Hi Phillip, I love your patch! Perhaps something to improve: [auto build test WARNING on staging/staging-testing] url: https://github.com/0day-ci/linux/commits/Phillip-Potter/staging-r8188eu-r... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git 093991aaadf0fbb34184fa37a46e7a157da3f386 config: sh-allmodconfig (attached as .config) compiler: sh4-linux-gcc (GCC) 11.2.0 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://github.com/0day-ci/linux/commit/195b942818ec8dcaa8f3ffd7e8c623d17... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Phillip-Potter/staging-r8188eu-remove-forward-declaration-of-Efuse_Read1ByteFromFakeContent/20210821-080835 git checkout 195b942818ec8dcaa8f3ffd7e8c623d172d75a50 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=sh 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 >>): 33 | Efuse_Read1ByteFromFakeContent( | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for SND_ATMEL_SOC_PDC Depends on SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC && HAS_DMA Selected by - SND_ATMEL_SOC_SSC && SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC - SND_ATMEL_SOC_SSC_PDC && SOUND && !UML && SND && SND_SOC && SND_ATMEL_SOC && ATMEL_SSC vim +/Efuse_Read1ByteFromFakeContent +33 drivers/staging/r8188eu/core/rtw_efuse.c 15865124feed88 Phillip Potter 2021-07-28 27 15865124feed88 Phillip Potter 2021-07-28 28 /* */ 15865124feed88 Phillip Potter 2021-07-28 29 #define REG_EFUSE_CTRL 0x0030 15865124feed88 Phillip Potter 2021-07-28 30 #define EFUSE_CTRL REG_EFUSE_CTRL /* E-Fuse Control. */ 15865124feed88 Phillip Potter 2021-07-28 31 /* */ 15865124feed88 Phillip Potter 2021-07-28 32 bool 15865124feed88 Phillip Potter 2021-07-28 @33 Efuse_Read1ByteFromFakeContent( 15865124feed88 Phillip Potter 2021-07-28 34 struct adapter *pAdapter, 15865124feed88 Phillip Potter 2021-07-28 35 u16 Offset, 15865124feed88 Phillip Potter 2021-07-28 36 u8 *Value) 15865124feed88 Phillip Potter 2021-07-28 37 { 15865124feed88 Phillip Potter 2021-07-28 38 if (Offset >= EFUSE_MAX_HW_SIZE) 15865124feed88 Phillip Potter 2021-07-28 39 return false; 15865124feed88 Phillip Potter 2021-07-28 40 if (fakeEfuseBank == 0) 15865124feed88 Phillip Potter 2021-07-28 41 *Value = fakeEfuseContent[Offset]; 15865124feed88 Phillip Potter 2021-07-28 42 else 15865124feed88 Phillip Potter 2021-07-28 43 *Value = fakeBTEfuseContent[fakeEfuseBank - 1][Offset]; 15865124feed88 Phillip Potter 2021-07-28 44 return true; 15865124feed88 Phillip Potter 2021-07-28 45 } 15865124feed88 Phillip Potter 2021-07-28 46 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org