linux-kernel - Re: [PATCH 2/9 - v2][RFC] tracing: Let tracepoints have data passed to tracepoint callbacks

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Date:	Fri, 07 May 2010 15:10:12 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	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>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Christoph Hellwig <hch@....de>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH 2/9 - v2][RFC] tracing: Let tracepoints have data
 passed to tracepoint callbacks

On Fri, 2010-05-07 at 20:06 +0200, Frederic Weisbecker wrote:

> No, what I meant is that you have:
> 
> #ifdef CONFIG_TRACEPOINTS
> [...]
> +#define DECLARE_TRACE_NOARGS(name)                                       \
>       __DECLARE_TRACE(name, void, , void *__data, __data)
> 
> #define DECLARE_TRACE(name, proto, args)                         \
>       __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),      \
>                       PARAMS(proto, void *__data),            \
>                       PARAMS(args, __data))
> [...]
> #else
> [...]
> +#define DECLARE_TRACE_NOARGS(name)                                       \
>       __DECLARE_TRACE(name, void, , void *__data, __data)
> 
> #define DECLARE_TRACE(name, proto, args)                         \
>       __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),      \
>                       PARAMS(proto, void *__data),            \
>                       PARAMS(args, __data)
> [...]
> #endif
> 
> 
> See? They seem to be the exact same version, so this could be only
> one version outside the ifdef.
> And the CONFIG_TRACEPOINTS on/off case is dealt from __DECLARE_TRACE().

Ah, I see (said the blind man as he slipped and fell on the ice).

-- Steve



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