linux-kernel - Re: [PATCH v3 6/7] perf config: Remove needless code about config set at cmd

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Message-ID: <20160530193500.GD2563@kernel.org>
Date:	Mon, 30 May 2016 16:35:00 -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>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH v3 6/7] perf config: Remove needless code about config
 set at cmd_config()

Em Tue, May 31, 2016 at 01:44:10AM +0900, Taeung Song escreveu:
> show_config() was reimplemented using perf_config()
> so it isn't needed to use perf_config_set__new() at cmd_config().
> And perf_config_set__delete() isn't needed at cmd_config() because of
> calling the function at run_builtin() when a sub-command finished.
> 
> And it isn't also needed to declare 'config_set' as extern variable
> because the variable is only handled at util/config.c from now on.

But the existing code looks more natural, i.e. before dealing with the
config_set, we try instantiating it, handling errors at constructor
calling time, etc.

Then, finally, calling the destructor when we don't need it anymore.
 
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
> ---
>  tools/perf/builtin-config.c | 8 --------
>  tools/perf/util/config.h    | 2 --
>  2 files changed, 10 deletions(-)
> 
> diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
> index cf6c396..412c725 100644
> --- a/tools/perf/builtin-config.c
> +++ b/tools/perf/builtin-config.c
> @@ -64,12 +64,6 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
>  	else if (use_user_config)
>  		config_exclusive_filename = user_config;
>  
> -	config_set = perf_config_set__new();
> -	if (!config_set) {
> -		ret = -1;
> -		goto out_err;
> -	}
> -
>  	switch (actions) {
>  	case ACTION_LIST:
>  		if (argc) {
> @@ -90,7 +84,5 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
>  		usage_with_options(config_usage, config_options);
>  	}
>  
> -	perf_config_set__delete();
> -out_err:
>  	return ret;
>  }
> diff --git a/tools/perf/util/config.h b/tools/perf/util/config.h
> index e9b47b3..be4e603 100644
> --- a/tools/perf/util/config.h
> +++ b/tools/perf/util/config.h
> @@ -20,8 +20,6 @@ struct perf_config_set {
>  	struct list_head sections;
>  };
>  
> -extern struct perf_config_set *config_set;
> -
>  struct perf_config_set *perf_config_set__new(void);
>  void perf_config_set__delete(void);
>  
> -- 
> 2.5.0