diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 0bf2dc1..b79badd 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -44,6 +44,8 @@
 		ret = smp_prepare_cpu(cpu->sysdev.id);
 		if (!ret)
 			ret = cpu_up(cpu->sysdev.id);
+		if (!ret)
+			kobject_hotplug(&dev->kobj, KOBJ_ONLINE);
 		break;
 	default:
 		ret = -EINVAL;