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 329F2CCD1AB for ; Wed, 22 Oct 2025 03:37:08 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 8FEDA8E000B; Tue, 21 Oct 2025 23:37:07 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8AFAC8E0002; Tue, 21 Oct 2025 23:37:07 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 79E878E000B; Tue, 21 Oct 2025 23:37:07 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 68ECE8E0002 for ; Tue, 21 Oct 2025 23:37:07 -0400 (EDT) Received: from smtpin19.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 119611406FD for ; Wed, 22 Oct 2025 03:37:07 +0000 (UTC) X-FDA: 84024339294.19.BC3CB1B Received: from BN1PR04CU002.outbound.protection.outlook.com (mail-eastus2azon11010014.outbound.protection.outlook.com [52.101.56.14]) by imf24.hostedemail.com (Postfix) with ESMTP id 4564B180003 for ; Wed, 22 Oct 2025 03:37:04 +0000 (UTC) Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=JZs6cdev; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf24.hostedemail.com: domain of ziy@nvidia.com designates 52.101.56.14 as permitted sender) smtp.mailfrom=ziy@nvidia.com ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1761104224; a=rsa-sha256; cv=pass; b=d1yHF7VUCSWuQyZ7soPBR0Jj2o8yDmDIEeUjWXfAgcn9GHGU1q8yjd9fkeFUMS+8o71Jpw bgjuO9b9AMzCMFB5N7SVDbuyeN+sFu3kcme5aKyfq3tSCY8GEYgKK5ZO4HUVPgwItEpy0r wcbyVhKOlIIAJ2tOu5ZTnkLCXUFK+HU= ARC-Authentication-Results: i=2; imf24.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=JZs6cdev; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf24.hostedemail.com: domain of ziy@nvidia.com designates 52.101.56.14 as permitted sender) smtp.mailfrom=ziy@nvidia.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1761104224; 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:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=YNWpJDD8I94LJ2Ocy7mlNJTkesGvDb/m3LvR8DBD1WU=; b=OG5LLa56Q1DphsoswYAngwxVflF+UCrIY/XSnCEFOGBdyoeyulamAmCJQtCJwzdFItTM9v e/QmYQ6iozPysG5Dpnp1WYUzKx/Y6UsgBgj54VQKU3ZlrJGygHCviCmqcIWdbPF0n2ulhI cC7k5yphn8lgwK/R83SuGjlkv5xeXrE= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=UU0oWbRBcM6Ye9rgCAs0zwQ38QfIe1hp8EjQMpKG4lc/1BK+f53A2tyzUFv+bPKAOs85XaIvcvq/kEM3TdMJAEQhEg5dD/FSHCAPkqyr4Cw1dRtTak3rtpm0qm4/AIXE8vrTXUTjUutM/KPpjVimscUqS6llxv/r+npAMa3uF03T2Hpg5L6RdCGa6hl+BDiXq2nebe/7s9Viqyc6ujiM3/cufeDiDH0KwJWxjkU+dwyp/UIfovLSff5pkM9ecUO2gomfSJsfkvuRFxZaRmvHlD6pL07imw/xlcQ/83xWRBafI+X+UbZ5A2DDEHgtWlNEpHoVMFrrT72Q5QJs7g8ZXA== 