linux-ext4 - [RFC PATCH 1/8] brd: use memcpy_from_page() in copy_from

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Message-Id: <20210207190425.38107-2-chaitanya.kulkarni@wdc.com>
Date:   Sun,  7 Feb 2021 11:04:18 -0800
From:   Chaitanya Kulkarni <chaitanya.kulkarni@....com>
To:     linux-block@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org
Cc:     axboe@...nel.dk, tytso@....edu, adilger.kernel@...ger.ca,
        jaegeuk@...nel.org, chao@...nel.org, johannes.thumshirn@....com,
        damien.lemoal@....com, bvanassche@....org,
        chaitanya.kulkarni@....com, dongli.zhang@...cle.com, clm@...com,
        ira.weiny@...el.com, dsterba@...e.com, ebiggers@...nel.org,
        hch@...radead.org, dave.hansen@...el.com
Subject: [RFC PATCH 1/8] brd: use memcpy_from_page() in copy_from_brd()

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@....com>
---
 drivers/block/brd.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index cb5c872ac9b2..d41b7d489e9f 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -226,11 +226,9 @@ static void copy_from_brd(void *dst, struct brd_device *brd,
 
 	copy = min_t(size_t, n, PAGE_SIZE - offset);
 	page = brd_lookup_page(brd, sector);
-	if (page) {
-		src = kmap_atomic(page);
-		memcpy(dst, src + offset, copy);
-		kunmap_atomic(src);
-	} else
+	if (page)
+		memcpy_from_page(dst, page, offset, copy);
+	else
 		memset(dst, 0, copy);
 
 	if (copy < n) {
-- 
2.22.1