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McKenney" Subject: [PATCH 1/3] lib: add "all" and "none" as valid ranges to bitmap_parselist() Date: Thu, 21 Jan 2021 17:33:53 -0500 Message-Id: <20210121223355.59780-2-paul.gortmaker@windriver.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210121223355.59780-1-paul.gortmaker@windriver.com> References: <20210121223355.59780-1-paul.gortmaker@windriver.com> Content-Type: text/plain X-Originating-IP: [128.224.252.2] X-ClientProxiedBy: YTOPR0101CA0047.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b00:14::24) To DM6PR11MB4545.namprd11.prod.outlook.com (2603:10b6:5:2ae::14) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from yow-pgortmak-lx2.corp.ad.wrs.com (128.224.252.2) by YTOPR0101CA0047.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b00:14::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3784.11 via Frontend Transport; Thu, 21 Jan 2021 22:34:22 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 25de5695-07af-473d-b99c-08d8be5cb357 X-MS-TrafficTypeDiagnostic: DM6PR11MB2763: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: aYvjVLQrfD5rWM8NmGM979QPOODALgp5z2u6IA6g3slG1/FCnC4WJnSaiL8TEvJkiLNSVhO9lBXfeBKIMweH/IUE15zQct8bNlsQOC6asbB4L09cswniIYM1jlrGdeylR2vxKAtb2iagrK580ExIV1DC1UJLtkOCFPGqTMdThzYxC+/OHTGL1H4NEqO4avMWd7Qa/AT9MESVV8ix3fDoAOT/ZE49C1eehqm0WJKHMo6mIU9/ItAOC00PsgcBjtjWyfrYg73tGZrGwB0a0D7HRwcMxPomYS2P4oLLFrVbeEm9Lv1fY6vf9iILRK2ITh4hmVWS66yHB4pTMIbkafqMmNNRTmdcG7Tz4t3hZ+s/CuM8bz6pZExzR3pk756yUMZ+QyAIF41qmhMR7gzEJxx0rg== X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM6PR11MB4545.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(366004)(376002)(39850400004)(346002)(136003)(396003)(4326008)(66556008)(66946007)(8676002)(478600001)(6666004)(8936002)(6486002)(86362001)(66476007)(6512007)(36756003)(1076003)(44832011)(2906002)(2616005)(6916009)(83380400001)(316002)(26005)(5660300002)(54906003)(186003)(956004)(52116002)(16526019)(6506007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?YwGpi+zioShTYj1nAvKsOKkxSydV7wWkXgopSaTRuA2lPw1EvnvKC4/W2LmO?= =?us-ascii?Q?tVcuLkwH7P4UUfvQxve3mcgbnzs7iZp18SnZbhXI/Rw/GIcXh5OCRhQGCWaw?= =?us-ascii?Q?DxVR4Ia0wu4jpxDj5koZiNWytqekYwuHbV1eDltu07ximTJpBTPMSPiRGmjC?= =?us-ascii?Q?g1Cpdk4g+AYMe0RUmZXpwIMIio1QvH90pcmw+bghHjCQaiNmJ7EeaSNnGaZ5?= =?us-ascii?Q?WoBmnE35QNFH8fj5jFkwk2a8Y6dOHVxSBVfcJJthC6c3S56403LEAsDEFwvZ?= =?us-ascii?Q?JTSLa6k6QEeNSyK3k9hH2AVC0aYR10SB8BJ5N9GgbTDGiBXTXUcsWXxOaKVF?= =?us-ascii?Q?uOniFdsMW6hgWuDnJX1V6EeWJDHqnY+J66viigT4YDxPYvT4oUMo08El16Jx?= =?us-ascii?Q?0dCdCk+0Y9E5qa+Bx/ERruzVBDY2tMO9aVhQiiN2QHhcjrtfoMDkPBC3UXj1?= =?us-ascii?Q?LyxZs8s7tS1S5i7G1TJYD+bReCBiDjD9BdqYGOw3brVWNyb/D7JTLm+q4twn?= =?us-ascii?Q?cd5gCarTrWgS0AZhMhQjuR3gNtYp6OH+XXEwRx6bX4m+eIKfkQ0axWlFNw4e?= =?us-ascii?Q?w3tcknuskr8sw4cXWAASx/8lDUPpMQMJsIgshbbmRedYVuFPcwQdBnxD3dkM?= =?us-ascii?Q?LZ7UakCa5I9gL3/qxbKCFPxulacn+qR1bBbAAd03hEaWHr8BItqygsYF4qOL?= =?us-ascii?Q?wzogRceO6JHS1fCQ1jil+phrRIGCK1YY5Uvwa8FDrB3WFQDq5hi1tw3eNqvJ?= =?us-ascii?Q?eGWIfIeBVgOfyQbTA4b98r3zrHd7ztvDXaVNxVr1kaO0QuXWKLzxWNXlRFM7?= =?us-ascii?Q?uBC+UC+DcAwPJepbvkdQjpoo50HCaDlpOKmtVo1uHFv2Wd8Nk7GZN7LAQk7a?