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=YNWpJDD8I94LJ2Ocy7mlNJTkesGvDb/m3LvR8DBD1WU=; b=Pjgxj3RTKLl3B4yp7bk+6Pj0dO/PHBhRmSDKVOxdRMusMDCs+sXCTT/T3SNgqmBbGQ9YLbnXcsf+705GXvvUgXNiBnYANQ5M+IZlgFilTVYX6+5NfBbnM8Z+/BTnFoKUTx8aEXw3FFZHcD2q2LLZYzVIT2pTGT4WsX8UY7E25ThpwbRWP0HBI7BS5W0BIznV5TxLaSvDmkOVLwN6M3pKEbiQp+lw/TbsrHtegSUWDHRwa4zBb73kJXASxdfe6xSeNqspdzWE+O8vE1W5dTXdKslSbuGBl34012wJ8JsTu1yJOQODqqIXXaqxvZOKJBDt8LrUFnqt/1g34YeDEQ3s6Q== 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=YNWpJDD8I94LJ2Ocy7mlNJTkesGvDb/m3LvR8DBD1WU=; b=JZs6cdevuWWk/qmZjxZ8ap4W6eDYwEH7csIPdNakO/WmRMLjD/CmmSqUiyo4vPQguY74Qm7ibNnUZxs5vi5rKFCTnnFTWYeRWu69i51q4H0Zd8+6YoaXJNQO30C5CH9EhvTrtmu1O2vmKtfQ7yr29X47GGyBJMPgFZg7UTrfc7A+Kbd0NC1/SvcYa6aKFIXUiQZUltc6eKz9X3LI8i49RqZpTfGZkQv1RtJ4RwTqNH/Z7OPCiWkOHijrIuI3Q1FDkJWxePncUhnYH2fjwA2YCm7xx2D/NjUdgyDKKbw6Q7wRirWi96lFmboKYXS/4omLCrGVLwrYa9CRpgCHlpKKYQ== Received: from DS7PR12MB9473.namprd12.prod.outlook.com (2603:10b6:8:252::5) by SJ1PR12MB6268.namprd12.prod.outlook.com (2603:10b6:a03:455::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9228.16; Wed, 22 Oct 2025 03:36:47 +0000 Received: from DS7PR12MB9473.namprd12.prod.outlook.com ([fe80::5189:ecec:d84a:133a]) by DS7PR12MB9473.namprd12.prod.outlook.com ([fe80::5189:ecec:d84a:133a%5]) with mapi id 15.20.9253.011; Wed, 22 Oct 2025 03:36:47 +0000 From: Zi Yan To: linmiaohe@huawei.com, david@redhat.com, jane.chu@oracle.com Cc: kernel@pankajraghav.com, ziy@nvidia.com, akpm@linux-foundation.org, mcgrof@kernel.org, nao.horiguchi@gmail.com, Lorenzo Stoakes , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , "Matthew Wilcox (Oracle)" , Wei Yang , Yang Shi , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v3 1/4] mm/huge_memory: preserve PG_has_hwpoisoned if a folio is split to >0 order Date: Tue, 21 Oct 2025 23:35:27 -0400 Message-ID: <20251022033531.389351-2-ziy@nvidia.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251022033531.389351-1-ziy@nvidia.com> References: <20251022033531.389351-1-ziy@nvidia.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: MN2PR05CA0019.namprd05.prod.outlook.com (2603:10b6:208:c0::32) To DS7PR12MB9473.namprd12.prod.outlook.com (2603:10b6:8:252::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR12MB9473:EE_|SJ1PR12MB6268:EE_ X-MS-Office365-Filtering-Correlation-Id: 779f291d-08a1-413b-286d-08de111c3a95 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|366016; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?t/RsHpjAAdfaQuIIcHNV96jmFRMELSZz0QA2D+v0I75gJAF4R/O+/fSZgcR8?= =?us-ascii?Q?EyE3eNqZbe32PAge47elPH4UA+UpQHsFZyOjOLD0HmIdy/ZHixR33NryPYZN?= =?us-ascii?Q?LSdwINH3UrYH/PbZXANojprHZZlU51OQmMlfCFJPVBdMyZ4XhDEFGdkDB2PY?= =?us-ascii?Q?/EnbcEi1+iOlFp4S7tnuPLqoOBWIWyJClkY76bPjUZ8eipt10db0/aWta+67?= =?us-ascii?Q?zhsbDA6cn97CpK5KoPx0O/KtehOXRb7wuwF2KDiHOk/Z0Q937tmwN52M+FHF?