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"Andrew Morton" , "David Hildenbrand" From: "Zi Yan" Subject: Re: [PATCH] mm/migrate_device: fix cache flush when replacing huge zero PMD Cc: "Matthew Brost" , "Joshua Hahn" , "Rakie Kim" , "Byungchul Park" , "Gregory Price" , "Ying Huang" , "Alistair Popple" , "Balbir Singh" , , X-Mailer: aerc 0.21.0 References: <20260817060845.377800-2-sh_def@163.com> In-Reply-To: <20260817060845.377800-2-sh_def@163.com> X-ClientProxiedBy: YQBPR0101CA0088.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:4::21) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|CH1PR12MB9718:EE_ X-MS-Office365-Filtering-Correlation-Id: 557adab8-5f69-431e-6abe-08defc7e2dff X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|366016|376014|1800799024|7416014|56012099006|10067099003|11063799006|18002099003|22082099003; X-Microsoft-Antispam-Message-Info: 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Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 557adab8-5f69-431e-6abe-08defc7e2dff X-MS-Exchange-CrossTenant-AuthSource: IA0PR12MB8374.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Aug 2026 16:40:00.2081 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Gy5rVcMhc1JejjwR70cSf8Xq14h08jYqctCNnGj+BcZlHN/ejBa6sJIup2awHUDu X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH1PR12MB9718 X-Rspam-User: X-Rspamd-Queue-Id: 5097B4000B X-Rspamd-Server: rspam07 X-Stat-Signature: 7g3b46x4oejzjf6p9fzh7jny9qf8kn9u X-HE-Tag: 1786984810-313186 X-HE-Meta: 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon Aug 17, 2026 at 2:08 AM EDT, Hui Su wrote: > migrate_vma_insert_huge_pmd_page() calls flush_cache_page() before > replacing an existing huge zero PMD. However, the third argument to > flush_cache_page() is a PFN, while addr + HPAGE_PMD_SIZE is an end > virtual address. > > More importantly, the mapping being invalidated is PMD-sized rather > than PAGE_SIZE-sized. Flush the whole PMD range with > flush_cache_range(), matching other huge PMD invalidation paths. > > Fixes: a30b48bf1b24 ("mm/migrate_device: implement THP migration of zone = device pages") > Signed-off-by: Hui Su > --- > mm/migrate_device.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > Thank you for fixing it. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi