diff --git a/include/linux/sched.h b/include/linux/sched.h
index 03b68a7..2bbf968 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -909,6 +909,7 @@
 #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