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 X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6DDCDC433DB for ; Tue, 12 Jan 2021 17:11:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2FAAD2311C for ; Tue, 12 Jan 2021 17:11:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405985AbhALRLB (ORCPT ); Tue, 12 Jan 2021 12:11:01 -0500 Received: from userp2130.oracle.com ([156.151.31.86]:42556 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2405438AbhALRLA (ORCPT ); Tue, 12 Jan 2021 12:11:00 -0500 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 10CH9C6E108476; Tue, 12 Jan 2021 17:10:12 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=to : cc : subject : from : message-id : references : date : in-reply-to : content-type : mime-version; s=corp-2020-01-29; bh=IlbVk9yfievLMwMH174fFPZHiYCq2kBiKxNxYwxgr0o=; b=mY/gTqfkq5BsuJXKa9UqrmX5x2IVZH/2dcxr23lzzCtygF4f4kmaiIcq1UJfq46O0LYx HA+7QWn+WolYshy4LvUV1EWOpCgxhrYqKFefGB0+/klOLJnjNpU9VDw1Bp0a8HCD2GPz is9wAwOJHaUWtBlaBsX4qai+uaQvxHyIkf2ykRFL1hXqYAvKDaBVIrPH1tU/mNX5QKhh d0Y7B+2T7+RDyjxQZsWfKfY/65/DXmT5YFfcvahzMrf++M6A4kJJaEHQOt3qr48Xm0Uk i62fMpKy1Ni+X01l5uQy9SaI51Nk3D4p3z1Q+Ox+BMWroL9e+Gmlpn9p+1pgwQh/ZfeZ Lg== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2130.oracle.com with ESMTP id 360kvjybvy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 12 Jan 2021 17:10:12 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 10CHA34l114791; Tue, 12 Jan 2021 17:10:11 GMT Received: from nam04-dm6-obe.outbound.protection.outlook.com (mail-dm6nam08lp2047.outbound.protection.outlook.com [104.47.73.47]) by aserp3030.oracle.com with ESMTP id 360key3mf0-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 12 Jan 2021 17:10:11 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=MfmDRutXBYE/Rna4bn+BLOGPAdJKTejeS8UgRkJxe8F+ZlTMm0iNAqiNMsjZPHCbeg0DC1lySpfs3hLrW0f7T4vcHPUiXLQYFCCEMqsMu31vZeO7BDC8QgSMQdnf3YkW9GVw3QmBPFFZiDRDRqfDJAild8ePA9E77tiIl3WhvErh0XJjlq52YbyIlerB6OLE9txQQjwDKGW8Q5idYkk3n68RS6VyfCAgDMY5j4/HcMJFY+jxOhq4dxCxMVQKAIYnqS0Sh0VyUSqUnbKF9NH2FVskwXqcpc5o2qLCF+PLxxNh4ECv/LTfJu098Wll/mDtl6N8EXBwHOnyixhkPUGMMA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=IlbVk9yfievLMwMH174fFPZHiYCq2kBiKxNxYwxgr0o=; b=iQ+gvRL8SjKyHuof2FI0fHGrYjlY5qN6uVWnyMokdfeg2zU1MHEAXKmN8mrQHbPGoV3ML6i1BCIArF2dErGI7QF3vTu1B6+B6GvISrlpPpZHUEBT8cmpS8qs5R9j7mibON0z8q+1H76mvC1wjVaVGcB+Tdh+RwvhhPN4Cm7y3/Ft4por91i+3AEwp2R1v4DSaeW4jAYqr8sLPcGSmgi+wLKncBb0XLHgGHE94dyiF5132v4knE7GCdidshJrgqa+wof0EBR8URTbBbQleSMEU5hOhqqt8t7HvAOKqrzJ0HMDN042ePkpjpYPJg60h9kmrIIx6zDlBaHGfGYg36AXWA== 