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Bae" , x86@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 0/2] x86/topology: add bitmap_weight_from() and use it in topo_unit_count() Message-ID: References: <20251222191140.380498-1-yury.norov@gmail.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: BN9PR03CA0352.namprd03.prod.outlook.com (2603:10b6:408:f6::27) To PH0PR12MB8800.namprd12.prod.outlook.com (2603:10b6:510:26f::12) 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: PH0PR12MB8800:EE_|BY5PR12MB4227:EE_ X-MS-Office365-Filtering-Correlation-Id: 180309ce-aecc-4904-9cdb-08de8151cde7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|10070799003|366016|1800799024|376014|7053199007|56012099003|18002099003|22082099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PH0PR12MB8800.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(7416014)(10070799003)(366016)(1800799024)(376014)(7053199007)(56012099003)(18002099003)(22082099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?Vyaob4qmPibgHg9ge7xNSyCG/w6Fr6z6Rd8h7C/XE/TjUYaJJL7bSk1/8J9a?= =?us-ascii?Q?KW/tMZle25/8oLJ7QX2EDTVi5wSZm95RgtzCf4nRpy0xazGQCU9kEQcNj+tm?= =?us-ascii?Q?XlJ5lKViPvaLDTFmT2bsqmXjDKt8+QX93bG1+ODlCaVUST+OyjJVU4BhIh7w?= =?us-ascii?Q?uguNSqMmc221EZxgU3WnsuZvRwSKjmqX8Kju6EMAXLhgTYfRyjKWZyQANgB5?= =?us-ascii?Q?Xp4s429iWEZuwbBiWN3QzPZhHFFsRVX4itnvu2rphiWGk65ON4ui/FvB8IoC?= =?us-ascii?Q?njqkWKVZ2xd94ftLXEUZYtiYP/FrDBq4YvAWitggvu90u1/dRBCef1Y/nR85?= =?us-ascii?Q?AjlhTXFmVzykCzmiQeHDiKJJ4tMtUkvVZqj7xSr4lSirwYPnBzjY+ZN/udJ/?= =?us-ascii?Q?kNo0fSD4WDLKJyrYpWGuULuqb4b2Qb9COG8SVi1XmXexeZF7+mGViP7aBg2S?= =?us-ascii?Q?Gf/G3jk+5TET8Nntszvl9WwRuoO4JLKxcnuR+5CmOm77EL1Ob3KH+Xt+57aN?= =?us-ascii?Q?ZxXK/hRKk6NBpePzZ7CUnoHC6RB/+JNVoXjrZTYDnzMao3E/PZcgduZdDRU8?= =?us-ascii?Q?moloSBN+aRzOoxCnvr1FO1Sv1Xru7c6wMQ+lmEWUKYNKvdn9AfFLgC+anv6a?= =?us-ascii?Q?9wM9EQvGNjTqZX9x2vVpYjtWFk/L0tgJghYT+Y9XTrX1ugkYB22kup/406TP?= =?us-ascii?Q?dkPfWkyCfCZVsYnRc3Xt+o6IEn2xXrCPP8CnY2goSIE5G7rZ1OocMN9IfVQY?= =?us-ascii?Q?j9qjCODujlafqgzOrgxS4X/b7Ql32f/7e8sxutHNsg0UVu1bUWIGHiK1qCDC?= =?us-ascii?Q?TOi9B4t+DPtMSTEsJ93ncF7/ALEy1Bnc1X0axIDQ8P38/vMvuMeoFn+Hrs8v?= =?us-ascii?Q?WWRKTwhTpHbEtIHlW+ZBaWtWg+OdSfJXuAUyBgoPkL4LLgkDshf6RnnMqQJj?= =?us-ascii?Q?te2HktDaPYbzadxyRrLCMdeCZiPDqsQJzWBAH+HdNlakDvLAMxWCkHjCruU8?= =?us-ascii?Q?XlQj767uMUJUjgkSSA0CLUZEXg7WMmosfaUyyRP3xdiuX4acs8XaGrpqR/n9?