tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 444565650a5fe9c63ddf153e6198e31705dedeb2 commit: a3434a497a2f33324e0f47bc1500a400959b4b25 ASoC: jz4740-i2s: Add support for the JZ4770 date: 8 weeks 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 a3434a497a2f33324e0f47bc1500a400959b4b25 # 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/jz4740/jz4740-i2s.c:463:34: warning: unused variable 'jz4740_i2s_soc_info' [-Wunused-const-variable] static const struct i2s_soc_info jz4740_i2s_soc_info = { ^ sound/soc/jz4740/jz4740-i2s.c:468:34: warning: unused variable 'jz4760_i2s_soc_info' [-Wunused-const-variable] static const struct i2s_soc_info jz4760_i2s_soc_info = { ^ static const struct i2s_soc_info jz4770_i2s_soc_info = { ^ sound/soc/jz4740/jz4740-i2s.c:496:34: warning: unused variable 'jz4780_i2s_soc_info' [-Wunused-const-variable] static const struct i2s_soc_info jz4780_i2s_soc_info = { ^ 4 warnings generated. vim +/jz4770_i2s_soc_info +491 sound/soc/jz4740/jz4740-i2s.c 490 492 .version = JZ_I2S_JZ4770, 493 .dai = &jz4770_i2s_dai, 494 }; 495 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org