1 files changed, 5 insertions, 0 deletions

diff --git a/include/asm-x86/smp.h b/include/asm-x86/smp.h
index 654724c58f5b..d973c11688ce 100644
--- a/include/asm-x86/smp.h
+++ b/include/asm-x86/smp.h
@@ -29,10 +29,15 @@ extern int smp_num_siblings;
 extern unsigned int num_processors;
 extern cpumask_t cpu_initialized;
 
+#ifdef CONFIG_SMP
 extern u16 x86_cpu_to_apicid_init[];
 extern u16 x86_bios_cpu_apicid_init[];
 extern void *x86_cpu_to_apicid_early_ptr;
 extern void *x86_bios_cpu_apicid_early_ptr;
+#else
+#define x86_cpu_to_apicid_early_ptr NULL
+#define x86_bios_cpu_apicid_early_ptr NULL
+#endif
 
 DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);
 DECLARE_PER_CPU(cpumask_t, cpu_core_map);