Hi Stephan, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: d992fe5318d8d7af9510b879439a3c7f283da442 commit: a871be6b8eee13a35a3e8e56c62770ef17ee9220 cpuidle: Convert Qualcomm SPM driver to a generic CPUidle driver date: 1 year, 3 months ago config: arm-randconfig-r021-20210820 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0 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://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 a871be6b8eee13a35a3e8e56c62770ef17ee9220 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash 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 >>): arm-linux-gnueabi-ld: drivers/gpu/drm/rcar-du/rcar_du_crtc.o: in function `rcar_du_crtc_atomic_begin': rcar_du_crtc.c:(.text+0x1ac0): undefined reference to `rcar_cmm_setup' arm-linux-gnueabi-ld: drivers/gpu/drm/rcar-du/rcar_du_crtc.o: in function `rcar_du_crtc_atomic_enable': rcar_du_crtc.c:(.text+0x1b1c): undefined reference to `rcar_cmm_enable' arm-linux-gnueabi-ld: rcar_du_crtc.c:(.text+0x1c04): undefined reference to `rcar_cmm_setup' arm-linux-gnueabi-ld: rcar_du_crtc.c:(.text+0x1c70): undefined reference to `rcar_lvds_clk_enable' arm-linux-gnueabi-ld: drivers/gpu/drm/rcar-du/rcar_du_crtc.o: in function `rcar_du_crtc_atomic_disable': rcar_du_crtc.c:(.text+0x1fe4): undefined reference to `rcar_cmm_disable' arm-linux-gnueabi-ld: rcar_du_crtc.c:(.text+0x22b4): undefined reference to `rcar_lvds_clk_disable' arm-linux-gnueabi-ld: drivers/gpu/drm/rcar-du/rcar_du_drv.o: in function `rcar_du_init': rcar_du_drv.c:(.init.text+0x14): undefined reference to `rcar_du_of_init' arm-linux-gnueabi-ld: drivers/gpu/drm/rcar-du/rcar_du_encoder.o: in function `rcar_du_encoder_init': rcar_du_encoder.c:(.text+0x2cc): undefined reference to `rcar_lvds_dual_link' arm-linux-gnueabi-ld: drivers/gpu/drm/rcar-du/rcar_du_kms.o: in function `rcar_du_modeset_init': rcar_du_kms.c:(.text+0xdb8): undefined reference to `rcar_cmm_init' arm-linux-gnueabi-ld: drivers/firmware/qcom_scm-smc.o: in function `__scm_smc_do_quirk': arm-linux-gnueabi-ld: drivers/firmware/qcom_scm-legacy.o: in function `scm_legacy_call': arm-linux-gnueabi-ld: drivers/firmware/qcom_scm-legacy.o: in function `scm_legacy_call_atomic': qcom_scm-legacy.c:(.text+0x57c): undefined reference to `__arm_smccc_smc' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org