diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 45119d39f31e79e99e5e9f6789e24494dc63c630..6a7fb1300073d6babea6ff71154257660d1b34ca 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1207,6 +1207,24 @@ void __init native_smp_cpus_done(unsigned int max_cpus)
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
+
+#  ifdef CONFIG_X86_32
+void cpu_exit_clear(void)
+{
+	int cpu = raw_smp_processor_id();
+
+	idle_task_exit();
+
+	cpu_uninit();
+	irq_ctx_exit(cpu);
+
+	cpu_clear(cpu, cpu_callout_map);
+	cpu_clear(cpu, cpu_callin_map);
+
+	unmap_cpu_to_logical_apicid(cpu);
+}
+#  endif /* CONFIG_X86_32 */
+
 void remove_siblinginfo(int cpu)
 {
 	int sibling;
diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index 3a1b9e40cedb6e5eb7860a5231065f6574002c38..5469207fa863030a87a0ab09aa94b7375320d0fd 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -74,25 +74,6 @@ EXPORT_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
 
 u8 apicid_2_node[MAX_APICID];
 
-extern void unmap_cpu_to_logical_apicid(int cpu);
-
-#ifdef CONFIG_HOTPLUG_CPU
-void cpu_exit_clear(void)
-{
-	int cpu = raw_smp_processor_id();
-
-	idle_task_exit();
-
-	cpu_uninit();
-	irq_ctx_exit(cpu);
-
-	cpu_clear(cpu, cpu_callout_map);
-	cpu_clear(cpu, cpu_callin_map);
-
-	unmap_cpu_to_logical_apicid(cpu);
-}
-#endif
-
 /* Where the IO area was mapped on multiquad, always 0 otherwise */
 void *xquad_portio;
 #ifdef CONFIG_X86_NUMAQ