Merge branch 'socket-space-optimizations'

Eric Dumazet says:

====================
net: avoid some atomic ops when FASYNC is not used

We can avoid some atomic operations on sockets not using FASYNC
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/sock.h

@@ -1940,11 +1940,19 @@ static inline unsigned long sock_wspace(struct sock *sk)
  */
 static inline void sk_set_bit(int nr, struct sock *sk)
 {
+	if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) &&
+	    !sock_flag(sk, SOCK_FASYNC))
+		return;
+
 	set_bit(nr, &sk->sk_wq_raw->flags);
 }
 
 static inline void sk_clear_bit(int nr, struct sock *sk)
 {
+	if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) &&
+	    !sock_flag(sk, SOCK_FASYNC))
+		return;
+
 	clear_bit(nr, &sk->sk_wq_raw->flags);
 }