static void oom_kill(void)
{
  struct task_struct *p, *q;

  read_lock(&tasklist_lock);
  p = select_bad_process();

  /* Found nothing?!?! Either we 
	  hang forever, or we panic. */
  if (p == NULL)
    panic("Out of memory and 
 	   no killable processes...\n");

  /* kill all processes that share 
	  the ->mm (i.e. all threads) */
  for_each_task(q) {
	  if (q->mm == p->mm)
		  oom_kill_task(q);
  }
  read_unlock(&tasklist_lock);

  /* Make kswapd go out of the way, so 
   * "p" has a good chance of killing 
   * itself before someone else gets the 
   * chance to ask for more memory. */
  yield();
  return;
}