linux-kernel - Re: [PATCH 3/4] Add the fp_selection_helper function to set the file pointer for the related functions

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Date:   Fri, 22 Sep 2017 11:18:40 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     yuzhoujian <ufo19890607@...il.com>, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, dsahern@...il.com, namhyung@...nel.org,
        milian.wolff@...b.com, arnaldo.melo@...il.com,
        yuzhoujian@...ichuxing.com, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] Add the fp_selection_helper function to set the file
 pointer for the related functions

Em Fri, Sep 22, 2017 at 11:03:27AM +0200, Jiri Olsa escreveu:
> On Mon, Sep 18, 2017 at 01:55:21PM +0800, yuzhoujian wrote:
> > Signed-off-by: yuzhoujian <yuzhoujian@...ichuxing.com>
> > ---
> >  tools/perf/builtin-script.c | 24 ++++++++++++++++--------
> >  1 file changed, 16 insertions(+), 8 deletions(-)
> > 
> > diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> > index f709f6f..89bab68 100644
> > --- a/tools/perf/builtin-script.c
> > +++ b/tools/perf/builtin-script.c
> > @@ -1527,6 +1527,13 @@ static int cleanup_scripting(void)
> >  	return scripting_ops ? scripting_ops->stop_script() : 0;
> >  }
> >  
> > +static FILE *fp_selection_helper(bool per_event_dump)
> > +{
> > +	if (per_event_dump == false)
> > +		return stdout;
> > +	else
> > +		return per_event_dump_file;
> 
> when's the per_event_dump_file ever set? 

And my first reaction with this "helper" was: what is this needed for?!?
Why not have a local variable in the function where the whole chain is
called from and there set the output doing this 'perf_event_dump' test
_just once_.

Also, using 'per_event_dump == false' for a boolean variable is valid,
but utterly uncommon and unnecessary, why not:

	FILE *fp = per_event_dump ? per_event_dump_file : stdout;

then use fp to pass to the initial function, etc?

- Arnaldo