linux-kernel - Re: [PATCH v2 5/5] mm: Remove is_longterm_pinnable_page() and Reimplement folio_is_longterm

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Message-ID: <CAA5enKbCuFqURVcPeYvboQYR8XMXzg9DzW-TghuF1HNbWHgwFQ@mail.gmail.com>
Date:   Sat, 17 Jun 2023 21:50:26 +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, Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v2 5/5] mm: Remove is_longterm_pinnable_page() and
 Reimplement folio_is_longterm_pinnable()

On Wed, 14 Jun 2023 at 03:14, Vishal Moola (Oracle)
<vishal.moola@...il.com> wrote:
>
> folio_is_longterm_pinnable() already exists as a wrapper function. Now
> that the whole implementation of is_longterm_pinnable_page() can be
> implemented using folios, folio_is_longterm_pinnable() can be made its
> own standalone function - and we can remove is_longterm_pinnable_page().
>
> Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
> Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
>  include/linux/mm.h | 22 +++++++++-------------
>  1 file changed, 9 insertions(+), 13 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 27ce77080c79..e2d35e272e07 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1910,39 +1910,35 @@ static inline bool page_needs_cow_for_dma(struct vm_area_struct *vma,
>         return page_maybe_dma_pinned(page);
>  }
>
> -/* MIGRATE_CMA and ZONE_MOVABLE do not allow pin pages */
> +/* MIGRATE_CMA and ZONE_MOVABLE do not allow pin folios */
>  #ifdef CONFIG_MIGRATION
> -static inline bool is_longterm_pinnable_page(struct page *page)
> +static inline bool folio_is_longterm_pinnable(struct folio *folio)
>  {
>  #ifdef CONFIG_CMA
> -       int mt = get_pageblock_migratetype(page);
> +       int mt = folio_migratetype(folio);
>
>         if (mt == MIGRATE_CMA || mt == MIGRATE_ISOLATE)
>                 return false;
>  #endif
>         /* The zero page may always be pinned */
> -       if (is_zero_pfn(page_to_pfn(page)))
> +       if (is_zero_pfn(folio_pfn(folio)))
>                 return true;
>
>         /* Coherent device memory must always allow eviction. */
> -       if (is_device_coherent_page(page))
> +       if (folio_is_device_coherent(folio))
>                 return false;
>
> -       /* Otherwise, non-movable zone pages can be pinned. */
> -       return !is_zone_movable_page(page);
> +       /* Otherwise, non-movable zone folios can be pinned. */
> +       return !folio_is_zone_movable(folio);
> +

Nit, but you're adding a newline here.

>  }
>  #else
> -static inline bool is_longterm_pinnable_page(struct page *page)
> +static inline bool folio_is_longterm_pinnable(struct folio *folio)
>  {
>         return true;
>  }
>  #endif
>
> -static inline bool folio_is_longterm_pinnable(struct folio *folio)
> -{
> -       return is_longterm_pinnable_page(&folio->page);
> -}
> -
>  static inline void set_page_zone(struct page *page, enum zone_type zone)
>  {
>         page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
> --
> 2.40.1
>
>

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