= =?us-ascii?Q?WeHIOK1kYqbT0lLfRcYKfM+q9hCAv2TApZr86m+YQ4dJCdKBvb8vcbwIjGbH?= =?us-ascii?Q?VXep5WmrD7R93V4Zmi5r4YIiAHBZgs7kqlyxYlsEF0t3F8mhDllEDkxlFpV2?= =?us-ascii?Q?JOx13JLqozszGWKr25szJ+knP8PD1IpSfUCf0+lPmFh6msgeXGVym4ptmCAa?= =?us-ascii?Q?IDsjtip3cwJFBYq5r11UImjF3QWRxyXSdbQ3dR/2xFWVcTQ1HbWRAZk68TMN?= =?us-ascii?Q?McFphk31GtpIjhtAHzbm4aELNm0d/i1r8c3eckmnFkcZZfW/jINfgETINx0X?= =?us-ascii?Q?dly3FRHtn3N+TuLRiXZlLEagc9Bs8AbZKzoYk5kSSJgcWvbG2B66RRmRpWxO?= =?us-ascii?Q?ly3sS+ngWmQrIHMTAffDZ0zNrRpFCe98R4KCDD1HFx4t0iql/AUyIMnWhMFp?= =?us-ascii?Q?GOyBtf2bySAyTfFZBJMOFLZOnUGaWcfpYDRgakZOmlwv67e4uuFgPVuGawB3?= =?us-ascii?Q?tLUhlLFifdoXQRQiXR5Etd9ZCY6FEhVAnfom8HBsScOyhjWRLCw28h6n32xB?= =?us-ascii?Q?SErrljbvncZmQ8e/UfqxTCahgY9mGMM492RAvHk+IoA856RnlA8NSNGCD08u?= =?us-ascii?Q?39gQ43n40Sg+zhEHqxebxX0R9aRVUdicf+6PBZ6EQWI+8jHnvk2HOCY9ixZq?= =?us-ascii?Q?6Z1kX0sensWH77A76DSliCtNhv/+L3Lt9fslmwSaKZTeM0wN8sbuHHY5eGtL?= =?us-ascii?Q?A7qNz8yKZ8h+V9JIEwjCVXiQXYdg+7G8eYtJeb26PjGxE29fjrbk2P61G07Q?= =?us-ascii?Q?2IyEIOyHJvzEAoiYNdvBuKhGZxSe+2J/bTtMo6wcJPUugAi/3+e81NiXVWm+?= =?us-ascii?Q?FCgrjd/Xt45Pc5HSF8UbpdeICdHy7AXgckaYQ2NjxM4Zsj5TXsnT++L9i+1h?= =?us-ascii?Q?FnnCImgBgiMByL8LHPWnQJ7wrYAjfuV0bgVZLRRJK9DvtGG34LbkUCX3Se0h?= =?us-ascii?Q?sb/1VaZ3bBMBjH3XybHv+QQhi10R/vC63hASdPW09hPk21GTmI7P5xDA+hqr?= =?us-ascii?Q?5ZrGishr2b5Xobz6woD4NDM8ieXTmHl+rLMq7GPju8wV6BmszCKKa30GT9/i?= =?us-ascii?Q?MIqTNPEsB/XWQYBH4y+NCv4AxodhSpdd6TzhdwETsVQaeQqT+JSzFWTpffzb?= =?us-ascii?Q?12uj5TXlavqsgh+ivFr4ZAWWouU6uvy64xQJ4O4xxJBypueIgDJ5sA=3D=3D?= 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)(7416014)(376014)(1800799024)(366016);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?ZC5e3qP57iKK0ufLS3LlyD6J1Xw2BV5sHDt500XQRW9qPFCfqdv3+DShCAzL?= =?us-ascii?Q?QGydNwu+1QAP0DI145I27iAvcqzdToXYlol3JNtR7sEOpPwBh17XxSzcfGTo?= =?us-ascii?Q?+xugLUAnZqrPQsIGvjvXy/8GnYd/jHpDHATaf4KkUTkB3hvI/q9SdVZqFMCx?= =?us-ascii?Q?mckTCTXX5gxo5I8o7hCjgZSc1SMeEuabK5DpRk/nhHCbOAdUEGld7nrlhh36?= =?us-ascii?Q?Vz4gK/CYDWeNukEbCG3LEtfiad819qO3vBQxSU+2/VS7v+7rsivxZoYGvf7k?= =?us-ascii?Q?5Opt8pMbrUQZ5mp8T9yo8eDFtS9Y0WPVMkaXANkFSdeYoLpaM3QBHamziAau?= =?us-ascii?Q?dWXvB/eZVRNO9kPCuuAwuTOdeBCZkvmwRJlZaYKMsBYRNmY78R0uDoT7s679?= =?us-ascii?Q?A4fMX1hOqqlu7wT4/dNrQmwxYfKoJiUeN9KIHs5//Zt0JnIacML9d39OzNjo?= =?us-ascii?Q?RtkZa8BDW9paFriRZcT8G7g95rANyQbQEBonL56uuxcXE0UgygfLvGiRtMHw?= =?us-ascii?Q?gK6y+ZdyZ+h3wj+au4by9mNIbuyZvPFS52Dt/WFclly59IrjKJo8NPGiBBFD?= =?us-ascii?Q?Dv70H3IlC2cvbrx27fz+FFOHhQckn0zliMV+Hd17MuOxZgZ0Hz1M5CAsGFqP?= =?us-ascii?Q?PbshRRHDVnpNic6fqK11/22CfmdlRIAcoRcsr6ZgLuGv+7OG3sRLug8/LvjU?= =?us-ascii?Q?NW5k8Qf80lMGu1O2Y+JPrZTY69NL1MyXDsT6FYkkPfCMck3wEeciK/yTo8ie?