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 A524AF531CA for ; Mon, 13 Apr 2026 20:51:42 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E831D6B00BC; Mon, 13 Apr 2026 16:51:41 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E5B016B00BD; Mon, 13 Apr 2026 16:51:41 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D71276B00BE; Mon, 13 Apr 2026 16:51:41 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id C4CBA6B00BC for ; Mon, 13 Apr 2026 16:51:41 -0400 (EDT) Received: from smtpin09.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 715B3E0DB9 for ; Mon, 13 Apr 2026 20:51:41 +0000 (UTC) X-FDA: 84654728802.09.1517DF7 Received: from CY7PR03CU001.outbound.protection.outlook.com (mail-westcentralusazon11010059.outbound.protection.outlook.com [40.93.198.59]) by imf17.hostedemail.com (Postfix) with ESMTP id B63BD40008 for ; Mon, 13 Apr 2026 20:51:38 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=PIxAu9Gs; spf=pass (imf17.hostedemail.com: domain of ziy@nvidia.com designates 40.93.198.59 as permitted sender) smtp.mailfrom=ziy@nvidia.com; dmarc=pass (policy=reject) header.from=nvidia.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=1776113498; 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=HgNnPZ9gojkYO19I2YySqkRIermST+JPU/nKrrzlkBc=; b=2ezpJPwsyuX3jzDDLtQaVAXqlhO+OgAu/8RyDHiRzGup48/kJFSpXjEtEpbBzKHG41bYyi ja0lRh9Job9QUzcaDAtIIF/z3JpCxmZaOvaiwzc57NH1cS2+XzlgrNANrU7GQvsHo8m+7S dDzFCDEdtXrAaGoH3Z86BDzgpmCF7R0= ARC-Authentication-Results: i=2; imf17.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=PIxAu9Gs; spf=pass (imf17.hostedemail.com: domain of ziy@nvidia.com designates 40.93.198.59 as permitted sender) smtp.mailfrom=ziy@nvidia.com; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1776113498; a=rsa-sha256; cv=pass; b=IXKU+l0VuNkR9Xy8M3dImJyHu+Im2Vt0pzfyJ7JbY3eg0VJvc0Qi8QzvW3MXPJhRGhF0JV 1lcwJuMy37007EEHvpoDfWbqupakEqhtRWnR+dMAnA5VVzYxxcqu+hJ9lvWY6Ta20fwGSW 5S/gltlHzvezImhbeF6Pp616ok9ecKE= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=RJpYKwZLPNNtDxvKX8IVouaj6w36mZMyOCC2H/yP9Uo2QplBS5znKfF+h5QXVgo8rx2N9NBOWsuyS9haBYPteuSH0Og02bWzvvbvishji7dfokZyaUPJxjalF1JXXNo06HjpzFCJ/bIzi79CWhK8cfakZIZtmasIx8VhSQo0maXMjDvXgW28crg+4OXIWnw7Billcff8hXx/QNCKiY6FmOYAyPSZ6JM5Bi7jSAVFcL/rgfXKmf7FvNOQemG17hqy8o+tqG/fW7eIyTsW2oG294GtpukzKj+X/wIbUKlRwUra8cORO+FDgu5pbqxB+PUuHOeI+TOKSYUJvFV3CuOuUg== 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=HgNnPZ9gojkYO19I2YySqkRIermST+JPU/nKrrzlkBc=; b=jYIo0gcEtli4iBO8j2bWxQfE08xQqei4n9inFqXEBx0TqqLVP6/PMt9WTsPztCpzpZmTvvorvTVESBkhXeqx8PHONvZ+LWnd6lfVYrPgqxnt9SDYFZZgDSpiIGNE4SjPEADSWRHDS1+PRIgYUoVXAe6AhEKGA7m2b+Ygunh9fods/Pj8BI/qZEvWKAUdbVkPs37qA//NGgf9wGgtfiXbGKRAM0asdtZPlLIpgKHLAcTGzPkWwtA/l+h/n54M5H7tn7SvLJ+uB9ByAIVdEqZFfm4E48q3CjoXJZElsjxC//fpyf+9g4t4AD7IsH2C4gkygGfpEfMVJbKaP1jerMW9gA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=HgNnPZ9gojkYO19I2YySqkRIermST+JPU/nKrrzlkBc=; b=PIxAu9Gs9/bj8MPgU8Fmy0gja0jKjnz2ogb4fxAoFqtYBT8KKOZS5gpHyx29R/fJf89xzFrrHvTG3A0neTpYgSUFKKlETgVjkoWYU1on6EcW+eT3wgapfnqWv+bdeTVIS2iI6LB0AKPsbiVgDAKGZr31b+XbtNlbHU2SGzvDN+8smb6xhWYeAEcmKxjIJPiwPkqkA3uplMYV2CovI2sXRVclLF4CJdonD2XulHA26F1uAkVC9c8A1CWblp/w4rM33yw7Z4I5EOeshiEy+QlgK0WIUWp+DU3LsvXk/HfH/6DINsJOcAPhSNii1nDpINwI/zd9U/Fo/+aRAyCBKQbiyA== Received: