Re: [PATCH 9/9] perf/x86: Use update attribute groups for default attributes

[Jiri Olsa]

On Mon, May 13, 2019 at 11:35:45AM +0200, Peter Zijlstra wrote:
> On Sun, May 12, 2019 at 05:55:18PM +0200, Jiri Olsa wrote:
> > Using the new pmu::update_attrs attribute group for default
> > attributes - freeze_on_smi, allow_tsx_force_abort.
> > 
> > Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> 
> > diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
> > index 7db858c3bbec..e721be25abfb 100644
> > --- a/arch/x86/events/intel/core.c
> > +++ b/arch/x86/events/intel/core.c
> > @@ -3888,8 +3888,6 @@ static __initconst const struct x86_pmu core_pmu = {
> >  	.check_period		= intel_pmu_check_period,
> >  };
> >  
> > -static struct attribute *intel_pmu_attrs[];
> > -
> >  static __initconst const struct x86_pmu intel_pmu = {
> >  	.name			= "Intel",
> >  	.handle_irq		= intel_pmu_handle_irq,
> > @@ -3921,8 +3919,6 @@ static __initconst const struct x86_pmu intel_pmu = {
> >  	.format_attrs		= intel_arch3_formats_attr,
> >  	.events_sysfs_show	= intel_event_sysfs_show,
> >  
> > -	.attrs			= intel_pmu_attrs,
> > -
> >  	.cpu_prepare		= intel_pmu_cpu_prepare,
> >  	.cpu_starting		= intel_pmu_cpu_starting,
> >  	.cpu_dying		= intel_pmu_cpu_dying,
> > @@ -4449,6 +4445,10 @@ static struct attribute_group group_format_extra_skl = {
> >  	.is_visible = exra_is_visible,
> >  };
> >  
> > +static struct attribute_group group_default = {
> > +	.attrs = intel_pmu_attrs,
> > +};
> > +
> >  static const struct attribute_group *attr_update[] = {
> >  	&group_events_td,
> >  	&group_events_mem,
> > @@ -4457,6 +4457,7 @@ static const struct attribute_group *attr_update[] = {
> >  	&group_caps_lbr,
> >  	&group_format_extra,
> >  	&group_format_extra_skl,
> > +	&group_default,
> >  	NULL,
> >  };
> 
> 
> Ah, I would have expected to see this somewhat dodgy hack go away too:
> 
> 	static struct attribute *intel_pmu_attrs[] = {
> 		&dev_attr_freeze_on_smi.attr,
> 		NULL, /* &dev_attr_allow_tsx_force_abort.attr.attr */
> 		NULL,
> 	};
> 
> 	intel_pmu_attrs[1] = &dev_attr_allow_tsx_force_abort.attr;
> 
> 
> That just begs for a .visislbe too, right?

right, we could do that.. I'll check on it and send separate patch

thanks,
jirka