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From:   Pankaj Raghav <p.raghav@samsung.com>
To:     senozhatsky@chromium.org, viro@zeniv.linux.org.uk, axboe@kernel.dk,
        willy@infradead.org, brauner@kernel.org, akpm@linux-foundation.org,
        minchan@kernel.org, hubcap@omnibond.com, martin@omnibond.com
Cc:     mcgrof@kernel.org, devel@lists.orangefs.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-block@vger.kernel.org, gost.dev@samsung.com,
        Pankaj Raghav <p.raghav@samsung.com>
Subject: [RFC v2 1/5] zram: remove zram_page_end_io function
Date:   Wed, 22 Mar 2023 14:50:09 +0100
Message-Id: <20230322135013.197076-2-p.raghav@samsung.com>
In-Reply-To: <20230322135013.197076-1-p.raghav@samsung.com>
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References: <20230322135013.197076-1-p.raghav@samsung.com>
        <CGME20230322135015eucas1p1bd186e83b322213cc852c4ad6eb47090@eucas1p1.samsung.com>
Precedence: bulk

zram_page_end_io function is called when alloc_page is used (for
partial IO) to trigger writeback from the user space. The pages used for
this operation is never locked or have the writeback set. So, it is safe
to remove zram_page_end_io function that unlocks or marks writeback end
on the page.

Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
---
 drivers/block/zram/zram_drv.c | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index b7bb52f8dfbd..2341f4009b0f 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -606,15 +606,6 @@ static void free_block_bdev(struct zram *zram, unsigned long blk_idx)
 	atomic64_dec(&zram->stats.bd_count);
 }
 
-static void zram_page_end_io(struct bio *bio)
-{
-	struct page *page = bio_first_page_all(bio);
-
-	page_endio(page, op_is_write(bio_op(bio)),
-			blk_status_to_errno(bio->bi_status));
-	bio_put(bio);
-}
-
 /*
  * Returns 1 if the submission is successful.
  */
@@ -634,9 +625,7 @@ static int read_from_bdev_async(struct zram *zram, struct bio_vec *bvec,
 		return -EIO;
 	}
 
-	if (!parent)
-		bio->bi_end_io = zram_page_end_io;
-	else
+	if (parent)
 		bio_chain(bio, parent);
 
 	submit_bio(bio);
-- 
2.34.1