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The Online Capable bit is introduced in ACPI 6.3 and MADT.revision 5. However, as currently coded, for MADT.revision < 5, acpi_is_processor_usable() no longer allows for possible hot pluggable cpus, which is a regressive change in behavior. This patch restores the behavior where for MADT.revision < 5, the presence of the lapic/x2apic structure implies a possible hotpluggable cpu. Fixes: e2869bd7af60 ("x86/acpi/boot: Do not register processors that cannot be onlined for x2APIC") Suggested-by: Miguel Luis Suggested-by: Boris Ostrovsky Signed-off-by: Eric DeVolder Reviewed-by: Mario Limonciello Tested-by: David R --- arch/x86/kernel/acpi/boot.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 1c38174b5f01..7b5b8ed018b0 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -193,7 +193,13 @@ static bool __init acpi_is_processor_usable(u32 lapic_flags) if (lapic_flags & ACPI_MADT_ENABLED) return true; - if (acpi_support_online_capable && (lapic_flags & ACPI_MADT_ONLINE_CAPABLE)) + /* + * Prior to MADT.revision 5, the presence of the Local x2/APIC + * structure _implicitly_ noted a possible hotpluggable cpu. + * Starting with MADT.revision 5, the Online Capable bit + * _explicitly_ indicates a hotpluggable cpu. + */ + if (!acpi_support_online_capable || (lapic_flags & ACPI_MADT_ONLINE_CAPABLE)) return true; return false;