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

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Message-ID: <aWhZ+eVZQ5oHMK0u@lstrano-desk.jf.intel.com>
Date: Wed, 14 Jan 2026 19:07:37 -0800
From: Matthew Brost <matthew.brost@...el.com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: Francois Dugast <francois.dugast@...el.com>,
	<intel-xe@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>, 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>, Oscar Salvador <osalvador@...e.de>, "Jason
 Gunthorpe" <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>, Lorenzo Stoakes
	<lorenzo.stoakes@...cle.com>, "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, Jan 14, 2026 at 07:01:54PM -0800, Andrew Morton wrote:
> On Wed, 14 Jan 2026 20:19:52 +0100 Francois Dugast <francois.dugast@...el.com> wrote:
> 
> > From: Matthew Brost <matthew.brost@...el.com>
> > 
> > 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.
> > 
> > --- a/drivers/gpu/drm/drm_pagemap.c
> > +++ b/drivers/gpu/drm/drm_pagemap.c
> > @@ -201,7 +201,7 @@ static void drm_pagemap_get_devmem_page(struct page *page,
> >  					struct drm_pagemap_zdd *zdd)
> >  {
> >  	page->zone_device_data = drm_pagemap_zdd_get(zdd);
> > -	zone_device_page_init(page, 0);
> > +	zone_device_page_init(page, zdd->dpagemap->pagemap, 0);
> >  }
> 
> drivers/gpu/drm/drm_pagemap.c:200:40: error: 'struct drm_pagemap_zdd' has no member named 'dpagemap'
> 
> I guess this was accidentally fixed in a later patch?
> 

Ah, no. This is because we merged some in drm-tip which is not 6.19,
this is based on the drm-tip branch.

> Please let's decide whether to fast-track the [1/N] fix into mainline
> and if so, prepare something which compiles!

Maybe we just take this through the MM repo then? I suppose I should
send out patch which applies to the MM repo? I just cloned that repo.

Matt