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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C9AC2CA0EFA for ; Fri, 22 Aug 2025 01:16:26 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9F7C5280002; Thu, 21 Aug 2025 21:16:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 9A74C8E0056; Thu, 21 Aug 2025 21:16:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 848FD280002; Thu, 21 Aug 2025 21:16:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 6D2B88E0056 for ; Thu, 21 Aug 2025 21:16:25 -0400 (EDT) Received: from smtpin25.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id C95171181C8 for ; Fri, 22 Aug 2025 01:16:24 +0000 (UTC) X-FDA: 83802627888.25.C0A08D5 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by imf05.hostedemail.com (Postfix) with ESMTP id 51D91100006 for ; Fri, 22 Aug 2025 01:16:21 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2025-04-25 header.b=RZSo1OIz; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=PuIXZg8p; spf=pass (imf05.hostedemail.com: domain of harry.yoo@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=harry.yoo@oracle.com; dmarc=pass (policy=reject) header.from=oracle.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1755825381; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Or3cKyBfIfPIG9eMmCyczIjx3Sok4swIwH/pfnI5n0c=; b=W4Rqu9XGW9yL+057RHJJ8IOEsrGQamiJRnqjlhU8By5FiBEMZOqs1lLwwbt/sxKj2NUicE 5e+uYqJ6yKNgqrVoo+tdyooCiqw4RohANBYJ47Xiy43rIbylqwXAHLbFZDygQj4CKGyXUR mCE0NfCA6qGXzyZx8yxSMka5ji6Y4Tc= ARC-Authentication-Results: i=2; imf05.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2025-04-25 header.b=RZSo1OIz; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=PuIXZg8p; spf=pass (imf05.hostedemail.com: domain of harry.yoo@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=harry.yoo@oracle.com; dmarc=pass (policy=reject) header.from=oracle.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1755825381; a=rsa-sha256; cv=pass; b=Dg2aruUzilQQnK+nXEyaq46hl8NzOJAktPmJSKSuSZPd6E5w58HukmJiAQBi/t4/DBIxtP 1QJMbLvlW7XRecFf9j40rjYZMlFmMapuVFYb6JJJKsM957oQkY21YHAs7dYD9AoAOfrN8O TiJ+IE41XV5EKpe1FEE9vxqQoFxncQo= Received: from pps.filterd (m0333521.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 57M1FYLg016905; Fri, 22 Aug 2025 01:15:39 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-type:date:from:in-reply-to:message-id:mime-version :references:subject:to; s=corp-2025-04-25; bh=Or3cKyBfIfPIG9eMmC yczIjx3Sok4swIwH/pfnI5n0c=; b=RZSo1OIzaEbxYcuUqpQvKe8CHffYRcW4t8 7QhaNb06iZ3wgh6Oi5TbJd5lN19ReX6SsrfBrvGiStP+sZptGR/rfSG72dGIt3sJ bAEjlk38md7uYbt4o3K+QO8Hi/W987zHK6twbOCtcFwqr6EZ8AvNmr/jxOxmiuu+ 41IJW7jg8R7ZTnfXf/oY90TeDGFRkYl/8ZfzdjjZYQk/QBrZ6xHCj+etJOT7I+Za guE5EwKUw2WZd7A/zm52tnsUjtQ1dzjS0JvixvBi/OlIZUBPwvVTMBRbl35z29Hd /S6eLbZ4yg8jh1uYIjJGt7sfAOvx/IATdqLIC7DPJI9C1WLwOElw== Received: from iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta02.appoci.oracle.com [147.154.18.20]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 