linux-kernel - Re: [PATCH] perf tools: report initial event parsing error

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Date:   Fri, 15 Nov 2019 23:49:10 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Allison Randal <allison@...utok.net>,
        Davidlohr Bueso <dave@...olabs.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Adrian Hunter <adrian.hunter@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf tools: report initial event parsing error

On Mon, Nov 11, 2019 at 4:02 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Fri, Nov 08, 2019 at 10:15:33AM -0800, Ian Rogers wrote:
>
> SNIP
>
> > diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> > index 43c05eae1768..46a72ecac427 100644
> > --- a/tools/perf/builtin-trace.c
> > +++ b/tools/perf/builtin-trace.c
> > @@ -3016,11 +3016,18 @@ static bool evlist__add_vfs_getname(struct evlist *evlist)
> >  {
> >       bool found = false;
> >       struct evsel *evsel, *tmp;
> > -     struct parse_events_error err = { .idx = 0, };
> > -     int ret = parse_events(evlist, "probe:vfs_getname*", &err);
> > +     struct parse_events_error err;
> > +     int ret;
> >
> > -     if (ret)
> > +     bzero(&err, sizeof(err));
>
> hum, what's the problem with the zero init above?

There are 3 patterns for initializing parse_events_error in the code,
bzero, memset and {.idx =0,}. I made all instances use bzero for
consistency.

Thanks,
Ian

> jirka
>