Extending the patch commit aa06e20f1be628186f0c2dcec09ea0009eb69778 to be included for acpi_parse_x2apic as well. There is a check for invalid apicid. However, there are BIOSes with madt verison >= 5 support that do not bother setting apic id to an invalid value since they assume the OS will check the enabled and online capable flags. Signed-off-by: James Puthukattukaran<james.puthukattukaran@xxxxxxxxxx> Reported-by: Benjamin Fuller<ben.fuller@xxxxxxxxxx> --- arch/x86/kernel/acpi/boot.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 907cc98b1938..6dc46909bd9a 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -208,7 +208,14 @@ acpi_parse_x2apic(union acpi_subtable_headers *header, const unsigned long end) apic_id = processor->local_apic_id; enabled = processor->lapic_flags & ACPI_MADT_ENABLED; - /* Ignore invalid ID */ + + /* don't register processors that can not be onlined */ + if (acpi_support_online_capable && + !(processor->lapic_flags & ACPI_MADT_ENABLED) && + !(processor->lapic_flags & ACPI_MADT_ONLINE_CAPABLE)) + return 0; + + /* for systems older than madt version 5, ignore invalid ID */ if (apic_id == 0xffffffff) return 0; -- 2.31.1
