linux-kernel - Re: [patch] spinlock debug: make looping nicer

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Date:	Thu, 21 Jun 2007 23:15:25 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	Chuck Ebbert <cebbert@...hat.com>,
	Jarek Poplawski <jarkao2@...pl>,
	Miklos Szeredi <miklos@...redi.hu>, chris@...ee.ca,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	akpm@...ux-foundation.org
Subject: Re: [patch] spinlock debug: make looping nicer


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Thu, 21 Jun 2007, Ingo Molnar wrote:
> > 
> > btw., back then we also tried a spin_is_locked() based inner loop 
> > but it didnt help the ->tree_lock lockups either. In any case i very 
> > much agree that the 'nicer' looping should be added again - the 
> > patch below does that. (build and boot tested)
> 
> Ok, I'm definitely not going to apply it right now, though.

yeah, very much so. Lots of distros ship with spinlock debugging enabled 
(at least in their betas), we dont want to break that accidentally.

	Ingo
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