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

[Peter Zijlstra <peterz@infradead.org>]

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?