On Tue, Jun 13, 2023 at 05:53:45PM -0400, Peter Xu wrote:
> + if (page_increm > 1)
> + WARN_ON_ONCE(
> + try_grab_folio(compound_head(page),
You don't need to call compound_head() here; try_grab_folio() works
on tail pages just fine.
> + page_increm - 1,
> + foll_flags) == NULL);
> +
> + for (j = 0; j < page_increm; j++) {
> + subpage = nth_page(page, j);
> + pages[i+j] = subpage;
> + flush_anon_page(vma, subpage, start + j * PAGE_SIZE);
> + flush_dcache_page(subpage);
You're better off calling flush_dcache_folio() right at the end.