48n0tscq51-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 22 Aug 2025 01:15:38 +0000 (GMT) Received: from pps.filterd (iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 57M0MgWZ030401; Fri, 22 Aug 2025 01:11:27 GMT Received: from nam12-dm6-obe.outbound.protection.outlook.com (mail-dm6nam12on2046.outbound.protection.outlook.com [40.107.243.46]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 48my3w366n-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 22 Aug 2025 01:11:27 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=xT9pOmMGtQXtOifwaksXm68lFECCIvljHbOd/DM/t2UlNlWzVYOduP+03uw3PfxwR2/xopM8y+dllgbTen1pZDb7bdxF0AtJ5bhvd4ZBqvh3ISrGugC+ZwrzC9SnmEMFQOIR3RdUGk/2bTDc6xDbAMZtNgAWXfhNC01uRwJd8LdXS55KoR5bBZtlPI8rjGoeoWhG/PrEikG8yErigh2cYk1muRV+4Bv7qZnN/oatKprw7cEmM0aO55NOetucBq1AORoTo5ANytQ2YVNi7CnvcMgbgIhGisc4KdFmEBKwLni1PTBsrETnkwCPo0DA1IcoNf+bgO8BWk4H/Ju6UJZkFQ== 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=Or3cKyBfIfPIG9eMmCyczIjx3Sok4swIwH/pfnI5n0c=; b=c6ckbtwD1nY5svYK1BJ24mLfTZeggWHrSjtBxK1yfAWrSs6CxTSAYvjLwUEcv/QiA3DCYdmg8tx8g3PlrUFHEEoRAuRjmYQiinFS3p94Tn6LzxaXVsTo47nSPEcIT2iNT2h5KP+7S+oGihNAbwK+ZrHPH0VNPNQLZgFuJ9wY8vEIOvm8G2lRirHushKigadRU0YC49qHThCxuMLFdfwJlVV7bo7sdzWCSH8H/OSKOakWLXzE+x8yXIJDRDObwT3UclDkxrIjMT6vU9xplYMUk9EwGp0UTXbX0Pua0X1sp2/GNx+Rk0B4klJzeFNUZki6rAt+ReSomUFqR4HPANQ24Q== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Or3cKyBfIfPIG9eMmCyczIjx3Sok4swIwH/pfnI5n0c=; b=PuIXZg8pwkb+i+Vsqp82rnXbr7ta/Fqo71zWhFetcKVgTvQiSfuUNtZFmFOu7/1XuVSKOE+d+EqkQSJUSwtbL+g5rhyRoT2PZSZKESSLdGLdQ/V45cgVvjnnubAXkfvoLNVTb0cfC+rw+l72WHluPz2SCSVguJLf1thuCIgBZm4= Received: from CH3PR10MB7329.namprd10.prod.outlook.com (2603:10b6:610:12c::16) by CH3PR10MB7574.namprd10.prod.outlook.com (2603:10b6:610:180::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9052.14; Fri, 22 Aug 2025 01:11:24 +0000 Received: from CH3PR10MB7329.namprd10.prod.outlook.com ([fe80::f238:6143:104c:da23]) by CH3PR10MB7329.namprd10.prod.outlook.com ([fe80::f238:6143:104c:da23%7]) with mapi id 15.20.9031.024; Fri, 22 Aug 2025 01:11:24 +0000 Date: Fri, 22 Aug 2025 10:11:08 +0900 From: Harry Yoo To: Dave Hansen Cc: Liam.Howlett@oracle.com, akpm@linux-foundation.org, andreyknvl@gmail.com, aneesh.kumar@linux.ibm.com, anshuman.khandual@arm.com, apopple@nvidia.com, ardb@kernel.org, arnd@arndb.de, bp@alien8.de, cl@gentwo.org, dave.hansen@linux.intel.com, david@redhat.com, dennis@kernel.org, dev.jain@arm.com, dvyukov@google.com, glider@google.com, gwan-gyeong.mun@intel.com, hpa@zyccr.com, jane.chu@oracle.com, jgross@suse.de, jhubbard@nvidia.com, joao.m.martins@oracle.com, joro@8bytes.org, kas@kernel.org, kevin.brodsky@arm.com, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, luto@kernel.org, maobibo@loongson.cn, mhocko@suse.com, mingo@redhat.com, osalvador@suse.de, peterx@redhat.com, peterz@infradead.org, rppt@kernel.org, ryabinin.a.a@gmail.com, ryan.roberts@arm.com, stable@vger.kernel.org, surenb@google.com, tglx@linutronix.de, thuth@redhat.com, tj@kernel.org, urezki@gmail.com, vbabka@suse.cz, vincenzo.frascino@arm.com, x86@kernel.org, zhengqi.arch@bytedance.com Subject: Re: [PATCH v2] mm: fix KASAN build error due to p*d_populate_kernel() Message-ID: References: <20250821093542.37844-1-harry.yoo@oracle.com> <20250821115731.137284-1-harry.yoo@oracle.com> <3976ef5d-a959-408a-b538-7feba1f0ab7a@intel.