tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 4286d192c803571e8ca43b0f1f8ea04d663a278a commit: 2159a6810e96c38a469c39df8e109edb7232d3c9 ASoC: codecs: Add jz4770-codec driver date: 4 months ago config: mips-randconfig-r014-20200522 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3393cc4cebf9969db94dc424b7a2b6195589c33b) 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-mips-linux-gnu git checkout 2159a6810e96c38a469c39df8e109edb7232d3c9 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): sound/soc/codecs/jz4770.c:306:35: warning: unused variable 'mic_boost_tlv' [-Wunused-const-variable] static const DECLARE_TLV_DB_SCALE(mic_boost_tlv, 0, 400, 0); ^ include/sound/tlv.h:22:31: note: expanded from macro 'DECLARE_TLV_DB_SCALE' #define DECLARE_TLV_DB_SCALE SNDRV_CTL_TLVD_DECLARE_DB_SCALE ^ static const struct of_device_id jz4770_codec_of_matches[] = { ^ 2 warnings generated. vim +/jz4770_codec_of_matches +930 sound/soc/codecs/jz4770.c 929 931 { .compatible = "ingenic,jz4770-codec", }, 932 { /* sentinel */ } 933 }; 934 MODULE_DEVICE_TABLE(of, jz4770_codec_of_matches); 935 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org