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Subject[PATCH net-next] net: fix sysctl_fb_tunnels_only_for_init_net link error
The new variable is only available when CONFIG_SYSCTL is enabled,
otherwise we get a link error:

net/ipv4/ip_tunnel.o: In function `ip_tunnel_init_net':
ip_tunnel.c:(.text+0x278b): undefined reference to `sysctl_fb_tunnels_only_for_init_net'
net/ipv6/sit.o: In function `sit_init_net':
sit.c:(.init.text+0x4c): undefined reference to `sysctl_fb_tunnels_only_for_init_net'
net/ipv6/ip6_tunnel.o: In function `ip6_tnl_init_net':
ip6_tunnel.c:(.init.text+0x39): undefined reference to `sysctl_fb_tunnels_only_for_init_net'

This adds an extra condition, keeping the traditional behavior when
CONFIG_SYSCTL is disabled.

Fixes: 79134e6ce2c9 ("net: do not create fallback tunnels for non-default namespaces")
Signed-off-by: Arnd Bergmann <>
include/linux/netdevice.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 5fbb9f1da7fd..913b1cc882cf 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -589,7 +589,9 @@ extern int sysctl_fb_tunnels_only_for_init_net;

static inline bool net_has_fallback_tunnels(const struct net *net)
- return net == &init_net || !sysctl_fb_tunnels_only_for_init_net;
+ return net == &init_net ||
+ !sysctl_fb_tunnels_only_for_init_net;

static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
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