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

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Date:	Tue, 21 Apr 2009 22:28:28 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Andi Kleen <andi@...stfloor.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@...stfloor.org
Subject: Re: [PATCH 2/8] tracing: create automated trace defines

> It is needed for the function tracer (gcc -pg wont work without it). It is 
> the only tracer that selects it.

FWIW i still have gcc patches to fix that. They were first stalled
on copyright assignment and then on gcc's merge window being closed,
but now with 4.5 open for game I hope to resubmit them soon
again.

With that you can use -pg without frame pointer, but you have
to supply a special mcount function that expects the different
stack layout.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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