diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index 1689e28..fcd61fa 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -39,6 +39,7 @@
 
 extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
 extern void free_pid_ns(struct kref *kref);
+extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
 
 static inline void put_pid_ns(struct pid_namespace *ns)
 {
@@ -66,6 +67,11 @@
 {
 }
 
+
+static inline void zap_pid_ns_processes(struct pid_namespace *ns)
+{
+	BUG();
+}
 #endif /* CONFIG_PID_NS */
 
 static inline struct pid_namespace *task_active_pid_ns(struct task_struct *tsk)