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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) Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|IA4PR12MB9835:EE_ X-MS-Office365-Filtering-Correlation-Id: 2f6be638-2fff-4211-ba76-08df1fcf81f1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|23010399003|366016|921020|4143699003|5023799004|11063799006|56012099006|10067099003|22082099003|18002099003; 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> + > + 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. 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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_ X-MS-Office365-Filtering-Correlation-Id: 2f6be638-2fff-4211-ba76-08df1fcf81f1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|23010399003|366016|921020|4143699003|5023799004|11063799006|56012099006|10067099003|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: > 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 = > + 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 = vma->flags; > > return 0; Otherwise, 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 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C12E9CA5FD2 for ; Thu, 1 Oct 2026 15:20:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:In-Reply-To:References: From:To:Cc:Subject:Message-Id:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=IFs864xjM6skA+KWiIDkvnsYlrP8rreNN90innsBBZ4=; b=HEFk2plfjMBnZx aNT/k65vR+hCaySUKeisUdiXRr2IrOyHz7nEYzaAHZy8kZeMzUYje8mMGALVzISb8K435wtGs7LHp Hw8gWwLEJ+d7Zi8zwKSLkwGP57y7Df8R5ffOgECV1yqGpbJhrMM+lAKy2Ua4eviKDjqsthZZ6S8kL ypSs1cUC+IV23z2g0C65yx4ulB6m7ifjfzFQ8XcR8zi/2NDRYPpbX5udn/4NpFv/A67O/BztUu6uB CKnuPTLxcSm3jTbGYp33EZO+rO8AR/qEF/aMgq8N3fhOyWVALWPVarTuQ+u/eD9+JU3Jdn22deLiY vXEiFOijHoOsKGTUzoOA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xCIaO-00000009VWl-1MpU; Thu, 01 Oct 2026 15:20:40 +0000 Received: from mail-southcentralusazlp170120001.outbound.protection.outlook.com ([2a01:111:f403:c10d::1] helo=SN4PR2101CU001.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xCIaK-00000009VS3-0PE4; Thu, 01 Oct 2026 15:20:38 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=Mft82P24ROJQJ7BRJZ/lx47/m2yH8qJcgQD+Yg31FeHE3tSga1ahqlpS5ZGVJphqHX27LlNTQV6mQzbZuS+8zNUb/m5aGqGbmYhkpN7ppCiln5e/cDmm2Xc6N9qTdk5Ke9aZ1EydrfqY4u4rJaGwXxfo7Bgbb3DpH7hihkMCWC2U7s3X3Clunhb3PeEZjaGMhF9bJC8HgKhH3G0p2L6arwKfGoGfdWM49ycWM9tl0ku+UM3haGJ+vAVKt6JnpHAzdsHlc16u0DcVHUP0bcy+qMHWebBslNlcVAiEYOEKnkvFWghD8pKAWp3dnFctmSo+tE+ANcBC+mMMu4jf4E/qYA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=3YYTZjhEwZJ0TssF+378TwKS+eN8c2aSblt03yjYGts=; b=N6gH5bPztY3IR2R1irbhNu8Y072VuOKTk8zViJ00l+ebyjRq5wLzdWPjl9mXGwv9clVmv9MQFFm3MmBb8ONskDM9OQnjhKyFeVdcuCoGERCtrhmIMM4QAMhX3pS6eDWGcHWw4phF45IUjCFaVos4jL0jgihq+Q+mKadbyUMavnv8hx8hOoW2/rb0bQY78nAs4EWhGKgrBrm1MfOQER9BL4zmnEb96MmEMSArOHID2D7tSlab4SGtQ413KeeOoqgysI9loBIgJeAqrsOEJCBqmbruJLM8ZxxfR2vdyUZmW066kKLYCuCOVSJY6qXFcsgRG0xxyVQD5XWGWdid7djwiA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=3YYTZjhEwZJ0TssF+378TwKS+eN8c2aSblt03yjYGts=; b=Fl3LHCQBWqKJbFnXWWWxejTowVjxnRbMRIwV1h1qPj1y83DQU6+iy9gATfEhSBNX18H/62tA46KkomoiXmmnp26MvoeQPcF6dxQyUn4ohLzj3gNlUmWLdHayYFIAhjTVIL9SCqx6iMPqefsIHms+t7QMzzLmQmbraQTUSJmrKvhFn4pTkLn1puMeEGP2Bvki+V3LtuYLeXYgYW0bNHYKa/qQqEKo435R7sO4UhfOWWDP+YwsX0uMLQb/lB+GANvD/cG2ufmt664tW0lHfuTEP3cZs71ZKU0SXPmCOUrGueTt4MSZ3A0WzixNbRZELmngA487Mi1/WR8oRFcYKc8kNQ== Authentication-Results: mx.microsoft.com 1; dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) by IA4PR12MB9835.namprd12.prod.outlook.com (2603:10b6:208:54f::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.451.25; Thu, 1 Oct 2026 15:20:21 +0000 Received: from IA0PR12MB8374.namprd12.prod.outlook.com ([fe80::d85f:4c87:ae84:3f16]) by IA0PR12MB8374.namprd12.prod.outlook.com ([fe80::d85f:4c87:ae84:3f16%6]) with mapi id 15.21.0472.016; Thu, 1 Oct 2026 15:20:21 +0000 Date: Thu, 01 Oct 2026 11:20:17 -0400 Message-Id: Subject: Re: [PATCH v3 23/40] mm/mlock: clear VMA_LOCKED_MASK over mmap callback Cc: , , , , , , , , , , , , , , , , , , , , , , , To: "Lorenzo Stoakes (ARM)" , "Andrew Morton" , "Liam R. 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_ X-MS-Office365-Filtering-Correlation-Id: 2f6be638-2fff-4211-ba76-08df1fcf81f1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|23010399003|366016|921020|4143699003|5023799004|11063799006|56012099006|10067099003|22082099003|18002099003; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kvm-riscv" Errors-To: kvm-riscv-bounces+kvm-riscv=archiver.kernel.org@lists.infradead.org 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 = > + 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 = vma->flags; > > return 0; Otherwise, LGTM. Reviewed-by: Zi Yan -- Best Regards, Yan, Zi -- kvm-riscv mailing list kvm-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kvm-riscv