linux-kernel - Re: 4d3702b6 (post-v2.6.26): WARNING: at kernel/lockdep.c:2731 check

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Date:	Wed, 16 Jul 2008 07:36:37 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Vegard Nossum <vegard.nossum@...il.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: 4d3702b6 (post-v2.6.26): WARNING: at kernel/lockdep.c:2731
 check_flags (ftrace)


On Wed, 16 Jul 2008, Vegard Nossum wrote:

>
> On Wed, Jul 16, 2008 at 6:13 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
> > Things get weird between lockdep and ftrace because ftrace can be called
> > within lockdep internal code (via the mcount pointer) and lockdep can be
> > called with ftrace (via spin_locks).
> >
> > Can you try this patch out and see if it fixes your problem. I only
> > compiled tested it.
> >
> > Note: I'll be traveling for the next couple of weeks, so I will be on and
> > off with email.
> >
> > Signed-off-by: Steven Rostedt <srostedt@...hat.com>
> > ---
> >  kernel/trace/trace_sched_wakeup.c |   27 ++++++++++++++++-----------
> >  1 file changed, 16 insertions(+), 11 deletions(-)
>
> Works for me! :-)
>
> There's no warning during self-tests. But then again, I didn't try
> tracing anything else either.

Great!

Ingo or Thomas, can you include this patch.

-- Steve

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