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[PATCH] x86_64: Dont record local apic ids when they are disabled in MADT 

Some broken BIOS's had processors disabled, but
same apic id as a valid processor. This causes
acpi_processor_start() to think this disabled
cpu is ok, and croak. So we dont record bad
apicid's anymore.

http://bugzilla.kernel.org/show_bug.cgi?id=5930

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ashok Raj 2006-02-03 21:51:50 +01:00 committed by Linus Torvalds
parent d646bce4c7
commit 7f66ae48de
1 changed files with 10 additions and 3 deletions
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13
arch/i386/kernel/acpi/boot.c
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@ -248,10 +248,17 @@ acpi_parse_lapic(acpi_table_entry_header * header, const unsigned long end)
acpi_table_print_madt_entry(header);
/* Register even disabled CPUs for cpu hotplug */
x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
/* Record local apic id only when enabled */
if (processor->flags.enabled)
x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
/*
* We need to register disabled CPU as well to permit
* counting disabled CPUs. This allows us to size
* cpus_possible_map more accurately, to permit
* to not preallocating memory for all NR_CPUS
* when we use CPU hotplug.
*/
mp_register_lapic(processor->id, /* APIC ID */
processor->flags.enabled); /* Enabled? */