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

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Date:	Wed, 16 Jul 2008 11:32:03 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Steven Rostedt" <rostedt@...dmis.org>
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, 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.


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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