1 files changed, 5 insertions, 0 deletions

diff --git a/arch/x86/kernel/apic.c b/arch/x86/kernel/apic.c
index 9ca12af6c876..1df341a528a1 100644
--- a/arch/x86/kernel/apic.c
+++ b/arch/x86/kernel/apic.c
@@ -1844,6 +1844,11 @@ void __cpuinit generic_processor_info(int apicid, int version)
         num_processors++;
         cpu = cpumask_next_zero(-1, cpu_present_mask);
 
+        if (version != apic_version[boot_cpu_physical_apicid])
+                WARN_ONCE(1,
+                        "ACPI: apic version mismatch, bootcpu: %x cpu %d: %x\n",
+                        apic_version[boot_cpu_physical_apicid], cpu, version);
+
         physid_set(apicid, phys_cpu_present_map);
         if (apicid == boot_cpu_physical_apicid) {
                 /*