linux-kernel - Re: [PATCH v2 4/4] perf tools: Increase index if perf_evsel__new

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Message-ID: <20170131132541.GF4491@kernel.org>
Date:   Tue, 31 Jan 2017 10:25:41 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Taeung Song <treeze.taeung@...il.com>
Cc:     linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH v2 4/4] perf tools: Increase index if
 perf_evsel__new_idx() succeeded

Em Tue, Jan 31, 2017 at 08:38:31PM +0900, Taeung Song escreveu:
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Signed-off-by: Taeung Song <treeze.taeung@...il.com>

The title of this patch is misleading, ambiguous. It leads one to have
doubt if we were not incrementing that index before and now we are,
after successfully calling perf_evsel__new_idx().

It should have been:

  "perf tools: Only increase index if perf_evsel__new_idx() succeeds"

- Arnaldo

> ---
>  tools/perf/util/parse-events.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 87a3e5a..ac47c12 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -311,10 +311,11 @@ __add_event(struct list_head *list, int *idx,
>  
>  	event_attr_init(attr);
>  
> -	evsel = perf_evsel__new_idx(attr, (*idx)++);
> +	evsel = perf_evsel__new_idx(attr, *idx);
>  	if (!evsel)
>  		return NULL;
>  
> +	(*idx)++;
>  	evsel->cpus     = cpu_map__get(cpus);
>  	evsel->own_cpus = cpu_map__get(cpus);
>  
> -- 
> 2.7.4