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Subject: Re: Oops in trace_hardirqs_on (powerpc)
From: Steven Rostedt <rostedt@goodmis.org>
To: =?ISO-8859-1?Q?J=F6rg?= Sommer <joerg@alea.gnuu.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>, Ingo Molnar <mingo@redhat.com>,
        linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org
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Date: Mon, 27 Sep 2010 21:58:14 -0400
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On Mon, 2010-09-27 at 14:50 +0200, Jörg Sommer wrote:
> Hello Steven,
> 
> Steven Rostedt hat am Wed 22. Sep, 15:44 (-0400) geschrieben:
> > Sorry for the late reply, but I was on vacation when you sent this, and
> > I missed it while going through email.
> > 
> > Do you still have this issue?
> 
> No. I've rebuild my kernel without TRACE_IRQFLAGS and the problem
> vanished, as expected. The problem is, that in some cases the stack is
> only two frames deep, which causes the macro CALLER_ADDR1 makes an
> invalid access. Someone told me, there a workaround for the problem on
> i386, too.
> 
> % sed -n 2p arch/x86/lib/thunk_32.S
>  * Trampoline to trace irqs off. (otherwise CALLER_ADDR1 might crash)

Yes, I remember that problem. When I get back from Tokyo, I'll tried to
remember to fix it.

Thanks!

-- Steve