tree: https://git.kernel.org/pub/scm/linux/kernel/git/kbingham/rcar.git vsp1/v3u head: 4b88e2d75a21f477bd1aaf9eec8c567c54ffe43d commit: 3137cddcf132248acdc0ddcba4cf33565b7ed955 [20/41] v4l: vsp1: Add debugfs system v1.8 config: x86_64-randconfig-a004-20210618 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/kbingham/rcar.git/commit/... git remote add rcar https://git.kernel.org/pub/scm/linux/kernel/git/kbingham/rcar.git git fetch --no-tags rcar vsp1/v3u git checkout 3137cddcf132248acdc0ddcba4cf33565b7ed955 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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/media/platform/vsp1/vsp1_debugfs.c:371:59: error: use of undeclared identifier 'VI6_WPF0_FRCNT' seq_printf(s, "VI6_WPF0_FRCNT = 0x%08x", vsp1_read(vsp1, VI6_WPF0_FRCNT)); ^ struct dentry *info_file; ^ 1 warning and 1 error generated. vim +/info_file +471 drivers/media/platform/vsp1/vsp1_debugfs.c 467 468 /* Debugfs initialised after entities are created */ 469 int vsp1_debugfs_init(struct vsp1_device *vsp1) 470 { 472 473 vsp1->regset.regs = vsp1_regset; 474 vsp1->regset.base = vsp1->mmio; 475 vsp1->regset.nregs = ARRAY_SIZE(vsp1_regset); 476 477 vsp1->dbgroot = debugfs_create_dir(dev_name(vsp1->dev), NULL); 478 if (!vsp1->dbgroot) 479 return -ENOMEM; 480 481 /* dentry pointer discarded */ 482 info_file = debugfs_create_file("info", 0444, 483 vsp1->dbgroot, 484 vsp1, 485 &vsp1_debugfs_info_fops); 486 487 /* dentry pointer discarded */ 488 info_file = debugfs_create_file("regs_local", 0444, 489 vsp1->dbgroot, 490 vsp1, 491 &vsp1_debugfs_regs_fops); 492 493 /* dentry pointer discarded */ 494 info_file = debugfs_create_file("reset_wpf0", 0444, 495 vsp1->dbgroot, 496 vsp1, 497 &vsp1_debugfs_reset_wpf_fops); 498 499 debugfs_create_regset32("regs", 0444, vsp1->dbgroot, &vsp1->regset); 500 501 return 0; 502 } 503 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org