linux-kernel - Re: [PATCH linux-next v3] mm, page_pool: introduce a new page type for page pool in page type

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Message-ID: <e8d33a38-6465-432a-9c28-25f2689e95da@gmail.com>
Date: Thu, 14 Aug 2025 10:42:47 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Byungchul Park <byungchul@...com>, akpm@...ux-foundation.org,
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Subject: Re: [PATCH linux-next v3] mm, page_pool: introduce a new page type
 for page pool in page type

On 8/13/25 15:52, Jakub Kicinski wrote:
> On Wed, 13 Aug 2025 12:18:56 +0100 Pavel Begunkov wrote:
>> It should go to net, there will be enough of conflicts otherwise.
>> mm maintainers, do you like it as a shared branch or can it just
>> go through the net tree?
> 
> Looks like this is 100% in mm, and the work is not urgent at all.

There is a slight dependency in rc1, but we should be able to
massage it to be mm only.

> So I'm happy for Andrew to take this, and dependent patches (if any)
> can come in the next cycle.

Yeah, good option. It'd be a good idea to cut the diff down to
avoid removing the relevant mm page state checks until the next
cycle.
  >> @@ -1379,9 +1376,11 @@ __always_inline bool free_pages_prepare(struct page *page,
>>    		mod_mthp_stat(order, MTHP_STAT_NR_ANON, -1);
>>    		folio->mapping = NULL;
>>    	}
>> -	if (unlikely(page_has_type(page)))
>> +	if (unlikely(page_has_type(page))) {
>> +		WARN_ON_ONCE(PageNet_pp(page));
> 
> I guess my ask to add a comment here got ignored?

It's an old patch attached as a point of reference. Any actual submission
surely will need to follow up on the reviews.

-- 
Pavel Begunkov