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3976ef5d-a959-408a-b538-7feba1f0ab7a@intel.com> X-ClientProxiedBy: SE2P216CA0048.KORP216.PROD.OUTLOOK.COM (2603:1096:101:115::14) To CH3PR10MB7329.namprd10.prod.outlook.com (2603:10b6:610:12c::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR10MB7329:EE_|CH3PR10MB7574:EE_ X-MS-Office365-Filtering-Correlation-Id: 1835b6b9-67ca-451e-8269-08dde118cfb8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|366016|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?XEtl242d7zGuz8eFf0EJCmFCtphtTyTyFDXexYWqaYflsA1axCn1tb9hepa2?= =?us-ascii?Q?y5wWkUH2O9HgI50TtcIWX8SerA+xcc6LTy/U164vb0YDUKcFnif0n+mwJ6kZ?= =?us-ascii?Q?L4AJXN7XoSkKdRpbPK/80/H4hEbd1CEaHihNmVz9VQ1UCLc/XhUeJCp1IMLZ?= =?us-ascii?Q?I53c3QIOMMV/rnCrGMnytryht6wZAluDMtpq35eEl3DrWLdxfe0NBynMhWWr?= =?us-ascii?Q?lfklgjc9jKuL3RZUqXn3i2YsOW/SJDvSBOHgdLhYlRcM5BB6vBzfmHQuvdWs?= =?us-ascii?Q?w8Q0xmXvrn5jQdCXZLhq4Xr4qpDsiD2i+XdR7qEUHoymOuGXOHJ6feDoCPOj?= =?us-ascii?Q?uOASsiBv82sB/HVtnraw5JRm5m/5/hp2qBW/8YzptkCmsIlF9F6D3yHVx66e?= =?us-ascii?Q?1/XCzFFHPhL7lRIHF5KdStIN/BVcCIo0Q2I/ewk1v+OU01ftciPQ2wjU5IQ5?= =?us-ascii?Q?y5oLixdc4Vdjbmb6bWitogBB+ZyM8YyUyhlz2cn2/0tZmUdWEqEkGck3kFVW?= =?us-ascii?Q?C48uX8uw8F4yNnwtvE2hS/pHnwWADqs+8kaoK0LRy83BYqh8s6HU90wrImzH?= =?us-ascii?Q?8Xa4DHFg4xO7n8IWbTiTJxiqOYea9EzJ52ngge6fFjkvYErgVraFbVspCt/O?= =?us-ascii?Q?FO/xmpHfVntbQxt4o5cvVo3BqCZWx0qVyc2TDT6XcuOgNDj/kdzftWJr3o+K?= =?us-ascii?Q?pio1suWLjmjGneQvPLFsNOsd2jdH59ja32Y8fpksVlXCM+UmkjEIhq82zM4G?= =?us-ascii?Q?p9zPxqq4hQbg7Mp7VeSl4Eo4AqQStk+4oFGWd+l6xhobNntbCKWuqANTQBjr?= =?us-ascii?Q?NWkhHEkISz2RYfUYyyIGXq6cmVIvuNLCUIl7BvEPncp9XjKhpOAsV8vj9KE3?= =?us-ascii?Q?RRMLGJqueILN2C475SsstgQobfMXk/klVvxl/Ah/5UEFPuAasHV2NOD45+NT?= =?us-ascii?Q?zzFTArWr2bF+Fkwd2pzr6ojZRMQlt0IGdHqH4asRFhqwINWKAAv+VdLDrKUU?= =?us-ascii?Q?ZGR2rYBetDfcmB1XVB4HzWEvyqrlQk/74ugV8DzoGr5Dobr6zesKSK3cTJSa?= =?us-ascii?Q?P66JqgJ4ZBEhg1V5FNSysexWn9120uwK3l3KL3tDhwvUy9KdmSO6f4JIFkCj?= =?us-ascii?Q?qg6jRgBAeWiO7eX8WdHcsyHOQ/j93RvTh1qNhEO1xs1ScdZ0Zs7WGRuDlbHe?= =?us-ascii?Q?R5jh6bU+FuzgA1C2B9hR54aXY8VZXVoiZnvy4shFeJoxg13dJbNiFl4E10vJ?= =?us-ascii?Q?W3wWs6pWkP3h0OkHUwpZIfZO7r9EQHz2vKa1ZGS4VXO9RMqxZOYGbzkwD5RL?= =?us-ascii?Q?kSVE0HCg9Yd/6OrRzPLoWIviOaTOIhndL/nf3FVj5LfWrtpvli8Y8Z09B8BQ?= =?us-ascii?Q?NY5hUznsyXd2YAmGLkugU7uqWv75ixCSlBJT4hoLxwyiphMbNmSu5LpU0Gls?= =?us-ascii?Q?3lsxicEyy78=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH3PR10MB7329.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(7416014)(376014)(366016)(1800799024);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?3T6HIHgsjG3Vhdpg+QLpoZxxjy/BNOHgTL20DGDtqm6ra2gQz2YQMQFNDpke?