linux-kernel - Re: [PATCH 1/4] tracing: add DEFINE_TRACE

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Date:	Wed, 25 Feb 2009 17:33:09 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>,
	Pekka Paalanen <pq@....fi>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	Martin Bligh <mbligh@...gle.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 1/4] tracing: add DEFINE_TRACE_FMT to tracepoint.h


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Wed, 25 Feb 2009, Mathieu Desnoyers wrote:
> 
> > * Steven Rostedt (rostedt@...dmis.org) wrote:
> > > From: Steven Rostedt <srostedt@...hat.com>
> > > 
> > > This patch creates a DEFINE_TRACE_FMT to map to DECLARE_TRACE.
> > > This allows for the developers to place format strings and
> > > args in with their tracepoint declaration. A tracer may now
> > > override the DEFINE_TRACE_FMT macro and use it to record
> > > a default format.
> > > 
> > 
> > Hi Steven,
> > 
> > How comes does a DEFINE_* maps to a DECLARE_* ?
> > 
> > Usually, DEFINE_* are meant to be put in .c files. DECLARE_* are in
> > headers. I don't see how the mapping you propose here can be
> > semantically correct ?
> 
> Because it can be either a define or a declare ;-)
> 
> Gag, I can't win! First Andrew points out that I use 
> DECLARE_TRACE_FMT when it should be a DEFINE. Now I go change 
> it and you state that it should be a DECLARE not a DEFINE!
> 
> Well, any tracer that remaps it, it should be a DEFINE. Just 
> in the "default" case of trace points, is it used as a 
> DECLARE. Because, it ignores the fmt parameter that would be 
> used in the define.

Add either both or none of them. I'd suggest the latter ;-)

TRACE_FORMAT() would be perfect.

	Ingo
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