From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.20]) (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 EDF8B24113C; Thu, 12 Feb 2026 23:04:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=198.175.65.20 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770937495; cv=fail; b=HkrUKRjvwKIQppwDqSV0GIKv94pjtNdZ6RMXaN9TQBuSOQNRBLA57JkMUX+h2TbDY5TmvKSQATRXHVAYugbqfP/+dswB5nVKZmMruvNbWmkk3lpXuLFudzkvMZfh6zjXDQP0t2N67x6oALMUCZkiZ1JGM8Mn1ESmJmrjYQ3S+QU= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770937495; c=relaxed/simple; bh=LTyBRPWvyWZOsIxm2x5qY0PzIAmw/AQcEznUWsiKRUc=; h=Message-ID:Date:Subject:To:CC:References:From:In-Reply-To: Content-Type:MIME-Version; b=c59o1DyE+HElVLrQNcz8sa4+Uwv/uYRDAM82i64FopxMuIRGWkRwX8BmaaofYKNHn+y7muo3WvJ3qlqyFBWBLknJCfWxxgPRUBU+Jb/0KiFbebEWtvbIJk4s8kXmNjp1zbbr2oFOQXg+IQiAIr3Kx2tLE6jGPAOMA7vzPGw1fWs= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=ikYiDmxE; arc=fail smtp.client-ip=198.175.65.20 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="ikYiDmxE" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1770937494; x=1802473494; h=message-id:date:subject:to:cc:references:from: in-reply-to:content-transfer-encoding:mime-version; bh=LTyBRPWvyWZOsIxm2x5qY0PzIAmw/AQcEznUWsiKRUc=; b=ikYiDmxEkNA957qBs77m7SsmtwlT/AaE5BTiSVCdvZxcfCN7fF0FyyWQ Q5JYAgx2FwhNFjxr7+8Em2lgbk666irJCIqEz0spPzI1W+7ZdBcwDgcym zGHgWvLswF5ICnBlsA4uuS1qXJbxJkV5mYdt/wPkwGmnmiq6/+353mQo+ 6koTz6hrQ84raiS8FssrluT5wq07ZUOVGln0Cgct5o/kmAeKo94fpWVG0 agW31JErHhQ1JZlXEu/7FiXVvVgTFJLhFU9EBI0UbrDW2v5PsAV6n/g3E LAZzs9qo9AMSugCXMNnYpDRdifaRwpaxE+p6F/8VbmKjDJ3+8LO96JlfT Q==; X-CSE-ConnectionGUID: 2S1XvSE5SvGi6kGbWzJ5eQ== X-CSE-MsgGUID: xT7YaympRjeox1Bc7yErAw== X-IronPort-AV: E=McAfee;i="6800,10657,11699"; a="71837611" X-IronPort-AV: E=Sophos;i="6.21,287,1763452800"; d="scan'208";a="71837611" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Feb 2026 15:04:53 -0800 X-CSE-ConnectionGUID: QnMIN4BhQyeUak6hUPsCiQ== X-CSE-MsgGUID: 0g/j1A13RiSF4p3LxkTXFQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,287,1763452800"; d="scan'208";a="250427457" Received: from fmsmsx903.amr.corp.intel.com ([10.18.126.92]) by orviesa001.