Re: [PATCH v6 2/6] perf: hisi: Add support for HiSilicon SoC uncore PMU driver

[Mark Rutland]

On Thu, Oct 19, 2017 at 07:05:17PM +0800, Shaokun Zhang wrote:
> This patch adds support HiSilicon SoC uncore PMU driver framework and
> interfaces.

> +static bool hisi_validate_event_group(struct perf_event *event)
> +{
> +     struct perf_event *sibling, *leader = event->group_leader;
> +     struct hisi_pmu *hisi_pmu = to_hisi_pmu(event->pmu);
> +     /* Include count for the event */
> +     int counters = 1;
> +
> +     /*
> +      * We must NOT create groups containing mixed PMUs, although
> +      * software events are acceptable
> +      */
> +     if (leader->pmu != event->pmu && !is_software_event(leader))
> +             return false;
> +
> +     /* Increment counter for the leader */
> +     counters++;

Sorry I didn't spot this before, but I believe this should be:

        if (event != leader && !is_software_event(leader))
                counters++;

Since the leader can be a SW event, and for the group leader itself,
event == leader.

Assuming there aren't any major issues elsewhere, I can fix this up when
applying the series.

Thanks,
Mark.