linux-kernel - Re: [announce] "kill the Big Kernel Lock (BKL)" tree

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Message-ID: <alpine.LFD.1.10.0805141510120.3019@woody.linux-foundation.org>
Date:	Wed, 14 May 2008 15:11:39 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexander Viro <viro@....linux.org.uk>
Subject: Re: [announce] "kill the Big Kernel Lock (BKL)" tree



On Wed, 14 May 2008, Alan Cox wrote:
> 
> Here is a fun one for general discussion - right now driver probe
> functions request resources. We have no ordering on the requests so we
> have deadlocks if two drivers do resource requests for conflicting
> resources in reverse order.

resource requests aren't blocking, so it wouldn't actually be a deadlock. 
It would just be a "both failed, try again".

That said, two drivers shouldn't be probing the same hardware at the same 
time regardless, so I can't imagine that it's much of a problem in real 
life. 

		Linus
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