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Message-ID: <4A09C068.3010308@kernel.org>
Date: Tue, 12 May 2009 11:31:04 -0700
From: Yinghai Lu <yinghai@kernel.org>
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To: Ingo Molnar <mingo@elte.hu>
CC: Cyrill Gorcunov <gorcunov@gmail.com>, mingo@redhat.com, hpa@zytor.com,
       linux-kernel@vger.kernel.org, tglx@linutronix.de,
       eswierk@aristanetworks.com, linux-tip-commits@vger.kernel.org
Subject: Re: [tip:irq/numa] x86: read apic ID in the !acpi_lapic case
References: <49FC85A9.2070702@kernel.org> <tip-4797f6b021a3fa399942245d07a1feb30df81bb8@git.kernel.org> <20090512112205.GA12108@elte.hu> <20090512145128.GA10220@lenovo> <20090512145808.GA20587@elte.hu> <4A099013.6040708@kernel.org> <20090512150631.GA32067@elte.hu> <20090512164617.GA21673@elte.hu>
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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@sirius) (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);