Hi Ng, FYI, the error/warning still remains. tree: https://github.com/intel/linux-intel-lts.git 5.10/yocto head: 2dafc777a64181d42982628c7f5907a03da5f070 commit: 367a342a05c249be8a0ea5e9d1e9dd5669a02abf [10656/20393] media: lt6911uxc:add sensor driver config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220211/202202110359.qU9GUOnQ-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/intel/linux-intel-lts/commit/367a342a05c249be8a0ea5e9d... git remote add intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-lts 5.10/yocto git checkout 367a342a05c249be8a0ea5e9d1e9dd5669a02abf # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/crypto/ drivers/gpio/ drivers/gpu/drm/i915/ drivers/media/i2c/ 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/i2c/lt6911uxc.c: In function 'lt6911uxc_init_controls': 722 | s64 hblank; | ^~~~~~ drivers/media/i2c/lt6911uxc.c: At top level: drivers/media/i2c/lt6911uxc.c:1140:14: warning: initialized field overwritten [-Woverride-init] 1140 | .s_stream = lt6911uxc_set_stream, | ^~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/lt6911uxc.c:1140:14: note: (near initialization for 'lt6911uxc_video_ops.s_stream') drivers/media/i2c/lt6911uxc.c:499:12: warning: 'lt6911uxc_query_dv_timings' defined but not used [-Wunused-function] 499 | static int lt6911uxc_query_dv_timings(struct v4l2_subdev *sd, | ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/lt6911uxc.c:468:12: warning: 'lt6911uxc_s_dv_timings' defined but not used [-Wunused-function] 468 | static int lt6911uxc_s_dv_timings(struct v4l2_subdev *sd, | ^~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/lt6911uxc.c:238:32: warning: 'lt6911uxc_ev_source_change' defined but not used [-Wunused-const-variable=] 238 | static const struct v4l2_event lt6911uxc_ev_source_change = { | ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/lt6911uxc.c:116:31: warning: 'default_timing' defined but not used [-Wunused-variable] 116 | static struct v4l2_dv_timings default_timing = V4L2_DV_BT_CEA_3840X2160P30; | ^~~~~~~~~~~~~~ vim +/hblank +722 drivers/media/i2c/lt6911uxc.c 717 718 static int lt6911uxc_init_controls(struct lt6911uxc_state *lt6911uxc) 719 { 720 struct i2c_client *client = v4l2_get_subdevdata(&lt6911uxc->sd); 721 struct v4l2_ctrl_handler *ctrl_hdlr; 723 struct v4l2_ctrl_config cfg = { 0 }; 724 int ret; 725 726 ctrl_hdlr = &lt6911uxc->ctrl_handler; 727 ret = v4l2_ctrl_handler_init(ctrl_hdlr, 8); 728 if (ret) 729 return ret; 730 731 ctrl_hdlr->lock = &lt6911uxc->mutex; 732 lt6911uxc->link_freq = 733 v4l2_ctrl_new_int_menu(ctrl_hdlr, 734 &lt6911uxc_ctrl_ops, 735 V4L2_CID_LINK_FREQ, 736 sizeof(lt6911uxc->cur_mode->pixel_clk), 737 0, (s64 *)&lt6911uxc->cur_mode->pixel_clk); 738 if (ctrl_hdlr->error) { 739 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 740 ctrl_hdlr->error); 741 return ctrl_hdlr->error; 742 } 743 if (lt6911uxc->link_freq) 744 lt6911uxc->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY; 745 746 lt6911uxc->vblank = v4l2_ctrl_new_std(ctrl_hdlr, 747 &lt6911uxc_ctrl_ops, 748 V4L2_CID_VBLANK, 0, 1, 1, 1); 749 if (ctrl_hdlr->error) { 750 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 751 ctrl_hdlr->error); 752 return ctrl_hdlr->error; 753 } 754 755 lt6911uxc->analogue_gain = v4l2_ctrl_new_std(ctrl_hdlr, 756 &lt6911uxc_ctrl_ops, 757 V4L2_CID_ANALOGUE_GAIN, 0, 1, 1, 1); 758 if (ctrl_hdlr->error) { 759 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 760 ctrl_hdlr->error); 761 return ctrl_hdlr->error; 762 } 763 764 lt6911uxc->digital_gain = v4l2_ctrl_new_std(ctrl_hdlr, 765 &lt6911uxc_ctrl_ops, 766 V4L2_CID_DIGITAL_GAIN, 0, 1, 1, 1); 767 if (ctrl_hdlr->error) { 768 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 769 ctrl_hdlr->error); 770 return ctrl_hdlr->error; 771 } 772 773 lt6911uxc->exposure = v4l2_ctrl_new_std(ctrl_hdlr, 774 &lt6911uxc_ctrl_ops, 775 V4L2_CID_EXPOSURE, 0, 1, 1, 1); 776 if (ctrl_hdlr->error) { 777 