linux-kernel - Re: [tip:irq/numa] x86: read apic ID in the !acpi

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Date:	Tue, 12 May 2009 11:31:04 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Cyrill Gorcunov <gorcunov@...il.com>, mingo@...hat.com,
	hpa@...or.com, linux-kernel@...r.kernel.org, tglx@...utronix.de,
	eswierk@...stanetworks.com, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:irq/numa] x86: read apic ID in the !acpi_lapic case

Ingo Molnar wrote:
> got this on a testbox:
> 
> [    0.113333] WARNING: at arch/x86/kernel/apic/apic.c:253 warn_slowpath_null+0x28/0x50()
> 
> 	Ingo
> 
> [    0.000000] Initializing cgroup subsys cpuset
> [    0.000000] Linux version 2.6.30-rc5-tip-01553-g4bc9bac-dirty (mingo@...ius) (gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC) ) #48764 SMP PREEMPT Tue May 12 18:30:18 CEST 2009
> [    0.000000] Command line: root=/dev/sda1 earlyprintk=serial,ttyS0,115200 console=ttyS0,115200 console=tty debug initcall_debug apic=verbose sysrq_always_enabled 5 ignore_loglevel nosmp no_hz=off highres=0 nmi_watchdog=0 noapic nolapic_timer hpet=disable idle=poll notsc acpi=off

you should use
nolapic and noapic_timer

/* same as disableapic, for compatibility */
static int __init setup_nolapic(char *arg)
{
        return setup_disableapic(arg);
}
early_param("nolapic", setup_nolapic);

static int __init parse_disable_apic_timer(char *arg)
{
        disable_apic_timer = 1;
        return 0;
}
early_param("noapictimer", parse_disable_apic_timer);
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