Date: Tue, 21 Apr 2009 22:28:28 +0200
From: Andi Kleen <andi@firstfloor.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
       Mathieu Desnoyers <compudj@krystal.dyndns.org>,
       Andi Kleen <andi@firstfloor.org>, linux-kernel@vger.kernel.org,
       Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@linux-foundation.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Peter Zijlstra <peterz@infradead.org>,
       Frederic Weisbecker <fweisbec@gmail.com>, Theodore Tso <tytso@mit.edu>,
       Arjan van de Ven <arjan@infradead.org>, Christoph Hellwig <hch@lst.de>,
       Lai Jiangshan <laijs@cn.fujitsu.com>, Zhaolei <zhaolei@cn.fujitsu.com>,
       Li Zefan <lizf@cn.fujitsu.com>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       Masami Hiramatsu <mhiramat@redhat.com>,
       "Frank Ch. Eigler" <fche@elastic.org>, Tom Zanussi <tzanussi@gmail.com>,
       Jiaying Zhang <jiayingz@google.com>, Michael Rubin <mrubin@google.com>,
       Martin Bligh <mbligh@google.com>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Neil Horman <nhorman@tuxdriver.com>,
       Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>,
       Pekka@firstfloor.org
Subject: Re: [PATCH 2/8] tracing: create automated trace defines
Message-ID: <20090421202828.GB32179@basil>
References: <49E51FC1.8090306@goop.org> <20090415014548.GA7984@Krystal> <49E6065B.7080409@goop.org> <20090416023456.GC22378@Krystal> <49E69E76.9030608@goop.org> <20090416234410.GA20513@Krystal> <87zlebpzmk.fsf@basil.nowhere.org> <20090421155106.GE3792@Krystal> <49EDFFE6.1080401@goop.org> <alpine.DEB.2.00.0904211320440.10097@gandalf.stny.rr.com>
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> 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@linux.intel.com -- Speaking for myself only.
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