Hi Jean, I love your patch! Perhaps something to improve: [auto build test WARNING on linus/master] [cannot apply to v5.4-rc3 next-20191011] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Jean-Delvare/Instantiate-SPD-EEP... config: sparc64-allmodconfig (attached as .config) compiler: sparc64-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=sparc64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from drivers/i2c/i2c-core-base.c:24:0: include/linux/i2c-smbus.h: In function 'i2c_register_spd': >> include/linux/i2c-smbus.h:52:9: warning: 'return' with a value, in function returning void return 0; ^ include/linux/i2c-smbus.h:50:13: note: declared here static void i2c_register_spd(struct i2c_adapter *adap) ^~~~~~~~~~~~~~~~ In file included from drivers/i2c/i2c-core-base.c:24:0: At top level: include/linux/i2c-smbus.h:50:13: warning: 'i2c_register_spd' defined but not used [-Wunused-function] vim +/return +52 include/linux/i2c-smbus.h 46 47 #if IS_ENABLED(CONFIG_I2C_SMBUS) && IS_ENABLED(CONFIG_DMI) 48 void i2c_register_spd(struct i2c_adapter *adap); 49 #else 50 static void i2c_register_spd(struct i2c_adapter *adap) 51 { > 52 return 0; 53 } 54 #endif 55