from DS7PR12MB9473.namprd12.prod.outlook.com (2603:10b6:8:252::5) by CYYPR12MB8871.namprd12.prod.outlook.com (2603:10b6:930:c2::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9769.48; Mon, 13 Apr 2026 20:51:31 +0000 Received: from DS7PR12MB9473.namprd12.prod.outlook.com ([fe80::f01d:73d2:2dda:c7b2]) by DS7PR12MB9473.namprd12.prod.outlook.com ([fe80::f01d:73d2:2dda:c7b2%4]) with mapi id 15.20.9769.046; Mon, 13 Apr 2026 20:51:31 +0000 From: Zi Yan To: Matthew Wilcox Cc: Song Liu , Chris Mason , David Sterba , Alexander Viro , Christian Brauner , Jan Kara , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH 7.2 v2 12/12] selftests/mm: remove READ_ONLY_THP_FOR_FS from comments in guard-regions Date: Mon, 13 Apr 2026 16:51:28 -0400 X-Mailer: MailMate (2.0r6290) Message-ID: In-Reply-To: References: <20260413192030.3275825-1-ziy@nvidia.com> <20260413192030.3275825-13-ziy@nvidia.com> Content-Type: text/plain X-ClientProxiedBy: BL1PR13CA0018.namprd13.prod.outlook.com (2603:10b6:208:256::23) To DS7PR12MB9473.namprd12.prod.outlook.com (2603:10b6:8:252::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR12MB9473:EE_|CYYPR12MB8871:EE_ X-MS-Office365-Filtering-Correlation-Id: a7310ce7-e331-4423-7ee2-08de999e70fe X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|7416014|376014|18002099003|22082099003|56012099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DS7PR12MB9473.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(366016)(7416014)(376014)(18002099003)(22082099003)(56012099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?MTLRMkINsVJNuvGL1iVskdqWlnPsa7zQabFZX4/YdfDMtybN9FoOqqTYH3m6?= =?us-ascii?Q?h8L12uNODRDaauomMVXn80QzZDomalaLuZ8KfrjWkpsMN9J4him8Cy6nvKO/?= =?us-ascii?Q?stLRSNEobe5ENoAp8Cy0l67bDceFZ4Mzf77/9XgL/P/KLpGxlh/MBh3NGLp/?= =?us-ascii?Q?ubk08vfFgAQf3Y4yJ7SnjDGY/OedMB5dA8y22W8U2jdaR1ChUCEn9RrFg/0Q?= =?us-ascii?Q?qlg6drUIw8FN7rTODqB+S6r+yz1ZuIXvfQ8w3HzJ55OJGklf0pRexfFkHkgX?= =?us-ascii?Q?GD4upabkkxzNHNUnxp3iw6wX9IrSvlnlfl8n1SdJcUSNUQoND5ovLGhPyXFr?= =?us-ascii?Q?JvLCQYXPaQGsapjDloLmc5zG76X7sgCxQV3EtOZ6JhQdb/IL7BiYkJHu0UpE?= =?us-ascii?Q?sGEOb775aUsQscYbJvbKJYNcPnt72En7hwHPD3UmXIwSOJQqeFXlTxmdciFO?= =?us-ascii?Q?uBSa2Cc4E3htr1QRH+N2sZTT8wXtMxSHYWcYrVQbR0jFxkAFaebX9wr40R4L?= =?us-ascii?Q?B8WXrKCvSqBPclIIThWu7HF69e4thKDh1ORJieXt5nVnTq71Mym1eQBPncXP?= =?us-ascii?Q?VwQAI2iYvtiLHWTM8sdu41UvPHTt/S6fJU52toiUKUuVVLUNPP6hWx6y1ChL?= =?us-ascii?Q?VoOtCMDp5LArrUff2Q9sh0UMwt9lRBInv1r3Lbap7cN6a676yuOxXJoSe/IX?= =?us-ascii?Q?EbCAREw0RM4EC66B+UXyH2zRbr/bZa/CMWi2U9jhQLE23ftVqryfohvAb/70?= =?us-ascii?Q?7AasS9JrXlS84yUcLRKkKqjvl4EHYWHhMkevF7mG5yd7HrP4zoydWStGi8zy?