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Date: Wed, 2 Dec 2009 18:15:29 -0500 From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> To: "H. Peter Anvin" <hpa@...or.com> Cc: Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...hat.com>, akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>, mingo@...hat.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 * H. Peter Anvin (hpa@...or.com) wrote: > On 12/02/2009 02:57 PM, Mathieu Desnoyers wrote: > >> > >> 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) > > > > Yep, it looks good! It's self-descriptive and don't require to explain > > what the thing is doing each time we refer to it. (however I feel a bit > > sad for Fred, Wilma and Barney) ;) > > > > Although you have to admit it's a bit confusing that: > > TRACE_EVENT = TRACE_CLASS + TRACE_CLASS_EVENT > > ... as opposed to ... > > TRACE_CLASS_EVENT = TRACE_CLASS + TRACE_EVENT > > -hpa Then I would say that TRACE_EVENT should probably not have the side-effect of declaring a globally-reuseable class. Maybe under the hood it could create a privately-named class, but I don't see how it can be re-used by following TRACE_CLASS_EVENT without causing confusion. I'd go for: TRACE_CLASS - Declares/defines a class TRACE_CLASS_EVENT - Declares/defines an event for said class TRACE_EVENT - Declares/defines a private class and declares/defines an event Mathieu > > -- > H. Peter Anvin, Intel Open Source Technology Center > I work for Intel. I don't speak on their behalf. > -- Mathieu Desnoyers OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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