tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git staging-testing head: 5b4f167ef3555ec4c334a8dc89c1b44bb2c6bff5 commit: 574e725d7330261f0d81afc613d5b890c466b76f [391/409] staging: rtl8188eu: remove all DBG_88E calls from hal/rtl8188e_xmit.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 574e725d7330261f0d81afc613d5b890c466b76f # 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_xmit.c: In function '_dbg_dump_tx_info': 31 | bool dump_txdesc = false; | ^~~~~~~~~~~ vim +/dump_txdesc +31 drivers/staging/rtl8188eu/hal/rtl8188e_xmit.c fc324b6a9303b2 Larry Finger 2013-08-21 26 fc324b6a9303b2 Larry Finger 2013-08-21 27 void _dbg_dump_tx_info(struct adapter *padapter, int frame_tag, fc324b6a9303b2 Larry Finger 2013-08-21 28 struct tx_desc *ptxdesc) fc324b6a9303b2 Larry Finger 2013-08-21 29 { fc324b6a9303b2 Larry Finger 2013-08-21 30 u8 dmp_txpkt; fc324b6a9303b2 Larry Finger 2013-08-21 @31 bool dump_txdesc = false; :::::: The code at line 31 was first introduced by commit :::::: fc324b6a9303b290915d92977ec5aa3751b950ed staging: r8188eu: Add files for new driver - part 15 :::::: 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