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

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Date:   Sat, 4 Dec 2021 09:07:12 +0000
From:   "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Brice Goglin <Brice.Goglin@...ia.fr>
CC:     Peter Zijlstra <peterz@...radead.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Jonathan Cameron" <jonathan.cameron@...wei.com>,
        Len Brown <len.brown@...el.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Ian Rogers <irogers@...gle.com>
Subject: RE: [PATCH v2 0/3] topology/sysfs: only export used sysfs attributes



> -----Original Message-----
> From: Greg Kroah-Hartman [mailto:gregkh@...uxfoundation.org]
> Sent: Friday, December 3, 2021 3:27 AM
> To: Heiko Carstens <hca@...ux.ibm.com>
> Cc: Peter Zijlstra <peterz@...radead.org>; Rafael J . Wysocki
> <rafael@...nel.org>; Andrew Morton <akpm@...ux-foundation.org>;
> linux-kernel@...r.kernel.org; Jonathan Cameron <jonathan.cameron@...wei.com>;
> Len Brown <len.brown@...el.com>; Thomas Richter <tmricht@...ux.ibm.com>; Ian
> Rogers <irogers@...gle.com>
> 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@linux.ibm.com/
> > > >
> > > > 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@...radead.org>
> >
> > 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