linux-kernel - Re: [PATCH 07/11] mm: Drop fake head checks and fix a race condition

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Message-ID: <17002374-e135-46a5-9e4c-c317ac9823ae@gmail.com>
Date: Sat, 6 Dec 2025 17:27:29 +0000
From: Usama Arif <usamaarif642@...il.com>
To: Kiryl Shutsemau <kas@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Muchun Song <muchun.song@...ux.dev>
Cc: David Hildenbrand <david@...nel.org>, Oscar Salvador <osalvador@...e.de>,
 Mike Rapoport <rppt@...nel.org>, Vlastimil Babka <vbabka@...e.cz>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Matthew Wilcox <willy@...radead.org>, Zi Yan <ziy@...dia.com>,
 Baoquan He <bhe@...hat.com>, Michal Hocko <mhocko@...e.com>,
 Johannes Weiner <hannes@...xchg.org>, Jonathan Corbet <corbet@....net>,
 kernel-team@...a.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org
Subject: Re: [PATCH 07/11] mm: Drop fake head checks and fix a race condition



On 05/12/2025 19:43, Kiryl Shutsemau wrote:
> Fake heads are no longer in use, so checks for them should be removed.
> 
> It simplifies compound_head() and page_ref_add_unless() substantially.
> 

Would be good to mention in the commit message what the race condition is as
its there in the subject. Probably can copy some text from the cover letter.