 {
-	struct blkcg_gq *blkg;
+	struct blkcg_gq *blkg = bio->bi_blkg;
 	bool throtl = false;
 
 	rcu_read_lock();
-
-	if (!bio->bi_blkg) {
-		char b[BDEVNAME_SIZE];
-
-		WARN_ONCE(1,
-			  "no blkg associated for bio on block-device: %s\n",
-			  bio_devname(bio, b));
-		bio_associate_blkg(bio);
-	}
-
-	blkg = bio->bi_blkg;
-
 	throtl = blk_throtl_bio(q, blkg, bio);
-
 	if (!throtl) {
 		struct blkg_iostat_set *bis;
 		int rwd, cpu;
-- 
2.26.2