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

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Message-ID: <w37swembg3m2ruxrlbm4xpx4eccvp3fsd7e4shfdxcpmpisk3x@dqsxzkyabjc6>
Date: Fri, 23 Jan 2026 09:53:09 +1100
From: Alistair Popple <apopple@...dia.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Balbir Singh <balbirs@...dia.com>, 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>, 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 2026-01-23 at 08:41 +1100, Andrew Morton <akpm@...ux-foundation.org> wrote...
> 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'm ok with this as a a quick fix, and happy to take a look at cleaning this up
in the next cycle or two as it's been on my TODO list for a while anyway.

> 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.