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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
This commit is contained in:
Eric Biggers 2022-08-18 15:40:10 -07:00
parent c987918a3f
commit 8377e8a24b
1 changed files with 3 additions and 3 deletions

6
fs/verity/read_metadata.c
View File

@ -53,14 +53,14 @@ static int fsverity_read_merkle_tree(struct inode *inode,
break; break;
} }
virt = kmap(page); virt = kmap_local_page(page);
if (copy_to_user(buf, virt + offs_in_page, bytes_to_copy)) { if (copy_to_user(buf, virt + offs_in_page, bytes_to_copy)) {
kunmap(page); kunmap_local(virt);
put_page(page); put_page(page);
err = -EFAULT; err = -EFAULT;
break; break;
} }
kunmap(page); kunmap_local(virt);
put_page(page); put_page(page);
retval += bytes_to_copy; retval += bytes_to_copy;