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Howlett" , "Mike Rapoport" , "Yu Zhao" From: "Zi Yan" Subject: Re: [PATCH] mm/page_alloc: free allocated PFNs if the range does not match X-Mailer: aerc 0.21.0 References: <20260629-free-pfn-on-alloc-contig-range-error-path-v1-1-496ff9ca22db@nvidia.com> <4549ad0e-abb1-4156-95c6-5e3c1319dffe@kernel.org> <9210ef86-3131-464b-93e7-336420d894d9@kernel.org> In-Reply-To: <9210ef86-3131-464b-93e7-336420d894d9@kernel.org> X-ClientProxiedBy: MN2PR08CA0027.namprd08.prod.outlook.com (2603:10b6:208:239::32) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|SN7PR12MB7250:EE_ X-MS-Office365-Filtering-Correlation-Id: 2494136a-4171-4942-6470-08dede9576d5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|7416014|376014|366016|1800799024|921020|22082099003|18002099003|6133799003|11063799006|56012099006|4143699003; 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Anyway. >>>> >>> >>> If someone would run into the WARN we would already be in Fixes: territ= ory. >>> >>> it's a path that should never be executed. If it does, the real issue m= ust be fixed. >>> >>> So (a) I don't think this is stable material (b) I am skeptical that th= is is >>> even a Fixes and (c) I am wondering whether we should touch this *at al= l*. >>> >>> :) >>=20 >> I looked at the code again and agree with you that the code is not >> reachable and the fix should not be in the WARN path. Theoretically, if >> order =3D ilog2(end - start) is smaller than MAX_PAGE_ORDER, >> find_large_buddy() can return an outer_start smaller than start, leading >> to this WARN path. But currently alloc_contig_frozen_range() with >> __GFP_COMP is used by gigantic hugetlb, thus that is not possible. >>=20 >> How about >> 1. making sure order is bigger or equal to MAX_PAGE_ORDER, > > Makes sense. As you say, hugetlb doesn't need something smaller. > >> 2. adding a comment in the WARN path to prevent someone else trying to >> fix WARN path if Sashiko reports this again > > > Agreed. Thanks for the confirmation. I will submit a new version following these ideas. --=20 Best Regards, Yan, Zi