linux-kernel - Re: [PATCH 0/8] [GIT PULL] TRACE

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Date:	Tue, 14 Apr 2009 18:00:26 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Frank Ch. Eigler" <fche@...stic.org>
cc:	Theodore Tso <tytso@....edu>, 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>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@....de>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	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>,
	Tom Zanussi <tzanussi@...il.com>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Michael Rubin <mrubin@...gle.com>,
	Martin Bligh <mbligh@...gle.com>
Subject: Re: [PATCH 0/8] [GIT PULL] TRACE_EVENT for modules


On Tue, 14 Apr 2009, Frank Ch. Eigler wrote:

> Hi -
> 
> On Tue, Apr 14, 2009 at 05:04:45PM -0400, Theodore Tso wrote:
> > [...]
> > One thing which I would really like is to avoid needing to drop the
> > header file in include/trace/<subsystem.h>.
> > 
> > The problem that I have with this is that for ext4, we need to access
> > private data structures which are defined in header files in
> > fs/ext4/*.h --- which we moved into fs/ext4 a long time ago [...]
> 
> If the tracepoints/events expand to code that exposes those private
> structures, then those structures are perhaps not quite so private any
> more.  That argues for moving those headers back under include/..., or
> at least those type decls made reachable from the tracepoints.

I think those headers are fine. This must also work when ext4 is a module.

-- Steve

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