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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" Subject: Re: [PATCH v3 34/40] mm: eliminate VMA_SPECIAL_FLAGS usage when hugetlb explicitly tested Cc: , , , , , , , , , , , , , , , , , , , , , , , 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-v3-34-4583d8a23bca@kernel.org> In-Reply-To: <20260917-b4-mmap-prepare-vma-flag-sanify-v3-34-4583d8a23bca@kernel.org> X-ClientProxiedBy: YQBPR0101CA0280.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:68::29) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|PH0PR12MB7930:EE_ X-MS-Office365-Filtering-Correlation-Id: 8eb26b6e-b031-4302-30e5-08df1e9c6b25 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|366016|1800799024|7416014|376014|921020|4143699003|10067099003|56012099006|11063799006|22082099003|18002099003; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Thu Sep 17, 2026 at 12:22 PM EDT, Lorenzo Stoakes (ARM) wrote: > It is now an invariant that VMA_IO_BIT is not set except by kernel-owned > mappings, so each existing VMA_SPECIAL_FLAGS test need only test for > VMA_DONTEXPAND_BIT, VMA_PFNMAP_BIT and VMA_MIXEDMAP_BIT. > > This is precisely a test for a kernel-owned or fixed mapping. > > Update a number of callsites which already explicitly handle hugetlb > mappings. > > vma_supports_mlock() and ksm_compatible() also explicitly bail on droppable > mappings - detecting kernel-owned, fixed or droppable mappings is handled > by vma_is_persistent(), so in these cases use this predicate. > > should_skip_vma() tests for locked, kernel-owned or fixed memory (having > already excluded hugetlb mappings) so simply test for those there. > > No functional change intended. > > Signed-off-by: Lorenzo Stoakes (ARM) > --- > mm/internal.h | 4 +--- > mm/ksm.c | 4 +--- > mm/vmscan.c | 3 ++- > 3 files changed, 4 insertions(+), 7 deletions(-) > > diff --git a/mm/vmscan.c b/mm/vmscan.c > index 12ed3388ee41..09ff20c3df5b 100644 > --- a/mm/vmscan.c > +++ b/mm/vmscan.c > @@ -3477,7 +3477,8 @@ static int should_skip_vma(unsigned long start, unsigned long end, struct mm_wal > if (!vma_has_recency(vma)) > return true; > > - if (vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) > + if (vma_test(vma, VMA_LOCKED_BIT) || vma_is_kernel_owned(vma) || At this point, mmap_lock is held, there is no mlock WIP, so VMA_LOCKED_BIT is enough. > + vma_is_fixed_mapping(vma)) > return true; > > if (vma == get_gate_vma(vma->vm_mm)) LGTM. Reviewed-by: Zi Yan -- Best Regards, Yan, Zi _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv