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]) by smtp.lore.kernel.org (Postfix) with ESMTP id B5F5EC36018 for ; Wed, 2 Apr 2025 11:40:18 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 93EEF28000A; Wed, 2 Apr 2025 07:40:16 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8ED58280001; Wed, 2 Apr 2025 07:40:16 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 65BB928000C; Wed, 2 Apr 2025 07:40:16 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 31AC728000A for ; Wed, 2 Apr 2025 07:40:16 -0400 (EDT) Received: from smtpin01.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id BB433141711 for ; Wed, 2 Apr 2025 11:40:16 +0000 (UTC) X-FDA: 83288910432.01.35F76D5 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by imf08.hostedemail.com (Postfix) with ESMTP id 6CE3A16000C for ; Wed, 2 Apr 2025 11:40:13 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2023-11-20 header.b=g5IuNkMX; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=R45xRt8q; spf=pass (imf08.hostedemail.com: domain of lorenzo.stoakes@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=lorenzo.stoakes@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=1743594013; 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=k/5cNBDdH8khqcJ3bZEfAKsgaxSj7KFP3YSKkwJNnSs=; b=pf5xzGz8ZW70rZXGkW8HIl7I9bj80a7t8AF4SHDWvkD7LLsm1cvjUwF7AJikh5uQPq0NVC /yE/GecFCe4CUKNOkC08Kd12ykuzZfnHW2nh4Mmbu+ip4CMZGLtDQt544860ks1IojH7ir 5YGGURWhuilj3ikxSiOrt4aRJAN285o= ARC-Authentication-Results: i=2; imf08.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2023-11-20 header.b=g5IuNkMX; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=R45xRt8q; spf=pass (imf08.hostedemail.com: domain of lorenzo.stoakes@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=lorenzo.stoakes@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=1743594013; a=rsa-sha256; cv=pass; b=b7xgBajhZ03qGbCNAYYW13wOADzvUBiYRKn4zC7y3/ZSLVA1er5Zv8NZv81j+wSviV/4Lk Ye3Kh5QILgxAn3SuaG7oLit+Ks7sFzJCRI/s19Bi5QzW+2luJb1CHIucxgr1U2O3EEtMGQ UHg4MEekTzTRI8G5GySgmnUNJBOj24o= Received: from pps.filterd (m0246617.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 5326gIc7013589; Wed, 2 Apr 2025 11:40:09 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-2023-11-20; bh=k/5cNBDdH8khqcJ3bZ EfAKsgaxSj7KFP3YSKkwJNnSs=; b=g5IuNkMXhNgltussSgvTyUxSkxsS52mca9 jNZnoPTF4jj2+dYPukYmBtYZ0bnoxtz9P430PAQLlL+2Aa2CQjBZYRcXGLqX1C69 C9d3JaZL26cibTT9o9u0f/F+sFXXVYojfrUEhfv/JDXHaLyU0Nx5jRaRjXVdqGPz EK8AgjYyQ8aeLQ90iiv7acqU4Jewi3E8GldcculKz30gSC3mBZlsnzwUMIYHbW5Q HePGbuhrVhdlGcgVN+108yZaL8SSHf/x8a3ECuPl6l8K90kqaXHd1y0gYrUjLaXu W5Qt26XExleRyQN8oYHIZyWNk3vA/ii2z5yPDdbg9fplIJlDHU+w== Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.appoci.oracle.com [147.154.114.232]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 45p9dtj627-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 02 Apr 2025 11:40:08 +0000 (GMT) Received: from pps.filterd (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 532AXPXi003357; Wed, 2 Apr 2025 11:40:08 GMT Received: from nam11-bn8-obe.outbound.protection.outlook.com (mail-bn8nam11lp2170.outbound.protection.outlook.com [104.47.58.170]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 45p7aag771-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 02 Apr 2025 11:40:08 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=EHHmWQJtBa1cBS0/MUMJNftGR9dxNGDyoXz3UNxr7rf2uOmJnw/WTno7lYtpnUGdM4ng1qmxV6sQIaKTCov/naQI86g5hw2p84sSpjsLsD2rg6jqE/AZRrU1fI5MCkZPcblpP1bEWqtw9vYmPtqt0i75d9P6EilMMv1uPfhNBjLSUn8RglQawbUK/TzoGrB9ceyOt6xMi/40mcg8E3WfT8qOnNJJp23QEns4OcL8t2qbyQn6b/exYLvFu/xl2bnJPQ76c6Jw3uiGePwqP1lPFCHeMX1MfPpXqX0nq4seh6OnYkV1i/4ikTbo7VllE/kNKoJuQmuCwW03qSzEBLrIXw== 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=k/5cNBDdH8khqcJ3bZEfAKsgaxSj7KFP3YSKkwJNnSs=; b=h6oEY/HMosL5uH5KE8uQ1aUz50OyY+VexDtDuYKkkS3k3yedE0UjHsL+jDkFLCcSshveDTH8/XuqCR3robUfyTj4nJhInG25DsE6ljquNPROTEPNVjCdCOPI8AFFa7qPCCeAyl9uXAZm9bBj4lWfhqcclNvYCFYNf+DZvrVW83tPES/hDeH1gMlxFrlBhE8MYm4kSHmOFm/KW1D2PZwqYnHbK+D13gkqIjvjhSHOjWj9N6vCR4I2lC3XjcT8Fdu/XmjNzLJJMbomF5ONTot3iuDs/e2bGq17mIIdx/umVNOpnvM4CS/FUwuAm3tbTCyPyfFoGOQHebLDnrVEZcOXag== 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=k/5cNBDdH8khqcJ3bZEfAKsgaxSj7KFP3YSKkwJNnSs=; b=R45xRt8qhTgqe+PU1PgExt49UOmB4jnL7OksnqIFfW3ZQs2OCLxxPrFRWwsHAAd0tRB24wy+raN0j1Ud2A76RmOSbygEHBAyTG+YKE3cAXGhKq4usb1Mv45NWdo5wCB6/bJCLC6Gj28kmzfTOnPcYjdHraKhvpS8ILxsInx875M= Received: from DM4PR10MB8218.namprd10.prod.outlook.com (2603:10b6:8:1cc::16) by MW4PR10MB6654.namprd10.prod.outlook.com (2603:10b6:303:22f::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8583.39; Wed, 2 Apr 2025 11:40:05 +0000 Received: from DM4PR10MB8218.namprd10.prod.outlook.com ([fe80::2650:55cf:2816:5f2]) by DM4PR10MB8218.namprd10.prod.outlook.com ([fe80::2650:55cf:2816:5f2%7]) with mapi id 15.20.8583.041; Wed, 2 Apr 2025 11:40:05 +0000 Date: Wed, 2 Apr 2025 12:40:02 +0100 From: Lorenzo Stoakes To: David Hildenbrand Cc: kernel test robot , oe-kbuild@lists.linux.dev, Dan Carpenter , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Liam Howlett , x86@kernel.org Subject: Re: [PATCH v3] x86/mm/pat: Fix VM_PAT handling when fork() fails in copy_page_range() Message-ID: <687f1663-2b96-4b95-bdea-5f044c98b34a@lucifer.local> References: <202503270941.IFILyNCX-lkp@intel.com> <9b3b3296-ab21-418b-a0ff-8f5248f9b4ec@lucifer.local> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: LO2P265CA0226.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:b::22) To DM4PR10MB8218.namprd10.prod.outlook.com (2603:10b6:8:1cc::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR10MB8218:EE_|MW4PR10MB6654:EE_ X-MS-Office365-Filtering-Correlation-Id: 40148970-5a8a-46ea-6ed5-08dd71db1ca5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024|7053199007; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?jAIhqMSHAOnlFjttn3AbQQtazv2kE7eYGp/lfXKGw7PyZTd2r0ZBU4aUPh5j?= =?us-ascii?Q?P4idEpgQP9XO6swvftbk4XucA9EkzjXtrVZ5pT1pWxcAWmeHeJV73raUewT+?= =?us-ascii?Q?XzTDQK4VieuMBVdPfQlJK0WO40doKex/2tvI0rYhiK+zmM0gjMrr2rEoJN0U?= =?us-ascii?Q?CEZU8JujGsIw/yeV2wqEfGd5UEmnlbMzfLwZINCGaIOp6WqKR0dxWh35hxE+?= =?us-ascii?Q?ihhW80AWXkL9f6wQaRQMgAymVU/l6jkHoYqtFAoantdabgv325QcaIDQoZ9L?= =?us-ascii?Q?tUyVHzvBIicaQA2qSyiPcJQqgVfqLli3PQIupdPrnrQVktO/31KXZlDSWy2L?= =?us-ascii?Q?U7k1HMgvmD9eZpiINnZxfqEcJJ/wo8VJK8W0SD/FI0yGFtcXV/qj5AvBN05S?= =?us-ascii?Q?Sd1cOWvI6eXckpiFvaP42sZH0VYhbPg0YSbgKEsfLqkOPB8cJ941gC2Gg/6Y?= =?us-ascii?Q?EvAcLPYhsXXa5SYCkiDjTVN/aAKkfM2SczzkFgFs4LE3UkenYX0fp8GufBZ9?= =?us-ascii?Q?7QyJtMfcaaE9BIuKJ5lZjJEtWZj0Hk/dCmre8YomR39Peu8/o+JtyyMOD8Hm?= =?us-ascii?Q?05y7DY0JRU+zYsUsa8K4IYS3ClNvXvSS/2JOiWzRjPMdUZQNnhXzKQ9YwUqy?= =?us-ascii?Q?PgakkyTu7X0DKK2/HMY6B782JqkaitU7CmiEofRYs76GudAzp5jcO7gd/Pcb?= =?us-ascii?Q?V2bDjqR6Tdb9gi+c8iPqK9qc5eCzat4EZwXU9AvEiUOADhG3EqRze+aIhbIP?= =?us-ascii?Q?H6D92JV27IsCSCOG0phE3iKKmZaUucPVmVeQH4FTSUIOU2z82DlarqdN3ciQ?= =?us-ascii?Q?ruJZ6ep0zfq1q8tCWXqEDEM2r9Y3CAOQUK0EgCxK7Vu9XURVS2qiiv0WQSwX?= =?us-ascii?Q?3mOIxiUU7vXErUSLBVHb1/mKUQjex0tC1FOB1bMOJdhcltqtsVD9g69V+V/0?= =?us-ascii?Q?nhD06sPYIs4+7Rj5XlUO49/u2SX+v2W4XVuLwHtIz+xHDq0IIbrp7TBefMNX?= =?us-ascii?Q?UAHEfHUVEEBjpeZ4f1kLRUMzJ6OGl+NR93Wik0q0imNbvgBndkuW3r3c9ZAx?= =?us-ascii?Q?4NxW7YBlP0sylwvSbhCPxbHMul5+RU70hkzLedR4ft3dLSJdZSuAfFJKW2o8?= =?us-ascii?Q?MTMvMlSPfaMtcPfuwgMWn1cC37m+eojO2byqn8AQ0qtLH4ya85gQQ9KUfyxb?= =?us-ascii?Q?sCjYVY+SwoePKpqyC2HTFTrelniASpxjVNIYCRDDZz+wDEJOdGnUcIgPYI7Y?= =?us-ascii?Q?j/ZAXa3L880JtVI+bOH46L+3vdqMOQb70/uN8NjdS4mA4x/rF3hFau/L3QI5?= =?us-ascii?Q?iamshWh1RKvHF2O08ELXRmWQ2ecat+vbPlzbwsGuCqbZYg=3D=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM4PR10MB8218.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(376014)(1800799024)(7053199007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?IUnoBhbzUG9SoBh6frygqta4oAB1mhMLHAqJ7oBjEdvHEz6p7q8tFNgac59L?= =?us-ascii?Q?SpAVLrKg6Rfc6J5fFG+RjrpaMdAvTTe+HR8+OHbFPP44+wHra0MBJcvMXfme?= =?us-ascii?Q?hC1dzRJHTctcvo+Yf427V4TiXLcPobjF17MCDI4oA9Of1F5BqXLVeRgQaqDU?= =?us-ascii?Q?Tzqsyc6qNIEMXkfe9WxWyHZybzqI98LUiRN8TQ0nzn0qWZkHDe+N4BicSFoI?= =?us-ascii?Q?jrhoefUzkNwtC1aXF1UI1T8TIqJQzg/KObXW5A50DbcvmDsQFeB5p3g/UhF8?= =?us-ascii?Q?7xbKO4N3qPj7ljTa1Bk+nhXe+9mu3C0y2/zR9c+dEriCiqvQ6lwpH7bMyZZc?= =?us-ascii?Q?jvFA3wET/OqevyMRAXU7XctaZhXk8xWfkOPye33htheqEuKGpH+Hv1lE/LU3?= =?us-ascii?Q?ZOQxhgMDDwwHBT59bO7gpbmyvVCxCjXw+uxwIb5HTPQodEME4rHpsUjItoQh?= =?us-ascii?Q?mYEth0xmZLEkLfztKnmzrjuhqLf8tXBKuzSAUB0zaUOaFDeS6INZurWnU4ov?= =?us-ascii?Q?gpsAUrnlMhHo3SDMVa5EZn9wbbbi60e1cIRTEBIZ0cZ+Bt/ilqQVrZK7r23s?= =?us-ascii?Q?aeZ9OfLyc2LjTbMjiVdEOzAtCffodEJP3iHwUzLD/vGLhv1fE7b8bom9S5Rp?= =?us-ascii?Q?ERRlGINSk63SRd8myMHPO/BdhFLdqvGlVW/1v2zDY2FEQzFgIgxGkl6BoXc8?