forked from luck/tmp_suning_uos_patched
[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>
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@ -248,10 +248,17 @@ acpi_parse_lapic(acpi_table_entry_header * header, const unsigned long end)
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acpi_table_print_madt_entry(header);
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/* Register even disabled CPUs for cpu hotplug */
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x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
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/* Record local apic id only when enabled */
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if (processor->flags.enabled)
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x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
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/*
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* We need to register disabled CPU as well to permit
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* counting disabled CPUs. This allows us to size
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* cpus_possible_map more accurately, to permit
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* to not preallocating memory for all NR_CPUS
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* when we use CPU hotplug.
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*/
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mp_register_lapic(processor->id, /* APIC ID */
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processor->flags.enabled); /* Enabled? */
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