tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git staging-next head: 0bd35146642bdc56f1b87d75f047b1c92bd2bd39 commit: 987219ad34a67b6160e6f5247578596a1a887031 [319/341] staging: r8188eu: remove lines from Makefile that silence build warnings config: x86_64-randconfig-r005-20210815 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 7776b19eed44906e9973bfb240b6279d6feaab41) 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-next git checkout 987219ad34a67b6160e6f5247578596a1a887031 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): In file included from drivers/staging/r8188eu/hal/rtl8188e_cmd.c:7: In file included from drivers/staging/r8188eu/hal/../include/drv_types.h:22: drivers/staging/r8188eu/hal/../include/rtw_recv.h:395:9: warning: variable 'buf_desc' is uninitialized when used here [-Wuninitialized] return buf_desc; ^~~~~~~~ drivers/staging/r8188eu/hal/../include/rtw_recv.h:391:25: note: initialize the variable 'buf_desc' to silence this warning unsigned char *buf_desc; ^ = NULL drivers/staging/r8188eu/hal/../include/rtw_recv.h:412:52: warning: variable 'buf_star' is uninitialized when used here [-Wuninitialized] precv_frame = rxmem_to_recvframe((unsigned char *)buf_star); ^~~~~~~~ drivers/staging/r8188eu/hal/../include/rtw_recv.h:410:14: note: initialize the variable 'buf_star' to silence this warning u8 *buf_star; ^ = NULL u8 macid, init_rate, raid, shortGIrate = false; ^ 3 warnings generated. vim +/init_rate +158 drivers/staging/r8188eu/hal/rtl8188e_cmd.c 8cd574e6af5463 Phillip Potter 2021-07-28 149 8cd574e6af5463 Phillip Potter 2021-07-28 150 /* bitmap[0:27] = tx_rate_bitmap */ 8cd574e6af5463 Phillip Potter 2021-07-28 151 /* bitmap[28:31]= Rate Adaptive id */ 8cd574e6af5463 Phillip Potter 2021-07-28 152 /* arg[0:4] = macid */ 8cd574e6af5463 Phillip Potter 2021-07-28 153 /* arg[5] = Short GI */ 8cd574e6af5463 Phillip Potter 2021-07-28 154 void rtl8188e_Add_RateATid(struct adapter *pAdapter, u32 bitmap, u8 arg, u8 rssi_level) 8cd574e6af5463 Phillip Potter 2021-07-28 155 { 8cd574e6af5463 Phillip Potter 2021-07-28 156 struct hal_data_8188e *haldata = GET_HAL_DATA(pAdapter); 8cd574e6af5463 Phillip Potter 2021-07-28 157 8cd574e6af5463 Phillip Potter 2021-07-28 @158 u8 macid, init_rate, raid, shortGIrate = false; 8cd574e6af5463 Phillip Potter 2021-07-28 159 8cd574e6af5463 Phillip Potter 2021-07-28 160 macid = arg&0x1f; 8cd574e6af5463 Phillip Potter 2021-07-28 161 8cd574e6af5463 Phillip Potter 2021-07-28 162 raid = (bitmap>>28) & 0x0f; 8cd574e6af5463 Phillip Potter 2021-07-28 163 bitmap &= 0x0fffffff; 8cd574e6af5463 Phillip Potter 2021-07-28 164 8cd574e6af5463 Phillip Potter 2021-07-28 165 if (rssi_level != DM_RATR_STA_INIT) 8cd574e6af5463 Phillip Potter 2021-07-28 166 bitmap = ODM_Get_Rate_Bitmap(&haldata->odmpriv, macid, bitmap, rssi_level); 8cd574e6af5463 Phillip Potter 2021-07-28 167 8cd574e6af5463 Phillip Potter 2021-07-28 168 bitmap |= ((raid<<28)&0xf0000000); 8cd574e6af5463 Phillip Potter 2021-07-28 169 8cd574e6af5463 Phillip Potter 2021-07-28 170 init_rate = get_highest_rate_idx(bitmap&0x0fffffff)&0x3f; 8cd574e6af5463 Phillip Potter 2021-07-28 171 8cd574e6af5463 Phillip Potter 2021-07-28 172 shortGIrate = (arg&BIT(5)) ? true : false; 8cd574e6af5463 Phillip Potter 2021-07-28 173 8cd574e6af5463 Phillip Potter 2021-07-28 174 if (shortGIrate) 8cd574e6af5463 Phillip Potter 2021-07-28 175 init_rate |= BIT(6); 8cd574e6af5463 Phillip Potter 2021-07-28 176 8cd574e6af5463 Phillip Potter 2021-07-28 177 raid = (bitmap>>28) & 0x0f; 8cd574e6af5463 Phillip Potter 2021-07-28 178 8cd574e6af5463 Phillip Potter 2021-07-28 179 bitmap &= 0x0fffffff; 8cd574e6af5463 Phillip Potter 2021-07-28 180 8cd574e6af5463 Phillip Potter 2021-07-28 181 DBG_88E("%s=> mac_id:%d, raid:%d, ra_bitmap=0x%x, shortGIrate=0x%02x\n", 8cd574e6af5463 Phillip Potter 2021-07-28 182 __func__, macid, raid, bitmap, shortGIrate); 8cd574e6af5463 Phillip Potter 2021-07-28 183 6839ff57baa4a6 Michael Straube 2021-08-09 184 ODM_RA_UpdateRateInfo_8188E(&haldata->odmpriv, macid, raid, bitmap, shortGIrate); 8cd574e6af5463 Phillip Potter 2021-07-28 185 } 8cd574e6af5463 Phillip Potter 2021-07-28 186 :::::: The code at line 158 was first introduced by commit :::::: 8cd574e6af5463af7d693d111c61212e52c44810 staging: r8188eu: introduce new hal dir for RTL8188eu driver :::::: TO: Phillip Potter <phil(a)philpotter.co.uk&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