linux-kernel - Re: [PATCH v3] mm/page_alloc: clear page->private in free_pages

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Message-ID: <51f96b31-fb59-4cda-9d33-e3cebc45686b@kernel.org>
Date: Sat, 7 Feb 2026 23:08:03 +0100
From: "David Hildenbrand (Arm)" <david@...nel.org>
To: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>, linux-mm@...ck.org
Cc: akpm@...ux-foundation.org, vbabka@...e.cz, surenb@...gle.com,
 mhocko@...e.com, jackmanb@...gle.com, hannes@...xchg.org, ziy@...dia.com,
 npiggin@...il.com, linux-kernel@...r.kernel.org, kasong@...cent.com,
 hughd@...gle.com, chrisl@...nel.org, ryncsn@...il.com,
 stable@...r.kernel.org, willy@...radead.org
Subject: Re: [PATCH v3] mm/page_alloc: clear page->private in
 free_pages_prepare()

> 
> -               /*
> -                * page->private should not be set in tail pages. Fix up 
> and warn once
> -                * if private is unexpectedly set.
> -                */
> -               if (unlikely(new_folio->private)) {
> -                       VM_WARN_ON_ONCE_PAGE(true, new_head);
> -                       new_folio->private = NULL;
> -               }

BTW, I wonder whether we should bring that check back for non-device folios.

-- 
Cheers,

David