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Feb 2026 15:04:52 -0800 Received: from FMSMSX902.amr.corp.intel.com (10.18.126.91) by fmsmsx903.amr.corp.intel.com (10.18.126.92) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.35; Thu, 12 Feb 2026 15:04:52 -0800 Received: from fmsedg903.ED.cps.intel.com (10.1.192.145) by FMSMSX902.amr.corp.intel.com (10.18.126.91) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.35 via Frontend Transport; Thu, 12 Feb 2026 15:04:52 -0800 Received: from BL2PR02CU003.outbound.protection.outlook.com (52.101.52.36) by edgegateway.intel.com (192.55.55.83) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.35; Thu, 12 Feb 2026 15:04:52 -0800 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=Opu6AKPgHQ+BAvHji/RaeZRjfW8GGMLj9h+aVLGOJ22rZP0JFfD5LYrTrBxI+W7iUmVndULk+vzRbqDiHFABr+YaMdf7nD0yRD2dO3++uQZLS/zvNxjyPgDJwYJQsZUY4Gt5HtmWOicxkMT6HdVPh/JzI9trpnrLNPV91Q4ldNVraiG8r/D/g03U7+DV6ZfIt4oSRQLlcOep+tLi6BkeiFzP+NJ2W/wPTOvm0W2NbmCJoQNaPofi5vEBc5dQza2c+lYipKwFtvssTt9rpd8g2Bh0Dm4iFQxejpDTLYzE8juXt7euN58OnlnnakxEQICqDty3FDOyeug+1tfUNXM/DA== 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=s3Wa+83+SVDvDxG3EyI6uNh8BJMF1peQnLoO6BrVDog=; b=YQYjZPqvw1Z2dcangGhyTLgmgWHZ8ylIC6oD9PKa7KWeZvbDOH12JXDyKXXt3rAujtgwH8aX/nS8oEnoMcsrURygiwKhoEUqYnEbXpy0bYPttct+cSFJSXyyWSVYuwMrnknZUCv/YRJ7EkCJX6ZuJ/31mu5XuZXq6tRMFLJKZbwQD93wJQOzjzmKthzSia3ExVTR/N3tsnCfCmeAnttOqU4tSd3v0tDJub1Lx91rsBMakAWgRzsrb40xox9qiBMKxeSPu9OmpeIgyYtpAcx/3rAUj/SKWTXS9WpWbigd8G4dEpR2CyWtfE1f2WkluAHfKA9tkpltGFlMfmcxZsv/VQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Received: from DS0PR11MB7997.namprd11.prod.outlook.com (2603:10b6:8:125::14) by DM4PR11MB7758.namprd11.prod.outlook.com (2603:10b6:8:101::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9611.10; Thu, 12 Feb 2026 23:04:48 +0000 Received: from DS0PR11MB7997.namprd11.prod.outlook.com ([fe80::24fa:827f:6c5b:6246]) by DS0PR11MB7997.namprd11.prod.outlook.com ([fe80::24fa:827f:6c5b:6246%4]) with mapi id 15.20.9611.008; Thu, 12 Feb 2026 23:04:47 +0000 Message-ID: <19d3f1c8-01aa-4a50-81e0-6af3fb7fe9cd@intel.com> Date: Thu, 12 Feb 2026 15:04:44 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 1/3] x86/cpu: Clear feature bits disabled at compile-time Content-Language: en-US To: Borislav Petkov , "H. Peter Anvin" , "Maciej Wieczor-Retman" , Dave Hansen CC: Thomas Gleixner , Ingo Molnar , , , Farrah Chen , Maciej Wieczor-Retman , , References: <32fbbfc16974cfed11e7d2651bce836ba9ceaccc.1770908783.git.m.wieczorretman@pm.me> <20260212155808.GDaY34kOTrEYHLdoyK@fat_crate.local> From: Sohil Mehta In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SJ0PR03CA0135.namprd03.prod.outlook.com (2603:10b6:a03:33c::20) To DS0PR11MB7997.namprd11.prod.outlook.com (2603:10b6:8:125::14) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7997:EE_|DM4PR11MB7758:EE_ X-MS-Office365-Filtering-Correlation-Id: 92af2a4c-6614-42a9-b4c8-08de6a8b1e32 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|366016; X-Microsoft-Antispam-Message-Info: =?utf-8?B?VjVsaHBva0NMNGZIYXRyWnAwT2d3MUpuTEZ4YnZmcE92OHEwZk5LZ28vNWI3?= =?utf-8?B?S2oxQWJ5ZnBYUjVaR1cwWHNFdTA3VXZhYkdxdlV0ekdzUmdQejlRYWFYM0Ev?= =?utf-8?B?R2ZiZytUbXVDNlh6TVhKNjdXQWpjTW0rbFlvY3JKRmE2YnVjc0JjaVR2OUVv?= =?utf-8?B?dXc2Smptb1ZOYm11dVU4ME5RdUhvdHVoWlVGbWtzZGg2THBtWE0rSUJTYnJ6?= =?utf-8?B?ZTRoNDREWlczWFdUTUlYSER2Snc5YjRCSHoxS0dyd2hBNGVSTjFIaFkzOHpo?= =?utf-8?B?aXd0OVBKRU5BcERzcXJDY0lJcjdkbEtXSEJvYnBFakd3Y1RVOWtiUHJXTkdG?= =?utf-8?B?WThKam1YelVuRlVVYXJ4Y3JYaFh3d1BKbjFNZlJDVEVBSkN4OU4zd2xLMDda?= =?utf-8?B?ZFJmNGlKOHBXdUNlZEdYd0FZZld3NExrSzE1VXlIaTNBYVRSd1I0OVd1eExC?= =?utf-8?B?SmgyeUFVNXpJaGtiTE5yMU9iRVRmUisyanZvZThMZnF1a0hXZjNidHRSRU5K?= =?utf-8?B?Q2JKQXY5UmVEVTFWdUhwK0Yrcjh4ckp3ajVZd3lVeGJqaklVY00zVDk2eERF?= =?utf-8?B?SnEwSjNHak9QRnpSeU9lM1kvUjR1S3E5S0tyRWFXNEp3NElLcEc3aHJoOTNx?= =?utf-8?B?d3VsMzRrU2xuV21TWjdTTGNUUDQ4NmVNd0FhMlFqemlKVEdTWS9CTTFaTFJr?= =?utf-8?B?ZjJ4eGlTSDJucTBldkhqMUtHUjd2RmQ1TFQ3NWZIOEtEZUVSK3VtRHNsdHhI?= =?utf-8?B?UEViS0pnVmZIZmd4VDRoalF2VFl5QVZ6NUF3WUFwWEN6by9LdGVPTmczaTVy?= =?utf-8?B?WmMyQVg2YW9yek5wbENmcGRRVjVRQ1AxUWJkOHJpNGFxUDZQUnB3TW1pTE1z?= =?utf-8?B?aXRUTENpTlVzZ09VblR3SjF5QzlUc0wzSjk2bHRnMDRTTmJWUUhjTDBqc2oz?= =?utf-8?B?RDdDNXEvd1QrdHZjb0JJSVArNC9icGhrN2dKQVRaWVVpeUZzWmhpVEFzTVJ5?= =?utf-8?B?cmJTN0dyN2h4SlZZNlYwY01SRlU5V2UwSWQxdXlnVmZEWkZlRDFMYm1iYklr?= =?utf-8?B?QURRSXM4WnNtenVLdys4UnlqTndmay82cTcySjE5Tzk4d0RlWlNiWkVQUWM3?= =?utf-8?B?TDZEdFFROWxXaEh5MjdpSWtoY1dhTXMrRWd1aWNhQjc2b0wvM1ZLWUlhOUNk?= =?utf-8?B?RWhmWUFtU0laTjFvV3EzN0t1aWdxNjMxb0dzdmRtY2o1N09qN0wzWDhQQkx3?= =?utf-8?B?WitRRTFDT1NHeTZOVW1zcU1EdHdqKzZSUEFESlgzRDNOUnVSenZxTTJEd2d3?= =?utf-8?B?RzYxSU12cGRvOThaK0FWQTZWVHZPd3JrWUsvSnVGeTRYVExHK3pDOTZOUExp?= =?utf-8?B?QnhIUTQ5aGpkYVpZNDFEbm1aUTh5eWJiWEZLdDlGR2tpZ21nUjZnUmxTS2hl?= =?utf-8?B?cEl1bUd6Rnk5T1ZJY3VSK1dJaWlGMmcyNVoxM2l4V3hDOWFaVXR1QTNNNE1H?= =?utf-8?B?UjUzT2pVU3lDSU90Skx3V2hIRlNEQWZ0TXBDd3ZadDAyZDNLVnFKNXZON2Y5?= =?utf-8?B?TkxLMXhlWkQwblJQZiswQ0lnMnR2aWVWdlM5eEwzMHA2SFNubW1Ndml6bnIr?= =?utf-8?B?V3FHSXp5REdWVE1rblZMenpaSlJYczNBZ2RCdnFuVWt5UGdCbFI5RkNxTE9G?