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-rw-r--r--arch/x86/kernel/apic_32.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index 7783c113be2..7ef7c782a42 100644
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -878,6 +878,12 @@ int __init verify_local_APIC(void)
*/
reg0 = apic_read(APIC_ID);
apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0);
+ apic_write(APIC_ID, reg0 ^ APIC_ID_MASK);
+ reg1 = apic_read(APIC_ID);
+ apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1);
+ apic_write(APIC_ID, reg0);
+ if (reg1 != (reg0 ^ APIC_ID_MASK))
+ return 0;
/*
* The next two are just to see if we have sane values.