Hi Masahiro,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   274d7803837da78dfc911bcda0d593412676fc20
commit: 4f62512adbe9a2fed6c99011a5a3ece929b2f633 [10827/11993] kbuild: use obj-y instead extra-y for objects placed at the head
config: s390-randconfig-r011-20221002
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
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
        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=4f62512adbe9a2fed6c99011a5a3ece929b2f633
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 4f62512adbe9a2fed6c99011a5a3ece929b2f633
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash

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

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "__sanitizer_cov_trace_pc" [arch/s390/mm/cmm.ko] undefined!
>> ERROR: modpost: "del_timer_sync" [arch/s390/mm/cmm.ko] undefined!
>> ERROR: modpost: "unregister_oom_notifier" [arch/s390/mm/cmm.ko] undefined!
>> ERROR: modpost: "kthread_stop" [arch/s390/mm/cmm.ko] undefined!
>> ERROR: modpost: "del_timer" [arch/s390/mm/cmm.ko] undefined!
>> ERROR: modpost: "_raw_spin_lock" [arch/s390/mm/cmm.ko] undefined!
>> ERROR: modpost: "free_pages" [arch/s390/mm/cmm.ko] undefined!
>> ERROR: modpost: "__ubsan_handle_out_of_bounds" [arch/s390/mm/cmm.ko] undefined!
>> ERROR: modpost: "_raw_spin_unlock" [arch/s390/mm/cmm.ko] undefined!
>> ERROR: modpost: "__wake_up" [arch/s390/mm/cmm.ko] undefined!
WARNING: modpost: suppressed 16881 unresolved symbol warnings because there were too many)

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp