linux-kernel - Re: nmi_watchdog fix for x86

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Message-ID: <20071001201147.GF29100@linux.vnet.ibm.com>
Date:	Mon, 1 Oct 2007 13:11:47 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, 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, Oct 01, 2007 at 12:56:26PM -0700, Arjan van de Ven wrote:
> 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

Last I tried it, x86_64 and i386 in fact prohibit hotunplugging CPU 0.

						Thanx, Paul
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