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x86: fix early panic with boot option "nosmp"

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Impact: fix boot crash with numcpus=0 on certain systems

Fix early exception in __get_smp_config with nosmp.

Bail out early when there is no MP table.

Reported-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Tested-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Andi Kleen 2008-12-04 13:33:35 +01:00 committed by Ingo Molnar
parent 66a05d6b47
commit 9adc13867e
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kernel/mpparse.c
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@ -604,6 +604,9 @@ static void __init __get_smp_config(unsigned int early)
printk(KERN_INFO "Using ACPI for processor (LAPIC) "
"configuration information\n");
if (!mpf)
return;
printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
mpf->mpf_specification);
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)