net: forward_alloc_get depends on CONFIG_MPTCP

(struct proto)->sk_forward_alloc is currently only used by MPTCP.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/sock.h b/include/net/sock.h
index 2333ab08178903533cbc2dc1415a0de9545aa6db..cb97c448472aa5af3055916df844cbe422578190 100644 (file)
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1206,7 +1206,9 @@ struct proto {
        unsigned int            inuse_idx;
 #endif
 
+#if IS_ENABLED(CONFIG_MPTCP)
        int                     (*forward_alloc_get)(const struct sock *sk);
+#endif
 
        bool                    (*stream_memory_free)(const struct sock *sk, int wake);
        bool                    (*sock_is_readable)(struct sock *sk);
@@ -1295,10 +1297,11 @@ INDIRECT_CALLABLE_DECLARE(bool tcp_stream_memory_free(const struct sock *sk, int
 
 static inline int sk_forward_alloc_get(const struct sock *sk)
 {
-       if (!sk->sk_prot->forward_alloc_get)
-               return sk->sk_forward_alloc;
-
-       return sk->sk_prot->forward_alloc_get(sk);
+#if IS_ENABLED(CONFIG_MPTCP)
+       if (sk->sk_prot->forward_alloc_get)
+               return sk->sk_prot->forward_alloc_get(sk);
+#endif
+       return sk->sk_forward_alloc;
 }
 
 static inline bool __sk_stream_memory_free(const struct sock *sk, int wake)