Hi Samuel, FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: c1649ec55708ae42091a2f1bca1ab49ecd722d55 commit: 7d57f7f7975634a7a6c5b5adcfe70450426a830b drm/sun4i: Allow building the driver on RISC-V date: 9 months ago config: mips-randconfig-r022-20230118 compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 4196ca3278f78c6e19246e54ab0ecb364e37d66a) 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 mips cross compiling tool for clang build # apt-get install binutils-mipsel-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7d57f7f7975634a7a6c5b5adcfe70450426a830b git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 7d57f7f7975634a7a6c5b5adcfe70450426a830b # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/gpu/drm/bridge/synopsys/ kernel/trace/ lib/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c:30:18: warning: unused function 'hdmi_read' [-Wunused-function] static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset) ^ 1 warning generated. vim +/hdmi_read +30 drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c 2761ba6c0925ca drivers/gpu/drm/bridge/dw-hdmi-i2s-audio.c Kuninori Morimoto 2016-11-08 29 2761ba6c0925ca drivers/gpu/drm/bridge/dw-hdmi-i2s-audio.c Kuninori Morimoto 2016-11-08 @30 static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset) 2761ba6c0925ca drivers/gpu/drm/bridge/dw-hdmi-i2s-audio.c Kuninori Morimoto 2016-11-08 31 { 2761ba6c0925ca drivers/gpu/drm/bridge/dw-hdmi-i2s-audio.c Kuninori Morimoto 2016-11-08 32 struct dw_hdmi *hdmi = audio->hdmi; 2761ba6c0925ca drivers/gpu/drm/bridge/dw-hdmi-i2s-audio.c Kuninori Morimoto 2016-11-08 33 2761ba6c0925ca drivers/gpu/drm/bridge/dw-hdmi-i2s-audio.c Kuninori Morimoto 2016-11-08 34 return audio->read(hdmi, offset); 2761ba6c0925ca drivers/gpu/drm/bridge/dw-hdmi-i2s-audio.c Kuninori Morimoto 2016-11-08 35 } 2761ba6c0925ca drivers/gpu/drm/bridge/dw-hdmi-i2s-audio.c Kuninori Morimoto 2016-11-08 36 :::::: The code at line 30 was first introduced by commit :::::: 2761ba6c0925ca9c5b917a95f68135d9dce443fb drm: bridge: add DesignWare HDMI I2S audio support :::::: TO: Kuninori Morimoto :::::: CC: Archit Taneja -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests