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Tue, 31 May 2022 10:56:42 -0500 From: Alex Sierra To: CC: , , , , , , , , , , , , Subject: [PATCH v4 04/13] mm: remove the vma check in migrate_vma_setup() Date: Tue, 31 May 2022 10:56:20 -0500 Message-ID: <20220531155629.20057-5-alex.sierra@amd.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220531155629.20057-1-alex.sierra@amd.com> References: <20220531155629.20057-1-alex.sierra@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: ee4dc4e2-bd44-4192-3c80-08da431e2941 X-MS-TrafficTypeDiagnostic: BYAPR12MB2872:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230001)(4636009)(36840700001)(46966006)(40470700004)(7416002)(5660300002)(44832011)(8936002)(508600001)(7696005)(86362001)(40460700003)(26005)(6666004)(2906002)(81166007)(36860700001)(356005)(2616005)(82310400005)(47076005)(426003)(336012)(16526019)(186003)(1076003)(83380400001)(4326008)(8676002)(6916009)(54906003)(36756003)(316002)(70586007)(70206006)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 May 2022 15:56:44.5942 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ee4dc4e2-bd44-4192-3c80-08da431e2941 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT043.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR12MB2872 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org From: Alistair Popple migrate_vma_setup() checks that a valid vma is passed so that the page tables can be walked to find the pfns associated with a given address range. However in some cases the pfns are already known, such as when migrating device coherent pages during pin_user_pages() meaning a valid vma isn't required. Signed-off-by: Alistair Popple Acked-by: Felix Kuehling Signed-off-by: Christoph Hellwig --- mm/migrate_device.c | 34 +++++++++++++++++----------------- 1 file changed, 17 insertions(+), 17 deletions(-) diff --git a/mm/migrate_device.c b/mm/migrate_device.c index 18bc6483f63a..cf9668376c5a 100644 --- a/mm/migrate_device.c +++ b/mm/migrate_device.c @@ -486,24 +486,24 @@ int migrate_vma_setup(struct migrate_vma *args) args->start &= PAGE_MASK; args->end &= PAGE_MASK; - if (!args->vma || is_vm_hugetlb_page(args->vma) || - (args->vma->vm_flags & VM_SPECIAL) || vma_is_dax(args->vma)) - return -EINVAL; - if (nr_pages <= 0) - return -EINVAL; - if (args->start < args->vma->vm_start || - args->start >= args->vma->vm_end) - return -EINVAL; - if (args->end <= args->vma->vm_start || args->end > args->vma->vm_end) - return -EINVAL; if (!args->src || !args->dst) return -EINVAL; - - memset(args->src, 0, sizeof(*args->src) * nr_pages); - args->cpages = 0; - args->npages = 0; - - migrate_vma_collect(args); + if (args->vma) { + if (is_vm_hugetlb_page(args->vma) || + (args->vma->vm_flags & VM_SPECIAL) || vma_is_dax(args->vma)) + return -EINVAL; + if (args->start < args->vma->vm_start || + args->start >= args->vma->vm_end) + return -EINVAL; + if (args->end <= args->vma->vm_start || + args->end > args->vma->vm_end) + return -EINVAL; + memset(args->src, 0, sizeof(*args->src) * nr_pages); + args->cpages = 0; + args->npages = 0; + + migrate_vma_collect(args); + } if (args->cpages) migrate_vma_unmap(args); @@ -685,7 +685,7 @@ void migrate_vma_pages(struct migrate_vma *migrate) continue; } - if (!page) { + if (!page && migrate->vma) { if (!(migrate->src[i] & MIGRATE_PFN_MIGRATE)) continue; if (!notified) {