linux-kernel - Re: [PATCH 04/13] perf tests: Add another metric parsing test

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Date:   Tue, 2 Jun 2020 13:30:46 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 04/13] perf tests: Add another metric parsing test

On Tue, Jun 2, 2020 at 12:08 PM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Tue, Jun 02, 2020 at 10:58:32AM -0700, Ian Rogers wrote:
>
> SNIP
>
> > > +static int check_parse_fake(const char *id)
> > > +{
> > > +       struct parse_events_error error;
> >
> > nit: this reads funny as it isn't clear, without looking at
> > check_parse_id, that error is zero initialized.
>
> right, how about something like below?

Thanks, looks good!
Ian

> thanks,
> jirka
>
>
> ---
> diff --git a/tools/perf/tests/pmu-events.c b/tools/perf/tests/pmu-events.c
> index d3343827eb4d..c745b6e13cbe 100644
> --- a/tools/perf/tests/pmu-events.c
> +++ b/tools/perf/tests/pmu-events.c
> @@ -403,7 +403,6 @@ static int check_parse_id(const char *id, struct parse_events_error *error,
>         evlist = evlist__new();
>         if (!evlist)
>                 return -ENOMEM;
> -       memset(error, 0, sizeof(*error));
>         ret = parse_events(evlist, id, error, fake_pmu);
>         evlist__delete(evlist);
>         return ret;
> @@ -411,7 +410,7 @@ static int check_parse_id(const char *id, struct parse_events_error *error,
>
>  static int check_parse_cpu(const char *id, bool same_cpu, struct pmu_event *pe)
>  {
> -       struct parse_events_error error;
> +       struct parse_events_error error = { 0 };
>
>         int ret = check_parse_id(id, &error, false);
>         if (ret && same_cpu) {
> @@ -433,7 +432,7 @@ static int check_parse_cpu(const char *id, bool same_cpu, struct pmu_event *pe)
>
>  static int check_parse_fake(const char *id)
>  {
> -       struct parse_events_error error;
> +       struct parse_events_error error = { 0 };
>         int ret = check_parse_id(id, &error, true);
>
>         free(error.str);
>