linux-kernel - Re: [PATCH -tip v14 07/12] tracing: Introduce TRACE_FIELD

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Message-ID: <20090819010903.GI5231@nowhere>
Date:	Wed, 19 Aug 2009 03:09:05 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	kvm <kvm@...r.kernel.org>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Avi Kivity <avi@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jason Baron <jbaron@...hat.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>,
	PrzemysławPawełczyk <przemyslaw@...elczyk.it>,
	Roland McGrath <roland@...hat.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Vegard Nossum <vegard.nossum@...il.com>
Subject: Re: [PATCH -tip v14 07/12] tracing: Introduce TRACE_FIELD_ZERO()
	macro

On Thu, Aug 13, 2009 at 04:35:01PM -0400, Masami Hiramatsu wrote:
> Use TRACE_FIELD_ZERO(type, item) instead of TRACE_FIELD_ZERO_CHAR(item).
> This also includes a fix of TRACE_ZERO_CHAR() macro.


I can't find what the fix is about (see below)



> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
> Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
> Cc: Avi Kivity <avi@...hat.com>
> Cc: Andi Kleen <ak@...ux.intel.com>
> Cc: Christoph Hellwig <hch@...radead.org>
> Cc: Frank Ch. Eigler <fche@...hat.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Jason Baron <jbaron@...hat.com>
> Cc: Jim Keniston <jkenisto@...ibm.com>
> Cc: K.Prasad <prasad@...ux.vnet.ibm.com>
> Cc: Lai Jiangshan <laijs@...fujitsu.com>
> Cc: Li Zefan <lizf@...fujitsu.com>
> Cc: Przemysław Pawełczyk <przemyslaw@...elczyk.it>
> Cc: Roland McGrath <roland@...hat.com>
> Cc: Sam Ravnborg <sam@...nborg.org>
> Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Tom Zanussi <tzanussi@...il.com>
> Cc: Vegard Nossum <vegard.nossum@...il.com>
> ---
> 
>  kernel/trace/trace_event_types.h |    4 ++--
>  kernel/trace/trace_export.c      |   16 ++++++++--------
>  2 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/kernel/trace/trace_event_types.h b/kernel/trace/trace_event_types.h
> index 6db005e..e74f090 100644
> --- a/kernel/trace/trace_event_types.h
> +++ b/kernel/trace/trace_event_types.h
> @@ -109,7 +109,7 @@ TRACE_EVENT_FORMAT(bprint, TRACE_BPRINT, bprint_entry, ignore,
>  	TRACE_STRUCT(
>  		TRACE_FIELD(unsigned long, ip, ip)
>  		TRACE_FIELD(char *, fmt, fmt)
> -		TRACE_FIELD_ZERO_CHAR(buf)
> +		TRACE_FIELD_ZERO(char, buf)
>  	),
>  	TP_RAW_FMT("%08lx (%d) fmt:%p %s")
>  );
> @@ -117,7 +117,7 @@ TRACE_EVENT_FORMAT(bprint, TRACE_BPRINT, bprint_entry, ignore,
>  TRACE_EVENT_FORMAT(print, TRACE_PRINT, print_entry, ignore,
>  	TRACE_STRUCT(
>  		TRACE_FIELD(unsigned long, ip, ip)
> -		TRACE_FIELD_ZERO_CHAR(buf)
> +		TRACE_FIELD_ZERO(char, buf)
>  	),
>  	TP_RAW_FMT("%08lx (%d) fmt:%p %s")
>  );
> diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
> index 71c8d7f..b0ac92c 100644
> --- a/kernel/trace/trace_export.c
> +++ b/kernel/trace/trace_export.c
> @@ -42,9 +42,9 @@ extern void __bad_type_size(void);
>  	if (!ret)							\
>  		return 0;
>  
> -#undef TRACE_FIELD_ZERO_CHAR
> -#define TRACE_FIELD_ZERO_CHAR(item)					\
> -	ret = trace_seq_printf(s, "\tfield:char " #item ";\t"		\
> +#undef TRACE_FIELD_ZERO
> +#define TRACE_FIELD_ZERO(type, item)					\
> +	ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"	\
>  			       "offset:%u;\tsize:0;\n",			\
>  			       (unsigned int)offsetof(typeof(field), item)); \
>  	if (!ret)							\
> @@ -92,9 +92,6 @@ ftrace_format_##call(struct ftrace_event_call *unused,			\
>  
>  #include "trace_event_types.h"
>  
> -#undef TRACE_ZERO_CHAR
> -#define TRACE_ZERO_CHAR(arg)
> -
>  #undef TRACE_FIELD
>  #define TRACE_FIELD(type, item, assign)\
>  	entry->item = assign;
> @@ -107,6 +104,9 @@ ftrace_format_##call(struct ftrace_event_call *unused,			\
>  #define TRACE_FIELD_SIGN(type, item, assign, is_signed)	\
>  	TRACE_FIELD(type, item, assign)
>  
> +#undef TRACE_FIELD_ZERO
> +#define TRACE_FIELD_ZERO(type, item)
> +



Is it about the above moving?
If so, could you just tell so that I can add something about
it in the changelog.

Thanks.
Frederic.




>  #undef TP_CMD
>  #define TP_CMD(cmd...)	cmd
>  
> @@ -178,8 +178,8 @@ __attribute__((section("_ftrace_events"))) event_##call = {		\
>  	if (ret)							\
>  		return ret;
>  
> -#undef TRACE_FIELD_ZERO_CHAR
> -#define TRACE_FIELD_ZERO_CHAR(item)
> +#undef TRACE_FIELD_ZERO
> +#define TRACE_FIELD_ZERO(type, item)
>  
>  #undef TRACE_EVENT_FORMAT
>  #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt)	\
> 
> 
> -- 
> Masami Hiramatsu
> 
> Software Engineer
> Hitachi Computer Products (America), Inc.
> Software Solutions Division
> 
> e-mail: mhiramat@...hat.com

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