From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from SN4PR2101CU001.outbound.protection.outlook.com (mail-southcentralusazon11012042.outbound.protection.outlook.com [40.93.195.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9F5A11FC8 for ; Thu, 6 Nov 2025 04:09:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.93.195.42 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762402198; cv=fail; b=T+Q78nOxMgiBXqm3dHw81jHSeCnjelnKvPXk0sScmO2Uo2cCQzM8JP67R9FDx8zA3LCXBgUyE5ECzr+N1PIWPlYhUTjhlzIcHXajAvEbtMIx/NuTJZmbH6o30q1xofCGmU3OHtuEkniXYfTGO0KTY1zzaBasrgyNgtyzeTkA3qs= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762402198; c=relaxed/simple; bh=t+pOeJ++QJF1DQIxvph/8mk02gqnY+rWxHw51UrkPVk=; h=From:To:CC:Subject:Date:Message-ID:References:In-Reply-To: Content-Type:MIME-Version; b=o1iyHBiZNS7ef/wuqRrnDGj9j2Wg4hyP4mD0Vue7JIrCvM8o2hr3r3d0zmmRkE17JVHmqPEtjCyHMhuJltqOaeDTO+xWqtPI7jC3quck7A/9VP2/+c6KcQMywE8PyJC2ZBXukacM07GL9ruafW/ijy7LXZKTf3ub8dsfoJ7vmo4= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=jxDSv3xe; arc=fail smtp.client-ip=40.93.195.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="jxDSv3xe" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=guN6kNCiq+62NGlrl8lfbyaTZenVaYX1Zznq4QNbGXCmBWr7mdSP6Lu/4+UQix13F10pPMeiadj9V5gTKToxXV33b8Af4XGhoYNKY8P0ixoV7sBZqITrpHcA5RlwAD/zfjJIf2Cf6dotGXOElc6Y48jYGGsnavKf1VT+mfl++8VbzZIIEhfBiB+tzZuaAErznlw56a/c8erO+K/2jZQ7eOnpSVlNOJMp7K1Ezyk+DgVTd9Sdbl1ueS86axv90IxnpDTNceejXS4bBDfJA2zfajiTr8L5nH8Vd7eCKgPJJFDjzSBJsL91XhmGREFJsx6uNO7vE4ALANMoR588OZ3v4Q== 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=t+pOeJ++QJF1DQIxvph/8mk02gqnY+rWxHw51UrkPVk=; b=ANPdcBM8mWwtzxuLbrf4PDUp+w9gn4wHXC/UKvJc/TcZKPdQmg7D2zrmjk5MuGyKzP4xvxaYZbs+MXYZirmWxJEk+Jbvew6dhEebDQlq5Bk9XtxeFrbbMgHtOcaHOBpciWuwl/6+uuMiTCKKiLxj3e5qoDWuU99+9nSsstEw9/2lLMuuv+AUPabUGpSZUjd6mG9i+tehNkZHqWvo2LmEpf4MFy/S7nNQdVRa4BacArpDIogQ96j6M4C8KyyunJ41FcsvlNGrbejr7nR7DuWDwSBfHAanyErp2lfEL1JzNk/xOYJkn7+OIV4rXEp2WmFeVGuk+9B3Nr6rEaR5J3otMQ== 