From 8377e8a24bba1ae73b3869bc71ee9df16b6bef61 Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@google.com>
Date: Thu, 18 Aug 2022 15:40:10 -0700
Subject: [PATCH] fs-verity: use kmap_local_page() instead of kmap()
Convert the use of kmap() to its recommended replacement
kmap_local_page(). This avoids the overhead of doing a non-local
mapping, which is unnecessary in this case.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Link: https://lore.kernel.org/r/20220818224010.43778-1-ebiggers@kernel.org
---
fs/verity/read_metadata.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/verity/read_metadata.c b/fs/verity/read_metadata.c
index 6ee849dc7bc18..2aefc5565152a 100644
--- a/fs/verity/read_metadata.c
+++ b/fs/verity/read_metadata.c
@@ -53,14 +53,14 @@ static int fsverity_read_merkle_tree(struct inode *inode,
break;
}
- virt = kmap(page);
+ virt = kmap_local_page(page);
if (copy_to_user(buf, virt + offs_in_page, bytes_to_copy)) {
- kunmap(page);
+ kunmap_local(virt);
put_page(page);
err = -EFAULT;
break;
}
- kunmap(page);
+ kunmap_local(virt);
put_page(page);
retval += bytes_to_copy;
--
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