tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git staging-testing head: 5b4f167ef3555ec4c334a8dc89c1b44bb2c6bff5 commit: 9a5ad3a2a4e6f948efbc5f4ddde8190dc25d2058 [388/409] staging: rtl8188eu: remove all DBG_88E calls from hal/rtl8188e_cmd.c config: mips-allyesconfig (attached as .config) compiler: mips-linux-gcc (GCC) 9.3.0 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/gregkh/staging.git/commit... git remote add staging https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git git fetch --no-tags staging staging-testing git checkout 9a5ad3a2a4e6f948efbc5f4ddde8190dc25d2058 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/staging/rtl8188eu/hal/rtl8188e_cmd.c: In function 'rtl8188e_set_FwMediaStatus_cmd': 180 | u8 opmode, macid; | ^~~~~ 180 | u8 opmode, macid; | ^~~~~~ vim +/macid +180 drivers/staging/rtl8188eu/hal/rtl8188e_cmd.c 7ef8ded0cfdb69 Larry Finger 2013-08-21 177 7ef8ded0cfdb69 Larry Finger 2013-08-21 178 void rtl8188e_set_FwMediaStatus_cmd(struct adapter *adapt, __le16 mstatus_rpt) 7ef8ded0cfdb69 Larry Finger 2013-08-21 179 { 7ef8ded0cfdb69 Larry Finger 2013-08-21 @180 u8 opmode, macid; 7ef8ded0cfdb69 Larry Finger 2013-08-21 181 u16 mst_rpt = le16_to_cpu(mstatus_rpt); fc988e144cca2a Yamanappagouda Patil 2017-02-21 182 7ef8ded0cfdb69 Larry Finger 2013-08-21 183 opmode = (u8)mst_rpt; 7ef8ded0cfdb69 Larry Finger 2013-08-21 184 macid = (u8)(mst_rpt >> 8); 7ef8ded0cfdb69 Larry Finger 2013-08-21 185 7ef8ded0cfdb69 Larry Finger 2013-08-21 186 FillH2CCmd_88E(adapt, H2C_COM_MEDIA_STATUS_RPT, sizeof(mst_rpt), (u8 *)&mst_rpt); 7ef8ded0cfdb69 Larry Finger 2013-08-21 187 } 7ef8ded0cfdb69 Larry Finger 2013-08-21 188 :::::: The code at line 180 was first introduced by commit :::::: 7ef8ded0cfdb690e37581af85eea35fa67cdb38d staging: r8188eu: Add files for new driver - part 13 :::::: TO: Larry Finger <Larry.Finger(a)lwfinger.net&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org