linux-kernel - Re: linux-next: Tree for July 18: warning at kernel/lockdep.c:2068 trace_hardirqs_on

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Message-ID: <20080719232021.GA6476@suse.de>
Date:	Sat, 19 Jul 2008 16:20:21 -0700
From:	Greg KH <gregkh@...e.de>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Mariusz Kozlowski <m.kozlowski@...land.pl>,
	Dave Hansen <haveblue@...ibm.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	kernel-testers@...r.kernel.org, linux-next@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Bernhard Walle <bwalle@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: linux-next: Tree for July 18: warning at kernel/lockdep.c:2068
	trace_hardirqs_on_caller

On Sun, Jul 20, 2008 at 01:11:36AM +0200, Vegard Nossum wrote:
> On Sun, Jul 20, 2008 at 12:58 AM, Greg KH <gregkh@...e.de> wrote:
> >> firmware_map_add_early() is using bootmem for the allocation. So yes,
> >> I guess it should possible to use kobjects here. That said, this code
> >> is in fact fairly recent:
> >>
> >> commit 69ac9cd629ca96e59f34eb4ccd12d00b2c8276a7
> >> Author: Bernhard Walle <bwalle@...e.de>
> >> Date:   Fri Jun 27 13:12:54 2008 +0200
> >>
> >>     sysfs: add /sys/firmware/memmap
> >>
> >> I'll add the Cc. I still have a feeling that the kobject patch should
> >> expect to run even when slab is not available.
> >
> > I never has been expected to do so in the past, so odds are, lots of
> > things might break :(
> 
> Yeah. Maybe you should withdraw your ack? :-D
> 
>     Signed-off-by: Bernhard Walle <bwalle@...e.de>
>     Acked-by: Greg KH <gregkh@...e.de>
>     Acked-by: Vivek Goyal <vgoyal@...hat.com>
>     Cc: kexec@...ts.infradead.org
>     Cc: yhlu.kernel@...il.com
>     Signed-off-by: Ingo Molnar <mingo@...e.hu>

Heh, I didn't realize that this ran so early in the boot process, the
code logically looks correct :)

> I'm sorry for having been a bit rash earlier -- it's the combination
> of the patches that produce the failure; they both seem okay on their
> own. On the other hand, this is what -next is for, isn't it?

Yup.

> Maybe the firmware memmap code can simply run a little later in the
> boot sequence?

Possibly.  I wonder why this is only a problem on your machine and not
on anything that Ingo tested?

thanks,

greg k-h
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