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Mon, 21 Oct 2024 19:57:38 +0000 Received: from BYAPR10MB3366.namprd10.prod.outlook.com ([fe80::baf2:dff1:d471:1c9]) by BYAPR10MB3366.namprd10.prod.outlook.com ([fe80::baf2:dff1:d471:1c9%6]) with mapi id 15.20.8069.024; Mon, 21 Oct 2024 19:57:38 +0000 Date: Mon, 21 Oct 2024 20:57:34 +0100 From: Lorenzo Stoakes To: Vlastimil Babka Cc: Andrew Morton , Suren Baghdasaryan , "Liam R . Howlett" , Matthew Wilcox , "Paul E . McKenney" , Jann Horn , David Hildenbrand , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Muchun Song , Richard Henderson , Ivan Kokshaysky , Matt Turner , Thomas Bogendoerfer , "James E . J . Bottomley" , Helge Deller , Chris Zankel , Max Filippov , Arnd Bergmann , linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-arch@vger.kernel.org, Shuah Khan , Christian Brauner , linux-kselftest@vger.kernel.org, Sidhartha Kumar , Jeff Xu , Christoph Hellwig , linux-api@vger.kernel.org, John Hubbard Subject: Re: [PATCH v2 2/5] mm: add PTE_MARKER_GUARD PTE marker Message-ID: <0dd102ef-ada5-4c26-8836-bf91957ea907@lucifer.local> References: <081837b697a98c7fa5832542b20f603d49e0b557.1729440856.git.lorenzo.stoakes@oracle.com> <9c0991db-9bf8-414c-b3b0-446023df2a7a@suse.cz> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9c0991db-9bf8-414c-b3b0-446023df2a7a@suse.cz> X-ClientProxiedBy: LO4P302CA0023.GBRP302.PROD.OUTLOOK.COM (2603:10a6:600:2c1::15) To BYAPR10MB3366.namprd10.prod.outlook.com (2603:10b6:a03:14f::25) Precedence: bulk X-Mailing-List: linux-api@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR10MB3366:EE_|DS7PR10MB4832:EE_ X-MS-Office365-Filtering-Correlation-Id: a6fc6c78-bdb5-4b5c-85b4-08dcf20a9d0f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|376014|1800799024; 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> > goto out_mutex; > > + } else if (marker & PTE_MARKER_GUARD) { > > + ret = VM_FAULT_SIGSEGV; > > + goto out_mutex; > > Given we don't support hugetlb, should we WARN_ON_ONCE() if such unexpected > marker appears there? Yes agreed, will add. [snip]