proc-v7-bugs.c:undefined reference to `spectre_v2_update_state'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dda64ead7e82caa47fafe0edc36067ee64df2203
commit: 9dd78194a3722fa6712192cdd4f7032d45112a9a ARM: report Spectre v2 status through sysfs
date:   6 days ago
config: arm-randconfig-r022-20220310 (https://download.01.org/0day-ci/archive/20220311/202203111231.E0EK6F0R-lkp@xxxxxxxxx/config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9dd78194a3722fa6712192cdd4f7032d45112a9a
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 9dd78194a3722fa6712192cdd4f7032d45112a9a
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: arch/arm/mm/proc-v7-bugs.o: in function `cpu_v7_bugs_init':
>> proc-v7-bugs.c:(.text+0x4e): undefined reference to `spectre_v2_update_state'

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