1 files changed, 8 insertions, 2 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 4558f0d0822d..ce664f33ea8e 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -219,6 +219,8 @@ static int __init
 acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
 {
         struct acpi_madt_local_x2apic *processor = NULL;
+        int apic_id;
+        u8 enabled;
 
         processor = (struct acpi_madt_local_x2apic *)header;
 
@@ -227,6 +229,8 @@ acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
 
         acpi_table_print_madt_entry(header);
 
+        apic_id = processor->local_apic_id;
+        enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
 #ifdef CONFIG_X86_X2APIC
         /*
          * We need to register disabled CPU as well to permit
@@ -235,8 +239,10 @@ acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
          * to not preallocating memory for all NR_CPUS
          * when we use CPU hotplug.
          */
-        acpi_register_lapic(processor->local_apic_id,   /* APIC ID */
-                            processor->lapic_flags & ACPI_MADT_ENABLED);
+        if (!cpu_has_x2apic && (apic_id >= 0xff) && enabled)
+                printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
+        else
+                acpi_register_lapic(apic_id, enabled);
 #else
         printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
 #endif