linux-kernel - [RFC PATCH 3/4] powerpc 2.6.16-rt17: to support CONFIG

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Date:	Mon, 21 Aug 2006 18:44:06 +0900
From:	Tsutomu OWA <tsutomu.owa@...hiba.co.jp>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Tsutomu OWA <tsutomu.owa@...hiba.co.jp>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	linuxppc-dev@...abs.org, tsutomu.owa@...hiba.co.jp
Subject: [RFC PATCH 3/4] powerpc 2.6.16-rt17: to support CONFIG_MCOUNT


Sorry about the late response and thanks a lot for your comments.

> On Fri, 11 Aug 2006 07:12:35 -0700, Daniel Walker <dwalker@...sta.com> said:

>> On Fri, 2006-08-11 at 11:02 +0900, Tsutomu OWA wrote:

>> +
>> +#if defined(CONFIG_PREEMPT_TRACE) || defined(CONFIG_LATENCY_TRACE)
>> +        print_traces(current);
>> +#endif /* CONFIG_PREEMPT_TRACE || CONFIG_LATENCY_TRACE */

> You shouldn't need the ifdef's here.

  Right.  I'll remove them.

>> +#ifdef CONFIG_DEBUG_MUTEXES
>> +	show_held_locks(current);
>> +#endif /* CONFIG_DEBUG_MUTEXES */
>> +
>> }
>> EXPORT_SYMBOL(dump_stack);
>> 
>> diff -rup -x CVS 2.6.16-rt17/arch/powerpc/kernel/prom.c rt-powerpc/arch/powerpc/kernel/prom.c

> Your on an ancient version of the -rt patch. I see that your using CVS
> which explains that. If you want to keep better pace you should consider
> not using CVS. 

  Hmm... I'll think about that.

>> diff -rup -x CVS 2.6.16-rt17/lib/string.c rt-powerpc/lib/string.c
>> --- 2.6.16-rt17/lib/string.c	2006-03-20 14:53:29.000000000 +0900
>> +++ rt-powerpc/lib/string.c	2006-06-16 13:08:07.000000000 +0900
>> @@ -67,7 +67,7 @@ EXPORT_SYMBOL(strnicmp);
>> * @src: Where to copy the string from
>> */
>> #undef strcpy
>> -char *strcpy(char *dest, const char *src)
>> +char * notrace strcpy(char *dest, const char *src)
>> {
>> char *tmp = dest;

> Why are these notrace ?

  Because these are called from prom_init before the relocation.
I was a bit reluctant to calcurate the address of mcount_enabled,
every time _mcount is called and was not sure if it's ok to call
__trace() at this early stage.

thanks.
-- owa
Software Engineering Center, TOSHIBA.
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