linux-kernel - Re: [PATCH v1] mm: convert folio

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Message-Id: <20250924081709.63722-1-sj@kernel.org>
Date: Wed, 24 Sep 2025 01:17:09 -0700
From: SeongJae Park <sj@...nel.org>
To: David Hildenbrand <david@...hat.com>
Cc: SeongJae Park <sj@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH v1] mm: convert folio_page() back to a macro

On Tue, 23 Sep 2025 16:00:58 +0200 David Hildenbrand <david@...hat.com> wrote:

> In commit 73b3294b1152 ("mm: simplify folio_page() and folio_page_idx()")
> we converted folio_page() into a static inline function. However
> briefly afterwards in commit a847b17009ec ("mm: constify highmem related
> functions for improved const-correctness") we had to add some nasty
> const-away casting to make the compiler happy when checking const
> correctness.
> 
> So let's just convert it back to a simple macro so the compiler can
> check const correctness properly. There is the alternative of
> using a _Generic() similar to page_folio(), but there is not a lot of
> benefit compared to just using a simple macro.
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> Cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: Mike Rapoport <rppt@...nel.org>
> Cc: Suren Baghdasaryan <surenb@...gle.com>
> Cc: Michal Hocko <mhocko@...e.com>
> Signed-off-by: David Hildenbrand <david@...hat.com>

Reviewed-by: SeongJae Park <sj@...nel.org>


Thanks,
SJ

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