linux-kernel - Re: [PATCH] perf/x86/uncore: Allow single pmu/box within events group

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Date:   Fri, 18 Nov 2016 15:30:48 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     "Liang, Kan" <kan.liang@...el.com>,
        Andi Kleen <andi@...stfloor.org>,
        Vince Weaver <vince@...ter.net>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] perf/x86/uncore: Allow single pmu/box within events group

On Fri, Nov 18, 2016 at 03:06:05PM +0100, Peter Zijlstra wrote:
> On Fri, Nov 18, 2016 at 02:48:59PM +0100, Jiri Olsa wrote:
> > On Fri, Nov 18, 2016 at 01:53:54PM +0100, Peter Zijlstra wrote:
> > 
> > SNIP
> > 
> > > ---
> > >  arch/x86/events/intel/uncore.c | 8 ++++----
> > >  1 file changed, 4 insertions(+), 4 deletions(-)
> > > 
> > > diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
> > > index efca2685d876..7b1b34576886 100644
> > > --- a/arch/x86/events/intel/uncore.c
> > > +++ b/arch/x86/events/intel/uncore.c
> > > @@ -319,9 +319,9 @@ static struct intel_uncore_box *uncore_alloc_box(struct intel_uncore_type *type,
> > >   */
> > >  static int uncore_pmu_event_init(struct perf_event *event);
> > >  
> > > -static bool is_uncore_event(struct perf_event *event)
> > > +static bool is_box_event(struct intel_uncore_box *box, struct perf_event *event)
> > >  {
> > > -	return event->pmu->event_init == uncore_pmu_event_init;
> > > +	return box->pmu == event->pmu;
> > 
> > this one needs to be:
> > 
> > +       return box->pmu == uncore_event_to_pmu(event);
> > 
> > and it works.. ;-)
> 
> Will that not explode if we fudge a software event in there?
> 
> Wouldn't:
> 
> 	return box->pmu.pmu == event->pmu;
> 
> be the safer option?

hum right.. but for some reason I can't crash it nor even fuzzer complains

jirka