[mptcp:export 10/19] xtensa-linux-ld: net/mptcp/ctrl.o:undefined reference to `sysctl_vals'

[mptcp:export 10/19] xtensa-linux-ld: net/mptcp/ctrl.o:undefined reference to `sysctl_vals'

[kernel test robot]

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tree:   https://github.com/multipath-tcp/mptcp_net-next.git export
head:   110b44d969c1b6535d06bbb9be33eaa5adbd8136
commit: 184add5b09ce5b072350fb5eddaf795e3fb708ce [10/19] mptcp: restrict values of 'enabled' sysctl
config: xtensa-randconfig-r021-20210428 (attached as .config)
compiler: xtensa-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
        # https://github.com/multipath-tcp/mptcp_net-next/commit/184add5b09ce5b072350fb5eddaf795e3fb708ce
        git remote add mptcp https://github.com/multipath-tcp/mptcp_net-next.git
        git fetch --no-tags mptcp export
        git checkout 184add5b09ce5b072350fb5eddaf795e3fb708ce
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=xtensa 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> xtensa-linux-ld: net/mptcp/ctrl.o:(.data+0x3c): undefined reference to `sysctl_vals'
   xtensa-linux-ld: net/mptcp/ctrl.o:(.data+0x40): undefined reference to `sysctl_vals'

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

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