linux-kernel - Re: [PATCH] mm/huge_memory: refactor after-split (page) cache code.

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Message-ID: <5464ABD7-C4C9-4BEF-9E5E-21F5A18C42D9@nvidia.com>
Date: Thu, 17 Jul 2025 11:45:13 -0400
From: Zi Yan <ziy@...dia.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 David Hildenbrand <david@...hat.com>,
 Dan Carpenter <dan.carpenter@...aro.org>,
 Antonio Quartulli <antonio@...delbit.com>, <linux-mm@...ck.org>,
 Hugh Dickins <hughd@...gle.com>, Kirill Shutemov <k.shutemov@...il.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Nico Pache <npache@...hat.com>,
 Ryan Roberts <ryan.roberts@....com>, Dev Jain <dev.jain@....com>,
 Barry Song <baohua@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/huge_memory: refactor after-split (page) cache code.

>>
>> Since we no longer need to make new_folio->index >= end work for anon
>> folios, can we drop the end = -1 in the if (is_anon) { ... } branch?
>
> Sure.

A second thought on this one. If I remove end = -1, can static analysis
tools understand that end is not used when a folio is anonymous?
Probably, I can initialize end to -1 and remove end = -1 in is_anon
branch.

Best Regards,
Yan, Zi