netdev - Re: [RFC mm v5 2/2] mm: introduce a new page type for page pool in page type

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Message-ID: <4ab9d277-97ef-414d-bb5d-910fd8964c2b@gmail.com>
Date: Thu, 6 Nov 2025 11:08:35 +0000
From: Pavel Begunkov <asml.silence@...il.com>
To: Byungchul Park <byungchul@...com>, linux-mm@...ck.org,
 netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, kernel_team@...ynix.com,
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Subject: Re: [RFC mm v5 2/2] mm: introduce a new page type for page pool in
 page type

On 11/3/25 07:51, Byungchul Park wrote:
> Currently, the condition 'page->pp_magic == PP_SIGNATURE' is used to
> determine if a page belongs to a page pool.  However, with the planned
> removal of ->pp_magic, we should instead leverage the page_type in
> struct page, such as PGTY_netpp, for this purpose.
> 
> Introduce and use the page type APIs e.g. PageNetpp(), __SetPageNetpp(),
> and __ClearPageNetpp() instead, and remove the existing APIs accessing
> ->pp_magic e.g. page_pool_page_is_pp(), netmem_or_pp_magic(), and
> netmem_clear_pp_magic().
> 
> This work was inspired by the following link:
> 
> [1] https://lore.kernel.org/all/582f41c0-2742-4400-9c81-0d46bf4e8314@gmail.com/
> 
> While at it, move the sanity check for page pool to on free.

Looks good to me

Reviewed-by: Pavel Begunkov <asml.silence@...il.com>

-- 
Pavel Begunkov