= =?utf-8?B?NHArcjVycmdjZ0ZRcmUzU1pFWjRjRlZ2eEVXbitQTnZIVG83OW5OTFpiRGlz?= =?utf-8?B?em03NUo5NzFQS01GVnpxcm1xSFgrN2xrVkFJWWZSenBVYUNPbkVCOFg0UE8z?= =?utf-8?B?UUsrS2p4ODE4RWs2MDVTelRSZURST3N4NExNOUhOWWhWZ2FhOWtqZUtMbG81?= =?utf-8?B?V2xHSVdaaTMyS1k2M2ZRWTB1V0FTMmxyakgzT0RoeXVHV2tsRHlwZXI5ZW9j?= =?utf-8?B?ancwK2MvdHZTM2JIYVlBbzR6WWZHeUF0enFhdDRPM3hVZnFNRmNmRGVMOWdx?= =?utf-8?B?bXBVWFo2Nkl0aUpRZjFZdmJha2ZDOEEzcUc3cWpqZXBpaWpJWndEaFljT0Zr?= =?utf-8?B?VUpIWmdydCtaYmpaek9rU2hQUUdtcldkVDd3NXRYdnN6NkszVXp2OXphM3k2?= =?utf-8?Q?OL+8=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DS0PR11MB7997.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(376014)(7416014)(366016);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?bk5zS2ZKeUF4bXAyTVdVamFmL2RuUDZoaEhYZGtJQVoyR0lQMTBzNm52SEtN?= =?utf-8?B?V3VHUi9WM25HUENNNjJWSEVSOFh2Mnh5TS8vRmQxNGhPeWtnNHFkQkxaNzlN?= =?utf-8?B?SXk3a1pNejZOUi8xT0RGYWJQV2JKaGh4K29OMnIyM0hDaTNYaUF0QksvZ3J1?= =?utf-8?B?NTJDNkdrZEJpUlBkQk13MVBibTlKcm1JaUw2a0QxOGUyUFdsSWt1a25uUXB3?= =?utf-8?B?RU4vNWRsSDJKYzVTb0ZkTUppRGorVGo0T0FhUWRnU0lYSjJrVXY3Y2dIZUxj?= =?utf-8?B?RkgwR2dzWDRMUXpqZ2RPaVN0NkFaaWl6SDNUOVdFTXZtQlZmZ1RQcytQT2U0?= =?utf-8?B?eDhWSERQdWZYSVdjL0RkdU4zV0txREY1OGlJZDJaaUpsNzRuV3dPS3EwOCtY?= =?utf-8?B?bG5DejlvcnFXSXpJblhHOHRXbGJIbGlMZ0lSSEZrcm9MaUNlQ1BWekZWbmov?= =?utf-8?B?LzFwYkNsNFdRWTIySHBUdFRaM0I4VVNuMVlKY29FVTZ1WnFJdm42TDV0SEVh?= =?utf-8?B?Zlo4U1FPazN0SVU4ZXV1YmpYMlc2RWtKSEtiTEkzb3ZTY0JyMnZMb3BGcXJK?= =?utf-8?B?VFBVRzlnZFNxSzNoYWxRUFUxUUV6UTBRRmp3Zmp4UkJVZmpPSk93ck5BRzBG?= =?utf-8?B?Ni9MK3Y1dk9NeitpcmxIa1RoYW9teXBPcENVZjNXY1AzS2FNQ3M1dytud2J0?= =?utf-8?B?N0JEV3NDZnk3YjFqWW5XaUVPQS8wV0Y3bGpGMTlKY1ZPcEQyYmlHdEJlVGpU?= =?utf-8?B?NS93TFZQNXJjanY3eVRvRVlCNC9CakpGRWZxcmVDTEU2M1pYYU5GT09IM2hV?= =?utf-8?B?ZGJxZ2tXbDZOWGRYa3hGdlBGVGpmU1pzOE96aDB3NmJ4WHUxakdaWjVzOGxE?= =?utf-8?B?bVRkVVFGZ01BajR6RzhtODd4UFRrbWNrbUhRRjJaNmJJcXhTckdCL05OY2ln?= =?utf-8?B?T2oxRUFKMFhpbU1JaGkyWjRhNXp6b1o1UkZjZ1RSODVoYzNDdXpsSHFvSlNt?= =?utf-8?B?NmxVbml2NEl4eUx5UDJHRmxvR3VhcFl1UmYraDhMWEI0dm1CQzVqMHpFTmFH?= =?utf-8?B?N2F1NElTbVZQNGFPT1dxV0hGaXNwNG9FazJQS0had2czYTdOWE9TanFqSVhD?= =?utf-8?B?dmxCaTR1Z1J4N2dmRUF0R1dZR3cyWUtUUXhTUnovVVA2S1FwU0tCem9saHV1?= =?utf-8?B?dVpIYjZITXF5T0cybW5RWEcxbEx0VUhQNWErejlXK0hUVmVZL05wMkZRc3ZN?= =?utf-8?B?b1RqTFhXR1haQ0EzeXFjSVp3dldOUXl2c1lTcU9IL1Jqcm9wMVdYMlNKZDNN?= =?utf-8?B?NEpkT1NDb1pGUVNQbk1JTTZFRUZVVStYQ0xJT0p2Qm9xaVdOTTJ0WEJuQlRp?= =?utf-8?B?NmVxc2tzYTNKWXZnVEFHYkkxUzFMSUppOENXbkwrR0NBRGowaVNuTGtSdlNF?