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=t+pOeJ++QJF1DQIxvph/8mk02gqnY+rWxHw51UrkPVk=; b=jxDSv3xecpQmiKLNIaNqK6j52bBVesIfRqRcUDLvbBAfyfDEBbiTjclX9nIMPCd9w0KM8lXfak6r5Q3ZkgrpQqFXGZNDDIWVMc/QY3RVnRet/N/xMpLM5eDa1ru/v0kAma2royd0XsVBp8GeFTrKfvJQx6XeNTtYSR/5XGz8fTJ6rNY5brVV3ufwNqCDQxLmRrRE3gJsUUFo/eHocYODD9jG99wjAXbx1P4byKx6kubRS4UluiZIqn4gImOTUaBAEnduGQ3BCbTCBCVUSEPl1vrQBemDJ9dy8Ya0e1mEji9eTg651cKCa+LRLxMaXZ65HBO+VEKPOSH78EAnqlmJ8Q== Received: from LV3PR12MB9404.namprd12.prod.outlook.com (2603:10b6:408:219::9) by CH3PR12MB8075.namprd12.prod.outlook.com (2603:10b6:610:122::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9298.9; Thu, 6 Nov 2025 04:09:51 +0000 Received: from LV3PR12MB9404.namprd12.prod.outlook.com ([fe80::57ac:82e6:1ec5:f40b]) by LV3PR12MB9404.namprd12.prod.outlook.com ([fe80::57ac:82e6:1ec5:f40b%5]) with mapi id 15.20.9275.015; Thu, 6 Nov 2025 04:09:51 +0000 From: Chaitanya Kulkarni To: Keith Busch CC: Keith Busch , "linux-block@vger.kernel.org" , "hans.holmberg@wdc.com" , "axboe@kernel.dk" , "dlemoal@kernel.org" , "hch@lst.de" Subject: Re: [PATCHv2 4/4] null_blk: allow byte aligned memory offsets Thread-Topic: [PATCHv2 4/4] null_blk: allow byte aligned memory offsets Thread-Index: AQHcTsBxiH7Q1ATMXk6iJaEuEeP6JbTlCOMA Date: Thu, 6 Nov 2025 04:09:51 +0000 Message-ID: <17c3fa95-2f08-4f06-bcee-f5ebdf836235@nvidia.com> References: <20251106015447.1372926-1-kbusch@meta.com> <20251106015447.1372926-5-kbusch@meta.com> In-Reply-To: <20251106015447.1372926-5-kbusch@meta.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla Thunderbird authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: LV3PR12MB9404:EE_|CH3PR12MB8075:EE_ x-ms-office365-filtering-correlation-id: 2b941065-d3ea-4992-65c9-08de1cea5544 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|376014|10070799003|366016|1800799024|38070700021; x-microsoft-antispam-message-info: =?utf-8?B?SFg2czZQaTRiZFRTWlFPZmRyNEJLWm95V2ZVYm53TG5lVEpxaFFWcmhmdm4v?= =?utf-8?B?M2NsLzJXUnN1eDAySGdqQis1d1pMQXA4SGVZTUVPZzBLZ1lwamh0UmN1QUdF?= =?utf-8?B?QzBnekNIQXRGWnFCbWpGZUFISmVJLzh2RHlzcFowek1IRmJneGVrR3hDVkth?