epoll: drop unnecessary test

Thomas found that there is an unnecessary (always true) test in
ep_send_events().  The callback never inserts into ->rdllink while the
send loop is performed, and also does the ~EP_PRIVATE_BITS test.  Given
we're holding the mutex during this time, the conditions tested inside the
loop are always true.  This patch drops the test done inside the
re-insertion loop.

Signed-off-by: Davide Libenzi <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: davidel

fs/eventpoll.c

@@ -927,14 +927,11 @@ static int ep_send_events(struct eventpoll *ep, struct epoll_event __user *event
 	/*
 	 * During the time we spent in the loop above, some other events
 	 * might have been queued by the poll callback. We re-insert them
-	 * here (in case they are not already queued, or they're one-shot).
+	 * inside the main ready-list here.
 	 */
 	for (nepi = ep->ovflist; (epi = nepi) != NULL;
-	     nepi = epi->next, epi->next = EP_UNACTIVE_PTR) {
-		if (!ep_is_linked(&epi->rdllink) &&
-		    (epi->event.events & ~EP_PRIVATE_BITS))
-			list_add_tail(&epi->rdllink, &ep->rdllist);
-	}
+	     nepi = epi->next, epi->next = EP_UNACTIVE_PTR)
+		list_add_tail(&epi->rdllink, &ep->rdllist);
 	/*
 	 * We need to set back ep->ovflist to EP_UNACTIVE_PTR, so that after
 	 * releasing the lock, events will be queued in the normal way inside