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Date:	Mon, 9 Nov 2009 16:34:18 +0100
From:	Jens Axboe <>
To:	Ingo Molnar <>
Cc:	Tejun Heo <>, Jiri Kosina <>,
	Peter Zijlstra <>,
	Yinghai Lu <>,
	Thomas Gleixner <>,,
Subject: Re: irq lock inversion

On Sun, Nov 08 2009, Ingo Molnar wrote:
> * 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.

I think the primary problem is that it tries to condense too much
information, instead of just spelling it out. That may be obvious to a
person intimately familiar with lockdep, but not to others. Things like
the STATE line, for instance. It would read a lot easier if these things
were just spelled out.

I know this message isn't really productive, just tossing it out there.
I'll try to to back it up with a patch the next time it annoys me :-)

Jens Axboe

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