[net-next:master 68/116] ip_tunnel.c:undefined reference to `sysctl_fb_tunnels_only_for_init_net'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
head:   3ab1270bfa1e8ae7db0d46fee90c5db2935ac91b
commit: 316cdaa1158af17250397054f92bb339fbd8e282 [68/116] net: add option to not create fall-back tunnels in root-ns as well
config: m68k-amcore_defconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 316cdaa1158af17250397054f92bb339fbd8e282
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All errors (new ones prefixed by >>):

   m68k-linux-ld: net/ipv4/ip_tunnel.o: in function `ip_tunnel_init_net':

quoted

ip_tunnel.c:(.text+0x1be2): undefined reference to `sysctl_fb_tunnels_only_for_init_net'

   m68k-linux-ld: net/ipv6/sit.o: in function `sit_init_net':

quoted

sit.c:(.init.text+0x104): undefined reference to `sysctl_fb_tunnels_only_for_init_net'
m68k-linux-ld: sit.c:(.init.text+0x10c): undefined reference to `sysctl_fb_tunnels_only_for_init_net'

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org