linux-kernel - Re: [PATCH 1/2] tracing/ftrace: don't trace on early stage of secondary cpu boot

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Date:	Tue, 23 Dec 2008 22:33:21 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frédéric Weisbecker <fweisbec@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] tracing/ftrace: don't trace on early stage of
 secondary cpu boot


On Wed, 24 Dec 2008, Fr?d?ric Weisbecker wrote:
> 
> 
> I first thought about annotate those first functions with "notrace".
> But the code inside
> cpu_init/pda_init could change later and call external/traced function.

We could also hit it with the CFLAGS_REMOVE_common.o = -pg hammer.
Those functions will not change much, and I doubt they will call other 
functions for the same reason that we can not call them. A simple 
preempt_disable here will crash the box.

-- Steve

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