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 778 ctrl_hdlr->error); 779 return ctrl_hdlr->error; 780 } 781 782 cfg.ops = &lt6911uxc_ctrl_ops; 783 cfg.id = V4L2_CID_MIPI_LANES; 784 cfg.name = "V4L2_CID_MIPI_LANES"; 785 cfg.type = V4L2_CTRL_TYPE_INTEGER; 786 cfg.max = 4; cfg.min = 2; cfg.step = 2; cfg.def = 4; 787 cfg.qmenu = 0; cfg.elem_size = 0; 788 lt6911uxc->mipi_lanes = v4l2_ctrl_new_custom(ctrl_hdlr, &cfg, NULL); 789 if (ctrl_hdlr->error) { 790 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 791 ctrl_hdlr->error); 792 return ctrl_hdlr->error; 793 } 794 795 lt6911uxc_csi_port.def = lt6911uxc->platform_data->port; 796 lt6911uxc->csi_port = 797 v4l2_ctrl_new_custom(ctrl_hdlr, &lt6911uxc_csi_port, NULL); 798 if (ctrl_hdlr->error) { 799 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 800 ctrl_hdlr->error); 801 return ctrl_hdlr->error; 802 } 803 804 lt6911uxc_i2c_bus.def = i2c_adapter_id(client->adapter); 805 lt6911uxc->i2c_bus = 806 v4l2_ctrl_new_custom(ctrl_hdlr, &lt6911uxc_i2c_bus, NULL); 807 if (ctrl_hdlr->error) { 808 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 809 ctrl_hdlr->error); 810 return ctrl_hdlr->error; 811 } 812 813 lt6911uxc_i2c_id.def = client->addr; 814 lt6911uxc->i2c_id = v4l2_ctrl_new_custom(ctrl_hdlr, 815 &lt6911uxc_i2c_id, NULL); 816 if (ctrl_hdlr->error) { 817 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 818 ctrl_hdlr->error); 819 return ctrl_hdlr->error; 820 } 821 822 lt6911uxc_i2c_slave_address.def = 823 lt6911uxc->platform_data->i2c_slave_address; 824 lt6911uxc->i2c_slave_address = v4l2_ctrl_new_custom(ctrl_hdlr, 825 &lt6911uxc_i2c_slave_address, NULL); 826 if (ctrl_hdlr->error) { 827 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 828 ctrl_hdlr->error); 829 return ctrl_hdlr->error; 830 } 831 832 lt6911uxc_fps.def = lt6911uxc->cur_mode->fps; 833 lt6911uxc->fps = v4l2_ctrl_new_custom(ctrl_hdlr, &lt6911uxc_fps, NULL); 834 if (ctrl_hdlr->error) { 835 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 836 ctrl_hdlr->error); 837 return ctrl_hdlr->error; 838 } 839 840 lt6911uxc_frame_interval.def = 1000 / lt6911uxc->cur_mode->fps; 841 lt6911uxc->frame_interval = v4l2_ctrl_new_custom(ctrl_hdlr, 842 &lt6911uxc_frame_interval, NULL); 843 if (ctrl_hdlr->error) { 844 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 845 ctrl_hdlr->error); 846 return ctrl_hdlr->error; 847 } 848 849 lt6911uxc->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, 850 &lt6911uxc_ctrl_ops, 851 V4L2_CID_PIXEL_RATE, 852 get_pixel_rate(lt6911uxc), 853 get_pixel_rate(lt6911uxc), 1, 854 get_pixel_rate(lt6911uxc)); 855 if (ctrl_hdlr->error) { 856 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 857 ctrl_hdlr->error); 858 return ctrl_hdlr->error; 859 } 860 if (lt6911uxc->pixel_rate) 861 lt6911uxc->pixel_rate->flags |= V4L2_CTRL_FLAG_READ_ONLY; 862 863 hblank = 1; 864 lt6911uxc->hblank = v4l2_ctrl_new_std(ctrl_hdlr, 865 &lt6911uxc_ctrl_ops, 866 V4L2_CID_HBLANK, 0, 1, 1, 1); 867 if (ctrl_hdlr->error) { 868 dev_dbg(&client->dev, "Set ctrl_hdlr, err=%d.\n", 869 ctrl_hdlr->error); 870 return ctrl_hdlr->error; 871 } 872 if (lt6911uxc->hblank) 873 lt6911uxc->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY; 874 875 /* custom v4l2 audio controls */ 876 lt6911uxc->audio_sampling_rate_ctrl = v4l2_ctrl_new_custom( 877 ctrl_hdlr, &lt6911uxc_ctrl_audio_sampling_rate, NULL); 878 if (ctrl_hdlr->error) { 879 dev_dbg(&client->dev, "Set audio sampling rate ctrl, err=%d.\n", 880 ctrl_hdlr->error); 881 return ctrl_hdlr->error; 882 } 883 lt6911uxc->audio_present_ctrl = v4l2_ctrl_new_custom(ctrl_hdlr, 884 &lt6911uxc_ctrl_audio_present, NULL); 885 if (ctrl_hdlr->error) { 886 dev_dbg(&client->dev, "Set audio present ctrl, error = %d.\n", 887 ctrl_hdlr->error); 888 return ctrl_hdlr->error; 889 } 890 891 lt6911uxc->sd.ctrl_handler = ctrl_hdlr; 892 return 0; 893 } 894 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org