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: <20250813075212.051b5178@kernel.org>
Date: Wed, 13 Aug 2025 07:52:12 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Pavel Begunkov <asml.silence@...il.com>
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 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.
So I'm happy for Andrew to take this, and dependent patches (if any)
can come in 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?

>   		/* Reset the page_type (which overlays _mapcount) */
>   		page->page_type = UINT_MAX;