linux-kernel - Re: [PATCH 1/3] Increase lockdep limits: MAX_STACK_TRACE

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Date:	Thu, 09 Jul 2009 10:02:36 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Dave Jones <davej@...hat.com>
Cc:	Joao Correia <joaomiguelcorreia@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH 1/3] Increase lockdep limits: MAX_STACK_TRACE_ENTRIES

On Thu, 2009-07-09 at 00:39 -0400, Dave Jones wrote:
> On Wed, Jul 08, 2009 at 08:36:04PM +0200, Peter Zijlstra wrote:
>  > Looking at a lockdep dump hch gave me I can see that that is certainly
>  > possible, I see tons of very deep callchains.
>  > 
>  > /me wonders if we're getting significantly deeper..
> 
> Looking at /proc/lockdep, I'm curious..
> Take a look at http://davej.fedorapeople.org/lockdep
> scroll down to c12c0924
> 
> What's up with all those old_style_spin_init's ?

What kernel are you running? Does your lib/dma_debug.c:dma_debug_init()
have spin_lock_init() in that HASH_SIZE loop?

If so, then there's someone else doing silly, if not, you seriously need
to upgrade your kernel because you're running something ancient,
like .30 :-)

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