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

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Date:   Thu, 19 Oct 2017 12:22:07 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Shaokun Zhang <zhangshaokun@...ilicon.com>
Cc:     will.deacon@....com, jonathan.cameron@...wei.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linuxarm@...wei.com,
        Anurup M <anurup.m@...wei.com>
Subject: Re: [PATCH v6 2/6] perf: hisi: Add support for HiSilicon SoC uncore
 PMU driver

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.