netdev - Re: [PATCH net-next v9 3/8] page_pool: access ->pp_magic through struct netmem_desc in page_pool_page_is

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Message-ID: <72861320-2b54-47da-993d-a82050cf56c2@gmail.com>
Date: Mon, 28 Jul 2025 19:19:11 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: Byungchul Park <byungchul@...com>
Cc: Mina Almasry <almasrymina@...gle.com>,
 David Hildenbrand <david@...hat.com>,
 "willy@...radead.org" <willy@...radead.org>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org, kernel_team@...ynix.com,
 kuba@...nel.org, ilias.apalodimas@...aro.org, harry.yoo@...cle.com,
 hawk@...nel.org, akpm@...ux-foundation.org, davem@...emloft.net,
 john.fastabend@...il.com, andrew+netdev@...n.ch, toke@...hat.com,
 tariqt@...dia.com, edumazet@...gle.com, pabeni@...hat.com,
 saeedm@...dia.com, leon@...nel.org, ast@...nel.org, daniel@...earbox.net,
 lorenzo.stoakes@...cle.com, Liam.Howlett@...cle.com, vbabka@...e.cz,
 rppt@...nel.org, surenb@...gle.com, mhocko@...e.com, horms@...nel.org,
 linux-rdma@...r.kernel.org, bpf@...r.kernel.org, vishal.moola@...il.com,
 hannes@...xchg.org, ziy@...dia.com, jackmanb@...gle.com
Subject: Re: [PATCH net-next v9 3/8] page_pool: access ->pp_magic through
 struct netmem_desc in page_pool_page_is_pp()

On 7/22/25 02:23, Byungchul Park wrote:
> On Thu, Jul 17, 2025 at 12:08:58PM +0900, Byungchul Park wrote:
>> On Sat, Jul 12, 2025 at 02:58:14PM +0100, Pavel Begunkov wrote:
>>> On 7/11/25 02:14, Byungchul Park wrote:
...>>> commit 8fc2347fb3ff4a3fc7929c70a5a21e1128935d4a
>>> Author: Pavel Begunkov <asml.silence@...il.com>
>>> Date:   Sat Jul 12 14:29:52 2025 +0100
>>>
>>>      net/mm: use PGTY for tracking page pool pages
>>>
>>>      Currently, we use page->pp_magic to determine whether a page belongs to
>>>      a page pool. It's not ideal as the field is aliased with other page
>>>      types, and thus needs to to rely on elaborated rules to work. Add a new
>>>      page type for page pool.
>>
>> Hi Pavel,
>>
>> I need this work to be done to remove ->pp_magic in struct page.  Will
>> you let me work on this work?  Or can you please refine and post this
> 
> No response I got.  Thus, I started.  I hope you understand.
Missed the first message and then got busy. Anyway, sure, go ahead.

-- 
Pavel Begunkov