linux-kernel - Re: [PATCH v3 02/25] mm: Add folio

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Message-ID: <4140A4A3-05E7-4A13-BB81-2AE4E0FDC34A@nvidia.com>
Date:   Mon, 1 Mar 2021 16:05:49 -0500
From:   Zi Yan <ziy@...dia.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
CC:     <linux-fsdevel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 02/25] mm: Add folio_pgdat

On 28 Jan 2021, at 2:03, Matthew Wilcox (Oracle) wrote:

> This is just a convenience wrapper for callers with folios; pgdat can
> be reached from tail pages as well as head pages.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
>  include/linux/mm.h | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index f20504017adf..7d787229dd40 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1503,6 +1503,11 @@ static inline pg_data_t *page_pgdat(const struct page *page)
>  	return NODE_DATA(page_to_nid(page));
>  }
>
> +static inline pg_data_t *folio_pgdat(const struct folio *folio)
> +{
> +	return page_pgdat(&folio->page);
> +}
> +
>  #ifdef SECTION_IN_PAGE_FLAGS
>  static inline void set_page_section(struct page *page, unsigned long section)
>  {
> -- 
> 2.29.2

LGTM.

Reviewed-by: Zi Yan <ziy@...dia.com>

—
Best Regards,
Yan Zi

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