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Date:	Sun, 8 Nov 2009 10:38:59 +0100
From:	Ingo Molnar <>
To:	Jens Axboe <>
Cc:	Tejun Heo <>, Jiri Kosina <>,
	Peter Zijlstra <>,
	Yinghai Lu <>,
	Thomas Gleixner <>,,
Subject: Re: irq lock inversion

* Jens Axboe <> wrote:

> On Fri, Nov 06 2009, Ingo Molnar wrote:
> > Read the lockdep message please, consider all the backtraces it prints, 
> > it says something different.
> In all honesty, reading and parsing lockdep messages requires a 
> special state of mind. IOW, readability is not its high point.

We frequently do patches to improve the messages but there's a hard 
limit: generally the messages mirror the complexity of the underlying 
locking scenario.

Unfortunately lockdep cannot pretend something is simple when it is not. 
There are two ways out of that: either to simplify the underlying 
locking rules, or to understand them.

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