linux-kernel - Re: [PATCHv4 03/14] mm: Rename the 'compound_head' field in the 'struct page' to 'compound

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Message-ID: <AD4F2D9D-CBD7-4751-B00A-4C832D17E970@nvidia.com>
Date: Wed, 21 Jan 2026 11:34:57 -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 03/14] mm: Rename the 'compound_head' field in the
 'struct page' to 'compound_info'

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

> The 'compound_head' field in the 'struct page' encodes whether the page
> is a tail and where to locate the head page. Bit 0 is set if the page is
> a tail, and the remaining bits in the field point to the head page.
>
> As preparation for changing how the field encodes information about the
> head page, rename the field to 'compound_info'.
>
> Signed-off-by: Kiryl Shutsemau <kas@...nel.org>
> Reviewed-by: Muchun Song <muchun.song@...ux.dev>
> ---
>  .../admin-guide/kdump/vmcoreinfo.rst          |  2 +-
>  Documentation/mm/vmemmap_dedup.rst            |  6 +++---
>  include/linux/mm_types.h                      | 20 +++++++++----------
>  include/linux/page-flags.h                    | 18 ++++++++---------
>  include/linux/types.h                         |  2 +-
>  kernel/vmcore_info.c                          |  2 +-
>  mm/page_alloc.c                               |  2 +-
>  mm/slab.h                                     |  2 +-
>  mm/util.c                                     |  2 +-
>  9 files changed, 28 insertions(+), 28 deletions(-)
>
LGTM.

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

Best Regards,
Yan, Zi