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

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Message-Id: <1259855773.12870.137.camel@gandalf.stny.rr.com>
Date:	Thu, 03 Dec 2009 10:56:13 -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 Thu, 2009-12-03 at 10:31 -0500, Masami Hiramatsu wrote:
> Steven Rostedt wrote:

> >> Would you mean putting those headers in sub-system's directory?
> >> (e.g. fs/ext4/)
> >> In that case, a problem will happen when user want to hook those
> >> tracepoint from their module, because it is hard to find those
> >> local headers.
> > 
> > Why? Modules usually do have their own headers in their sub system.
> 
> Module's local headers usually uses only from itself. Other modules
> may not touch it. However, AFAIK, event definitions must be referred
> by event consumer which is another module. IOW, those local headers
> will not be included in kernel-headers/kernel-devel package :-(

I'm a little confused. Who is the event consumer? The trace point user?
The one that hooks into the tracepoint?

-- Steve


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