1 files changed, 12 insertions, 1 deletions

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 2060c6e57027..0e6353cf147a 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -17,6 +17,8 @@
 #include <linux/gfp.h>
 #include <linux/suspend.h>
 
+#include "smpboot.h"
+
 #ifdef CONFIG_SMP
 /* Serializes the updates to cpu_online_mask, cpu_present_mask */
 static DEFINE_MUTEX(cpu_add_remove_lock);
@@ -295,11 +297,19 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
         int ret, nr_calls = 0;
         void *hcpu = (void *)(long)cpu;
         unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0;
+        struct task_struct *idle;
 
         if (cpu_online(cpu) || !cpu_present(cpu))
                 return -EINVAL;
 
         cpu_hotplug_begin();
+
+        idle = idle_thread_get(cpu);
+        if (IS_ERR(idle)) {
+                ret = PTR_ERR(idle);
+                goto out;
+        }
+
         ret = __cpu_notify(CPU_UP_PREPARE | mod, hcpu, -1, &nr_calls);
         if (ret) {
                 nr_calls--;
@@ -309,7 +319,7 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
         }
 
         /* Arch-specific enabling code. */
-        ret = __cpu_up(cpu);
+        ret = __cpu_up(cpu, idle);
         if (ret != 0)
                 goto out_notify;
         BUG_ON(!cpu_online(cpu));
@@ -320,6 +330,7 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
 out_notify:
         if (ret != 0)
                 __cpu_notify(CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL);
+out:
         cpu_hotplug_done();
 
         return ret;