tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 729e3d091984487f7aa1ebfabfe594e5b317ed0f commit: 4027860dcc4cd0c45c36bae21e45bee5a17f2f0f iio: Kconfig: at91_adc: add COMPILE_TEST dependency to driver date: 3 months ago config: x86_64-randconfig-a014-20200912 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 45d0343900d3005d1d00cbb1a87c419c085dec71) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 4027860dcc4cd0c45c36bae21e45bee5a17f2f0f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): static const struct of_device_id at91_adc_dt_ids[] = { ^ 1 warning generated. # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 4027860dcc4cd0c45c36bae21e45bee5a17f2f0f vim +/at91_adc_dt_ids +1439 drivers/iio/adc/at91_adc.c e1811f97ba985f Josh Wu 2013-08-27 1438 e364185f3ed2ec Maxime Ripard 2012-05-11 @1439 static const struct of_device_id at91_adc_dt_ids[] = { e1811f97ba985f Josh Wu 2013-08-27 1440 { .compatible = "atmel,at91sam9260-adc", .data = &at91sam9260_caps }, 65b1fdbac9e39d Alexandre Belloni 2014-04-15 1441 { .compatible = "atmel,at91sam9rl-adc", .data = &at91sam9rl_caps }, e1811f97ba985f Josh Wu 2013-08-27 1442 { .compatible = "atmel,at91sam9g45-adc", .data = &at91sam9g45_caps }, e1811f97ba985f Josh Wu 2013-08-27 1443 { .compatible = "atmel,at91sam9x5-adc", .data = &at91sam9x5_caps }, e364185f3ed2ec Maxime Ripard 2012-05-11 1444 {}, e364185f3ed2ec Maxime Ripard 2012-05-11 1445 }; e364185f3ed2ec Maxime Ripard 2012-05-11 1446 MODULE_DEVICE_TABLE(of, at91_adc_dt_ids); 467a44b0372d82 Alexandre Belloni 2014-05-03 1447 :::::: The code at line 1439 was first introduced by commit :::::: e364185f3ed2ecc0a4dbfe2507f20fd5db76c966 IIO: AT91: Add DT support to at91_adc driver :::::: TO: Maxime Ripard <maxime.ripard(a)free-electrons.com&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org