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=IlbVk9yfievLMwMH174fFPZHiYCq2kBiKxNxYwxgr0o=; b=JfS42BwPLnBX6yUmHo2s4/iBmqC8zn7rGi00UOgjhICbcBl7tjr9aUXWaBwWy9KzmTKO3ApELhKFexo/X/BvpM7kuf0/H2OgLqABr6qnIDxLEzqjS/6pK5snDPKTgqAxJ2LVnRDk5De0YFLRVTm0iRKCXLtE5nikm8SVavtaZfY= Authentication-Results: smartx.com; dkim=none (message not signed) header.d=none;smartx.com; dmarc=none action=none header.from=oracle.com; Received: from PH0PR10MB4759.namprd10.prod.outlook.com (2603:10b6:510:3d::12) by PH0PR10MB4502.namprd10.prod.outlook.com (2603:10b6:510:31::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3742.6; Tue, 12 Jan 2021 17:10:09 +0000 Received: from PH0PR10MB4759.namprd10.prod.outlook.com ([fe80::54f3:a8aa:a2cd:a3a4]) by PH0PR10MB4759.namprd10.prod.outlook.com ([fe80::54f3:a8aa:a2cd:a3a4%5]) with mapi id 15.20.3763.009; Tue, 12 Jan 2021 17:10:08 +0000 To: Li Feng Cc: Jens Axboe , linux-block@vger.kernel.org (open list:BLOCK LAYER), linux-kernel@vger.kernel.org (open list), lifeng1519@gmail.com Subject: Re: [PATCH v2] blk: avoid divide-by-zero with zero granularity From: "Martin K. Petersen" Organization: Oracle Corporation Message-ID: References: <20210112152951.154024-1-fengli@smartx.com> <20210112155502.426331-1-fengli@smartx.com> Date: Tue, 12 Jan 2021 12:10:05 -0500 In-Reply-To: <20210112155502.426331-1-fengli@smartx.com> (Li Feng's message of "Tue, 12 Jan 2021 23:55:02 +0800") Content-Type: text/plain X-Originating-IP: [138.3.200.58] X-ClientProxiedBy: SJ0PR13CA0152.namprd13.prod.outlook.com (2603:10b6:a03:2c7::7) To PH0PR10MB4759.namprd10.prod.outlook.com (2603:10b6:510:3d::12) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from ca-mkp.ca.oracle.com (138.3.200.58) by SJ0PR13CA0152.namprd13.prod.outlook.com (2603:10b6:a03:2c7::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3763.2 via Frontend Transport; Tue, 12 Jan 2021 17:10:08 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 836c528a-5843-4467-b4ca-08d8b71cea31 X-MS-TrafficTypeDiagnostic: PH0PR10MB4502: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:4502; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: GD3CQpmld+tduX/9ELrUGraqCXW8CcTMjQ5OLELyQuIcpWJfLHx0t2Nq38N8dymI15veQRbkPjADFgidM9cpXxpoWYLNmPkEfjq3h3QhfiCTiY7Gavd5PdIJ2W2X7wDrjFhegg7tlqx+KJAE0nb9eOblAjxDs6x2vxROzchq/+LVEaEwYINT2w5i+LCbiaw6YvL92gmHQnaSG1p3SUPtnjm6+UzAIOc89qleBUscKTaYxwnGdFQDLhU3Gj0nbMaNESBgPH+PTJD2ff2wNhsfbCuWqtvOGZMp6CrECNu+xXnyaNYqUWzz6TO4+Y3McQ4rF1+FTBNsHkHBRDQDCmwZaApItVvkNyIiUZojd7Mr8g4ULaRV0Rv+mKAKO74dygD33i6dSuLTSyjETC/RIWFQpQ== X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PH0PR10MB4759.