tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 1140ab592e2ebf8153d2b322604031a8868ce7a5 commit: e61ffb344591fca443be4fc633290cbf15ee3298 power: supply: Add AC driver for Surface Aggregator Module date: 5 weeks ago config: i386-randconfig-s032-20210511 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout e61ffb344591fca443be4fc633290cbf15ee3298 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' 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; sparse warnings: (new ones prefixed by >>) drivers/power/supply/surface_charger.c:31:1: sparse: sparse: symbol '__raw_ssam_bat_get_sta' was not declared. Should it be static? drivers/power/supply/surface_charger.c:31:1: sparse: sparse: symbol 'ssam_bat_get_sta' was not declared. Should it be static? drivers/power/supply/surface_charger.c:37:1: sparse: sparse: symbol '__raw_ssam_bat_get_psrc' was not declared. Should it be static? drivers/power/supply/surface_charger.c:37:1: sparse: sparse: symbol 'ssam_bat_get_psrc' was not declared. Should it be static? drivers/power/supply/surface_charger.c:69:21: sparse: expected unsigned int [usertype] old drivers/power/supply/surface_charger.c:69:21: sparse: got restricted __le32 [usertype] state drivers/power/supply/surface_charger.c:229:1: sparse: sparse: symbol 'surface_ac_pm_ops' was not declared. Should it be static? vim +69 drivers/power/supply/surface_charger.c 66 67 static int spwr_ac_update_unlocked(struct spwr_ac_device *ac) 68 { 70 int status; 71 72 lockdep_assert_held(&ac->lock); 73 74 status = ssam_retry(ssam_bat_get_psrc, ac->sdev, &ac->state); 75 if (status < 0) 76 return status; 77 79 } 80 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org