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

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Date:	Tue, 22 Dec 2009 09:27:12 +0800
From:	Wenji Huang <wenji.huang@...cle.com>
To:	John Kacur <jkacur@...hat.com>
CC:	linux-kernel@...r.kernel.org, acme@...hat.com, mingo@...e.hu,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] perf: fix incorrect return value for else case

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)
> 
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);
  }
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