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([2600:8802:b00:9ce0:a9c6:421a:26c5:f914]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29b5b107cc2sm176518725ad.16.2025.11.25.11.09.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Nov 2025 11:09:37 -0800 (PST) Message-ID: <851516d5-a5e8-47dd-82e0-3e34090e600d@gmail.com> Date: Tue, 25 Nov 2025 11:09:35 -0800 Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V3 1/6] block: ignore discard return value To: Jens Axboe , agk@redhat.com, snitzer@kernel.org, mpatocka@redhat.com, song@kernel.org, yukuai@fnnas.com, hch@lst.de, sagi@grimberg.me, kch@nvidia.com, jaegeuk@kernel.org, chao@kernel.org, cem@kernel.org Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, dm-devel@lists.linux.dev, linux-raid@vger.kernel.org, linux-nvme@lists.infradead.org, linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, bpf@vger.kernel.org, Johannes Thumshirn , "Martin K . Petersen" References: <20251124234806.75216-1-ckulkarnilinux@gmail.com> <20251124234806.75216-2-ckulkarnilinux@gmail.com> Content-Language: en-US From: Chaitanya Kulkarni In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11/25/25 09:38, Jens Axboe wrote: > On 11/24/25 4:48 PM, Chaitanya Kulkarni wrote: >> __blkdev_issue_discard() always returns 0, making the error check >> in blkdev_issue_discard() dead code. > Shouldn't it be a void instead then? > Yes, we have decided to clean up the callers first [1]. Once they are merged safely, after rc1 I'll send a patch [2] to make it void since it touches many different subsystems. -ck [1] https://marc.info/?l=linux-block&m=176405170918235&w=2 https://marc.info/?l=dm-devel&m=176345232320530&w=2 [2] From abdf4d1863a02d4be816aaab9a789f44bfca568f Mon Sep 17 00:00:00 2001 From: Chaitanya Kulkarni Date: Tue, 18 Nov 2025 10:35:58 -0800 Subject: [PATCH 6/6] block: change discar return type to void Now that all callers have been updated to not check the return value of __blkdev_issue_discard(), change its return type from int to void and remove the return 0 statement. This completes the cleanup of dead error checking code around __blkdev_issue_discard(). Signed-off-by: Chaitanya Kulkarni --- block/blk-lib.c | 3 +-- include/linux/blkdev.h | 2 +- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/block/blk-lib.c b/block/blk-lib.c index 19e0203cc18a..0a5f39325b2d 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -60,7 +60,7 @@ struct bio *blk_alloc_discard_bio(struct block_device *bdev, return bio; } -int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, +void __blkdev_issue_discard(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, struct bio **biop) { struct bio *bio; @@ -68,7 +68,6 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, while ((bio = blk_alloc_discard_bio(bdev, §or, &nr_sects, gfp_mask))) *biop = bio_chain_and_submit(*biop, bio); - return 0; } EXPORT_SYMBOL(__blkdev_issue_discard); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index f0ab02e0a673..b05c37d20b09 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1258,7 +1258,7 @@ extern void blk_io_schedule(void); int blkdev_issue_discard(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask); -int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, +void __blkdev_issue_discard(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, struct bio **biop); int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp); -- 2.40.0