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

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Message-ID: <alpine.DEB.1.10.0810161421530.11042@gandalf.stny.rr.com>
Date:	Thu, 16 Oct 2008 14:22:48 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Josh Boyer <jwboyer@...ux.vnet.ibm.com>
cc:	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, 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.

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

-- Steve

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