linux-kernel - Re: [PATCHv4 06/14] mm: Make page

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Message-ID: <05053F70-2885-494D-91E6-C447EC1A1676@nvidia.com>
Date: Wed, 21 Jan 2026 11:28:48 -0500
From: Zi Yan <ziy@...dia.com>
To: Kiryl Shutsemau <kas@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Muchun Song <muchun.song@...ux.dev>, David Hildenbrand <david@...nel.org>,
 Matthew Wilcox <willy@...radead.org>, Usama Arif <usamaarif642@...il.com>,
 Frank van der Linden <fvdl@...gle.com>, Oscar Salvador <osalvador@...e.de>,
 Mike Rapoport <rppt@...nel.org>, Vlastimil Babka <vbabka@...e.cz>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.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: [PATCHv4 06/14] mm: Make page_zonenum() use head page

On 21 Jan 2026, at 11:22, Kiryl Shutsemau wrote:

> With the upcoming changes to HVO, a single page of tail struct pages
> will be shared across all huge pages of the same order on a node. Since
> huge pages on the same node may belong to different zones, the zone
> information stored in shared tail page flags would be incorrect.
>
> Always fetch zone information from the head page, which has unique and
> correct zone flags for each compound page.
>
> Signed-off-by: Kiryl Shutsemau <kas@...nel.org>
> ---
>  include/linux/mmzone.h | 1 +
>  1 file changed, 1 insertion(+)
>
Make sense.

Acked-by: Zi Yan <ziy@...dia.com>

Best Regards,
Yan, Zi