Hi Baolin, FYI, the error/warning still remains. tree: https://android.googlesource.com/kernel/common android11-kiwi-5.4 head: 04f660d6724f5df1b07f8cf9e1c55f70fb43d1d2 commit: 3ebeb5687243e405fbf34032249cada998ee4779 [4666/13186] FROMGIT: power: supply: Allow charger manager can be built as a module config: i386-randconfig-a005-20211004 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android11-kiwi-5.4 git checkout 3ebeb5687243e405fbf34032249cada998ee4779 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org