linux-kernel - Re: [PATCH 0/2] ftrace: fixes for PPC

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Date:	Thu, 16 Oct 2008 14:35:29 -0400
From:	Josh Boyer <jwboyer@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	linuxppc-dev@...abs.org, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/2] ftrace: fixes for PPC

On Thu, Oct 16, 2008 at 02:22:48PM -0400, Steven Rostedt wrote:
>
>On Thu, 16 Oct 2008, Josh Boyer wrote:
>
>> On Sat, Sep 06, 2008 at 02:03:47PM +0200, Ingo Molnar wrote:
>> >
>> >* Steven Rostedt <rostedt@...dmis.org> wrote:
>> >
>> >> I spent the day chasing a bug that would hang PPC on boot up when 
>> >> ftrace is configured in. I found that it was simply a stupid bug I did 
>> >> to handle the non MCOUNT_RECORD case. Since I was testing only on x86, 
>> >> and the MCOUNT_RECORD is automatically set for dynamic ftrace if it is 
>> >> available, I did not test the case where MCOUNT_RECORD was not set.
>> >> 
>> >> I have not finished porting MCOUNT_RECORD to PPC, but have found that 
>> >> it has caused some issues for archs that do not support it yet.
>> >> 
>> >> This patch series handles these cases.
>> >
>> >applied to tip/tracing/ftrace, thanks Steve.
>> 
>> Are these two merged yet?  I just spent the better part of the morning
>> trying to figure out why various Fedora kernels based on 2.6.27-rcX and
>> 2.6.27 final hung on my G5 and finally got one booting with FTRACE
>> disabled.
>
>My powerbook does not boot with ftrace enabled. I'm currently debugging 
>it. When I get it working, you'll see patches.

Well, that's why I asked.  You sent 2 patches out over a month ago that
don't appear to have shown up in any Linus or PowerPC tree.

>They will be to linux-tip though, and not for the current mainline (unless 
>the code in linux-tip gets merged).

If linux-tip is some x86 topic branch, I think that's the wrong place for
fixes that are needed on non-x86 arches.

josh
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