linux-kernel - Re: EDAC lockdep splat

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Date:	Wed, 10 Jul 2013 12:41:15 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...radead.org>
Subject: Re: EDAC lockdep splat

Forgot to CC him.

On Wed, Jul 10, 2013 at 12:39:15PM +0200, Borislav Petkov wrote:
> On Wed, Jul 10, 2013 at 11:57:33AM +0200, Markus Trippelsdorf wrote:
> > While debugging an unrelated issue I came across the following lockdep
> > splat:
> 
> …
> 
> > Jul 10 11:38:00 x4 kernel: BUG: key ffff8802169693f8 not in .data!
> > Jul 10 11:38:00 x4 kernel: ------------[ cut here ]------------
> > Jul 10 11:38:00 x4 kernel: WARNING: CPU: 3 PID: 1 at kernel/lockdep.c:2987 lockdep_init_map+0x45e/0x490()
> > Jul 10 11:38:00 x4 kernel: sda: unknown partition table
> > Jul 10 11:38:00 x4 kernel: DEBUG_LOCKS_WARN_ON(1)
> 
> I know: http://marc.info/?l=linux-kernel&m=136809709202740&w=2
> 
> I was expecting Mauro to fix it since his patches grew this out:
> 
> commit 7a623c039075e4ea21648d88133fafa6dcfd113d
> Author: Mauro Carvalho Chehab <mchehab@...hat.com>
> Date:   Mon Apr 16 16:41:11 2012 -0300
> 
>     edac: rewrite the sysfs code to use struct device
> 
> adds struct bus_type to struct mem_ctl_info which is dynamically
> allocated and that's why lockdep complains.
> 
> bus_register() needs to get a statically allocated struct bus_type as
> the rest of the kernel does it.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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