= =?utf-8?B?N25XZlZKTmZ2WXhERUtRaHFlaWszR09sS3ZBeG90QTd4U2wveHpRUVkrYXpH?= =?utf-8?B?Q1V2UlRVNDY2a1R5Nkp3cEhUY2RWRndsNURpQjR3MG8zOVQwTWxQQytmTit6?= =?utf-8?B?OVNwRVUzWURHYlFkVUVtbXBCOHl3TGpYMVkva1RpYmRubllXYTVwM0YwT0JJ?= =?utf-8?B?ZVIrejN4bnN4eXBQQzl5dElrbHI2MlE0VWdRYU5PZVZ3djlGVE5SVDBYL01N?= =?utf-8?B?NkdnQnc5bEpZNnNHaUkzTVhyUkV0SU9ZbHowM1FYSkYvQXJWRURxRERpZWJy?= =?utf-8?B?M3BTV3N4akVJeTN6V3pCT2RyMEVFbXFoOUJFYUNFZWZLWDdRb2lMbm1KODkw?= =?utf-8?B?OUtuMnk0ckV4eGpMMkRhRjNwTlBKa1NFVXZ1K0NXYytnQysvTXhValM4UW1D?= =?utf-8?B?dGNONWlxMEFiV2R0RHlYZ2NiWG1hMGZ4RHVNTnZjaEZYZjRuSEkrbFcxWWpT?= =?utf-8?B?c1F1dVAraE5oNVlVcnpXOFFaU21iZk5VRnZPcXo2NnR0b25TblBtMWorbE8x?= =?utf-8?B?NXBuWWRNS3NrUFQrSDhkMGd2V3ZUTUxIOWpnbERRZ25ERnNjQjlVZXV2SmhV?= =?utf-8?B?cXJiaGNiSE1ST2xCN1ZvS21IdnpYdGYwSDdJNHNBNk0yNStaRTlMRTB5L2RE?= =?utf-8?B?NWp0c2ZBdUVIUUhoSmNNRXFuQnU4ZHc3WmljOWt2VnhNSVhaanhmTEVmMVcw?= =?utf-8?B?SjhpLzBTTTFsRHBnRHVNbVhVY25TU0pVVTlrNTBvUnE3TGp1RXNGVmIzL2xa?= =?utf-8?B?UHduVXNISzF2OG9KLzArZDhHWW9MemxhdUhPWEIwY3FIV3RQZExuOHJ6MGo0?= =?utf-8?B?ZmpwVnFsd09acnUrK2ZNSG5SUXA3QmMyY2lJNUtyTFBLNTdvWUltOGpIbWE1?= =?utf-8?B?cXVueDQrUEJLbzAxVTAzYWZMVjZzcUNqd1g0dzlMODFNRUdTNnlCTmZ1bEoy?= =?utf-8?B?cGpFRFd2MjE5RlZueVZpK0tlbm5TaDJJZ01lMzB3MjVpS0h6YW45QnczN3l5?= =?utf-8?B?c01oaUpMOStCUXNxd1dpbWdYek5DSHpXZkhYdktNcDNsU1VmMWVLeTdTVTdw?= =?utf-8?B?Q2tmZlJVdzZyMStnTUw3QVZNTzJDZEpoaHJDVHVXYS9Hd2s3R1RDVEFUMTJs?= =?utf-8?B?c29WVzVMZU84S1RoU1E3OFBhL0I0bThxSWswelRQQU9IdW9SZVlTcWNYK0cr?= =?utf-8?B?TFkwazVSSnBmRGcrVjVCSnF6K3JVbVk3R0tURnJnaVRiUDhURVhPYzNEalpO?= =?utf-8?B?Qm9iamlDQjJBZzNacG1NMGZUckQzOVpMQ1pLZjFUQkFmTU5BcGx1VkpaeUp5?= =?utf-8?B?ZlZRT2NJL2ViVTBPWlo3YWIwdDlNTFdtbnBRY2hWc0NIeWdlYkV1Vkptb3BY?= =?utf-8?B?bXJUMFQ4aGtkWGpuS21pZytFV2FLSEttcGJESjZkZkxob0phRk0vN2ZORGkw?= =?utf-8?B?WXBnUDhEK1VsenkremdKMVVMWUV2NkxtVXF2TmYrYkM1MHREcmtqZHZ6UDJD?= =?utf-8?B?UThlby92V1ZwQ3N5eDllUzFYUldYN3NsbjhGaVpxQzNFYlpxMVYvQnJKaHMy?= =?utf-8?B?bkkzbTQzdjFrNjQxNTdDSVEwVk8wOE1yODM5ZGYyNnQ5WVdiTXBpSVZ5Z3Z3?= =?utf-8?B?WW1xNURqZElWaS8wNFlmUVpaM01odG5vQkpkSTY4Tmhza2FPQ0ZmcEJtTEg2?