linux-kernel - Re: [PATCH v4 1/7] mm/zone_device: Add order argument to folio

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Message-ID: <20260112235414.GO745888@ziepe.ca>
Date: Mon, 12 Jan 2026 19:54:14 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Alistair Popple <apopple@...dia.com>
Cc: Matthew Brost <matthew.brost@...el.com>, Zi Yan <ziy@...dia.com>,
	Matthew Wilcox <willy@...radead.org>,
	Balbir Singh <balbirs@...dia.com>,
	Francois Dugast <francois.dugast@...el.com>,
	intel-xe@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	Madhavan 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>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Logan Gunthorpe <logang@...tatee.com>,
	David Hildenbrand <david@...nel.org>,
	Oscar Salvador <osalvador@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
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	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>, linuxppc-dev@...ts.ozlabs.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	amd-gfx@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
	linux-pci@...r.kernel.org, linux-mm@...ck.org,
	linux-cxl@...r.kernel.org
Subject: Re: [PATCH v4 1/7] mm/zone_device: Add order argument to folio_free
 callback

On Tue, Jan 13, 2026 at 10:44:27AM +1100, Alistair Popple wrote:

> Also drivers may have different strategies than just resetting everything back
> to small pages. For example the may choose to only ever allocate large folios
> making the whole clearing/resetting of folio fields superfluous.

+1

Jason