Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: [PATCH RFC v3 21/21] cpumask: Add enabled cpumask for present CPUs that can be brought online | Date | Fri, 15 Dec 2023 20:40:28 +0100 |
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On Wed, Dec 13 2023 at 12:50, Russell King (Oracle) wrote: > From: James Morse <james.morse@arm.com> > > The 'offline' file in sysfs shows all offline CPUs, including those > that aren't present. User-space is expected to remove not-present CPUs > from this list to learn which CPUs could be brought online. > > CPUs can be present but not-enabled. These CPUs can't be brought online > until the firmware policy changes, which comes with an ACPI notification > that will register the CPUs. > > With only the offline and present files, user-space is unable to > determine which CPUs it can try to bring online. Add a new CPU mask > that shows this based on all the registered CPUs. > > Signed-off-by: James Morse <james.morse@arm.com> > Tested-by: Miguel Luis <miguel.luis@oracle.com> > Tested-by: Vishnu Pajjuri <vishnu@os.amperecomputing.com> > Tested-by: Jianyong Wu <jianyong.wu@arm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
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