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Howlett" , "Vlastimil Babka" , "Jann Horn" , "Pedro Falcato" , "David Hildenbrand" , "Mike Rapoport" , "Suren Baghdasaryan" , "Michal Hocko" , "Jonathan Corbet" , "Greg Kroah-Hartman" , "Dennis Dalessandro" , "Jason Gunthorpe" , "Leon Romanovsky" , "Paul Moore" , "Stephen Smalley" , "Jaroslav Kysela" , "Takashi Iwai" , "Alexei Starovoitov" , "Daniel Borkmann" , "Andrii Nakryiko" , "Eduard Zingerman" , "Kumar Kartikeya Dwivedi" , "Baolin Wang" , "Nico Pache" , "Ryan Roberts" , "Dev Jain" , "Barry Song" , "Lance Yang" , "Usama Arif" , "Kiryl Shutsemau" , "Doug Gilbert" , "James E.J. Bottomley" , "Martin K. 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Miller" , "Andreas Larsson" , "Alexander Viro" , "Christian Brauner" , "Matthew Brost" , "Joshua Hahn" , "Rakie Kim" , "Byungchul Park" , "Gregory Price" , "Ying Huang" , "Alistair Popple" , "Chris Li" , "Kairui Song" , "Kemeng Shi" , "Nhat Pham" , "Baoquan He" , "Youngjun Park" , "Johannes Weiner" , "Qi Zheng" , "Shakeel Butt" , "Axel Rasmussen" , "Yuanchu Xie" , "Wei Xu" , "Chengming Zhou" , "Michal Hocko" , "Miklos Szeredi" , "Xu Xin" From: "Zi Yan" X-Mailer: aerc 0.22.0 References: <20260917-b4-mmap-prepare-vma-flag-sanify-v3-0-4583d8a23bca@kernel.org> <20260917-b4-mmap-prepare-vma-flag-sanify-v3-9-4583d8a23bca@kernel.org> In-Reply-To: <20260917-b4-mmap-prepare-vma-flag-sanify-v3-9-4583d8a23bca@kernel.org> X-ClientProxiedBy: YQBPR0101CA0090.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:4::23) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|LV3PR12MB9353:EE_ 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu Sep 17, 2026 at 12:22 PM EDT, Lorenzo Stoakes (ARM) wrote: > Describe the newly introduced discontiguous kernel page mapping mechanism= , > detailing how to use it sensibly and how the API looks. > > Explicitly detail the various discontiguous actions available and how to > use them. > > Signed-off-by: Lorenzo Stoakes (ARM) > --- > Documentation/filesystems/mmap_prepare.rst | 81 ++++++++++++++++++++++++= ++++++ > 1 file changed, 81 insertions(+) > > +* ``discontig_kernel_map_page()`` - Maps a single page, correctly handli= ng > + compound pages (if the compound page is bigger than the remaining page= s in the > + VMA, then only those pages that fit will be mapped). For a compound pa= ge, the > + head page must be passed. > +* ``discontig_kernel_map_page_range()`` - Map an array of pages of a spe= cified > + size. Note that if the number of pages specified exceeds the VMA size = then an > + error will arise. Why do mapping a compound page and a page range have different behaviors on the bound? Either both do partial mappings or give errors when a given input cannot be mapped as a whole in the VMA. --=20 Best Regards, Yan, Zi