linux-kernel - Re: [PATCH 3/5] mm/gup_test.c: Convert verify_dma

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Date:   Sat, 17 Jun 2023 20:29:26 +0100
From:   Lorenzo Stoakes <lstoakes@...il.com>
To:     "Vishal Moola (Oracle)" <vishal.moola@...il.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] mm/gup_test.c: Convert verify_dma_pinned() to us folios

On Tue, 13 Jun 2023 at 21:18, Vishal Moola (Oracle)
<vishal.moola@...il.com> wrote:
>
> verify_dma_pinned() checks that pages are dma-pinned. We can convert
> this to use folios.
>
> Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
> ---
>  mm/gup_test.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/mm/gup_test.c b/mm/gup_test.c
> index 8ae7307a1bb6..860b093b4b3e 100644
> --- a/mm/gup_test.c
> +++ b/mm/gup_test.c
> @@ -40,24 +40,25 @@ static void verify_dma_pinned(unsigned int cmd, struct page **pages,
>                               unsigned long nr_pages)
>  {
>         unsigned long i;
> -       struct page *page;
> +       struct folio *folio;
>
>         switch (cmd) {
>         case PIN_FAST_BENCHMARK:
>         case PIN_BASIC_TEST:
>         case PIN_LONGTERM_BENCHMARK:
>                 for (i = 0; i < nr_pages; i++) {
> -                       page = pages[i];
> -                       if (WARN(!page_maybe_dma_pinned(page),
> +                       folio = page_folio(pages[i]);
> +
> +                       if (WARN(!folio_maybe_dma_pinned(folio),
>                                  "pages[%lu] is NOT dma-pinned\n", i)) {
>
> -                               dump_page(page, "gup_test failure");
> +                               dump_page(&folio->page, "gup_test failure");
>                                 break;
>                         } else if (cmd == PIN_LONGTERM_BENCHMARK &&
> -                               WARN(!is_longterm_pinnable_page(page),
> +                               WARN(!folio_is_longterm_pinnable(folio),
>                                      "pages[%lu] is NOT pinnable but pinned\n",
>                                      i)) {
> -                               dump_page(page, "gup_test failure");
> +                               dump_page(&folio->page, "gup_test failure");
>                                 break;
>                         }
>                 }
> --
> 2.40.1
>
>

(Hope you don't mind me taking a look, GUP is of interest to me :)

Reviewed-by: Lorenzo Stoakes <lstoakes@...il.com>