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

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Message-ID: <877idw7ct5.fsf@basil.nowhere.org>
Date:	Thu, 15 May 2008 00:15:02 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.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

Alan Cox <alan@...rguk.ukuu.org.uk> writes:

> Out of amusement I took the watchdog drivers and started looking for
> large cans of worms in the BKL drop arena.
>
> 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.

What deadlocks? resource allocation normally doesn't block. So if there's
a ordering issue one of them will fail and should bail out.

That said if you have conflicting resources then failing is the correct
behavior anyways.

-Andi
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