tree: https://git.pengutronix.de/git/pza/linux v5.6/topic/pcie-fpga-link-wip head: 020dd50455b9d67bca68173966ce176e0c6fe87e commit: 96f8ccc96212e0da4a3a307c489baf31f077df1e [8/12] fixup! media: fpl: added pcie-fpga link skeleton driver config: arm64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 5227fa0c72ce55927cf4849160acb00442489937) reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 96f8ccc96212e0da4a3a307c489baf31f077df1e # save the attached .config to linux build tree COMPILER=clang make.cross ARCH=arm64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/media/pci/pcie-fpga-link/pcie-fpga-link.c:602:21: warning: unused variable 'fpl_dev' [-Wunused-variable] struct fpl_device *fpl_dev = video_drvdata(file); ^ case V4L2_CID_DV_RX_POWER_PRESENT: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/uapi/linux/v4l2-controls.h:1079:39: note: expanded from macro 'V4L2_CID_DV_RX_POWER_PRESENT' #define V4L2_CID_DV_RX_POWER_PRESENT (V4L2_CID_DV_CLASS_BASE + 100) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/pci/pcie-fpga-link/pcie-fpga-link.c:672:9: note: uninitialized use occurs here return ret; ^~~ drivers/media/pci/pcie-fpga-link/pcie-fpga-link.c:658:9: note: initialize the variable 'ret' to silence this warning int ret; ^ = 0 drivers/media/pci/pcie-fpga-link/pcie-fpga-link.c:714:1: warning: non-void function does not return a value [-Wreturn-type] } ^ drivers/media/pci/pcie-fpga-link/pcie-fpga-link.c:724:28: warning: ISO C90 forbids mixing declarations and code [-Wdeclaration-after-statement] struct v4l2_captureparm *cp = &parm->parm.capture; ^ drivers/media/pci/pcie-fpga-link/pcie-fpga-link.c:719:22: warning: unused variable 'fpl' [-Wunused-variable] struct fpl_device *fpl = video_drvdata(file); ^ drivers/media/pci/pcie-fpga-link/pcie-fpga-link.c:844:20: error: assigning to 'struct fpl_metadata *' from 'const struct fpl_metadata *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers] fpl_dev->metadata = &metadata_set[fpl_dev->metadata_no]; ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 5 warnings and 1 error generated. vim +/ret +667 drivers/media/pci/pcie-fpga-link/pcie-fpga-link.c 655 656 static int fpl_device_s_ctrl_handler(struct v4l2_ctrl *ctrl) 657 { 658 int ret; 659 struct fpl_device *fpl_dev = 660 container_of(ctrl->handler, struct fpl_device, ctrl_handler); 661 printk("CTRL: %d\n", ctrl->id); 662 switch (ctrl->id) { 663 case CUSTOM_CID_CHANGE_FORMAT: 664 fpl_dev->metadata_no ^= 1; 665 ret = 0; 666 break; 668 break; 669 default: 670 return -EINVAL; 671 } 672 return ret; 673 } 674 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org