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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: 79134e6ce2 ("net: do not create fallback tunnels for non-default namespaces")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2018-03-13 12:44:53 +01:00 committed by David S. Miller
parent 6056415d3a
commit be9fc0971a
1 changed files with 3 additions and 1 deletions
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4
include/linux/netdevice.h
View File

@ -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 ||
!IS_ENABLED(CONFIG_SYSCTL) ||
!sysctl_fb_tunnels_only_for_init_net;
}
static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)