linux-kernel - Re: 2.6.24-rc7-rt2 [PATCH] latency tracer fix for ppc32

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Date:	Wed, 16 Jan 2008 13:03:07 +0100
From:	Luotao Fu <l.fu@...gutronix.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Luotao Fu <l.fu@...gutronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.24-rc7-rt2 [PATCH] latency tracer fix for ppc32

Hi Steve,

I found out that the tracer got stuck on ppc32 platforms because some early
functions call _mcount before mcount_enabled is initialized at all. I made a
patch, which marks these functions as notrace to solve this problem. With this
patch I can successfully boot up our mpc5200b platform and make latency trace.
(tested with -b switch in cyclictest). Please comment.

I made my patch against the -rt2 tree since the dummy call early_printk() in
-rt3 conflicts with our implementation of a functional early_printk(). It
should also work with -rt3 though.

cheers
Luotao Fu
-- 
   Dipl.-Ing. Luotao Fu | Phone: +49-5121-206917-3
Pengutronix - Linux Solutions for Science and Industry
Entwicklungszentrum Nord     http://www.pengutronix.de


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