linux-kernel - Re: trace/events: DECLARE vs DEFINE semantic

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Date:	Wed, 02 Dec 2009 17:46:45 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	randy.dunlap@...cle.com, wcohen@...hat.com, fweisbec@...il.com,
	tglx@...utronix.de, jbaron@...hat.com,
	linux-tip-commits@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: trace/events: DECLARE vs DEFINE semantic

On Wed, 2009-12-02 at 17:36 -0500, Masami Hiramatsu wrote:

> > Or do you (or anyone else) have a better name?
> 
> How about renaming DEFINE_EVENT to TRACE_EVENT_CLASS?
> 
> DECLARE_EVENT_CLASS(y, ...)	declare an event-class y
> TRACE_EVENT_CLASS(x, y, ...)	define/declare a trace event x from event-class y
> TRACE_EVENT(x, ...)		define/declare a trace event x
> 
> Thus TRACE_EVENT_* implies that this macro will be expanded
> to both of definition and declaration.
> I don't think separating it is good idea from the viewpoint
> of maintaining code.

Hmm, what about just:

TRACE_CLASS - Declares a class
TRACE_CLASS_EVENT - defines an event for said class
TRACE_EVENT - Declares a class and defines an event (as is today)

-- Steve


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