linux-kernel - Re: [PATCH 1/3] perf ftrace: Remove needless code setting default tracer

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Message-ID: <20170126185458.GT10340@kernel.org>
Date:   Thu, 26 Jan 2017 15:54:58 -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>,
        Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 1/3] perf ftrace: Remove needless code setting default
 tracer

Em Thu, Jan 26, 2017 at 06:35:37PM +0900, Taeung Song escreveu:
> Lately commit a349764 made 'function_graph' be the default tracer.
> So ftrace.tracer variable can't be NULL but the other code setting default
> tracer remained. For this reason, remove it as below.
> And use existing DEFAULT_TRACER instead of "function_graph".

Rewrote a bit the commit log, applied,

- Arnaldo
 
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
> ---
>  tools/perf/builtin-ftrace.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
> index d05658d..414444d 100644
> --- a/tools/perf/builtin-ftrace.c
> +++ b/tools/perf/builtin-ftrace.c
> @@ -202,7 +202,7 @@ int cmd_ftrace(int argc, const char **argv, const char *prefix __maybe_unused)
>  {
>  	int ret;
>  	struct perf_ftrace ftrace = {
> -		.tracer = "function_graph",
> +		.tracer = DEFAULT_TRACER,
>  		.target = { .uid = UINT_MAX, },
>  	};
>  	const char * const ftrace_usage[] = {
> @@ -231,9 +231,6 @@ int cmd_ftrace(int argc, const char **argv, const char *prefix __maybe_unused)
>  	if (ret < 0)
>  		goto out_delete_evlist;
>  
> -	if (ftrace.tracer == NULL)
> -		ftrace.tracer = DEFAULT_TRACER;
> -
>  	ret = __cmd_ftrace(&ftrace, argc, argv);
>  
>  out_delete_evlist:
> -- 
> 2.7.4