1 files changed, 5 insertions, 0 deletions

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index c55263b3df0..0c43e1f2e7d 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1145,6 +1145,11 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
         current_thread_info()->cpu = 0;  /* needed? */
         set_cpu_sibling_map(0);
 
+#ifdef CONFIG_X86_64
+        enable_IR_x2apic();
+        setup_apic_routing();
+#endif
+
         if (smp_sanity_check(max_cpus) < 0) {
                 printk(KERN_INFO "SMP disabled\n");
                 disable_smp();