linux-kernel - Re: 2.6.23-rc2: WARNING: at kernel/irq/resend.c:70 check_irq

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Message-ID: <20070810082346.GD1764@ff.dom.local>
Date:	Fri, 10 Aug 2007 10:23:46 +0200
From:	Jarek Poplawski <jarkao2@...pl>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	John Stoffel <john@...ffel.org>, linux-kernel@...r.kernel.org,
	shemminger@...ux-foundation.org, vignaud@...dmail.fr,
	marcin.slusarz@...il.com, mingo@...e.hu,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, linux-net@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: 2.6.23-rc2: WARNING: at kernel/irq/resend.c:70 check_irq_resend()

On Fri, Aug 10, 2007 at 10:05:40AM +0200, Thomas Gleixner wrote:
> On Thu, 2007-08-09 at 17:54 +0200, Jarek Poplawski wrote:
> > I'm not sure I don't miss anything (a little in hurry now), but this
> > warning's aim was purely diagnostical and nothing wrong is meant!
> > Unless there is something wrong... Then please try to be more explicit.
> > 
> > If you prefer to not see this, there is my patch proposal somewhere
> > in this older thread:
> > Subject: [patch] genirq: temporary fix for level-triggered IRQ resend
> > Date: Wed, 8 Aug 2007 13:00:37 +0200
> > 
> > On the other hand, if it works OK, it would be better to let it be
> > tested more like this...
> 
> Hmm. This solution is still just pampering over the real problem. The
> delayed disable just re-sends level interrupts unnecessarily. I have a
> fix (needs some testing) for this, which I send out tomorrow, when I'm
> really back from vacation.
> 
> But suppressing the resend is not fixing the driver problem. The problem
> can show up with spurious interrupts and with interrupts on a shared PCI
> interrupt line at any time. It just might take weeks instead of minutes.

Doesn't it look like a little change of mind? Well, there are probably
(but need more testing) two other solutions: _SW_RESEND and disabling
without delay for levels only...

Jarek P.
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