1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 6ef3069b5710..b79badd0f158 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -16,6 +16,11 @@ struct sysdev_class cpu_sysdev_class = {
 EXPORT_SYMBOL(cpu_sysdev_class);
 
 #ifdef CONFIG_HOTPLUG_CPU
+int __attribute__((weak)) smp_prepare_cpu (int cpu)
+{
+        return 0;
+}
+
 static ssize_t show_online(struct sys_device *dev, char *buf)
 {
         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
@@ -36,7 +41,11 @@ static ssize_t store_online(struct sys_device *dev, const char *buf,
                         kobject_hotplug(&dev->kobj, KOBJ_OFFLINE);
                 break;
         case '1':
-                ret = cpu_up(cpu->sysdev.id);
+                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;