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

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Message-ID: <c62985530812231951p4a943007j6d4a8632ee241921@mail.gmail.com>
Date:	Wed, 24 Dec 2008 04:51:04 +0100
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Steven Rostedt" <rostedt@...dmis.org>
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

2008/12/24 Steven Rostedt <rostedt@...dmis.org>:
>
> 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

Ok, I will try with this solution.

Thanks.
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