linux-kernel - Re: [PATCH 2/8] tracing: create automated trace defines

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Date:	Wed, 15 Apr 2009 22:34:56 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	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>,
	Christoph Hellwig <hch@....de>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Zhaolei <zhaolei@...fujitsu.com>, Li Zefan <lizf@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	"Frank Ch. Eigler" <fche@...stic.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Michael Rubin <mrubin@...gle.com>,
	Martin Bligh <mbligh@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Neil Horman <nhorman@...driver.com>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH 2/8] tracing: create automated trace defines

* Jeremy Fitzhardinge (jeremy@...p.org) wrote:
> Mathieu Desnoyers wrote:
>> * Jeremy Fitzhardinge (jeremy@...p.org) wrote:
>>> -#define __DO_TRACE(tp, proto, args)					\
>>> -	do {								\
>>> +#define DEFINE_DO_TRACE(name, proto, args)				\
>>> +	void __do_trace_##name(struct tracepoint *tp, TP_PROTO(proto))	\
>>>     
>>
>> I fear that won't work with "void" prototype. If we need this kind of
>> flexibility, we will need to create a special case for empty prototype.
>>   
>
> Yes, that has been a bit awkward.  I couldn't find a way to create a  
> no-param tracepoint, and so ended up passing a dummy arg.  Stupid C 
> syntax.
>
> On the other hand, I can get something that actually compiles this way...
>
>    J

Is your only problem the fact that tracepoints include rcupdate.h ? This
can easily be solved by moving rcu_read_(un)lock_sched_notrace to a
rcu-update-<insert meaningful name here> and include this header in
rcupdate.h and tracepoint.h.

We could keep the indirection layer you proposed for synchronize_sched()
though, even if it adds an unnecessary function call. It's a slow path
anyway.

If by doing these modifications we succeed in keeping the "void"
parameters working _and_ make your stuff to compile, I think we would
have done something great. :-)

Mathieu

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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