= =?utf-8?B?djNmWFRpTEdMajNEQ2JZbmF4NkhXQytITVZadysxSmJvbEpoa3VlQUc3WDFW?= =?utf-8?B?T3ZvODBZN01nbGZYN2Nkc2djTDRiMlpISUhsY3VRU3FKYUxndUxZdzRqcDkw?= =?utf-8?B?ckh2MGFodnFOQnVZY2hIYjVCVFlabmRRNTZPSW1EeXNEVmZYTlRHYkh0U3hJ?= =?utf-8?Q?J+7WWv?= x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:LV3PR12MB9404.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(376014)(10070799003)(366016)(1800799024)(38070700021);DIR:OUT;SFP:1101; x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: =?utf-8?B?RjJVR2Q0YVdkM0pBVnNNTFNBN1RlY1FjQ2lnWC9ERHV5VWoxaG85cGI0R2hE?= =?utf-8?B?cXhhZDBjQ3NWOTZVUWN2dDlGdzFpY0w0S2Y5WTZtR1RSZGltck13Z1c4MlFw?= =?utf-8?B?YncwNkQ0VnhTaXIxRjdWRHdMekRUSnJXNzhwYUFHZjMvdG1qQjE0SjNjNXN5?= =?utf-8?B?U0VENE03YUYzc096eVVhZzJwSkppYTFhdEZNem55WncveUc2YlkxOHo1UWxX?= =?utf-8?B?TmxJUzl3dnNMT1JSUVhkTEEzbGczSnlETkxPYUNsb0d0RGczTW5qSkRDemJU?= =?utf-8?B?MnlNeElPaU9rem9QTGkzT3dvRGNZODR6eTNqZ1poZ0xtQkFNei9qRVhiQjUr?= =?utf-8?B?cTd3YUpVNUpWdEdtUXJZTzRPZjkyREpBRVY2SldEZkRUbE5HTzBNK1oxT2dY?= =?utf-8?B?TGlLT0VCWUpkN2NDM0VCL3Awa3MwczY3WHlEcVZ3RmFOdWlBNFk3WTd4K0dB?= =?utf-8?B?RzRsOHZETG4wcVJjUUVUeHFMV2ZKdHd4blhIdEpaemdCM2RseVpDVU8wdUkz?= =?utf-8?B?aU5KZFhvamt5NTFCK3UvMWp2N3h3YUdjMVBXRUhGbzAzZW5UOGhoQm4vRVhi?= =?utf-8?B?YWkvNGZOUWlzanN1UWpiSGpDNlFUamkyK0FDdERvZDhaUDFSemt0TG0rZlB6?= =?utf-8?B?YUdhQXJLakJieUdzWWdJU0gwNTNiUFAvWVNxcW5KQzR2MFAwVmVmYml0bEVY?= =?utf-8?B?UjBwVytUcjVuNVZCRzh1Z1FtZ3U0SmJ3UmlXRUN6RjMzSnlxSittUGQwL2lT?= =?utf-8?B?aytCTEpidlpzMkx2d1htaHJJNTRGQjhRVWxXUGc2SmF6Tm4zbUU3V29FaDl1?= =?utf-8?B?V01HNlJkM2N6cTk5c3hHbGpVRXFUOG5jbjBnNnh2YXB5K3VYOEtlYy9YMEFO?= =?utf-8?B?WWUrVFA0QTExMTZXVUJCTzNhckU0N09rUnhHZGFzKzNHTEt5bUhVSmNJVUlS?= =?utf-8?B?VnQ3QlhNOFVQNDNyZU40OWdKYWg4dU15bVhVaDR4KzdhTjk5a0ttWjFyU3lK?= =?utf-8?B?UnBlVW9FaTR2THRjaWxpMjRwbHlVR0dSdWtvZ1BlSlZZbkxXeFo1N2YzandM?= =?utf-8?B?OTNqeDYyYVVFaTN4eW44YU5XMlV1LzNMbnUzb3E0eVd5L0ZaOXd5clhxMUhE?= =?utf-8?B?Sm1OTHI3ZFFlV21RRUhJSTVxZitVTHZQRDh2b1R5SG1vK1g1ZjR1aGpST3ZB?= =?utf-8?B?aVFpQlVOZnRyZUFFQ2NPSmxZK0lMMHNUcWdLRmFHMTNFQVpndkoyZmZGSVF6?= =?utf-8?B?SVBxTm8xd3U5ZUFlRDJwNFhNRjlkTmZVNis2TnVDMEZDNlBNQVBTMTF0Zkxi?