1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 526387dc3799..e67144cf3c8b 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -1108,6 +1108,7 @@ static const struct file_operations acpi_processor_power_fops = {
         .release = single_release,
 };
 
+#ifdef CONFIG_SMP
 static void smp_callback(void *v)
 {
         /* we already woke the CPU up, nothing more to do */
@@ -1129,6 +1130,7 @@ static int acpi_processor_latency_notify(struct notifier_block *b,
 static struct notifier_block acpi_processor_latency_notifier = {
         .notifier_call = acpi_processor_latency_notify,
 };
+#endif
 
 int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
                               struct acpi_device *device)
@@ -1146,7 +1148,9 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
                                "ACPI: processor limited to max C-state %d\n",
                                max_cstate);
                 first_run++;
+#ifdef CONFIG_SMP
                 register_latency_notifier(&acpi_processor_latency_notifier);
+#endif
         }
 
         if (!pr)
@@ -1218,7 +1222,9 @@ int acpi_processor_power_exit(struct acpi_processor *pr,
                  * copies of pm_idle before proceeding.
                  */
                 cpu_idle_wait();
+#ifdef CONFIG_SMP
                 unregister_latency_notifier(&acpi_processor_latency_notifier);
+#endif
         }
 
         return 0;