= =?utf-8?B?TjNJOG5XbFdRMWJVTWZMSE5iYmMyQzQ2dlpnbGRxcm1oZGltZmg4QU5HbWRM?= =?utf-8?B?U2FiSGxBaTBpOXVYN0Rsa0ExQzZ2L0c4Sm83cEdiaEQ1MHlUVUxGdnlRenZq?= =?utf-8?B?V2ZPbVdoSkE3bEZmbzl6MHAxYzd3Rk5reUk0VWJiQ0phNkgwdEJmTDVsOG5L?= =?utf-8?B?Q0MyWTU3T3RMWHBiOXBCUThhNFBaTHpaTmRxNHFXcU1NNWlmZnByb25MVjRT?= =?utf-8?B?ZEY5L3FwMGw1YkVEWm1RVWZ5c1FXVDVFL0I4VlVUOE95elFrSlh6Q0FPbUV4?= =?utf-8?B?M1JaNm9uVHYzbDBXRTNUQjhzUEVnQUdLZkgvaWZHd0JXWW1weXBqV0xtZzhF?= =?utf-8?B?U1R3S2pmR2ZacmV5cUZsTy9ZSExRZ1pWRHBKV3d1UXFVQStkRWpZRC9RdXpV?= =?utf-8?B?NVlLNm5Vb1RZNkJOYzN2VUFoRGhRMmhhTWJ0cDNuRFZ2VGRyTVNPUld1Rm5T?= =?utf-8?B?Y3k5WVpNY0d4RXdEVEduRURZNVBJYzk5U2g3VlVHSjJvb1FjUU41YXUzU1Ny?= =?utf-8?B?bHYweFVLbGEra0lFandLemgyeUZUZUhER2FWdGRlY0hZV2h1Mmd2dEFzTmVU?= =?utf-8?B?dDF2ejZ5RCtDNk5jVEt4ck4yenpFN3ZaUUFiSVNYNVhZeXJKQWxUdkpJQmdM?= =?utf-8?B?b204TEJUYVpNeTZIQ2xtNU9FMER3M21xVzZpQUxsdkJzdm1zTEMvb1JncEl0?= =?utf-8?B?U2ZaSG9mVENBcW9vWFY3UEdUWFRNNjlKTkVXeGdFOWdZdlZyVTRjUFlYSCsw?= =?utf-8?B?YTZMTXdTR1RidjdmdEgrSktNNU9TS2hJMVp4aVptMldxVU5FMExTeTZ4SnM3?= =?utf-8?B?WnU0cG52SkQ5TVNUUUVoQ3hCNUxxUGhHVHg3ak1wMXpSeUhRbDJldz09?= X-MS-Exchange-CrossTenant-Network-Message-Id: 92af2a4c-6614-42a9-b4c8-08de6a8b1e32 X-MS-Exchange-CrossTenant-AuthSource: DS0PR11MB7997.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Feb 2026 23:04:47.4319 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: /VIjx3v/YaO9MPbGWGB/r+znqy2HpBKLz8pUBvojCmUaG/bMQXvHXr23lffph7Xr7NEJFjPI/NMTNPwkpPfu6A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR11MB7758 X-OriginatorOrg: intel.com On 2/12/2026 1:51 PM, Borislav Petkov wrote: > On February 12, 2026 9:34:31 PM UTC, "H. Peter Anvin" wrote: >> As the original author of the code I'm pretty sure that bug was always there. > > So, we don't need to backport it anywhere, we change it now in 7.0 or whatever and so be it. We can backport a documentation patch if someone is really pounding on it beint precisely correct for whatever reason... > > Can we just deprecate the "Flags" bits of /proc/cpuinfo at this point? No production software can be using this meaningfully. We have always said that the *absence* of the feature doesn't mean anything. The feature could be disabled or the kernel doesn't know about it. And now we've realized that the *presence* of the feature in /proc/cpuinfo doesn't mean anything either. Should we come up with a more thought-out mechanism for user space feature detection?