linux-kernel - Re: [PATCH] pagemap: Update BUDDY flag documentation

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Message-ID: <1a2329ef-50ff-4e48-87b4-3adc70ee8833@kernel.org>
Date: Mon, 24 Nov 2025 11:47:17 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Richard Weinberger <richard@....at>, linux-mm@...ck.org
Cc: linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, corbet@....net,
 mhocko@...e.com, surenb@...gle.com, rppt@...nel.org, vbabka@...e.cz,
 Liam.Howlett@...cle.com, lorenzo.stoakes@...cle.com,
 akpm@...ux-foundation.org, Vladimir Davydov <vdavydov@...tuozzo.com>,
 Konstantin Khlebnikov <koct9i@...il.com>,
 Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] pagemap: Update BUDDY flag documentation

On 11/22/25 22:19, Richard Weinberger wrote:
> Since v4.6 the BUDDY flag is set for _all_ pages in the block
> and no longer just for the first one.
> This change was introduced by:
> commit 832fc1de01ae ("/proc/kpageflags: return KPF_BUDDY for "tail" buddy pages")
> 
> Strictly speaking, this was an ABI change, but as nobody has noticed
> since 2016, let's just update the documentation.
> 
> Cc: Vladimir Davydov <vdavydov@...tuozzo.com>>
> Cc: Konstantin Khlebnikov <koct9i@...il.com>
> Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Richard Weinberger <richard@....at>
> ---

Acked-by: David Hildenbrand (Red Hat) <david@...nel.org>

-- 
Cheers

David