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(136003)(396003)(346002)(376002)(366004)(39840400004)(558084003)(36916002)(316002)(6666004)(6916009)(478600001)(55016002)(7696005)(16526019)(52116002)(66476007)(66946007)(8936002)(4326008)(26005)(186003)(8676002)(956004)(66556008)(86362001)(2906002)(5660300002)(83380400001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?G2OoxDL+TPg0uluunj0pTx7QohY/t0ycktpR6dGij+G9u0GIT+NyT+PnfoiG?= =?us-ascii?Q?KxjWZyzUPoz/fluveHcWm4s8CXKKrt1RpaIGPbi1ySsZ+rauQOmmdYBmmzSk?= =?us-ascii?Q?z9SXpUTFRiFD57h7BkleHn5Dmga2HExmVWvczWjGK0RQzbpVpiVQ45wSbC03?= =?us-ascii?Q?mP4n3gjWWsN5ES91TgXXu+gMmjlCS1nfcgV/kCK08Oif6lVkERwCvonS867N?= =?us-ascii?Q?hU4CE7IBrmWE0Y8BSShDd4tEwTlAIZGJ1a2hdVreWdaiNP+DYmEWM152qZQt?= =?us-ascii?Q?h6UhNt8cGFzuFkBLO6UKkB9QY6BbN8fHr0Ar75ZAsXG7SdnlASenO19Obcum?= =?us-ascii?Q?9+yrxhg6lYj7ixh79aiok2pWvMZWkyyaEKrY9jupInQUHuRTNuIo0See1CfZ?= =?us-ascii?Q?uJ0vMncOyyTqiR/3NLqfxYvCGdon9+JvcHIfi5VJI1kFEle4Nki3Wpj/THYO?= =?us-ascii?Q?O1f6y09/3NSlmQ3qxevEYTMJ60me/KNkU9ftl62jGC517es1vr1VBvlhivzE?= =?us-ascii?Q?qnn753rqFlqlbN6z4U8LSARXoViLdjJSd7p8s528+76t2qBTZx1VWIDJgz0X?= =?us-ascii?Q?oxKqgxALtQ4Uq4u5AWNL0N1LWtpVkqggfc7Vxfj8u7trpGu+q156d4Jh5ab3?= =?us-ascii?Q?yOrL8ioMUR0PoRapUC/+bxsSTIGvuuCSbUlxEDHjGSFNubELnFdoBDTUlKnm?= =?us-ascii?Q?lL2NNvnid7NpLW2kZDDEN6DZNxd/xBW54KA65l9kjj+zUYajx7/UjIE84hUc?= =?us-ascii?Q?JL7YlorBx4KMaqHivLNN0yOgNgIkECrp00AaTu0ieJ4rftf0v3RLAPy/hCOG?= =?us-ascii?Q?ND4cdomgDuXDSlxDc1cPz4YTAyDqGshmWGSnhbprRGFz1GrKTMyaUX59UjVc?= =?us-ascii?Q?eGw/ZQubm5N94am+TXQspvaKSc6Nb1j+jJyPGOEaEDIRQueLV5pqC1v7z/Rf?= =?us-ascii?Q?qM71JUVPowvNJ6KlK6SNAP5wrS76RYekgNX78IGbwxY=3D?= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-AuthSource: PH0PR10MB4759.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Jan 2021 17:10:08.7296 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-Network-Message-Id: 836c528a-5843-4467-b4ca-08d8b71cea31 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: ap6DhSQNZ4M2vkPepR9zIAifEeSt4ShE+5OKdYGWnmSRDxSxqClLI3CdAJYRamqKyUkvjt2KpMBCwkLPLViFL3nBMpaYJoKCLa9lQV0iAc4= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR10MB4502 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9862 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 bulkscore=0 malwarescore=0 suspectscore=0 adultscore=0 spamscore=0 mlxlogscore=889 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101120100 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9862 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 phishscore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 clxscore=1011 impostorscore=0 spamscore=0 mlxscore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101120100 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Li, > If the physical_block_size and io_min is less than a sector, That's not supposed to happen. What device/driver is this? -- Martin K. Petersen Oracle Linux Engineering