[PATCH] [net-next] ip_tunnel: fix building with NET_IP_TUNNEL=m

[Arnd Bergmann]

When af_mpls is built-in but the tunnel support is a module,
we get a link failure:

net/mpls/af_mpls.o: In function `mpls_init':
af_mpls.c:(.init.text+0xdc): undefined reference to `ip_tunnel_encap_add_ops'

This adds a Kconfig statement to prevent the broken
configuration and force mpls to be a module as well in
this case.

Fixes: bdc476413dcd ("ip_tunnel: add mpls over gre support")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 net/mpls/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mpls/Kconfig b/net/mpls/Kconfig
index 5c467ef97311..801ea9098387 100644
--- a/net/mpls/Kconfig
+++ b/net/mpls/Kconfig
@@ -24,6 +24,7 @@ config NET_MPLS_GSO
 
 config MPLS_ROUTING
 	tristate "MPLS: routing support"
+	depends on NET_IP_TUNNEL || NET_IP_TUNNEL=n
 	---help---
 	 Add support for forwarding of mpls packets.
 
-- 
2.9.0