Hi Sandor, FYI, the error/warning still remains. tree: https://github.com/Freescale/linux-fslc pr/391 head: 48afde5dc8ee425a1517ac38d6eca0fec76ad57e commit: 110d5c01d3f73ef56cd4ff4eba74a45b6f2dfc63 [12053/19640] MLK-24427-3: drm: mhdp: Backporting code change from linux-nxp config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 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://github.com/Freescale/linux-fslc/commit/110d5c01d3f73ef56cd4ff4eba... git remote add freescale-fslc https://github.com/Freescale/linux-fslc git fetch --no-tags freescale-fslc pr/391 git checkout 110d5c01d3f73ef56cd4ff4eba74a45b6f2dfc63 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/gpu/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from drivers/gpu/drm/rockchip/cdn-dp-core.c:24: 10 | #include <drm/bridge/cdns-mhdp-common.h> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ compilation terminated. vim +10 drivers/gpu/drm/rockchip/cdn-dp-core.h 1a0f7ed3abe29c Chris Zhong 2017-02-05 9 7a3d6a6e256cf5 Sandor Yu 2019-07-10 @10 #include <drm/bridge/cdns-mhdp-common.h> 7a3d6a6e256cf5 Sandor Yu 2019-07-10 11 #include <drm/drmP.h> 1a0f7ed3abe29c Chris Zhong 2017-02-05 12 #include <drm/drm_dp_helper.h> 1a0f7ed3abe29c Chris Zhong 2017-02-05 13 #include <drm/drm_panel.h> fcd70cd36b9bf6 Daniel Vetter 2019-01-17 14 #include <drm/drm_probe_helper.h> c2156ccd9657c9 Sam Ravnborg 2019-07-16 15 :::::: The code at line 10 was first introduced by commit :::::: 7a3d6a6e256cf5f35a9910c68432e3ba5b491116 drm: bridge: add Cadence MHDP HDMI/DP API :::::: TO: Sandor Yu <Sandor.yu(a)nxp.com&gt; :::::: CC: Dong Aisheng <aisheng.dong(a)nxp.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org