Re: [PATCH 2/2] mm: filemap: batch mm counter updating in filemap_map_pages()

[Matthew Wilcox <willy@xxxxxxxxxxxxx>]

On Fri, Apr 12, 2024 at 10:57:04AM +0800, Kefeng Wang wrote:
>  	} while ((folio = next_uptodate_folio(&xas, mapping, end_pgoff)) != NULL);
> +
> +	add_mm_counter(vma->vm_mm, mm_counter_file(folio), rss);

Can't folio be NULL here?