= =?us-ascii?Q?OYYyO+6bWQpuMZQBS3roT+pEC/Y104nAYjdDqaZ2asl7WVED+KNhunvJbUJ6?= =?us-ascii?Q?DQdhMQv+NtSm46XzT5W5cRcoIbPFiQzbb326iBY+67H7tcQHSLYZaSvEkVak?= =?us-ascii?Q?OCqr?= X-OriginatorOrg: windriver.com X-MS-Exchange-CrossTenant-Network-Message-Id: 25de5695-07af-473d-b99c-08d8be5cb357 X-MS-Exchange-CrossTenant-AuthSource: DM6PR11MB4545.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Jan 2021 22:34:23.0036 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 8ddb2873-a1ad-4a18-ae4e-4644631433be X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: ylfuRKQtcyrVqeV4LkmsEiAxqs7oBNnl9mFDMVL4a5oc5UCXN6OCXTtU64TxAQPBijEAo/36Op6OMSIjyMO5Gtr82nMusIcI7OhXhEsevDs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR11MB2763 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The use of "all" was originally RCU specific - I'd pushed it down to being used for any CPU lists -- then Yuri suggested pushing it down further to be used by any bitmap, which is done here. As a trivial one line extension, we also accept the inverse "none" as a valid alias. Cc: Yury Norov Cc: Peter Zijlstra Cc: "Paul E. McKenney" Signed-off-by: Paul Gortmaker --- Documentation/admin-guide/kernel-parameters.rst | 11 +++++++++++ lib/bitmap.c | 9 +++++++++ 2 files changed, 20 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.rst b/Documentation/admin-guide/kernel-parameters.rst index 682ab28b5c94..5e080080b058 100644 --- a/Documentation/admin-guide/kernel-parameters.rst +++ b/Documentation/admin-guide/kernel-parameters.rst @@ -68,7 +68,18 @@ For example one can add to the command line following parameter: where the final item represents CPUs 100,101,125,126,150,151,... +The following convenience aliases are also accepted and used: + foo_cpus=all + +will provide an full/all-set cpu mask for the associated boot argument. + + foo_cpus=none + +will provide an empty/cleared cpu mask for the associated boot argument. + +Note that "all" and "none" are not necessarily valid/sensible input values +for each available boot parameter expecting a CPU list. This document may not be entirely up to date and comprehensive. The command "modinfo -p ${modulename}" shows a current list of all parameters of a loadable diff --git a/lib/bitmap.c b/lib/bitmap.c index 75006c4036e9..a1010646fbe5 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -627,6 +627,7 @@ static const char *bitmap_parse_region(const char *str, struct region *r) * From each group will be used only defined amount of bits. * Syntax: range:used_size/group_size * Example: 0-1023:2/256 ==> 0,1,256,257,512,513,768,769 + * Optionally the self-descriptive "all" or "none" can be used. * * Returns: 0 on success, -errno on invalid input strings. Error values: * @@ -640,8 +641,16 @@ int bitmap_parselist(const char *buf, unsigned long *maskp, int nmaskbits) struct region r; long ret; + if (!strcmp(buf, "all")) { + bitmap_fill(maskp, nmaskbits); + return 0; + } + bitmap_zero(maskp, nmaskbits); + if (!strcmp(buf, "none")) + return 0; + while (buf) { buf = bitmap_find_region(buf); if (buf == NULL) -- 2.17.1