2 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 1f7b2c097503..43c44530ef9d 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -42,6 +42,7 @@ struct notifier_block;
 /* Need to know about CPUs going up/down? */
 extern int register_cpu_notifier(struct notifier_block *nb);
 extern void unregister_cpu_notifier(struct notifier_block *nb);
+extern int current_in_cpu_hotplug(void);
 
 int cpu_up(unsigned int cpu);
 
@@ -54,6 +55,10 @@ static inline int register_cpu_notifier(struct notifier_block *nb)
 static inline void unregister_cpu_notifier(struct notifier_block *nb)
 {
 }
+static inline int current_in_cpu_hotplug(void)
+{
+        return 0;
+}
 
 #endif /* CONFIG_SMP */
 extern struct sysdev_class cpu_sysdev_class;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 03b68a7b4b82..2bbf968b23d9 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -909,6 +909,7 @@ do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
 #define PF_SYNCWRITE    0x00200000      /* I am doing a sync write */
 #define PF_BORROWED_MM  0x00400000      /* I am a kthread doing use_mm */
 #define PF_RANDOMIZE    0x00800000      /* randomize virtual address space */
+#define PF_HOTPLUG_CPU  0x01000000      /* Currently performing CPU hotplug */
 
 /*
  * Only the _current_ task can read/write to tsk->flags, but other