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Peter Anvin" , "Andrew Morton" , "Lorenzo Stoakes" , "Liam R. Howlett" , "Vlastimil Babka" , "Mike Rapoport" , "Suren Baghdasaryan" , "Michal Hocko" , "Brendan Jackman" , "Johannes Weiner" , "Alexander Gordeev" , "Gerald Schaefer" , "Heiko Carstens" , "Vasily Gorbik" , "Christian Borntraeger" , "Sven Schnelle" , "Muchun Song" , "Oscar Salvador" From: "Zi Yan" Subject: Re: [PATCH v2 02/10] mm: provide free_reserved_pages(), removing x86 variant X-Mailer: aerc 0.21.0 References: <20260716-bootmem_info_part2-v2-0-4afc76c73d61@kernel.org> <20260716-bootmem_info_part2-v2-2-4afc76c73d61@kernel.org> In-Reply-To: <20260716-bootmem_info_part2-v2-2-4afc76c73d61@kernel.org> X-ClientProxiedBy: MN0PR05CA0011.namprd05.prod.outlook.com (2603:10b6:208:52c::17) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|DS0PR12MB9424:EE_ X-MS-Office365-Filtering-Correlation-Id: 1341bcd9-2a73-42bd-e7bb-08dee37f0862 X-MS-Exchange-SenderADCheck: 1 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 Wqg185N7 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The common-code variant will consume an > order, so adjust the x86 callers accordingly. > > Make free_reserved_pages() assume that we are freeing ordinary > high-order pages, just with the special "reserved" flavor. The target > use case for now is freeing vmemmap PMD pages. > > Set the refcount directly to 0 (instead of 1) and call > __free_frozen_pages(). Set the page count to 0 before clearing > PG_reserved, so someone checking PG_reserved (and not finding it set) > to then try grabbing a ref would not suddenly have that ref be dropped. > That is arguably cleaner and safer than the old way of doing it. > > Add some kerneldoc. Use a single adjust_managed_page_count() call. > > Reviewed-by: Mike Rapoport (Microsoft) > Reviewed-by: Muchun Song > Signed-off-by: David Hildenbrand (Arm) > --- > arch/x86/mm/init_64.c | 8 +------- > include/linux/mm.h | 8 ++++++-- > mm/page_alloc.c | 33 ++++++++++++++++++++++++++------- > 3 files changed, 33 insertions(+), 16 deletions(-) > LGTM. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi