[kbuild-all] drivers/media/i2c/ov5648.c:2035:39: warning: taking address of packed member 'handler' of class or structure 'ov5648_ctrls' may result in an unaligned pointer value

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: d999ade1cc86cd2951d41c11ea769cb4452c8811 commit: e43ccb0a045f34838b786e8021dc4838b4af5c38 media: i2c: Add support for the OV5648 image sensor date: 9 months ago config: mips-buildonly-randconfig-r004-20211018 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 746dd6a700931988dd9021d3d04718f1929885a5) 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 mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # 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 e43ccb0a045f34838b786e8021dc4838b4af5c38 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=mips 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 >>): struct v4l2_ctrl_handler *handler = &ctrls->handler; ^~~~~~~~~~~~~~ v4l2_ctrl_auto_cluster(2, &ctrls->exposure_auto, 1, true); ^~~~~~~~~~~~~~~~~~~~ v4l2_ctrl_auto_cluster(2, &ctrls->gain_auto, 0, true); ^~~~~~~~~~~~~~~~ v4l2_ctrl_auto_cluster(3, &ctrls->white_balance_auto, 0, false); ^~~~~~~~~~~~~~~~~~~~~~~~~ 4 warnings generated. vim +2035 drivers/media/i2c/ov5648.c 2031 2032 static int ov5648_ctrls_init(struct ov5648_sensor *sensor) 2033 { 2034 struct ov5648_ctrls *ctrls = &sensor->ctrls; 2036 const struct v4l2_ctrl_ops *ops = &ov5648_ctrl_ops; 2037 int ret; 2038 2039 v4l2_ctrl_handler_init(handler, 32); 2040 2041 /* Use our mutex for ctrl locking. */ 2042 handler->lock = &sensor->mutex; 2043 2044 /* Exposure */ 2045 2046 ctrls->exposure_auto = v4l2_ctrl_new_std_menu(handler, ops, 2047 V4L2_CID_EXPOSURE_AUTO, 2048 V4L2_EXPOSURE_MANUAL, 0, 2049 V4L2_EXPOSURE_AUTO); 2050 2051 ctrls->exposure = v4l2_ctrl_new_std(handler, ops, V4L2_CID_EXPOSURE, 2052 16, 1048575, 16, 512); 2053 2055 2056 /* Gain */ 2057 2058 ctrls->gain_auto = 2059 v4l2_ctrl_new_std(handler, ops, V4L2_CID_AUTOGAIN, 0, 1, 1, 1); 2060 2061 ctrls->gain = v4l2_ctrl_new_std(handler, ops, V4L2_CID_GAIN, 16, 1023, 2062 16, 16); 2063 2065 2066 /* White Balance */ 2067 2068 ctrls->white_balance_auto = 2069 v4l2_ctrl_new_std(handler, ops, V4L2_CID_AUTO_WHITE_BALANCE, 0, 2070 1, 1, 1); 2071 2072 ctrls->red_balance = v4l2_ctrl_new_std(handler, ops, 2073 V4L2_CID_RED_BALANCE, 0, 4095, 2074 1, 1024); 2075 2076 ctrls->blue_balance = v4l2_ctrl_new_std(handler, ops, 2077 V4L2_CID_BLUE_BALANCE, 0, 4095, 2078 1, 1024); 2079 2081 2082 /* Flip */ 2083 2084 v4l2_ctrl_new_std(handler, ops, V4L2_CID_HFLIP, 0, 1, 1, 0); 2085 v4l2_ctrl_new_std(handler, ops, V4L2_CID_VFLIP, 0, 1, 1, 0); 2086 2087 /* Test Pattern */ 2088 2089 v4l2_ctrl_new_std_menu_items(handler, ops, V4L2_CID_TEST_PATTERN, 2090 ARRAY_SIZE(ov5648_test_pattern_menu) - 1, 2091 0, 0, ov5648_test_pattern_menu); 2092 2093 /* MIPI CSI-2 */ 2094 2095 ctrls->link_freq = 2096 v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ, 2097 ARRAY_SIZE(ov5648_link_freq_menu) - 1, 2098 0, ov5648_link_freq_menu); 2099 2100 ctrls->pixel_rate = 2101 v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE, 1, 2102 INT_MAX, 1, 1); 2103 2104 if (handler->error) { 2105 ret = handler->error; 2106 goto error_ctrls; 2107 } 2108 2109 ctrls->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE; 2110 ctrls->gain->flags |= V4L2_CTRL_FLAG_VOLATILE; 2111 2112 ctrls->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY; 2113 ctrls->pixel_rate->flags |= V4L2_CTRL_FLAG_READ_ONLY; 2114 2115 sensor->subdev.ctrl_handler = handler; 2116 2117 return 0; 2118 2119 error_ctrls: 2120 v4l2_ctrl_handler_free(handler); 2121 2122 return ret; 2123 } 2124 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org