Hi Tomi, I love your patch! Perhaps something to improve: [auto build test WARNING on omap/for-next] [also build test WARNING on robh/for-next balbi-usb/testing/next linus/master v5.10-rc6] [cannot apply to next-20201201] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Tomi-Valkeinen/Convert-DSI-code-to-use-drm_mipi_dsi-and-drm_panel/20201124-205129 base: https://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap.git for-next config: riscv-randconfig-r016-20201202 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 2671fccf0381769276ca8246ec0499adcb9b0355) 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 # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/0day-ci/linux/commit/09d304dc23e60a46580ec8a3d7db7210138fc9db git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Tomi-Valkeinen/Convert-DSI-code-to-use-drm_mipi_dsi-and-drm_panel/20201124-205129 git checkout 09d304dc23e60a46580ec8a3d7db7210138fc9db # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/gpu/drm/panel/panel-dsi-cm.c:210:6: warning: variable 'r' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] if (ddata->enabled) ^~~~~~~~~~~~~~ drivers/gpu/drm/panel/panel-dsi-cm.c:216:9: note: uninitialized use occurs here return r; ^ drivers/gpu/drm/panel/panel-dsi-cm.c:210:2: note: remove the 'if' if its condition is always true if (ddata->enabled) ^~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/panel/panel-dsi-cm.c:197:7: note: initialize the variable 'r' to silence this warning int r; ^ = 0 1 warning generated. vim +210 drivers/gpu/drm/panel/panel-dsi-cm.c 193 194 static int dsicm_bl_update_status(struct backlight_device *dev) 195 { 196 struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev); 197 int r; 198 int level; 199 200 if (dev->props.fb_blank == FB_BLANK_UNBLANK && 201 dev->props.power == FB_BLANK_UNBLANK) 202 level = dev->props.brightness; 203 else 204 level = 0; 205 206 dev_dbg(&ddata->dsi->dev, "update brightness to %d\n", level); 207 208 mutex_lock(&ddata->lock); 209 > 210 if (ddata->enabled) 211 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_DISPLAY_BRIGHTNESS, 212 level); 213 214 mutex_unlock(&ddata->lock); 215 216 return r; 217 } 218 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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