netdev - [PATCH net-next] bpf: tcp: Fix unused-function warnings

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Date:   Mon, 30 Mar 2020 00:49:09 -0700
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Saeed Mahameed <saeedm@...lanox.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>
Subject: [PATCH net-next] bpf: tcp: Fix unused-function warnings

tcp_bpf_sendpage, tcp_bpf_sendmsg, tcp_bpf_send_verdict and
tcp_bpf_stream_read are only used when CONFIG_BPF_STREAM_PARSER is ON,
make sure they are defined under this flag as well.

Fixed compiler warnings:

net/ipv4/tcp_bpf.c:483:12:
warning: ‘tcp_bpf_sendpage’ defined but not used [-Wunused-function]
 static int tcp_bpf_sendpage(struct sock *sk, struct page *page, ...
            ^~~~~~~~~~~~~~~~
net/ipv4/tcp_bpf.c:395:12:
warning: ‘tcp_bpf_sendmsg’ defined but not used [-Wunused-function]
 static int tcp_bpf_sendmsg(struct sock *sk, struct msghdr, ...
            ^~~~~~~~~~~~~~~
net/ipv4/tcp_bpf.c:13:13:
warning: ‘tcp_bpf_stream_read’ defined but not used [-Wunused-function]
 static bool tcp_bpf_stream_read(const struct sock *sk)

Fixes: 604326b41a6f ("bpf, sockmap: convert to generic sk_msg interface")
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: John Fastabend <john.fastabend@...il.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 net/ipv4/tcp_bpf.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c
index fe7b4fbc31c1..2a7efc5dab96 100644
--- a/net/ipv4/tcp_bpf.c
+++ b/net/ipv4/tcp_bpf.c
@@ -10,19 +10,6 @@
 #include <net/inet_common.h>
 #include <net/tls.h>
 
-static bool tcp_bpf_stream_read(const struct sock *sk)
-{
-	struct sk_psock *psock;
-	bool empty = true;
-
-	rcu_read_lock();
-	psock = sk_psock(sk);
-	if (likely(psock))
-		empty = list_empty(&psock->ingress_msg);
-	rcu_read_unlock();
-	return !empty;
-}
-
 static int tcp_bpf_wait_data(struct sock *sk, struct sk_psock *psock,
 			     int flags, long timeo, int *err)
 {
@@ -298,6 +285,21 @@ int tcp_bpf_sendmsg_redir(struct sock *sk, struct sk_msg *msg,
 }
 EXPORT_SYMBOL_GPL(tcp_bpf_sendmsg_redir);
 
+#ifdef CONFIG_BPF_STREAM_PARSER
+
+static bool tcp_bpf_stream_read(const struct sock *sk)
+{
+	struct sk_psock *psock;
+	bool empty = true;
+
+	rcu_read_lock();
+	psock = sk_psock(sk);
+	if (likely(psock))
+		empty = list_empty(&psock->ingress_msg);
+	rcu_read_unlock();
+	return !empty;
+}
+
 static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock,
 				struct sk_msg *msg, int *copied, int flags)
 {
@@ -528,7 +530,6 @@ static int tcp_bpf_sendpage(struct sock *sk, struct page *page, int offset,
 	return copied ? copied : err;
 }
 
-#ifdef CONFIG_BPF_STREAM_PARSER
 enum {
 	TCP_BPF_IPV4,
 	TCP_BPF_IPV6,
-- 
2.25.1