net: ignore sysctl_devconf_inherit_init_net without SYSCTL

When CONFIG_SYSCTL is turned off, we get a link failure for
the newly introduced tuning knob.

net/ipv6/addrconf.o: In function `addrconf_init_net':
addrconf.c:(.text+0x31dc): undefined reference to `sysctl_devconf_inherit_init_net'

Add an IS_ENABLED() check to fall back to the default behavior
(sysctl_devconf_inherit_init_net=0) here.

Fixes: 856c395cfa63 ("net: introduce a knob to control whether to inherit devconf config")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Christian Brauner <christian@brauner.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index cd9033245b98..eb514f312e6f 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -2614,7 +2614,9 @@ static __net_init int devinet_init_net(struct net *net)
         tbl[0].extra2 = net;
 #endif
 
-        if (sysctl_devconf_inherit_init_net != 2 && !net_eq(net, &init_net)) {
+        if ((!IS_ENABLED(CONFIG_SYSCTL) ||
+             sysctl_devconf_inherit_init_net != 2) &&
+            !net_eq(net, &init_net)) {
                 memcpy(all, init_net.ipv4.devconf_all, sizeof(ipv4_devconf));
                 memcpy(dflt, init_net.ipv4.devconf_dflt, sizeof(ipv4_devconf_dflt));
         }