linux-kernel - Re: TRACE_EVENT

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Message-ID: <20090921200042.29f0cf49@infradead.org>
Date:	Mon, 21 Sep 2009 20:00:42 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>, mingo@...e.hu
Subject: Re: TRACE_EVENT_ABI ?

On Mon, 21 Sep 2009 12:46:07 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Mon, 2009-09-21 at 15:28 +0200, Arjan van de Ven wrote:
> > On Mon, 21 Sep 2009 09:26:41 -0400 (EDT)
> > Steven Rostedt <rostedt@...dmis.org> wrote:
> > 
> > > 
> > > [ Resending due to wrong SMTP server ]
> > > 
> > > 
> > > On Mon, 21 Sep 2009, Arjan van de Ven wrote:
> > > 
> > > > Hi,
> > > > 
> > > > Ingo suggested to make a TRACE_EVENT_ABI, which is equivalent in
> > > > implementation to TRACE_EVENT, except that it signals a stable
> > > > interface.
> > > > 
> > > > In trying to implement this I'm running into a wall where
> > > > TRACE_EVENT keeps being defined in many different ways all over
> > > > the place, making this a really nasty hack to make it just an
> > > > alias.
> > > > 
> > > > Do you have any clever ideas on how to make this an alias
> > > > without fouling up the whole tracing system?
> > > > 
> > > 
> > > I don't know what you've done so far, but can't you simply in
> > > tracepoint.h define:
> > > 
> > > #define TRACE_EVENT_API(a,b,c,d,e) TRACE_EVENT(a,b,c,d,e)
> > 
> > unfortunately, due to the preprocessor trickery around TRACE_EVENT
> > this completely barfs.
> 
> I forgot to tell you about PARAMS.
> 
> This patch compiled for me;
> 

your magic skills exceed mine ;-)

mind sending me a signoff for this ?



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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