linux-kernel - Re: [PATCH 2/2] ftrace: Output REC->var instead of _

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Message-ID: <20090408112906.GB6005@nowhere>
Date:	Wed, 8 Apr 2009 13:29:07 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Zhaolei <zhaolei@...fujitsu.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ftrace: Output REC->var instead of __entry->var
	for trace format

On Wed, Apr 08, 2009 at 05:00:13PM +0800, Zhaolei wrote:
> print fmt: "irq=%d return=%s", __entry->irq, __entry->ret ? \"handled\" : \"unhandled\"
> 
> "__entry" should be convert to "REC" by __stringify() macro.
> 
> Signed-off-by: Zhao Lei <zhaolei@...fujitsu.com>
> ---
>  kernel/trace/trace_events_stage_2.h |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/trace/trace_events_stage_2.h b/kernel/trace/trace_events_stage_2.h
> index 9e47c39..d694a8a 100644
> --- a/kernel/trace/trace_events_stage_2.h
> +++ b/kernel/trace/trace_events_stage_2.h
> @@ -108,10 +108,10 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags)	\
>  		return 0;
>  
>  #undef __entry
> -#define __entry "REC"
> +#define __entry REC
>  
>  #undef TP_printk
> -#define TP_printk(fmt, args...) "%s, %s\n", #fmt, #args
> +#define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
>  
>  #undef TRACE_EVENT
>  #define TRACE_EVENT(call, proto, args, tstruct, assign, print)		\
> -- 
> 1.5.5.3
> 
> 


Ah indeed nice catch.
The patch that expands stringify to multiple args looks good too.

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