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Date:   Sun,  7 Feb 2021 11:04:22 -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 5/8] ext4: use memcpy_from_page() in pagecache_read()

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@....com>
---
 fs/ext4/verity.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
index 5b7ba8f71153..c8e07f8a792d 100644
--- a/fs/ext4/verity.c
+++ b/fs/ext4/verity.c
@@ -45,16 +45,13 @@ static int pagecache_read(struct inode *inode, void *buf, size_t count,
 		size_t n = min_t(size_t, count,
 				 PAGE_SIZE - offset_in_page(pos));
 		struct page *page;
-		void *addr;
 
 		page = read_mapping_page(inode->i_mapping, pos >> PAGE_SHIFT,
 					 NULL);
 		if (IS_ERR(page))
 			return PTR_ERR(page);
 
-		addr = kmap_atomic(page);
-		memcpy(buf, addr + offset_in_page(pos), n);
-		kunmap_atomic(addr);
+		memcpy_from_page(buf, page, offset_in_page(pos), n);
 
 		put_page(page);
 
-- 
2.22.1

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