linux-kernel - Re: nmi_watchdog fix for x86

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Message-ID: <20071001125626.32eb6d0b@laptopd505.fenrus.org>
Date:	Mon, 1 Oct 2007 12:56:26 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Andi Kleen <ak@...e.de>, David Bahi <dbahi@...ell.com>,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Gregory Haskins <GHaskins@...ell.com>
Subject: Re: nmi_watchdog fix for x86_64 to be more like i386

On Mon, 1 Oct 2007 21:27:39 +0200 (CEST)

> > I already did this here by checking for cpu != 0. But it also needs
> > either tracking or forbidding migrations of irq 0. I can take care
> > of the patch.
> 
> I was thinking about the same fix. On i386 we already have the irq 
> migration / balancing of irq 0 disabled. That's why we setup IRQ0 with
> IRQ_NOBALANCING.

btw doing this is a problem if the user decides to hot(un)plug cpu 0...
he then can't move the irqs away to do that
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