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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-v3-2-4583d8a23bca@kernel.org> In-Reply-To: <20260917-b4-mmap-prepare-vma-flag-sanify-v3-2-4583d8a23bca@kernel.org> X-ClientProxiedBy: BLAPR03CA0101.namprd03.prod.outlook.com (2603:10b6:208:32a::16) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|SA1PR12MB6996: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: > It only makes sense to manipulate VMA fields if we allocated a new VMA, > rather than merged it. > > VMA merging does not compare vm_ops or vm_private_data, so a merged VMA > keeps its own, which is also what the legacy f_op->mmap path does since i= t > never touches an existing VMA. Previously set_vma_user_defined_fields() > overwrote the merged VMA's fields with those set for the new mapping. In > practice these are the same values, with rare exceptions such as shmem > selecting vm_ops based on whether the file has been unlinked, so no > user-visible change is expected. > > Make this dependency explicit, and additionally constify have_mmap_prepar= e > while we're here. > > Signed-off-by: Lorenzo Stoakes (ARM) > --- > mm/vma.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > Makse sense. Acked-by: Zi Yan --=20 Best Regards, Yan, Zi