Message ID | 78b49fc7e0302be282b4fcbd3f71fa4ae38e2d5f.1725941415.git-series.apopple@nvidia.com (mailing list archive) |
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State | Handled Elsewhere, archived |
Headers | show
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b=hS2ezw8+I+MLJ2F3SgAVUJQTBaY8y53MZtqrZeZxcX2nQo91JgDlnFL86r2bv/BSZz2Uwl3hhaAvoA0BDzXVkErE/Vw8Lsozm92KvTHu3byfQBs621gdxv3yBLCXfwPp41dspzVRXac1XfJjVuFbfQmNf9nooGYtIqdSmZqnMBx3b2+xXobjxNCfspvjdPMflapjdL3HASWIn0g32EKbpwvVU8UwJhIqUSVUrAlsAUv0C1pTtXVAuzbu5hp8bPSRNxZJkZ7BB+/PyN9lgFUPkyEMRvhHod1R9/P+SXZSKfZiNMMUMFT+ELQ/eZldE/0U6RLNXucHlTK8XP2/D+GqrA== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from DS0PR12MB7726.namprd12.prod.outlook.com (2603:10b6:8:130::6) by IA0PR12MB8088.namprd12.prod.outlook.com (2603:10b6:208:409::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7918.27; Tue, 10 Sep 2024 04:15:36 +0000 Received: from DS0PR12MB7726.namprd12.prod.outlook.com ([fe80::953f:2f80:90c5:67fe]) by DS0PR12MB7726.namprd12.prod.outlook.com ([fe80::953f:2f80:90c5:67fe%3]) with mapi id 15.20.7918.024; Tue, 10 Sep 2024 04:15:36 +0000 From: Alistair Popple <apopple@nvidia.com> To: dan.j.williams@intel.com, linux-mm@kvack.org Cc: Alistair Popple <apopple@nvidia.com>, vishal.l.verma@intel.com, dave.jiang@intel.com, logang@deltatee.com, bhelgaas@google.com, jack@suse.cz, jgg@ziepe.ca, catalin.marinas@arm.com, will@kernel.org, mpe@ellerman.id.au, npiggin@gmail.com, dave.hansen@linux.intel.com, ira.weiny@intel.com, willy@infradead.org, djwong@kernel.org, tytso@mit.edu, linmiaohe@huawei.com, david@redhat.com, peterx@redhat.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, david@fromorbit.com Subject: [PATCH 08/12] gup: Don't allow FOLL_LONGTERM pinning of FS DAX pages Date: Tue, 10 Sep 2024 14:14:33 +1000 Message-ID: <78b49fc7e0302be282b4fcbd3f71fa4ae38e2d5f.1725941415.git-series.apopple@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <cover.9f0e45d52f5cff58807831b6b867084d0b14b61c.1725941415.git-series.apopple@nvidia.com> References: <cover.9f0e45d52f5cff58807831b6b867084d0b14b61c.1725941415.git-series.apopple@nvidia.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SY5P282CA0110.AUSP282.PROD.OUTLOOK.COM (2603:10c6:10:20b::15) To DS0PR12MB7726.namprd12.prod.outlook.com (2603:10b6:8:130::6) X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: <linuxppc-dev.lists.ozlabs.org> List-Help: <mailto:linuxppc-dev+help@lists.ozlabs.org> List-Post: <mailto:linuxppc-dev@lists.ozlabs.org> List-Subscribe: <mailto:linuxppc-dev+subscribe@lists.ozlabs.org>, <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>, <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org> List-Unsubscribe: <mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org> MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR12MB7726:EE_|IA0PR12MB8088:EE_ X-MS-Office365-Filtering-Correlation-Id: 2d92a199-4c00-4b0d-b7c4-08dcd14f385b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|366016; 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Series |
fs/dax: Fix FS DAX page reference counts
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expand
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diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 14273e6..6a1406a 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -187,6 +187,17 @@ static inline bool folio_is_device_coherent(const struct folio *folio) return is_device_coherent_page(&folio->page); } +static inline bool is_device_dax_page(const struct page *page) +{ + return is_zone_device_page(page) && + page_dev_pagemap(page)->type == MEMORY_DEVICE_FS_DAX; +} + +static inline bool folio_is_device_dax(const struct folio *folio) +{ + return is_device_dax_page(&folio->page); +} + #ifdef CONFIG_ZONE_DEVICE void zone_device_page_init(struct page *page); void *memremap_pages(struct dev_pagemap *pgmap, int nid); diff --git a/include/linux/mm.h b/include/linux/mm.h index ae6d713..935e493 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1989,6 +1989,10 @@ static inline bool folio_is_longterm_pinnable(struct folio *folio) if (folio_is_device_coherent(folio)) return false; + /* DAX must also always allow eviction. */ + if (folio_is_device_dax(folio)) + return false; + /* Otherwise, non-movable zone folios can be pinned. */ return !folio_is_zone_movable(folio);
Longterm pinning of FS DAX pages should already be disallowed by various pXX_devmap checks. However a future change will cause these checks to be invalid for FS DAX pages so make folio_is_longterm_pinnable() return false for FS DAX pages. Signed-off-by: Alistair Popple <apopple@nvidia.com> --- include/linux/memremap.h | 11 +++++++++++ include/linux/mm.h | 4 ++++ 2 files changed, 15 insertions(+)