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

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Date:   Tue, 2 May 2017 12:12:00 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Taeung Song <treeze.taeung@...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

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
>  
>  	perf_config_items__for_each_entry(&set->sections, section) {
> @@ -105,7 +105,7 @@ static int show_config(struct perf_config_set *set)
>  	struct perf_config_section *section;
>  	struct perf_config_item *item;
>  
> -	if (set == NULL)
> +	if (set == NULL || list_empty(&set->sections))
>  		return -1;
>  
>  	perf_config_set__for_each_entry(set, section, item) {
> diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
> index 8d724f0..492c862 100644
> --- a/tools/perf/util/config.c
> +++ b/tools/perf/util/config.c
> @@ -707,7 +707,7 @@ int perf_config(config_fn_t fn, void *data)
>  	struct perf_config_section *section;
>  	struct perf_config_item *item;
>  
> -	if (config_set == NULL)
> +	if (config_set == NULL || list_empty(&config_set->sections))
>  		return -1;
>  
>  	perf_config_set__for_each_entry(config_set, section, item) {
> -- 
> 2.7.4