Hi Robin, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 5472f14a37421d1bca3dddf33cabd3bd6dbefbbc commit: b4ceb4a5359ed1c9ba4a20acf3a70d4bbead3248 iommu: Tidy up Kconfig for SoC IOMMUs date: 1 year, 5 months ago config: x86_64-buildonly-randconfig-r004-20211215 (https://download.01.org/0day-ci/archive/20211215/202112151637.BKx0hSTS-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b6a2ddb6c8ac29412b1361810972e15221fa021c) 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 # 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 b4ceb4a5359ed1c9ba4a20acf3a70d4bbead3248 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/drm/rockchip/ kernel/sched/ 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 cdn_dp_dt_ids[] = { ^ 1 warning generated. vim +/cdn_dp_dt_ids +54 drivers/gpu/drm/rockchip/cdn-dp-core.c 1a0f7ed3abe29c Chris Zhong 2017-02-05 53 1a0f7ed3abe29c Chris Zhong 2017-02-05 @54 static const struct of_device_id cdn_dp_dt_ids[] = { 1a0f7ed3abe29c Chris Zhong 2017-02-05 55 { .compatible = "rockchip,rk3399-cdn-dp", 1a0f7ed3abe29c Chris Zhong 2017-02-05 56 .data = (void *)&rk3399_cdn_dp }, 1a0f7ed3abe29c Chris Zhong 2017-02-05 57 {} 1a0f7ed3abe29c Chris Zhong 2017-02-05 58 }; 1a0f7ed3abe29c Chris Zhong 2017-02-05 59 :::::: The code at line 54 was first introduced by commit :::::: 1a0f7ed3abe29cff8e652c69a8ad89aec2c40f00 drm/rockchip: cdn-dp: add cdn DP support for rk3399 :::::: TO: Chris Zhong <zyw(a)rock-chips.com&gt; :::::: CC: Mark Yao <mark.yao(a)rock-chips.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org