unimore/kernel-hacking-2024-linux-steffo
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fs/ext2: Replace kmap_atomic() with kmap_local_page()

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kmap_atomic() is deprecated in favor of kmap_local_page(). Therefore,
replace kmap_atomic() with kmap_local_page().

kmap_atomic() is implemented like a kmap_local_page() which also disables
page-faults and preemption (the latter only for !PREEMPT_RT kernels).

However, the code within the mapping and un-mapping in ext2_make_empty()
does not depend on the above-mentioned side effects.

Therefore, a mere replacement of the old API with the new one is all it
is required (i.e., there is no need to explicitly add any calls to
pagefault_disable() and/or preempt_disable()).

Suggested-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20221231174205.8492-1-fmdefrancesco@gmail.com>
This commit is contained in:
Fabio M. De Francesco 2022-12-31 18:42:05 +01:00 committed by Jan Kara
parent b316c443b4
commit 96b87cbdeb
1 changed files with 2 additions and 2 deletions
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4
fs/ext2/dir.c
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@ -646,7 +646,7 @@ int ext2_make_empty(struct inode *inode, struct inode *parent)
unlock_page(page);
goto fail;
}
kaddr = kmap_atomic(page);
kaddr = kmap_local_page(page);
memset(kaddr, 0, chunk_size);
de = (struct ext2_dir_entry_2 *)kaddr;
de->name_len = 1;
@ -661,7 +661,7 @@ int ext2_make_empty(struct inode *inode, struct inode *parent)
de->inode = cpu_to_le32(parent->i_ino);
memcpy (de->name, "..\0", 4);
ext2_set_de_type (de, inode);
kunmap_atomic(kaddr);
kunmap_local(kaddr);
ext2_commit_chunk(page, 0, chunk_size);
err = ext2_handle_dirsync(inode);
fail: