linux-kernel - Re: [PATCH 2/7] perf config: Check list empty before showing configs

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Message-ID: <b8e4a1c2-2a77-b058-197d-6362dbf43605@gmail.com>
Date:   Wed, 3 May 2017 13:05:35 +0900
From:   Taeung Song <treeze.taeung@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 2/7] perf config: Check list empty before showing configs

Hi Arnaldo,

On 05/03/2017 12:12 AM, Arnaldo Carvalho de Melo wrote:
> Em Wed, Apr 26, 2017 at 09:21:03PM +0900, Taeung Song escreveu:
>> If existent config files contains nothing,
>> the sections list in config_set can be empty.
>>
>> So check not only NULL pointer of config_set but
>> also the list in config_set.
> <SNIP>
>> +++ b/tools/perf/builtin-config.c
>> @@ -75,7 +75,7 @@ static int show_spec_config(struct perf_config_set *set, const char *var)
>>  	struct perf_config_section *section;
>>  	struct perf_config_item *item;
>>
>> -	if (set == NULL)
>> +	if (set == NULL || list_empty(&set->sections))
>>  		return -1;
>
> But should we consider an error to have an empty config file? I don't
> think so :-\
>
> - Arnaldo

I think if we do, when a config file is not only not exist but also empty,
user can see the error message
(e.g. "Nothing configured, please check your ~/.perfconfig").
And IMHO, it seems better.

But if you don't think so, I got it.

Thanks,
Taeung