tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 4286d192c803571e8ca43b0f1f8ea04d663a278a commit: 689c7655b50c5de2b6f0f42fecfb37bde5acf040 ASoC: tlv320adcx140: Add the tlv320adcx140 codec driver family date: 3 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 689c7655b50c5de2b6f0f42fecfb37bde5acf040 # 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/tlv320adcx140.c:776:34: warning: unused variable 'tlv320adcx140_of_match' [-Wunused-const-variable] static const struct of_device_id tlv320adcx140_of_match[] = { ^ 1 warning generated. vim +/tlv320adcx140_of_match +776 sound/soc/codecs/tlv320adcx140.c 775 > 776 static const struct of_device_id tlv320adcx140_of_match[] = { 777 { .compatible = "ti,tlv320adc3140" }, 778 { .compatible = "ti,tlv320adc5140" }, 779 { .compatible = "ti,tlv320adc6140" }, 780 {}, 781 }; 782 MODULE_DEVICE_TABLE(of, tlv320adcx140_of_match); 783