epoll_wait() never return even though not specifying a timeout of -1

Issue

• The actual implementation of epoll_wait() system call does not conform to the manual page.
• According to the manual, epoll_wait() is expected to wait for a maximum time of "timeout" milliseconds. Since the "timeout" is type of (int), one can specify a value of between 1 and INT_MAX for it (both -1 and 0 have special meanings).

• But if one actually specify a timeout of between EP_MAX_MSTIMEO and INT_MAX, epoll_wait() never return (where EP_MAX_MSTIMEO is 2,147,482) because of the following implementation:

  [fs/eventpoll.c]
  1495 static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
  1496                    int maxevents, long timeout)
    :
  1508         jtimeout = (timeout<  0 || timeout>= EP_MAX_MSTIMEO) ?
  1509                 MAX_SCHEDULE_TIMEOUT : (timeout * HZ + 999) / 1000;
    :
  1539                         jtimeout = schedule_timeout(jtimeout);