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

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Date:	Mon, 21 Apr 2008 22:48:02 +0200
From:	Jean Delvare <jdelvare@...e.de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.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>
Subject: Re: PCI MSI breaks when booting with nosmp

Hi Andi,

Le lundi 21 avril 2008, Andi Kleen a écrit :
> > In my case, booting with noapic works fine, so I don't think that the problem
> > is related to APIC being disabled.
> 
> noapic is not the same as no ioapic. maxcpus=0 just disables the IO-APIC
> but not the local APIC.

>From init/main.c:

static int __init maxcpus(char *str)
{
	get_option(&str, &setup_max_cpus);
	if (setup_max_cpus == 0)
		disable_ioapic_setup();

	return 0;
}
early_param("maxcpus", maxcpus);

>From arch/x86/kernel/io_apic_32.c:

static int __init parse_noapic(char *arg)
{
	/* disable IO-APIC */
	disable_ioapic_setup();
	return 0;
}
early_param("noapic", parse_noapic);

Both call disable_ioapic_setup(), so how can they not be the same?

-- 
Jean Delvare
Suse L3
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