tcp: Fold do_tcp_sendpages() into tcp_sendpage_locked()

Fold do_tcp_sendpages() into its last remaining caller,
tcp_sendpage_locked().
Signed-off-by: David Howells <dhowells@redhat.com>
cc: David Ahern <dsahern@kernel.org>
cc: Jens Axboe <axboe@kernel.dk>
cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/tcp.h

@@ -333,8 +333,6 @@ int tcp_sendpage(struct sock *sk, struct page *page, int offset, size_t size,
 		 int flags);
 int tcp_sendpage_locked(struct sock *sk, struct page *page, int offset,
 			size_t size, int flags);
-ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset,
-		 size_t size, int flags);
 int tcp_send_mss(struct sock *sk, int *size_goal, int flags);
 void tcp_push(struct sock *sk, int flags, int mss_now, int nonagle,
 	      int size_goal);

net/ipv4/tcp.c

@@ -974,12 +974,17 @@ static int tcp_wmem_schedule(struct sock *sk, int copy)
 	return min(copy, sk->sk_forward_alloc);
 }
 
-ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset,
-			 size_t size, int flags)
+int tcp_sendpage_locked(struct sock *sk, struct page *page, int offset,
+			size_t size, int flags)
 {
 	struct bio_vec bvec;
 	struct msghdr msg = { .msg_flags = flags | MSG_SPLICE_PAGES, };
 
+	if (!(sk->sk_route_caps & NETIF_F_SG))
+		return sock_no_sendpage_locked(sk, page, offset, size, flags);
+
+	tcp_rate_check_app_limited(sk);  /* is sending application-limited? */
+
 	bvec_set_page(&bvec, page, size, offset);
 	iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size);
 
@@ -988,18 +993,6 @@ ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset,
 
 	return tcp_sendmsg_locked(sk, &msg, size);
 }
-EXPORT_SYMBOL_GPL(do_tcp_sendpages);
-
-int tcp_sendpage_locked(struct sock *sk, struct page *page, int offset,
-			size_t size, int flags)
-{
-	if (!(sk->sk_route_caps & NETIF_F_SG))
-		return sock_no_sendpage_locked(sk, page, offset, size, flags);
-
-	tcp_rate_check_app_limited(sk);  /* is sending application-limited? */
-
-	return do_tcp_sendpages(sk, page, offset, size, flags);
-}
 EXPORT_SYMBOL_GPL(tcp_sendpage_locked);
 
 int tcp_sendpage(struct sock *sk, struct page *page, int offset,