= =?us-ascii?Q?tPqiVxlLjgCvJeI7NqgUfhiEOBPBZY9sy6IRl2mJdnpVjmt/5DtlNSanRA7h?= =?us-ascii?Q?Fp9bKamIibqAja7SSyn5rpr2sEqMEB+BD/lrNEQRXahM9u5zq+anzl1q08PP?= =?us-ascii?Q?QcpPxGHsxcfLYLhGTY2xwioIoesBVZabiQ3c3H5Xh5hZonUM5akHiK/bqJIv?= =?us-ascii?Q?+t9Iu01s3VPjE5/KPPvZvm5YEJjM/vd4lgn9lsdfGGYGhIl1b0hcwOyMOjWl?= =?us-ascii?Q?SfhLUtfISgBXtjzqMGSYK6r5FSOo7n2XlPSWaIXcoP348HQB0vsvb9n3Vdki?= =?us-ascii?Q?JOEctzQB3H1x42OE7S/J6ZWqrsqEhvYiWKwUmE3xd8C882LDKMikjKgHVFDr?= =?us-ascii?Q?+AjOcvTHF3ku8W4qxCuuz1OTSh/1kzoQFRIOM7STR/G0mQiTTyDye0ghOKVJ?= =?us-ascii?Q?tg6HSvYSy5X9s5UqkIFpJG7R9iHE8CI1hsECmNeZ7aQ0TVyg5n/BZ1TutnfM?= =?us-ascii?Q?Qb4GoG75OeNULVauMopwyM0HvnFESttUXo6JTG+CbXYUUNKXHOv1b9c2JYNW?= =?us-ascii?Q?ZWwHOsZAjTOHfwe7A0sTPXOSxHHzRY9NGWWD4dn3H3RcO3Hex3T9ht3kEboN?= =?us-ascii?Q?MmYvTOw0eswB71ca9mOblpcgeECsvUhj8U0X9gzxNplp9KzAcX0eLPLtf3Lq?= =?us-ascii?Q?X0Wdem86c+EwqARmj+wx90+Z7oRwhntcaiFZ4j7oYpfXEoSH7add6i2zfhlW?= =?us-ascii?Q?b0iqpJkuwqa7iZosCn3buA52Lj4zAveZctmsOcYOB6HSpVvvX0pcr8qaMyww?= =?us-ascii?Q?Nom826HkwEM6DPDa+M7V+DaA3tWWmFWlSMV5WV/r?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 779f291d-08a1-413b-286d-08de111c3a95 X-MS-Exchange-CrossTenant-AuthSource: DS7PR12MB9473.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Oct 2025 03:36:47.4114 (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: +eEseUVzi6AIhABGX8V4FQekYcO/IyQKLzOuAQFk+L6X6FA9NV0nH3Db45TSuyeg X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ1PR12MB6268 X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 4564B180003 X-Stat-Signature: 5cmcb6kpya4an993ue3sang3w1gghpa9 X-HE-Tag: 1761104224-607724 X-HE-Meta: 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 Iqdy5Z4z 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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: folio split clears PG_has_hwpoisoned, but the flag should be preserved in after-split folios containing pages with PG_hwpoisoned flag if the folio is split to >0 order folios. Scan all pages in a to-be-split folio to determine which after-split folios need the flag. An alternatives is to change PG_has_hwpoisoned to PG_maybe_hwpoisoned to avoid the scan and set it on all after-split folios, but resulting false positive has undesirable negative impact. To remove false positive, caller of folio_test_has_hwpoisoned() and folio_contain_hwpoisoned_page() needs to do the scan. That might be causing a hassle for current and future callers and more costly than doing the scan in the split code. More details are discussed in [1]. It is OK that current implementation does not do this, because memory failure code always tries to split to order-0 folios and if a folio cannot be split to order-0, memory failure code either