-int do_get_thread_area(struct thread_struct *t, struct user_desc *u_info);
-int do_set_thread_area(struct thread_struct *t, struct user_desc *u_info);
+int do_get_thread_area(struct thread_struct *t, struct user_desc __user *info);
+int do_set_thread_area(struct thread_struct *t, struct user_desc __user *info);