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Re: [PATCH RFC 00/14] Remove PG_private by using page/folio->private checks instead
- To: Zi Yan <ziy@xxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Muchun Song <muchun.song@xxxxxxxxx>, Lorenzo Stoakes <ljs@xxxxxxxxxx>, "Liam R. Howlett" <liam@xxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, Suren Baghdasaryan <surenb@xxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>, Nico Pache <nico.pache@xxxxxxxxx>, Ryan Roberts <ryan.roberts@xxxxxxx>, Dev Jain <dev.jain@xxxxxxx>, Barry Song <baohua@xxxxxxxxxx>, Lance Yang <lance.yang@xxxxxxxxx>, Usama Arif <usama.arif@xxxxxxxxx>, Gregory Price <gourry@xxxxxxxxxx>, Ying Huang <ying.huang@xxxxxxxxxxxxxxxxx>, Alistair Popple <apopple@xxxxxxxxxx>, Johannes Weiner <hannes@xxxxxxxxxxx>, Qi Zheng <qi.zheng@xxxxxxxxx>, Shakeel Butt <shakeel.butt@xxxxxxxxx>, Kairui Song <kasong@xxxxxxxxxxx>
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Mon, 3 Aug 2026 11:07:39 +0200
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- Delivery-date: Mon, 03 Aug 2026 09:07:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 01.08.26 04:13, Zi Yan wrote:
Hi all,
This patchset removes PG_private to make space for upcoming PG_folio
(reserved as __PG_folio) for identifying pages from a folio (more details
in Note below). Instead of checking PG_private, all code is changed to
check page/folio->private != NULL instead.
I'm a little bit worried that page/folio->private is in a union, so today
it could (in theory) be != NULL while PG_private isn't set.
Is it really not possible to enter a path where PG_private is tested while
page/folio->private != NULL due to the union being used otherwise (PG_private
not set)?
Juergen
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