/* when using this file, alarm() is used */
-struct list_head timers;
+static struct list_head timers;
struct timer {
struct list_head list;
list_add(&timer->list, &timers);
}
-void timer_proc(int signo)
+static void timer_proc(int signo)
{
struct list_head *p;
list_for_each(p, &timers)