Re: [PATCH 02/10] mm/nommu: use file_has_valid_mmap_hooks() helper
Vlastimil Babka <[email protected]> Tue, 17 Jun 2025 20:58:10 +0200
| Newsgroups | gmane.linux.kernel.aio.general,gmane.linux.block,gmane.linux.kernel,gmane.comp.freedesktop.xorg.drivers.intel,gmane.comp.video.dri.devel,gmane.linux.file-systems,gmane.linux.file-systems.union,gmane.linux.kernel.mm,gmane.comp.file-systems.btrfs,gmane.comp.file-systems.ceph.devel,gmane.comp.file-systems.coda.general,gmane.comp.file-systems.ecryptfs.general,gmane.comp.file-systems.ext4,gmane.linux.file-systems.f2fs,gmane.linux.uml.devel,gmane.linux.drivers.mtd,gmane.linux.nfs,gmane.comp.file-systems.nilfs.user,gmane.linux.hardware.karma.devel,gmane.linux.kernel.cifs,gmane.network.samba.internals |
|---|---|
| Message-ID | <[email protected]> |
On 6/16/25 21:33, Lorenzo Stoakes wrote:
> Since commit c84bf6dd2b83 ("mm: introduce new .mmap_prepare() file
> callback"), the f_op->mmap() hook has been deprecated in favour of
> f_op->mmap_prepare().
>
> Therefore, update the check for file operations supporting mmap() by using
> the file_has_valid_mmap_hooks() helper function, which checks for either
> f_op->mmap or f_op->mmap_prepare rather than checking only for f_op->mmap
> directly.
>
> Signed-off-by: Lorenzo Stoakes <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
> ---
> mm/nommu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/nommu.c b/mm/nommu.c
> index b624acec6d2e..38c22ea0a95c 100644
> --- a/mm/nommu.c
> +++ b/mm/nommu.c
> @@ -719,7 +719,7 @@ static int validate_mmap_request(struct file *file,
>
> if (file) {
> /* files must support mmap */
> - if (!file->f_op->mmap)
> + if (!file_has_valid_mmap_hooks(file))
> return -ENODEV;
>
> /* work out if what we've got could possibly be shared
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