Hi Robby, FYI, the error/warning still remains. tree: https://github.com/Freescale/linux-fslc 5.10-2.1.x-imx head: 75eab1d328d473c7078d78e269160acb2090efbe commit: 54afb73e27b624db97f55baee1b45800db182cd0 [13121/15146] LF-4159-3 video: epdc: add support for imx8ulp config: x86_64-randconfig-c007-20210927 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dc6e8dfdfe7efecfda318d43a06fae18b40eb498) 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/54afb73e27b624db97f55baee1... git remote add freescale-fslc https://github.com/Freescale/linux-fslc git fetch --no-tags freescale-fslc 5.10-2.1.x-imx git checkout 54afb73e27b624db97f55baee1b45800db182cd0 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 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 >>): drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:812:15: warning: variable 'ext_temp' is uninitialized when used here [-Wuninitialized] ext_temp = ext_temp >> 8; ^~~~~~~~ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:807:23: note: initialize the variable 'ext_temp' to silence this warning unsigned int ext_temp, ext_temp_index = temp; ^ = 0 drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:990:35: warning: result of comparison of constant 18446744073709551615 with expression of type 'unsigned int' is always true [-Wtautological-constant-out-of-range-compare] (__raw_readl(EPDC_STATUS_LUTS2) != ~0UL)) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:4686:7: warning: variable 'upd_buf_ptr' set but not used [-Wunused-but-set-variable] u32 *upd_buf_ptr; ^ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:6014:12: warning: implicit conversion from enumeration type 'enum dma_data_direction' to different enumeration type 'enum dma_transfer_direction' [-Wenum-conversion] DMA_TO_DEVICE, ^~~~~~~~~~~~~ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:6195:12: warning: implicit conversion from enumeration type 'enum dma_data_direction' to different enumeration type 'enum dma_transfer_direction' [-Wenum-conversion] DMA_TO_DEVICE, ^~~~~~~~~~~~~ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:6332:12: warning: implicit conversion from enumeration type 'enum dma_data_direction' to different enumeration type 'enum dma_transfer_direction' [-Wenum-conversion] DMA_TO_DEVICE, ^~~~~~~~~~~~~ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:6480:12: warning: implicit conversion from enumeration type 'enum dma_data_direction' to different enumeration type 'enum dma_transfer_direction' [-Wenum-conversion] DMA_TO_DEVICE, ^~~~~~~~~~~~~ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:6677:12: warning: implicit conversion from enumeration type 'enum dma_data_direction' to different enumeration type 'enum dma_transfer_direction' [-Wenum-conversion] DMA_TO_DEVICE, ^~~~~~~~~~~~~ In file included from drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:31: include/linux/pxp_dma.h:58:12: warning: unused function 'register_pxp_device' [-Wunused-function] static int register_pxp_device(void) { return 0; } ^ include/linux/pxp_dma.h:59:13: warning: unused function 'unregister_pxp_device' [-Wunused-function] static void unregister_pxp_device(void) {} ^ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:1028:20: warning: unused function 'epdc_reset_used_lut' [-Wunused-function] static inline void epdc_reset_used_lut(void) ^ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:726:20: warning: unused function 'dump_pxp_config' [-Wunused-function] static inline void dump_pxp_config(struct mxc_epdc_fb_data *fb_data, ^ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:729:20: warning: unused function 'dump_update_data' [-Wunused-function] static inline void dump_update_data(struct device *dev, ^ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:731:20: warning: unused function 'dump_collision_list' [-Wunused-function] static inline void dump_collision_list(struct mxc_epdc_fb_data *fb_data) {} ^ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:732:20: warning: unused function 'dump_free_list' [-Wunused-function] static inline void dump_free_list(struct mxc_epdc_fb_data *fb_data) {} ^ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:733:20: warning: unused function 'dump_queue' [-Wunused-function] static inline void dump_queue(struct mxc_epdc_fb_data *fb_data) {} ^ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:734:20: warning: unused function 'dump_all_updates' [-Wunused-function] static inline void dump_all_updates(struct mxc_epdc_fb_data *fb_data) {} ^ drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:1015:19: warning: unused function 'epdc_get_next_lut' [-Wunused-function] static inline int epdc_get_next_lut(void) ^ static const struct of_device_id imx_epdc_dt_ids[] = { ^ 19 warnings generated. vim +/imx_epdc_dt_ids +4953 drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c 7a85fd4c966b93 Robby Cai 2019-08-21 4952 7a85fd4c966b93 Robby Cai 2019-08-21 @4953 static const struct of_device_id imx_epdc_dt_ids[] = { 7a85fd4c966b93 Robby Cai 2019-08-21 4954 { .compatible = "fsl,imx7d-epdc", }, 7a85fd4c966b93 Robby Cai 2019-08-21 4955 { /* sentinel */ } 7a85fd4c966b93 Robby Cai 2019-08-21 4956 }; 7a85fd4c966b93 Robby Cai 2019-08-21 4957 MODULE_DEVICE_TABLE(of, imx_epdc_dt_ids); 7a85fd4c966b93 Robby Cai 2019-08-21 4958 :::::: The code at line 4953 was first introduced by commit :::::: 7a85fd4c966b93ed26e1ce152b3476246e9959dc video: epdc: add epdc driver :::::: TO: Robby Cai <robby.cai(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