mm/nommu: use file_has_valid_mmap_hooks() helper

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 <lorenzo.stoakes@oracle.com>
Link: https://lore.kernel.org/5f120b644b5890d1b50202d0f0d4c9f0d6b62873.1750099179.git.lorenzo.stoakes@oracle.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/mm/nommu.c b/mm/nommu.c
index b624acec6d2ee50e3c35d72ae9d705fec4b613b4..38c22ea0a95c663fe99ad935490cdd6eaf63061c 100644 (file)
--- 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