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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. Petersen" , "Jaya Kumar" , "Simona Vetter" , "Helge Deller" , "Sebastian Reichel" , "John Hubbard" , "Peter Xu" , "Masami Hiramatsu" , "Oleg Nesterov" , "Peter Zijlstra" , "Thomas Gleixner" , "Ingo Molnar" , "Borislav Petkov" , "Dave Hansen" , , "Arnaldo Carvalho de Melo" , "Namhyung Kim" , "Mark Rutland" , "Rik van Riel" , "Harry Yoo" , "Juri Lelli" , "Vincent Guittot" , "Maarten Lankhorst" , "Maxime Ripard" , "Thomas Zimmermann" , "David Airlie" , "Will Deacon" , "Aneesh Kumar K.V" , "Nick Piggin" , "Arnd Bergmann" , "Muchun Song" , "Oscar Salvador" , "Matthew Wilcox (Oracle)" , "Jan Kara" , "Marc Zyngier" , "Oliver Upton" , "Catalin Marinas" , "Madhavan Srinivasan" , "Anup Patel" , "Paul Walmsley" , "Palmer Dabbelt" , "Albert Ou" , "Christian Borntraeger" , "Janosch Frank" , "Claudio Imbrenda" , "Alexander Gordeev" , "Gerald Schaefer" , "Heiko Carstens" , "Vasily Gorbik" , "David S. 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-v3-23-4583d8a23bca@kernel.org> In-Reply-To: <20260917-b4-mmap-prepare-vma-flag-sanify-v3-23-4583d8a23bca@kernel.org> X-ClientProxiedBy: MN0PR02CA0013.namprd02.prod.outlook.com (2603:10b6:208:530::27) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|IA4PR12MB9835: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: > Currently there's a confusing mess around VMA_LOCKED_BIT and > VMA_LOCKONFAULT_BIT. > > It is permitted for drivers to set any flags they like, with the VMA > already possessing lock flags. > > This results in the absurd situation of a VMA possessing both > VMA_SPECIAL_FLAGS and VMA_LOCKED_MASK flags, which is not permitted. > > This has resulted in mlock_vma_folio() having a very silly check for this > scenario to work around it. > > There is no need for this - just clear the flags before invoking the hook > and reinstate them afterwards if they are required. > > Nothing relies upon this being set during the mmap operation. > > mmap_prepare is unaffected by this so requires no fix. > > Signed-off-by: Lorenzo Stoakes (ARM) > --- > mm/internal.h | 9 +-------- > mm/vma.c | 14 ++++++++++++++ > 2 files changed, 15 insertions(+), 8 deletions(-) > > + /* If VMA flags still valid for locked mask, reinstate. */ > + if (vma_supports_mlock(vma)) { > + const vma_flags_t mask =3D > + vma_flags_and_mask(&map->vma_flags, > + VMA_LOCKED_MASK); > + > + vma_set_flags_mask(vma, mask); It took me a while to figure out vma_set_flags_mask() is an OR operation. > + } > + > map->vma_flags =3D vma->flags; > =20 > return 0; Otherwise, LGTM. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi