1 files changed, 9 insertions, 1 deletions

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 14d32588cccd..e615dfbcf794 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -280,12 +280,13 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
                                 __func__, cpu);
                 goto out_release;
         }
+        smpboot_park_threads(cpu);
 
         err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu));
         if (err) {
                 /* CPU didn't die: tell everyone.  Can't complain. */
+                smpboot_unpark_threads(cpu);
                 cpu_notify_nofail(CPU_DOWN_FAILED | mod, hcpu);
-
                 goto out_release;
         }
         BUG_ON(cpu_online(cpu));
@@ -354,6 +355,10 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
                 goto out;
         }
 
+        ret = smpboot_create_threads(cpu);
+        if (ret)
+                goto out;
+
         ret = __cpu_notify(CPU_UP_PREPARE | mod, hcpu, -1, &nr_calls);
         if (ret) {
                 nr_calls--;
@@ -368,6 +373,9 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
                 goto out_notify;
         BUG_ON(!cpu_online(cpu));
 
+        /* Wake the per cpu threads */
+        smpboot_unpark_threads(cpu);
+
         /* Now call notifier in preparation. */
         cpu_notify(CPU_ONLINE | mod, hcpu);