[PATCH net 1/4] ipv6: silence compilation warning for non-IPV6 builds

From: Leon Romanovsky <leonro@nvidia.com>

The W=1 compilation of allmodconfig generates the following warning:

net/ipv6/icmp.c:448:6: warning: no previous prototype for 'icmp6_send' [-Wmissing-prototypes]
  448 | void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
      |      ^~~~~~~~~~

In such configuration, the icmp6_send() is not used outside of icmp.c, so close
its EXPORT_SYMBOL and add "static" word to limit the scope.

Fixes: cc7a21b6fbd9 ("ipv6: icmp6: avoid indirect call for icmpv6_send()")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 net/ipv6/icmp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index f3d05866692e..5d4232b492dc 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c

@@ -445,6 +445,9 @@ static int icmp6_iif(const struct sk_buff *skb)
 /*
  *	Send an ICMP message in response to a packet in error
  */
+#if !IS_BUILTIN(CONFIG_IPV6)
+static
+#endif
 void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
 		const struct in6_addr *force_saddr)
 {

@@ -634,7 +637,10 @@ void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
 out_bh_enable:
 	local_bh_enable();
 }
+
+#if IS_BUILTIN(CONFIG_IPV6)
 EXPORT_SYMBOL(icmp6_send);
+#endif

 /* Slightly more convenient version of icmp6_send.
  */
--

2.29.2