RE: [PATCH v2 0/3] topology/sysfs: only export used sysfs attributes

[Song Bao Hua (Barry Song)]

> -----Original Message-----
> From: Greg Kroah-Hartman [mailto:gregkh@xxxxxxxxxxxxxxxxxxx]
> Sent: Friday, December 3, 2021 3:27 AM
> To: Heiko Carstens <hca@xxxxxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>; Rafael J . Wysocki
> <rafael@xxxxxxxxxx>; Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>;
> linux-kernel@xxxxxxxxxxxxxxx; Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>;
> Len Brown <len.brown@xxxxxxxxx>; Thomas Richter <tmricht@xxxxxxxxxxxxx>; Ian
> Rogers <irogers@xxxxxxxxxx>
> Subject: Re: [PATCH v2 0/3] topology/sysfs: only export used sysfs attributes
> 
> On Thu, Dec 02, 2021 at 03:22:05PM +0100, Heiko Carstens wrote:
> > On Mon, Nov 29, 2021 at 03:03:18PM +0100, Peter Zijlstra wrote:
> > > On Mon, Nov 29, 2021 at 02:03:06PM +0100, Heiko Carstens wrote:
> > > > v2:
> > > > As requested by Greg KH: avoid negative logic and use uppercase defines.
> > > >
> > > > v1:
> > > > Create die and cluster cpu topology sysfs attributes only if an
> > > > architecture makes uses of it, instead of creating them always for all
> > > > architectures with bogus default values.
> > > > Also change the book and drawer cpu topology macros so they match all
> > > > all other topology macros.
> > > >
> > > > v1:
> https://lore.kernel.org/lkml/20211128212221.1069726-1-hca@xxxxxxxxxxxxx/
> > > >
> > > > Heiko Carstens (3):
> > > >   topology/sysfs: export die attributes only if an architectures has
> support
> > > >   topology/sysfs: export cluster attributes only if an architectures has
> support
> > > >   topology/sysfs: rework book and drawer topology ifdefery
> > > >
> > > >  Documentation/admin-guide/cputopology.rst | 33 +++++++++++------------
> > > >  drivers/base/topology.c                   | 28 ++++++++++++++-----
> > > >  include/linux/topology.h                  | 25 +++++++++++++++++
> > > >  3 files changed, 62 insertions(+), 24 deletions(-)
> > >
> > > Seems entirely reasonable to me,
> > >
> > > Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
> >
> > Since there seem to be no objections, who should pick this up?
> > I'd assume the s390 tree would not be appropriate.
> >
> > Andrew, Greg, Peter?
> 
> I will take it, thanks.

Could you give me one minute?

+Brice

I'd like to hear some feedbacks from hwloc if there
is a chance to break userspace and if userspace depends
on the existence of sysfs even though the topology
doesn't exist.

If no, I feel it is safe to take.

> 
> greg k-h

Thanks
Barry