Re: [PATCH RFC v3 21/21] cpumask: Add enabled cpumask for present CPUs that can be brought online
Thomas Gleixner <[email protected]> Fri, 15 Dec 2023 20:40:28 +0100
| Newsgroups | gmane.linux.ports.ia64,gmane.linux.power-management.general,gmane.linux.acpi.devel,gmane.linux.kernel.cross-arch,gmane.linux.kernel,gmane.linux.ports.arm.kernel,gmane.linux.ports.riscv,gmane.linux.documentation,gmane.linux.ports.parisc |
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| Message-ID | <87le9vmez7.ffs@tglx> |
On Wed, Dec 13 2023 at 12:50, Russell King (Oracle) wrote: > From: James Morse <[email protected]> > > 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 <[email protected]> > Tested-by: Miguel Luis <[email protected]> > Tested-by: Vishnu Pajjuri <[email protected]> > Tested-by: Jianyong Wu <[email protected]> Acked-by: Thomas Gleixner <[email protected]>