[patch] net, ipv4: fix link error when CONFIG_IPV6 is a module

[David Rientjes]

net/built-in.o: In function `ip_tunnel_xmit':
(.text+0x11ec70): undefined reference to `icmpv6_send'

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 net/ipv4/ip_tunnel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -600,7 +600,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
 			goto tx_error;
 		}
 	}
-#if IS_ENABLED(CONFIG_IPV6)
+#if IS_BUILTIN(CONFIG_IPV6)
 	else if (skb->protocol == htons(ETH_P_IPV6)) {
 		struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb);
 
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