Hi Chenyang, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on drm-misc/drm-misc-next] [also build test WARNING on linus/master v5.19-rc6 next-20220708] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Chenyang-Li/drm-loongson-Add-DRM-Driver-for-Loongson-7A1000-bridge-chip/20220625-171037 base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20220712/202207120454.PJBS1e9p-lkp@xxxxxxxxx/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 77a38f6839980bfac61babb40d83772c51427011) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/intel-lab-lkp/linux/commit/7cad653ee3a3b83188e2d91335269753e134b808 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Chenyang-Li/drm-loongson-Add-DRM-Driver-for-Loongson-7A1000-bridge-chip/20220625-171037 git checkout 7cad653ee3a3b83188e2d91335269753e134b808 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/gpu/drm/loongson/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/gpu/drm/loongson/loongson_irq.c:24:11: warning: variable 'lcrtc' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] else if (val & FB_VSYNC1_INT) ^~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/loongson/loongson_irq.c:27:26: note: uninitialized use occurs here drm_crtc_handle_vblank(&lcrtc->base); ^~~~~ drivers/gpu/drm/loongson/loongson_irq.c:24:7: note: remove the 'if' if its condition is always true else if (val & FB_VSYNC1_INT) ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/loongson/loongson_irq.c:16:29: note: initialize the variable 'lcrtc' to silence this warning struct loongson_crtc *lcrtc; ^ = NULL 1 warning generated. vim +24 drivers/gpu/drm/loongson/loongson_irq.c 11 12 static irqreturn_t loongson_irq_handler(int irq, void *arg) 13 { 14 struct drm_device *dev = (struct drm_device *) arg; 15 struct loongson_device *ldev = to_loongson_device(dev); 16 struct loongson_crtc *lcrtc; 17 u32 val; 18 19 val = ls7a_mm_rreg(ldev, FB_INT_REG); 20 ls7a_mm_wreg(ldev, FB_INT_REG, val & (0xffff << 16)); 21 22 if (val & FB_VSYNC0_INT) 23 lcrtc = ldev->mode_info[0].crtc; > 24 else if (val & FB_VSYNC1_INT) 25 lcrtc = ldev->mode_info[1].crtc; 26 27 drm_crtc_handle_vblank(&lcrtc->base); 28 29 return IRQ_HANDLED; 30 } 31 -- 0-DAY CI Kernel Test Service https://01.org/lkp _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
