> +static struct folio *kvm_gmem_get_folio(struct file *file, pgoff_t index)
> +{
> + struct folio *folio;
> +
> + /* TODO: Support huge pages. */
> + folio = filemap_grab_folio(file->f_mapping, index);
> + if (!folio)
> + return NULL;
In Linux 6.4, filemap_grab_folio() may also return an error value.
Instead of just checking for NULL, "IS_ERR_OR_NULL(folio)" will be needed.
