Не могу собрать старый модуль ядра.

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/tty.h>

void tty_write_message1 (struct tty_struct *, char *);

static int my_init(void)
{
  char *msg="Hello tty!";

  printk("Hello, from kernel...\n");
  printk("parent pid =%d(%s)\n",current->parent->pid,current->parent->comm);
  printk("current pid =%d(%s)\n",current->pid,current->comm);

  tty_write_message1(current->signal->tty,msg);
  return 0;
}
static void my_cleanup (void)
{
  printk("Goodbye, from kernel...\n");
}
module_init(my_init);
module_exit(my_cleanup);

//Эта функция извлечена из <printk.c>
void tty_write_message1(struct tty_struct *tty, char *msg)
{
  if (tty & tty->driver->write)
    tty->driver->write(tty, msg, strlen(msg));
  return;
}