linux-kernel - Re: [PATCH 3/7] tracing: use generic _

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Date:	Tue, 10 Mar 2009 11:56:25 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Theodore Tso <tytso@....edu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 3/7] tracing: use generic __stringify

On Tue, Mar 10, 2009 at 12:57:13AM -0400, Steven Rostedt wrote:
> From: Steven Rostedt <srostedt@...hat.com>
> 
> Impact: clean up
> 
> This removes the custom made STR(x) macros in the tracer and uses
> the generic __stringify macro instead.
> 
> Signed-off-by: Steven Rostedt <srostedt@...hat.com>
> ---


Hi,

Why not simply use the # ?

Frederic.


>  kernel/trace/events.c               |    4 +---
>  kernel/trace/trace_events_stage_3.h |    4 ++--
>  kernel/trace/trace_selftest.c       |    6 ++----
>  3 files changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/kernel/trace/events.c b/kernel/trace/events.c
> index f2509cb..9fc918d 100644
> --- a/kernel/trace/events.c
> +++ b/kernel/trace/events.c
> @@ -2,9 +2,7 @@
>   * This is the place to register all trace points as events.
>   */
>  
> -/* someday this needs to go in a generic header */
> -#define __STR(x) #x
> -#define STR(x) __STR(x)
> +#include <linux/stringify.h>
>  
>  #include <trace/trace_events.h>
>  
> diff --git a/kernel/trace/trace_events_stage_3.h b/kernel/trace/trace_events_stage_3.h
> index 557ca52..41b82b9 100644
> --- a/kernel/trace/trace_events_stage_3.h
> +++ b/kernel/trace/trace_events_stage_3.h
> @@ -139,7 +139,7 @@ static struct ftrace_event_call __used					\
>  __attribute__((__aligned__(4)))						\
>  __attribute__((section("_ftrace_events"))) event_##call = {		\
>  	.name 			= #call,				\
> -	.system			= STR(TRACE_SYSTEM),			\
> +	.system			= __stringify(TRACE_SYSTEM),		\
>  	.regfunc		= ftrace_reg_event_##call,		\
>  	.unregfunc		= ftrace_unreg_event_##call,		\
>  }
> @@ -225,7 +225,7 @@ static struct ftrace_event_call __used					\
>  __attribute__((__aligned__(4)))						\
>  __attribute__((section("_ftrace_events"))) event_##call = {		\
>  	.name 			= #call,				\
> -	.system			= STR(TRACE_SYSTEM),			\
> +	.system			= __stringify(TRACE_SYSTEM),		\
>  	.regfunc		= ftrace_reg_event_##call,		\
>  	.unregfunc		= ftrace_unreg_event_##call,		\
>  	.raw_init		= ftrace_raw_init_event_##call,		\
> diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
> index 7238646..f907a2b 100644
> --- a/kernel/trace/trace_selftest.c
> +++ b/kernel/trace/trace_selftest.c
> @@ -1,5 +1,6 @@
>  /* Include in trace.c */
>  
> +#include <linux/stringify.h>
>  #include <linux/kthread.h>
>  #include <linux/delay.h>
>  
> @@ -100,9 +101,6 @@ static inline void warn_failed_init_tracer(struct tracer *trace, int init_ret)
>  
>  #ifdef CONFIG_DYNAMIC_FTRACE
>  
> -#define __STR(x) #x
> -#define STR(x) __STR(x)
> -
>  /* Test dynamic code modification and ftrace filters */
>  int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
>  					   struct trace_array *tr,
> @@ -130,7 +128,7 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
>  	 * start of the function names. We simply put a '*' to
>  	 * accommodate them.
>  	 */
> -	func_name = "*" STR(DYN_FTRACE_TEST_NAME);
> +	func_name = "*" __stringify(DYN_FTRACE_TEST_NAME);
>  
>  	/* filter only on our function */
>  	ftrace_set_filter(func_name, strlen(func_name), 1);
> -- 
> 1.6.1.3
> 
> -- 

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