epoll keyed wakeups: make sockets use keyed wakeups

Add support for event-aware wakeups to the sockets code.  Events are
delivered to the wakeup target, so that epoll can avoid spurious wakeups
for non-interesting events.

Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Miller <davem@davemloft.net>
Cc: William Lee Irwin III <wli@movementarian.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
index 0620046e4eba..7dbf3ffb35cc 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1677,7 +1677,7 @@ static void sock_def_error_report(struct sock *sk)
 {
         read_lock(&sk->sk_callback_lock);
         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
-                wake_up_interruptible(sk->sk_sleep);
+                wake_up_interruptible_poll(sk->sk_sleep, POLLERR);
         sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
         read_unlock(&sk->sk_callback_lock);
 }
@@ -1686,7 +1686,8 @@ static void sock_def_readable(struct sock *sk, int len)
 {
         read_lock(&sk->sk_callback_lock);
         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
-                wake_up_interruptible_sync(sk->sk_sleep);
+                wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN |
+                                                POLLRDNORM | POLLRDBAND);
         sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
         read_unlock(&sk->sk_callback_lock);
 }
@@ -1700,7 +1701,8 @@ static void sock_def_write_space(struct sock *sk)
          */
         if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
                 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
-                        wake_up_interruptible_sync(sk->sk_sleep);
+                        wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT |
+                                                POLLWRNORM | POLLWRBAND);
 
                 /* Should agree with poll, otherwise some programs break */
                 if (sock_writeable(sk))