= =?us-ascii?Q?lN2eTiMMMlqmuF+sNozZHQmGAWVTH3PHsZH3Yc7EyrNcX+DMuCvmR+n3MA1n?= =?us-ascii?Q?R7voxIwohI0O72Ikta/Xs3kSySFwh5XTmH8ypKInVhAiLohw5ZcIdgdjTwmR?= =?us-ascii?Q?zRJyifse7AnMflviKygwjMuZrkdfIaX3ygb4uEVhWyOqH1aAMpx9Te4PVEFl?= =?us-ascii?Q?IY6V2px5pzI/jbD5YWiP8ykKTLtGe77i1/y72x83WpZYaTMaia9DdJ5lE9gR?= =?us-ascii?Q?VHqOtzjecch+WgPqxdkTFM4yU5/kNmSfbhq/+tw3Kz7oIOBjPrboRp0c27Zu?= =?us-ascii?Q?fjDeQb8VIxuQ1yuZAf9KeH9hXhzAjDjvyreyHc+tINvCaeLuXBsOlgquQC1g?= =?us-ascii?Q?UxOrPMzr4/f4wFqg7oDnAqwbcpe+Z3UsOekVVoO+DSrfR0wx3lClJamq57Z8?= =?us-ascii?Q?00OCgsx+/LkIZ4MGq788FN7QdYjHwrrMIAzD3c0DhROvQuRgTmFAr29q8tML?= =?us-ascii?Q?Vk/gLaQz88tNo6ePpv8ocCXvrLwrVPR7v+dAlrMmZjIrCQ375j9W4THJWY7L?= =?us-ascii?Q?TGFPjFEgHpMt8igIJ+qVHpU8bH1N8zt63on5stBA3J754Fm0+X63j1YsIaeb?= =?us-ascii?Q?OWn0U2Q/sPVei+KsgHSd1aof0eB+rroVcG3hi0+Lpq8mllab992jS1THyilm?= =?us-ascii?Q?q41vcAXgRnMDBuBYBxziy2NJmMHe89wKyafdPfNoCxFXQ8xEVji31cYIcTOn?= =?us-ascii?Q?JMm+xkgpb4s62VLvpc/ojKRNoCUuOyuwIRw9X3mGJePIXruPovH5mxhNkWrP?= =?us-ascii?Q?p4eGRkluOj8tuYNxh+MXgs+NpsvbuswUpGhhM7ctLw7STqEjF9dVZbGMnxzV?= =?us-ascii?Q?D0p4i9mQbC6ROHlrBUNwPhDeMT33d43amqdA+W1+YYHZjysg9EXpxIvNq4Tw?= =?us-ascii?Q?QQ=3D=3D?= 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: 40148970-5a8a-46ea-6ed5-08dd71db1ca5 X-MS-Exchange-CrossTenant-AuthSource: DM4PR10MB8218.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Apr 2025 11:40:05.0541 (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: CsaoDxpwBKZNxOGKglIEOafZ8z7TzcqenY7w3oX0MR6l3Xth6TdO9Vjo89tADftanNvHzrir95APG4rQc0CFvfaP+E9F4zOjZemkYIaVEb4= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR10MB6654 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-04-02_04,2025-04-01_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 adultscore=0 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2502280000 definitions=main-2504020073 X-Proofpoint-ORIG-GUID: 5dZ7foPUzycNApUEn9CI4NU6AN_xCOZD X-Proofpoint-GUID: 5dZ7foPUzycNApUEn9CI4NU6AN_xCOZD X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 6CE3A16000C X-Stat-Signature: k1o8o1hmbh6t5rbymjykstwz6394qrmc X-HE-Tag: 1743594013-918195 X-HE-Meta: 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 W+Hrqrc4 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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: Let me try that again as my mail client went crazy... Actually let me +cc a few more so this isn't lost further :P On Wed, Apr 02, 2025 at 01:32:52PM +0200, David Hildenbrand wrote: > On 02.04.25 13:19, Lorenzo Stoakes wrote: > > On Thu, Mar 27, 2025 at 09:59:02AM +0800, kernel test robot wrote: > > > BCC: lkp@intel.com > > > CC: oe-kbuild-all@lists.linux.dev > > > In-Reply-To: <20250325191951.471185-1-david@redhat.com> > > > References: <20250325191951.471185-1-david@redhat.com> > > > TO: David Hildenbrand > > > > > > Hi David, > > > > > > kernel test robot noticed the following build warnings: > > > > > > [auto