linux-kernel - Re: [PATCH] workaround minor lockdep bug triggered by mm_take_all

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Message-ID: <20080804163816.75fa63ba@infradead.org>
Date:	Mon, 4 Aug 2008 16:38:16 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andrea Arcangeli <andrea@...ranet.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Dave Jones <davej@...hat.com>,
	Roland Dreier <rdreier@...co.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, jeremy@...p.org,
	hugh@...itas.com, mingo@...e.hu, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] workaround minor lockdep bug triggered by
 mm_take_all_locks

On Tue, 5 Aug 2008 00:30:11 +0200
Andrea Arcangeli <andrea@...ranet.com> wrote:

> On Mon, Aug 04, 2008 at 02:42:28PM -0700, Arjan van de Ven wrote:
> > yes lockdep will only complain WHEN you take them in the wrong order
> > 
> > But you claimed you would for sure be in a deadlock at that point
> > which is generally not correct.
> 
> I already said I didn't know about that despite having spent a fair
> amount of time trying to understand why lockdep crashes systems at
> boot about an year ago. I admit I didn't understand much about it and
> reducing its computation time didn't look feasible, perhaps my fault,
> and I'm glad if Peter found a way to make it boot after 1 year.

interesting; lockdep has been working for the last.. 2 1/2 years at
least, and I don't remember seeing bugreports against it from you that
would describe it as totally non-functional.


Oh well.. seems you're rather preoccupied about it; that's ok, you're
entitled to your opinion even if I don't agree with it ;-)

-- 
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