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 | org.kernel.vger.linux-ia64,dev.linux.lists.acpica-devel,dev.linux.lists.kvmarm,dev.linux.lists.loongarch,org.infradead.lists.linux-arm-kernel,org.infradead.lists.linux-riscv,org.kernel.vger.linux-acpi,org.kernel.vger.linux-arch,org.kernel.vger.linux-csky,org.kernel.vger.linux-doc,org.kernel.vger.linux-kernel,org.kernel.vger.linux-parisc,org.kernel.vger.linux-pm |
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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]>