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Thu, 14 Aug 2025 21:52:00 +0000 Message-ID: Date: Thu, 14 Aug 2025 14:51:57 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 24/32] x86/resctrl: Add energy/perf choices to rdt boot option To: Tony Luck , Fenghua Yu , "Maciej Wieczor-Retman" , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Chen Yu CC: , , References: <20250811181709.6241-1-tony.luck@intel.com> <20250811181709.6241-25-tony.luck@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <20250811181709.6241-25-tony.luck@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4P222CA0024.NAMP222.PROD.OUTLOOK.COM (2603:10b6:303:114::29) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|PH3PPF5A636EDE4:EE_ X-MS-Office365-Filtering-Correlation-Id: 2c195760-7123-493c-f1d3-08dddb7ccbd3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; 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These > may be overridden by quirks to disable features in the case of errata. > > Users can use kernel command line options to either disable a feature, > or to force enable a feature that was disabled by a quirk. > > Provide similar functionality for hardware features that do not have an > X86_FEATURE_* flag. > > Unlike other features that are tied to X86_FEATURE_* flags, these must be > queried by name. Add rdt_is_feature_enabled() to check whether quirks > or kernel command line have disabled a feature. Just like the legacy > features the command line enable overrides quirk disable. I am not able to parse the last sentence. > > Signed-off-by: Tony Luck > --- Reinette