linux-kernel - Re: [PATCH v5 1/5] mm/zone_device: Reinitialize large zone device private folios

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Message-Id: <20260114134825.8bf1cb3e897c8e41c73dc8ae@linux-foundation.org>
Date: Wed, 14 Jan 2026 13:48:25 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Francois Dugast <francois.dugast@...el.com>
Cc: intel-xe@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, Matthew
 Brost <matthew.brost@...el.com>, Zi Yan <ziy@...dia.com>, Alistair Popple
 <apopple@...dia.com>, adhavan Srinivasan <maddy@...ux.ibm.com>, Nicholas
 Piggin <npiggin@...il.com>, Michael Ellerman <mpe@...erman.id.au>,
 "Christophe Leroy (CS GROUP)" <chleroy@...nel.org>, Felix Kuehling
 <Felix.Kuehling@....com>, Alex Deucher <alexander.deucher@....com>,
 Christian König <christian.koenig@....com>, David Airlie
 <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, Lyude Paul <lyude@...hat.com>,
 Danilo Krummrich <dakr@...nel.org>, David Hildenbrand <david@...nel.org>,
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 "Liam R . Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka
 <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan
 <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>, Balbir Singh
 <balbirs@...dia.com>, linuxppc-dev@...ts.ozlabs.org, kvm@...r.kernel.org,
 linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
 nouveau@...ts.freedesktop.org, linux-mm@...ck.org,
 linux-cxl@...r.kernel.org
Subject: Re: [PATCH v5 1/5] mm/zone_device: Reinitialize large zone device
 private folios

On Wed, 14 Jan 2026 20:19:52 +0100 Francois Dugast <francois.dugast@...el.com> wrote:

> Reinitialize metadata for large zone device private folios in
> zone_device_page_init prior to creating a higher-order zone device
> private folio. This step is necessary when the folio’s order changes
> dynamically between zone_device_page_init calls to avoid building a
> corrupt folio. As part of the metadata reinitialization, the dev_pagemap
> must be passed in from the caller because the pgmap stored in the folio
> page may have been overwritten with a compound head.

Thanks.  What are the worst-case userspace-visible effects of the bug?