Re: [PATCH RFC v3 21/21] cpumask: Add enabled cpumask for present CPUs that can be brought online

Russell King (Oracle)
2023-12-18T12:14:30Z

On Fri, Dec 15, 2023 at 05:18:31PM +0000, Jonathan Cameron wrote:
> On Wed, 13 Dec 2023 12:50:59 +0000
> Russell King (Oracle) <rmk+kernel@armlinux.org.uk> 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>
> > ---
>
> Needs docs
> Documentation/ABI/testing/sysfs-devices-system-cpu
> seems to have the rest of the similar entries.

Any ideas what I put in there as "Date" ? It seems to me that we have
little idea when this might be merged.. I could use the date of the
commit (Nov 2022).

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