= =?us-ascii?Q?2k5mA18rA7nqdut2dZEUj0WX3xKQ0SkjRjfRbzSFVe+oR4085slyumDVVe3W?= =?us-ascii?Q?lAWmRiewcDC2WySxh3B9PF+gK7uWDQZN2lF1//nCHqyLspY3qb8xebze9WPn?= =?us-ascii?Q?ePhGxdok3XoNKbbRT6kq0o8Fewf/IL1e7hOTlDJj8GASZiyiEw7t9uQJhvn6?= =?us-ascii?Q?R27sGiNJBGkNux+MLJ++bPWir2z174WI643fQoaWNi1IEGUYOqRi8oBLuOey?= =?us-ascii?Q?3xOOM9X1hcc+7Ykq+NsRVu5/3XE3Z5D4bmCj9I3/7kKFtlR2WqqMzrXp0dbd?= =?us-ascii?Q?cd/a+I+ZlN1M5wGzADNJ3MCWM9wmpknNjBz4G03XhoXcLgBRXlOGWVzWdq7k?= =?us-ascii?Q?EVaqB7mQiPrvM8uxPsC5QjEQ7INgvla2nxeDYjBQ+g6dhb4bOl1rlK61qqFF?= =?us-ascii?Q?zQ3mIkmEF/PGVKKvuCDTHTI64TxuqFsS2xMCGIxSEW10ofjdQbZKrSN7AxHo?= =?us-ascii?Q?7MNNF8qZtom6aT5Xdb4I+wbH5wj/GSG6bHDFy6SPMaRwY35fb4jaIx4f7En9?= =?us-ascii?Q?QZGIKbbhutUkbYjzVBizNLbDwkpY42wgqXuHIEwbSfiTklMrGk1ubutI1inl?= =?us-ascii?Q?6Xwud8Sz9c6APMcngAX87PpHYi5k4tGg6oQs/TufZKPOuoQdPu4EwB3sO+U/?= =?us-ascii?Q?ALMaaE1AH2Tr2NpeQLYM60ZW/WSKpWCVQieHAybeQolqGJ/22FvA?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 180309ce-aecc-4904-9cdb-08de8151cde7 X-MS-Exchange-CrossTenant-AuthSource: PH0PR12MB8800.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Mar 2026 22:42:28.1441 (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: x6aas6VIRi0DTGxExVV/XWxoe1IA/FO9vIaEZNYB+0t5/Lu+9l2ZZqyMcbgnSkAK9x6bHlVDLrD7oaXa3ZrZ2w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4227 On Sun, Feb 22, 2026 at 12:49:51PM -0500, Yury Norov wrote: > Ping? OK, if no objections, I'm taking it in bitmap-for-next. Thanks, Yury > On Mon, Dec 22, 2025 at 02:11:36PM -0500, Yury Norov (NVIDIA) wrote: > > Currently the function open-codes the missing bitmap_weight_from() with > > a for-loop, which is known to be less effective. Add the helper and > > switch topo_unit_count() to using it. > > > > v1: https://lore.kernel.org/all/20251214235437.244125-1-yury.norov@gmail.com/ > > v2: > > - rename 'nbits' to 'end' (Ingo); > > - leverage bitmap_weight() in inline implementation; > > - drop outline implementation; > > - don't handle 'start >= end' case explititly, leave it to user. > > > > Yury Norov (NVIDIA) (2): > > bitmap: add bitmap_weight_from() > > x86/topology: use bitmap_weight_from() > > > > arch/x86/kernel/cpu/topology.c | 8 ++------ > > include/linux/bitmap.h | 30 ++++++++++++++++++++++++++++++ > > lib/test_bitmap.c | 26 ++++++++++++++++++++++++++ > > 3 files changed, 58 insertions(+), 6 deletions(-) > > > > -- > > 2.43.0