= =?utf-8?B?S1lLeEtXQnkzWHZZWXRJZ2NCRWRnT1pTY0NHblVBU2xkTTJtWmprNSs5Q0F4?= =?utf-8?B?TjdKdWdueUs1QWt2L0hMT09LMTYvdGQxcGNKUVY0Zkwxd2thQno4Wk5Ca3Rx?= =?utf-8?B?RU5KMStMV1pGWWVoYXVpSStTcU5MTDZYWkVpZmxLZW40TWFHRjBpeFpFK29Z?= =?utf-8?B?UG5DWFZHck1jSXBsK3BVaG9idkJzSVgzNEs2d1lXT0xhMFpYZUZ6di9MaDMz?= =?utf-8?B?cDRIVGxsNVIzSUk5YWxTbEl5dmJLL2R3V1R1bFo5WHg3Q2hBaUl0ZTBUdnFh?= =?utf-8?B?UzVUUVpBRzd3b2FFWTYyRWJSUHozQXVVUGxjMXBEVSttRmw0aWFpb2tQTThp?= =?utf-8?B?YzNZZmZxSHo2cWtMWFZpWGtIWkZvTkszZUppcE81a09lb2JFbmhFcEtLYmNs?= =?utf-8?B?WmlNOThKNTJ1Nk1CUlBNeDZCOUMxNjVqT0QvckFWOXNrdmQ3cnZEV00rWFJV?= =?utf-8?B?eHNITWkxZkptWEJ4RmRRL2lBaWpMZ2hHMmJmV3AwN05LMTJ6YVFxR3F3dE1a?= =?utf-8?B?U1ZBQTIrK3BiZytxV0t4VjFiblI0TXJUMy80dHkxOVR6US9FMThmVmtRQ3ov?= =?utf-8?B?NENFQUZwNDFxOEZBM2tQbmpMTWpEOHVzUndEbE9GUHErNlR4OGt6TzZHa2Zt?= =?utf-8?B?TDc2VUZod3k4Z1lESHBkaFNqZXQvdVdjT2dIVGFCOERiSmJvVVJlT1BGbHZV?= =?utf-8?B?eXE5WXFEYk1RckJhYkRMWFBkOTBHK0YwTEVvS1dqWkFXVzBzd1JUVk5ES25Z?= =?utf-8?B?QXVMN0ZJVlZGSzFtNG4rTmMvcnJraVVNdWwyQnI3WVVRYWk1VGwxeWlYS0Ey?= =?utf-8?Q?ITvR6blipJ7UuRp7RmGpznQ39NVCmH3wXfK7UcQUqFQ4?= Content-Type: text/plain; charset="utf-8" Content-ID: <4997B87FE91EA2439FB07EBA167CE72A@namprd12.prod.outlook.com> Content-Transfer-Encoding: base64 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: LV3PR12MB9404.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2b941065-d3ea-4992-65c9-08de1cea5544 X-MS-Exchange-CrossTenant-originalarrivaltime: 06 Nov 2025 04:09:51.1058 (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: /JeIUt7kzXqWIZa34P9cv7lw2ak6o6UYVuQpt8SRmTgxUlZjslnZDKmmmXTinlPGBjYKJDmK/xgANeMiP4mQXA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8075 T24gMTEvNS8yNSAxNzo1NCwgS2VpdGggQnVzY2ggd3JvdGU6DQo+IEZyb206IEtlaXRoIEJ1c2No PGtidXNjaEBrZXJuZWwub3JnPg0KPg0KPiBBbGxvd2luZyBieXRlIGFsaWduZWQgbWVtb3J5IHBy b3ZpZGVzIGEgbmljZSB0ZXN0aW5nIGdyb3VuZCBmb3INCj4gZGlyZWN0LWlvLg0KPg0KPiBTaWdu ZWQtb2ZmLWJ5OiBLZWl0aCBCdXNjaDxrYnVzY2hAa2VybmVsLm9yZz4NCg0KDQpMb29rcyBnb29k Lg0KDQpSZXZpZXdlZC1ieTogQ2hhaXRhbnlhIEt1bGthcm5pIDxrY2hAbnZpZGlhLmNvbT4NCg0K LWNrDQoNCg0K