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 <davidel@xmailserver.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 7cc0eb7..99368bd 100644 (file)
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -927,14 +927,11 @@ errxit:
        /*
         * 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