linux-kernel - Re: [PATCH 4/5] perf tools: Propagate error info from tp

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Date:	Mon, 14 Sep 2015 18:05:38 -0400
From:	Raphaël Beamonte <raphael.beamonte@...il.com>
To:	Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, Jiri Olsa <jolsa@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Matt Fleming <matt@...eblueprint.co.uk>
Subject: Re: [PATCH 4/5] perf tools: Propagate error info from tp_format

2015-09-14 17:36 GMT-04:00 Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>:
> Em Mon, Sep 14, 2015 at 04:59:41PM -0400, Raphaël Beamonte escreveu:
>> 2015-09-14 16:53 GMT-04:00 Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>:
>> > +++ b/tools/perf/util/evsel.c
>> > @@ -234,7 +234,9 @@ struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int
>> >         struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
>> >         int err = -ENOMEM;
>> >
>> > -       if (evsel != NULL) {
>> > +       if (evsel == NULL) {
>> > +               goto out_err;
>> > +       } else {
>>
>> Is the else really necessary after a goto?
>
> Not really, we can remove it and all would be equivalent (the code
> with/without should be the same), its just that I wanted to avoid
> touching the identation to reduce patch size and since we need o open a
> brace to declare that attr variable...
>
> - Arnaldo

Ok. Though, given the content of that function, we could probably
declare attr in the first lines of the function and assign it its
value after the if. But I understand the patch size argument! :o)
On another subject, but on the same lines, shouldn't we use if
(!evsel) instead of if (evsel == NULL)? (kernel code style if I'm not
mistaken) Or is there something that prevents from using it here?

>> >                 struct perf_event_attr attr = {
>> >                         .type          = PERF_TYPE_TRACEPOINT,
>> >                         .sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
>> > @@ -261,6 +263,7 @@ struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int
>> >  out_free:
>> >         zfree(&evsel->name);
>> >         free(evsel);
>> > +out_err:
>> >         return ERR_PTR(err);
>> >  }
>> >
>> > diff --git a/tools/perf/util/trace-event.c b/tools/perf/util/trace-event.c
>> > index 8e3a60e3e15f..802bb868d446 100644
>> > --- a/tools/perf/util/trace-event.c
>> > +++ b/tools/perf/util/trace-event.c
>> > @@ -100,7 +100,7 @@ struct event_format*
>> >  trace_event__tp_format(const char *sys, const char *name)
>> >  {
>> >         if (!tevent_initialized && trace_event__init2())
>> > -               return NULL;
>> > +               return ERR_PTR(-ENOMEM);
>> >
>> >         return tp_format(sys, name);
>> >  }
--
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