linux-kernel - Re: [RFC PATCH 24/25] perf stat: Add check to ensure correctness in platform that does not support hardware-grouping

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Date:   Tue, 26 Sep 2023 12:38:57 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     weilin.wang@...el.com, Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Perry Taylor <perry.taylor@...el.com>,
        Samantha Alt <samantha.alt@...el.com>,
        Caleb Biggers <caleb.biggers@...el.com>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [RFC PATCH 24/25] perf stat: Add check to ensure correctness in
 platform that does not support hardware-grouping



On 2023-09-25 2:18 a.m., weilin.wang@...el.com wrote:
> From: Weilin Wang <weilin.wang@...el.com>
> 
> Add check and return with -EINVAL when event json files do not support
> hardware aware grouping so that the program could successfully fall back to
> normal grouping without segfault.

Seems another bug fix. Please merge it with the patch which introduce
the feature/bug.

Thanks,
Kan
> 
> Signed-off-by: Weilin Wang <weilin.wang@...el.com>
> ---
>  tools/perf/util/metricgroup.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 6a4404226..1c89c9371 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -1684,6 +1684,8 @@ static int metricgroup__add_metric_event_callback(const struct pmu_event *pe,
>  	struct metricgroup__add_metric_event_data *d = data;
>  
>  	if (!strcasecmp(pe->name, d->event_name)) {
> +		if (!pe->counter)
> +			return -EINVAL;
>  		event = event_info__new(d->event_id, pe->pmu, pe->counter,
>  					pe->taken_alone, /*free_counter=*/false);
>  		if (!event)