linux-kernel - Re: [PATCH v6 1/5] mm/zone_device: Reinitialize large zone device private folios

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Message-Id: <20260122134114.a04ddf4c34a4b926d057032f@linux-foundation.org>
Date: Thu, 22 Jan 2026 13:41:14 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Balbir Singh <balbirs@...dia.com>
Cc: Vlastimil Babka <vbabka@...e.cz>, Matthew Brost
 <matthew.brost@...el.com>, Zi Yan <ziy@...dia.com>, Jason Gunthorpe
 <jgg@...dia.com>, Matthew Wilcox <willy@...radead.org>, Alistair Popple
 <apopple@...dia.com>, Francois Dugast <francois.dugast@...el.com>,
 intel-xe@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 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>, Leon Romanovsky <leon@...nel.org>, Lorenzo Stoakes
 <lorenzo.stoakes@...cle.com>, "Liam R . Howlett" <Liam.Howlett@...cle.com>,
 Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>,
 Michal Hocko <mhocko@...e.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 v6 1/5] mm/zone_device: Reinitialize large zone device
 private folios

On Thu, 22 Jan 2026 20:10:44 +1100 Balbir Singh <balbirs@...dia.com> wrote:

> >> - Intel has demonstrated that this works and is still getting blocked.
> >>
> >> - This entire thread is about a fixes patch for large device pages.
> >>   Changing prep_compound_page is completely out of scope for a fixes
> >>   patch, and honestly so is most of the rest of what’s being proposed.
> > 
> > FWIW I'm ok if this lands as a fix patch, and perceived the discussion to be
> > about how refactor things more properly afterwards, going forward.
> > 
> 
> I've said the same thing and I concur, we can use the patch as-is and
> change this to set the relevant identified fields after 6.19

So the plan is to add this patch to 6.19-rc and take another look at
patches [2-5] during next -rc cycle?

I think the plan is to take Matthew's work via the DRM tree?  But if people
want me to patchbunny this fix then please lmk.

I presently have

Signed-off-by: Matthew Brost <matthew.brost@...el.com>
Signed-off-by: Francois Dugast <francois.dugast@...el.com>
Acked-by: Felix Kuehling <felix.kuehling@....com>
Reviewed-by: Balbir Singh <balbirs@...dia.com>

If people wish to add to this then please do so.

I'll restore this patch into mm.git's hotfix branch (and hence
linux-next) because testing.