gives warnings or the split is not performed. Link: https://lore.kernel.org/all/CAHbLzkoOZm0PXxE9qwtF4gKR=cpRXrSrJ9V9Pm2DJexs985q4g@mail.gmail.com/ [1] Signed-off-by: Zi Yan --- mm/huge_memory.c | 28 +++++++++++++++++++++++++--- 1 file changed, 25 insertions(+), 3 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index fc65ec3393d2..f3896c1f130f 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -3455,6 +3455,17 @@ bool can_split_folio(struct folio *folio, int caller_pins, int *pextra_pins) caller_pins; } +static bool page_range_has_hwpoisoned(struct page *first_page, long nr_pages) +{ + long i; + + for (i = 0; i < nr_pages; i++) + if (PageHWPoison(first_page + i)) + return true; + + return false; +} + /* * It splits @folio into @new_order folios and copies the @folio metadata to * all the resulting folios. @@ -3462,22 +3473,32 @@ bool can_split_folio(struct folio *folio, int caller_pins, int *pextra_pins) static void __split_folio_to_order(struct folio *folio, int old_order, int new_order) { + /* Scan poisoned pages when split a poisoned folio to large folios */ + bool check_poisoned_pages = folio_test_has_hwpoisoned(folio) && + new_order != 0; long new_nr_pages = 1 << new_order; long nr_pages = 1 << old_order; long i; + folio_clear_has_hwpoisoned(folio); + + /* Check first new_nr_pages since the loop below skips them */ + if (check_poisoned_pages && + page_range_has_hwpoisoned(folio_page(folio, 0), new_nr_pages)) + folio_set_has_hwpoisoned(folio); /* * Skip the first new_nr_pages, since the new folio from them have all * the flags from the original folio. */ for (i = new_nr_pages; i < nr_pages; i += new_nr_pages) { struct page *new_head = &folio->page + i; - /* * Careful: new_folio is not a "real" folio before we cleared PageTail. * Don't pass it around before clear_compound_head(). */ struct folio *new_folio = (struct folio *)new_head; + bool poisoned_new_folio = check_poisoned_pages && + page_range_has_hwpoisoned(new_head, new_nr_pages); VM_BUG_ON_PAGE(atomic_read(&new_folio->_mapcount) != -1, new_head); @@ -3514,6 +3535,9 @@ static void __split_folio_to_order(struct folio *folio, int old_order, (1L << PG_dirty) | LRU_GEN_MASK | LRU_REFS_MASK)); + if (poisoned_new_folio) + folio_set_has_hwpoisoned(new_folio); + new_folio->mapping = folio->mapping; new_folio->index = folio->index + i; @@ -3600,8 +3624,6 @@ static int __split_unmapped_folio(struct folio *folio, int new_order, int start_order = uniform_split ? new_order : old_order - 1; int split_order; - folio_clear_has_hwpoisoned(folio); - /* * split to new_order one order at a time. For uniform split, * folio is split to new_order directly. -- 2.51.0