tcp: Add a stub for sk_defer_free_flush()

When compiling the kernel with CONFIG_INET disabled, the
sk_defer_free_flush() should be defined as a nop.

This resolves the following compilation error:
  ld: net/core/sock.o: in function `sk_defer_free_flush':
  ./include/net/tcp.h:1378: undefined reference to `__sk_defer_free_flush'

Fixes: 79074a72d335 ("net: Flush deferred skb free on socket destroy")
Reported-by: kernel test robot <[email protected]>
Reviewed-by: Tariq Toukan <[email protected]>
Signed-off-by: Gal Pressman <[email protected]>
Reviewed-by: Eric Dumazet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 44e442bf23f9ccc0a1a914345c3faf1fc9f99d5f..b9fc978fb2cad600abee7ba9667f91769a390063 100644 (file)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1369,6 +1369,7 @@ static inline bool tcp_checksum_complete(struct sk_buff *skb)
 
 bool tcp_add_backlog(struct sock *sk, struct sk_buff *skb);
 
+#ifdef CONFIG_INET
 void __sk_defer_free_flush(struct sock *sk);
 
 static inline void sk_defer_free_flush(struct sock *sk)
@@ -1377,6 +1378,9 @@ static inline void sk_defer_free_flush(struct sock *sk)
                return;
        __sk_defer_free_flush(sk);
 }
+#else
+static inline void sk_defer_free_flush(struct sock *sk) {}
+#endif
 
 int tcp_filter(struct sock *sk, struct sk_buff *skb);
 void tcp_set_state(struct sock *sk, int state);