linux-kernel - Re: [PATCH] perf: fix incorrect return value for else case

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Date:	Wed, 13 Jan 2010 09:45:40 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Wenji Huang <wenji.huang@...cle.com>,
	John Kacur <jkacur@...hat.com>, linux-kernel@...r.kernel.org,
	acme@...hat.com
Subject: Re: [PATCH] perf: fix incorrect return value for else case


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> On Tue, Dec 22, 2009 at 09:27:12AM +0800, Wenji Huang wrote:
> > John Kacur wrote:
> >> On Mon, Dec 21, 2009 at 10:22 AM, Wenji Huang <wenji.huang@...cle.com> wrote:
> >>> Return original cmd instead of adding prefix.
> >>>
> >>> Signed-off-by: Wenji Huang <wenji.huang@...cle.com>
> >>> ---
> >>>  tools/perf/builtin-help.c |    2 +-
> >>>  1 files changed, 1 insertions(+), 1 deletions(-)
> >>>
> >>> diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c
> >>> index 9f810b1..ca77df5 100644
> >>> --- a/tools/perf/builtin-help.c
> >>> +++ b/tools/perf/builtin-help.c
> >>> @@ -317,7 +317,7 @@ static const char *cmd_to_page(const char *perf_cmd)
> >>>        else if (is_perf_command(perf_cmd))
> >>>                return prepend("perf-", perf_cmd);
> >>>        else
> >>> -               return prepend("perf-", perf_cmd);
> >>> +               return perf_cmd;
> >>>  }
> >>>
> >>>  static void setup_man_path(void)
> >>> --
> >>> 1.5.6
> >>
> >> Sorry - I believe we should NAK this patch.
> >> It would turn the following
> >>
> >> ./perf nonsuchcmd --help
> >> No manual entry for perf-nonsuchcmd
> >>
> >> into
> >>
> >> ./perf nonsuchcmd --help
> >> No manual entry for nonsuchcmd
> >>
> >> The former is correct, the name of the man page includes the prefix "perf-"
> >>
> >> NAK
> >>
> >> (cc-ing Frederic in case he sees it differently)
> 
> 
> I personally don't mind.
> Having either
> 
> 	./perf nonsuchcmd --help
> 	No manual entry for perf-nonsuchcmd
> or
> 
> 	./perf nonsuchcmd --help
> 	No manual entry for nonsuchcmd
> 
> both make sense for the user.
> 
> 
> >>
> > Thanks. Since we think the former is better, why not make
> > the code compact? Like,
> >
> > diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c
> > index 9f810b1..65e2691 100644
> > --- a/tools/perf/builtin-help.c
> > +++ b/tools/perf/builtin-help.c
> > @@ -314,8 +314,6 @@ static const char *cmd_to_page(const char *perf_cmd)
> >                 return "perf";
> >         else if (!prefixcmp(perf_cmd, "perf"))
> >                 return perf_cmd;
> > -       else if (is_perf_command(perf_cmd))
> > -               return prepend("perf-", perf_cmd);
> >         else
> >                 return prepend("perf-", perf_cmd);
> >  }
> 
> 
> Agreed!
> Thanks.

if this looks good to everyone please re-send the patch with a changelog and 
with acks added.

Thanks,

	Ingo
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