linux-kernel - Re: [PATCH 1/2] perf diff: Fix segfault on perf diff -o N option

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Date:   Thu, 2 Feb 2017 11:34:16 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] perf diff: Fix segfault on perf diff -o N option

Em Thu, Feb 02, 2017 at 11:43:03AM +0900, Namhyung Kim escreveu:
> Hi Arnaldo,
> 
> Could you please consider merging it to the perf/urgent?

Fell thru the cracks, applied to perf/urgent, thanks for the reminder!

- Arnaldo
 
> Thanks,
> Namhyung
> 
> 
> On Wed, Jan 18, 2017 at 02:14:56PM +0900, Namhyung Kim wrote:
> > The -o/--order option is to select column number to sort a diff result.
> > It does the job by adding a hpp field at the beginning of the sort list.
> > But it should not be added to the output field list as it has no
> > callbacks required by a output field.
> > 
> > During the setup_sorting(), the perf_hpp__setup_output_field() appends
> > given sort keys to the output field if it's not there already.
> > 
> > Originally it was checked by the fmt->list being non-empty.  But commit
> > 3f931f2c4274 changed it to check the ->equal callback.  Anyway we don't
> > need to add the pseudo hpp field to the output field list since it won't
> > be used for output.  So just skip fields if they have no ->color or
> >  ->entry callbacks.
> > 
> > Fixes: 3f931f2c4274 ("perf hists: Make hpp setup function generic")
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >  tools/perf/ui/hist.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
> > index 37388397b5bc..4ec79b2f9416 100644
> > --- a/tools/perf/ui/hist.c
> > +++ b/tools/perf/ui/hist.c
> > @@ -560,6 +560,10 @@ void perf_hpp__setup_output_field(struct perf_hpp_list *list)
> >  	perf_hpp_list__for_each_sort_list(list, fmt) {
> >  		struct perf_hpp_fmt *pos;
> >  
> > +		/* skip sort-only fields ("sort_compute" in perf diff) */
> > +		if (!fmt->entry && !fmt->color)
> > +			continue;
> > +
> >  		perf_hpp_list__for_each_format(list, pos) {
> >  			if (fmt_equal(fmt, pos))
> >  				goto next;
> > -- 
> > 2.11.0
> >