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

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Message-ID: <20240102151953.00001949@Huawei.com>
Date: Tue, 2 Jan 2024 15:19:53 +0000
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
CC: <linux-pm@...r.kernel.org>, <loongarch@...ts.linux.dev>,
	<linux-acpi@...r.kernel.org>, <linux-arch@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-riscv@...ts.infradead.org>, <kvmarm@...ts.linux.dev>,
	<x86@...nel.org>, <acpica-devel@...ts.linuxfoundation.org>,
	<linux-csky@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-ia64@...r.kernel.org>, <linux-parisc@...r.kernel.org>, Salil Mehta
	<salil.mehta@...wei.com>, Jean-Philippe Brucker <jean-philippe@...aro.org>,
	<jianyong.wu@....com>, <justin.he@....com>, James Morse <james.morse@....com>
Subject: Re: [PATCH RFC v3 21/21] cpumask: Add enabled cpumask for present
 CPUs that can be brought online

On Mon, 18 Dec 2023 12:14:14 +0000
"Russell King (Oracle)" <linux@...linux.org.uk> wrote:

> 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@...linux.org.uk> wrote:
> >   
> > > From: James Morse <james.morse@....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@....com>
> > > Tested-by: Miguel Luis <miguel.luis@...cle.com>
> > > Tested-by: Vishnu Pajjuri <vishnu@...amperecomputing.com>
> > > Tested-by: Jianyong Wu <jianyong.wu@....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).
> 

That's always a guess at best.  Hopefully whoever picks this up
fixes the date up or asks for a new version with it fixed just before
they do.

J