= =?us-ascii?Q?D620v5T5vs69pbyPWvsRcRxfquKC29O4OVsO8Li0n9rT8yxX9p0zs9t7Z/Mn?= =?us-ascii?Q?Kp95gDVntv7u2KY1wmPy/nHOoLKx67n5/SreVFuV9Eues/SsEJXwN4MIJMuO?= =?us-ascii?Q?cmCLgZknHUuBStIJncDAnt9+rh2nvDqJsU0XXWOceB1tysr7rpwd3hJcHfMB?= =?us-ascii?Q?TK4qqrMgF0Lp97ArESKyHlRwcopkbhT+QU6tLRu19hCOa+KtBgMOCvkLBUjR?= =?us-ascii?Q?6iAbP4MlV2EkMNDTPRVJHYpTgYdLTl6OXx/jHohJlpeEhgUXATT34HulAGZG?= =?us-ascii?Q?wXvrIqBHydVaBuOIa1kAZ/ND6tID2MY/hL0hSiakCYCb0F/HEW3Lh0od/alw?= =?us-ascii?Q?kraDXAFjhaSAvmvnZGTapj6JneIBZy8Aw9MSLnf1EGzH30//GHoTeaZNoAwP?= =?us-ascii?Q?uHEBXuznVY6J0aKY/BAx1GOhguYmT4XYQmnA9MxFqa4e/M5Kg/hTM64xCaim?= =?us-ascii?Q?d+sq0kC0iX9Mf1bD2spuTgPs6BqrFmRLw5sijAm0imDpFiglBAosPTGkV6nM?= =?us-ascii?Q?UUoGIBzdPOfGTd3+HXnJLHZaAormZl9E2AmoPj6XGhdoGP4FGDeaacA2vuT5?= =?us-ascii?Q?bdpkgUlanL+Wd50WY1DNKtcYljasu76kBieK10Ph55gZtGsLKV/AaWg+HSWX?= =?us-ascii?Q?ng0zys92VfyFkqbGBVx8dUkG6BK+cb3UlZTK2aB94B1Hmb9enQCDvdMaW+DM?= =?us-ascii?Q?nLCquHO5qCgxdmRxy12W0ys9r45R/kZITNdbhL+t4jXO3yfdqXr31k9K+rg7?= =?us-ascii?Q?82ytbcOeUIPWCUz5uEQD5RdA97Mwxx5Ife6/t0VrNEvtS6w8Hed/sjMJm49W?= =?us-ascii?Q?aJuJ1isSifbmKj4IBJd/DrT2Ak0eRg2pdOVRlkD9/b5FGp6BNJ3fH8WWK2Fr?= =?us-ascii?Q?uR//FDobLA=3D=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: a7310ce7-e331-4423-7ee2-08de999e70fe X-MS-Exchange-CrossTenant-AuthSource: DS7PR12MB9473.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Apr 2026 20:51:31.3874 (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: Yo19esFsH13yure6/aQerOaVhvaCxe+G5tl1QzwgQnCqPSyV/YsKvxfOVAYG+XHp X-MS-Exchange-Transport-CrossTenantHeadersStamped: CYYPR12MB8871 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: B63BD40008 X-Stat-Signature: qbohstdahohwkbhw8txahi4zqufyx9en X-Rspam-User: X-HE-Tag: 1776113498-897640 X-HE-Meta: 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 R2L68yB9 bmScP34aYO9S7AJLtvV2JE4Z6QOMpzJc10WAzRiekU5rQv7EsrBOAgrt2bMrXRfjvUbxAJEITQwysUPtroacovcarl3lmnouNYZW4n1O0W80qx1AlRPiMVv8/5Q34nvkcWD1il0gH9z2k0gZQWdN7+7+HbMx8FJC1kdjJCZFAzfej81AQwvVITpDwrW9PBxfycLW/z1VyqLDM6Z0cz2bYwP+Ywlz4eZ0bHXL6/bymi2IkKHAfOlBqIOuqSyLAkQ7vRetD28s1Ynvn5SpK3f2SdhIQ9fJvUfje2U1WHwAoVyjqOuwLww/7UN0NuTpJ9OEDUt4iLHgdG6QeUJmDSWqJ2R/U3dLBFtqyxTq7uFiawTKzdAer1G0vjbwC3g== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 13 Apr 2026, at 16:47, Matthew Wilcox wrote: > On Mon, Apr 13, 2026 at 03:20:30PM -0400, Zi Yan wrote: >> +++ b/tools/testing/selftests/mm/guard-regions.c >> @@ -2205,7 +2205,7 @@ TEST_F(guard_regions, collapse) >> >> /* >> * We must close and re-open local-file backed as read-only for >> - * CONFIG_READ_ONLY_THP_FOR_FS to work. >> + * MADV_COLLAPSE to work. > > Is this true? Does MADV_COLLAPSE refuse to work on writable files? > Should we delete some code here as well as fix the comment? ;-) file_thp_enabled() used by __thp_vma_allowable_orders() refuses writable files with inode_is_open_for_write(). That should prevent MADV_COLLAPSE from working on writable files. Best Regards, Yan, Zi