= =?us-ascii?Q?SSGSs1FR+XBHzcHF0UHamYDi53cpCw+lPfIRlNHnJ88DKO1n5Bk5/1e6YsHn?= =?us-ascii?Q?zPfuDgUDI7Cil9QguPVInSu9WKARCnCbq2WefVXfjai3NTg+3grjRgmhNj5o?= =?us-ascii?Q?dlIl0JvKODKih9iBjiM5J+/yiNDTpLE3HmtwNg3qm7cblBbiG3XKwbA9b7By?= =?us-ascii?Q?SSZNT6NOxh94Z3+1HM8FRMo1/pHFwdbor3UbEGh33umEBu3O970fvdRnH0GX?= =?us-ascii?Q?Sr0UAOzqgqUnIMOGjF0WQovfN1McM7cysvww3iVyIGHzkeq5jUMgedBSqnL+?= =?us-ascii?Q?fxwpQ2gQQtrZG4gOADrc61innpllYrsbZ2rSj7LmCXMPsBh1CgV/OMd26pJ/?= =?us-ascii?Q?YWCflKz51wqDoscwfZDRmjRfgP7WjGFT15idqHOErE6Ki1t4il3AAae4sRm6?= =?us-ascii?Q?K+tTP37VN/ln27oXbgxTE5pDDnMuRtgWQe3nHO6mbB9huVYb+jBq/tPUEgJM?= =?us-ascii?Q?kBMUhC9oS3m5b6ih22QD9zdofWwJdUrxjkXKn4AlcwrvJ77F17pzONPVNXxZ?= =?us-ascii?Q?J3WqJ/XEjaKgDFlKtBl/UT+GUwOoLqh4hkqgQL3lgePGMRedGZf0OMEuzDHi?= =?us-ascii?Q?YInOtpqRpP3Gu9J4JKiv3HknpIoYm7SgMylK5ezsezYuAgyvf3JqeNxZ3TDC?= =?us-ascii?Q?jvvTJh7uM/LIR+lSh5AeZgsow6G3xGdhIFBBvcbMsh9X+/FdgQ46xQqE9CdR?= =?us-ascii?Q?xqKb/E0DFwIDZ7IcJuLUiY6MhV445514lwO1eydZtfQkdIjHKktuVpxp8WSD?= =?us-ascii?Q?N+OsLv+LMgazFTRa38UenVAccGxsS3vT0p6Db/cUFHLjev9yvIX0Gr1NHUyh?= =?us-ascii?Q?3sGIH2YryavXLKZeJlIqutVoncG2NlEvWKi6o2xBU7LiyksjcRRYtcqWd67f?= =?us-ascii?Q?koeHThSCfhRZtGXEas/QXGMoVHlgnG+/OhKb76G3QYxRRv15J5U3+RS5rzFS?= =?us-ascii?Q?AOFOMaghFb+olOu5BrUyaD4eUiv1WIovQl7otygeMcPC3XLY0PRTHGw3dFrC?= =?us-ascii?Q?RpMi7kIM8TRsvTep7mnmFM+kFvv8Hs5pj17wjUuZ4m8frOopxGVE3d7pK2Yy?= =?us-ascii?Q?sW+6B4Uwjxn0WzDHTMeZUGw9ut8H8rRnDkiHJyZCPlbqIhAgEqeeTn1X32iI?= =?us-ascii?Q?RJbCp3NXSERGSlzys3O+P+ii+69SXc3FIINjwQwZi5P11rPAAKJZRH2RWcPP?= =?us-ascii?Q?6O3z1nkgSSpJKxefFBi6MGDByMXq5BNrI/l1OBF3Bb0eDRyYtWx+OMX/C1Cg?= =?us-ascii?Q?eCVuYXyYb4e5ChnQVIVCSIqhqXMl9aT/OeAceAhmOPKrlAS8Wc4nujN9LhY2?= =?us-ascii?Q?35vWPSk44TafOa1rBKEKDpWDLCHSORgpLS95YJGIZlAG/ukHiNzoe3oso+Kt?= =?us-ascii?Q?t0NNMflAxTSm16Jk1CuX6rkjs8MVOD4rRnLrN2vJGjMpbWZEc8jKBymBzWO1?= =?us-ascii?Q?LmMKy00dWA/WKXwAWjBDnH/P+lsNdVEu2aEXEaxqdTsvKSC7h9fg0kOcklJZ?= =?us-ascii?Q?BI02kAV/KwpyZZsKypF/fBxkte7wGC95v7GFAUOs?= X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1835b6b9-67ca-451e-8269-08dde118cfb8 X-MS-Exchange-CrossTenant-AuthSource: CH3PR10MB7329.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Aug 2025 01:11:24.1710 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Ms6t9KEWCrnsgRlA9gK4asAvGC9OuIhubeSrmnJSwiqp2CnjvBapWLjhHhebi3yPr8Ns+c9D3+YlE5Gc18VOKg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR10MB7574 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-21_04,2025-08-20_03,2025-03-28_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=0 phishscore=0 mlxscore=0 adultscore=0 mlxlogscore=999 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2508110000 definitions=main-2508220009 X-Proofpoint-GUID: OBwLlpGj2dokzS6y77Gpk7WAnOwBmAFA X-Proofpoint-ORIG-GUID: OBwLlpGj2dokzS6y77Gpk7WAnOwBmAFA X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODE5MDE5NyBTYWx0ZWRfX0W8JL133su4m u2J7ofcHBYhfvrxs5YNtTvCT14x0I8tsOvZ5iY064+MV0qYs+wBNqFRV0LFm6z1BCxbu1jpiZKD