linux-kernel - Re: PCI MSI breaks when booting with nosmp

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Message-Id: <200804230812.49548.jbarnes@virtuousgeek.org>
Date:	Wed, 23 Apr 2008 08:12:49 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Jean Delvare <jdelvare@...e.de>
Cc:	Andi Kleen <andi@...stfloor.org>,
	linux-pci@...ey.karlin.mff.cuni.cz,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
	Tejun Heo <htejun@...il.com>,
	Tom Long Nguyen <tom.l.nguyen@...el.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Jeff Garzik <jgarzik@...ox.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: PCI MSI breaks when booting with nosmp

On Wednesday, April 23, 2008 7:38 am Jean Delvare wrote:
> > diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
> > index e6abe8a..7cdf930 100644
> > --- a/arch/x86/kernel/smpboot.c
> > +++ b/arch/x86/kernel/smpboot.c
> > @@ -1138,14 +1138,10 @@ static int __init smp_sanity_check(unsigned
> > max_cpus) "forcing use of dummy APIC emulation.\n");
> >  		smpboot_clear_io_apic();
> >  #ifdef CONFIG_X86_32
> > -		if (nmi_watchdog == NMI_LOCAL_APIC) {
> > -			printk(KERN_INFO "activating minimal APIC for"
> > -					 "NMI watchdog use.\n");
> > -			connect_bsp_APIC();
> > -			setup_local_APIC();
> > -			end_local_APIC_setup();
> > -		}
> > +		connect_bsp_APIC();
> >  #endif
> > +		setup_local_APIC();
> > +		end_local_APIC_setup();
> >  		return -1;
> >  	}
>
> Sorry for the late reply. I tested the patch above on top of 2.6.25-git4
> and yes, it fixes my problem: booting with "nosmp" works now. Thanks!
>
> Is this patch good enough to go upstream, and if so, through whose
> tree? Adding Thomas Gleixner to Cc.

Yeah I think the patch is reasonable, would be good to get feedback from 
Thomas/Andi/Ingo though...

Jesse
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