build test WARNING on 38fec10eb60d687e30c8c6b5420d86e8149f7557] > > > > > > url: https://github.com/intel-lab-lkp/linux/commits/David-Hildenbrand/x86-mm-pat-Fix-VM_PAT-handling-when-fork-fails-in-copy_page_range/20250326-032200 > > > base: 38fec10eb60d687e30c8c6b5420d86e8149f7557 > > > patch link: https://lore.kernel.org/r/20250325191951.471185-1-david%40redhat.com > > > patch subject: [PATCH v3] x86/mm/pat: Fix VM_PAT handling when fork() fails in copy_page_range() > > > :::::: branch date: 31 hours ago > > > :::::: commit date: 31 hours ago > > > config: hexagon-randconfig-r073-20250327 (https://download.01.org/0day-ci/archive/20250327/202503270941.IFILyNCX-lkp@intel.com/config) > > > compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project c2692afc0a92cd5da140dfcdfff7818a5b8ce997) > > > > > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > > > the same patch/commit), kindly add following tags > > > | Reported-by: kernel test robot > > > | Reported-by: Dan Carpenter > > > | Closes: https://lore.kernel.org/r/202503270941.IFILyNCX-lkp@intel.com/ > > > > > > smatch warnings: > > > mm/memory.c:1428 copy_page_range() error: uninitialized symbol 'pfn'. > > Huh, > > how did the original report not make it into my inbox ? :/ Yeah it's odd... maybe broken script? > > Thanks for replying Lorenzo! NP! > > > > > I have a feeling this is because if ndef __HAVE_PFNMAP_TRACKING you just > > don't touch pfn at all, but also I see in the new track_pfn_copy() there > > are code paths where pfn doesn't get set, but you still pass the > > uninitialised pfn to untrack_pfn_copy()... > > If track_pfn_copy() returns 0 and VM_PAT applies, the pfn is set. Otherwise > (returns an error), we immediately return from copy_page_range(). > > So once we reach untrack_pfn_copy() ... the PFN was set. > > In case of !__HAVE_PFNMAP_TRACKING the pfn is not set and not used. > > > > > I mean it could also be in the case of !(src_vma->vm_flags & VM_PAT) (but & > > VM_PFNMAP), where we return 0 but still pass pfn to untrack_pfn_copy()... > > I assume that's what it is complaining about, and it doesn't figure out that > the parameter is unused. > > So likely it's best to just initialize pfn to 0. > > > > > This is all super icky, we probably want to actually have track_pfn_copy() > > indicate whether we want to later untrack, not only if there's an error. > > Sounds overly-complicated. But having a pfn != 0 might work. > > > > Will comment accordingly on patch, but I mean I don't like the idea of > us > > just initialising the pfn here, because... what to?... :) Sure, I mean for all of above let's have the debate on the main patch I guess so it's in one place... > Stared at that code for too long (and I reached a point where the PAT stuff > absolutely annoys me). But, also lol. Can. Relate. > > Thanks! > > -- > Cheers, > > David / dhildenb > Cheers, Lorenzo