uIC/czBlzMVOSl+fuLLyihS8jGkpLq3wnkcOgETMXdj6EwxmikZpAk00ubs5fHrRoupP6Ur8/YX /BuRa86pKLN5sA6h3WTyxWm5MNmi5eBKpwLkAU2lcWAPtx3M9XQ4tnICnBlkTsiksYleJIy9rqR crwvhcvJtVraVRMzpvbt2fIARpOi70kY1cVMdyIKlQyl8zF0QRDP5/nqSttUQCBXNSTnTnDDBbk ZUOrVj99qKBpCdQuwtYM4CRVtykTPzC9d7ceD7MVFTj4pTREtGXi0nOFHeoedwrz5KmGPW4KEaX CWZ/mJeEyj02OXKbLIWxA3ERse/dY1UbjedDgzA440KNROy1Ufw= X-Authority-Analysis: v=2.4 cv=HKOa1otv c=1 sm=1 tr=0 ts=68a7c4ba b=1 cx=c_pps a=e1sVV491RgrpLwSTMOnk8w==:117 a=e1sVV491RgrpLwSTMOnk8w==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10 a=2OwXVqhp2XgA:10 a=GoEa3M9JfhUA:10 a=VwQbUJbxAAAA:8 a=yPCof4ZbAAAA:8 a=c-l3B2UTeUbyIcVUB2sA:9 a=CjuIK1q_8ugA:10 cc=ntf awl=host:13600 X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 51D91100006 X-Stat-Signature: 9ag9pzoui16sxgehga36nwj95ymdmc44 X-Rspam-User: X-HE-Tag: 1755825381-166434 X-HE-Meta: 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 7BvByYfl 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Aug 21, 2025 at 10:36:12AM -0700, Dave Hansen wrote: > On 8/21/25 04:57, Harry Yoo wrote: > > However, {pgd,p4d}_populate_kernel() is defined as a function regardless > > of the number of page table levels, so the compiler may not optimize > > them away. In this case, the following linker error occurs: Hi, thanks for taking a look, Dave! First of all, this is a fix-up patch of a mm-hotfixes patch series that fixes a bug (I should have explained that in the changelog) [1]. [1] https://lore.kernel.org/linux-mm/20250818020206.4517-1-harry.yoo@oracle.com I think we can continue discussing it and perhaps do that as part of a follow-up series, because the current patch series need to be backported to -stable and your suggestion to improve existing code doesn't require -stable backports. Does that sound fine? > This part of the changelog confused me. I think it's focusing on the > wrong thing. > > The code that's triggering this is literally: > > > pgd_populate(&init_mm, pgd, > > lm_alias(kasan_early_shadow_p4d)); > > It sure _looks_ like it's unconditionally referencing the > 'kasan_early_shadow_p4d' symbol. I think it's wrong to hide that with > macro magic and just assume that the macros won't reference it. > > If a symbol isn't being defined, it shouldn't be referenced in C code.:q A fair point, and that's what KASAN code has been doing for years. > The right way to do it is to have an #ifdef in a header that avoids > compiling in the reference to the symbol. You mean defining some wrapper functions for p*d_populate_kernel() in KASAN with different implementations based on ifdeffery? Just to clarify, what should be the exact ifdeffery to cover these cases? #if CONFIG_PGTABLE_LEVELS == 4 and 5, or #ifdef __PAGETABLE_P4D_FOLDED and __PAGETABLE_PUD_FOLDED ? I have no strong opinion on this, let's hear what KASAN folks think. > But just changing the 'static inline' to a #define seems like a fragile > hack to me. At least that's what KASAN has relied on p*d_populate() to do... -- Cheers, Harry / Hyeonggon