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Date: Tue, 8 Sep 2026 10:55:12 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Tal Zussman <tz2294@columbia.edu>
Cc: Chris Li <chrisl@kernel.org>, Kairui Song <kasong@tencent.com>, Kemeng
 Shi <shikemeng@huaweicloud.com>, Nhat Pham <nphamcs@gmail.com>, Baoquan He
 <baoquan.he@linux.dev>, Barry Song <baohua@kernel.org>, Youngjun Park
 <youngjun.park@lge.com>, David Hildenbrand <david@kernel.org>, Zi Yan
 <ziy@nvidia.com>, Baolin Wang <baolin.wang@linux.alibaba.com>,
 "Liam R. Howlett" <liam@infradead.org>, Nico Pache <nico.pache@linux.dev>,
 Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>, Lance
 Yang <lance.yang@linux.dev>, Usama Arif <usama.arif@linux.dev>, Kiryl
 Shutsemau <kas@kernel.org>, Lorenzo Stoakes <ljs@kernel.org>, Rik van Riel
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 <harry@kernel.org>, Jann Horn <jannh@google.com>, Johannes Weiner
 <hannes@cmpxchg.org>, Yosry Ahmed <yosry@kernel.org>, Chengming Zhou
 <chengming.zhou@linux.dev>, Catalin Marinas <catalin.marinas@arm.com>, Will
 Deacon <will@kernel.org>, Mark Rutland <mark.rutland@arm.com>,
 linux-mm@kvack.org, linux-kernel@vger.kernel.org,
 linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 0/8] mm: remove page_swap_entry()
Message-Id: <20260908105512.8854d7972c82b6b6f417b0f8@linux-foundation.org>
In-Reply-To: <20260908-folio_swap_entry-v2-0-ee6d01dfa5e1@columbia.edu>
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On Tue, 08 Sep 2026 11:16:30 -0400 Tal Zussman <tz2294@columbia.edu> wrote:

> A folio in the swap cache occupies folio_nr_pages() contiguous swap
> entries starting at folio->swap, so a page's swap entry is just
> folio->swap plus the page's index in the folio. The swap entry is
> folio state, but the only helper for it is page-based:
> page_swap_entry() takes a page and recomputes the folio its callers
> already hold. Several callers avoid it by open-coding the arithmetic
> on folio->swap instead.
> 
> Add folio_swap_entry() and folio_page_swap_entry(), convert all users,
> and remove page_swap_entry(), with a few other cleanups along the way.

Thanks, I'll queue this for testing and further review.