diff --git a/arch/m32r/kernel/smpboot.c b/arch/m32r/kernel/smpboot.c
index f9a0e723478d..640d592ea072 100644
--- a/arch/m32r/kernel/smpboot.c
+++ b/arch/m32r/kernel/smpboot.c
@@ -91,6 +91,7 @@ extern struct {
 
 /* which physical physical ID maps to which logical CPU number */
 static volatile int physid_2_cpu[NR_CPUS];
+#define physid_to_cpu(physid)	physid_2_cpu[physid]
 
 /* which logical CPU number maps to which physical ID */
 volatile int cpu_2_physid[NR_CPUS];
diff --git a/include/asm-m32r/smp.h b/include/asm-m32r/smp.h
index b9a20cdad65f..7885b7df84a2 100644
--- a/include/asm-m32r/smp.h
+++ b/include/asm-m32r/smp.h
@@ -61,9 +61,7 @@ extern physid_mask_t phys_cpu_present_map;
  * Some lowlevel functions might want to know about
  * the real CPU ID <-> CPU # mapping.
  */
-extern volatile int physid_2_cpu[NR_CPUS];
 extern volatile int cpu_2_physid[NR_CPUS];
-#define physid_to_cpu(physid)	physid_2_cpu[physid]
 #define cpu_to_physid(cpu_id)	cpu_2_physid[cpu_id]
 
 #define raw_smp_processor_id()	(current_thread_info()->cpu)