tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git 20211117-sysctl-cleanups-all-set-04
head:   3559bb8939dd93c96215ab179d868c5fdc167335
commit: 2acfd364b61533c1fd9e7a9ebf90d63e80435ce4 [21/36] fs: move binfmt_misc sysctl to its own file
config: um-i386_defconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/commit/?id=2acfd364b61533c1fd9e7a9ebf90d63e80435ce4
        git remote add mcgrof-next https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git
        git fetch --no-tags mcgrof-next 20211117-sysctl-cleanups-all-set-04
        git checkout 2acfd364b61533c1fd9e7a9ebf90d63e80435ce4
        # save the attached .config to linux build tree
        make W=1 ARCH=um SUBARCH=i386

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 >>, old ones prefixed by <<):

>> ERROR: modpost: "register_sysctl_mount_point" [fs/binfmt_misc.ko] undefined!

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