Hi Jacopo, I love your patch! Perhaps something to improve: [auto build test WARNING on media-tree/master] [also build test WARNING on v5.16-rc5 next-20211215] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Jacopo-Mondi/media-adv748x-Add-C... base: git://linuxtv.org/media_tree.git master config: arm-randconfig-r032-20211216 (https://download.01.org/0day-ci/archive/20211217/202112171102.NMwa0uem-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dd245bab9fbb364faa1581e4f92ba3119a872fba) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/0day-ci/linux/commit/3baa5f567748a7235338c2547dcec5959... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jacopo-Mondi/media-adv748x-Add-CSI-2-VC-support/20211217-010519 git checkout 3baa5f567748a7235338c2547dcec595902888b7 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/media/i2c/adv748x/ kernel/ 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/adv748x/adv748x-csi2.c:190:33: error: array has incomplete element type 'struct v4l2_subdev_route' struct v4l2_subdev_route routes[ADV748X_CSI2_STREAMS] = { ^ drivers/media/i2c/adv748x/adv748x-csi2.c:190:9: note: forward declaration of 'struct v4l2_subdev_route' struct v4l2_subdev_route routes[ADV748X_CSI2_STREAMS] = { ^ drivers/media/i2c/adv748x/adv748x-csi2.c:196:13: error: use of undeclared identifier 'V4L2_SUBDEV_ROUTE_FL_ACTIVE'; did you mean 'V4L2_SUBDEV_FORMAT_ACTIVE'? .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE, ^~~~~~~~~~~~~~~~~~~~~~~~~~~ V4L2_SUBDEV_FORMAT_ACTIVE include/uapi/linux/v4l2-subdev.h:39:2: note: 'V4L2_SUBDEV_FORMAT_ACTIVE' declared here V4L2_SUBDEV_FORMAT_ACTIVE = 1, ^ drivers/media/i2c/adv748x/adv748x-csi2.c:217:30: error: variable has incomplete type 'struct v4l2_subdev_krouting' struct v4l2_subdev_krouting routing; ^ drivers/media/i2c/adv748x/adv748x-csi2.c:217:9: note: forward declaration of 'struct v4l2_subdev_krouting' struct v4l2_subdev_krouting routing; ^ drivers/media/i2c/adv748x/adv748x-csi2.c:223:2: error: implicit declaration of function 'v4l2_subdev_lock_state' [-Werror,-Wimplicit-function-declaration] v4l2_subdev_lock_state(state); ^ drivers/media/i2c/adv748x/adv748x-csi2.c:223:2: note: did you mean 'v4l2_subdev_alloc_state'? include/media/v4l2-subdev.h:1144:27: note: 'v4l2_subdev_alloc_state' declared here struct v4l2_subdev_state *v4l2_subdev_alloc_state(struct v4l2_subdev *sd); ^ drivers/media/i2c/adv748x/adv748x-csi2.c:224:8: error: implicit declaration of function 'v4l2_subdev_set_routing' [-Werror,-Wimplicit-function-declaration] ret = v4l2_subdev_set_routing(sd, state, &routing); ^ drivers/media/i2c/adv748x/adv748x-csi2.c:225:2: error: implicit declaration of function 'v4l2_subdev_unlock_state' [-Werror,-Wimplicit-function-declaration] v4l2_subdev_unlock_state(state); ^ drivers/media/i2c/adv748x/adv748x-csi2.c:225:2: note: did you mean 'v4l2_subdev_lock_state'? drivers/media/i2c/adv748x/adv748x-csi2.c:223:2: note: 'v4l2_subdev_lock_state' declared here v4l2_subdev_lock_state(state); ^ drivers/media/i2c/adv748x/adv748x-csi2.c:241:2: error: implicit declaration of function 'v4l2_subdev_lock_state' [-Werror,-Wimplicit-function-declaration] v4l2_subdev_lock_state(sd_state); ^ drivers/media/i2c/adv748x/adv748x-csi2.c:242:8: error: implicit declaration of function 'v4l2_state_get_stream_format' [-Werror,-Wimplicit-function-declaration] fmt = v4l2_state_get_stream_format(sd_state, sdformat->pad, ^ drivers/media/i2c/adv748x/adv748x-csi2.c:242:8: note: did you mean 'v4l2_subdev_get_try_format'? include/media/v4l2-subdev.h:994:1: note: 'v4l2_subdev_get_try_format' declared here v4l2_subdev_get_try_format(struct v4l2_subdev *sd, ^ drivers/media/i2c/adv748x/adv748x-csi2.c:243:19: error: no member named 'stream' in 'struct v4l2_subdev_format' sdformat->stream); ~~~~~~~~ ^ drivers/media/i2c/adv748x/adv748x-csi2.c:251:8: error: implicit declaration of function 'v4l2_subdev_state_get_opposite_stream_format' [-Werror,-Wimplicit-function-declaration] fmt = v4l2_subdev_state_get_opposite_stream_format(sd_state, sdformat->pad, ^ drivers/media/i2c/adv748x/adv748x-csi2.c:252:21: error: no member named 'stream' in 'struct v4l2_subdev_format' sdformat->stream); ~~~~~~~~ ^ drivers/media/i2c/adv748x/adv748x-csi2.c:260:2: error: implicit declaration of function 'v4l2_subdev_unlock_state' [-Werror,-Wimplicit-function-declaration] v4l2_subdev_unlock_state(sd_state); ^ drivers/media/i2c/adv748x/adv748x-csi2.c:309:10: error: implicit declaration of function 'v4l2_subdev_lock_active_state' [-Werror,-Wimplicit-function-declaration] state = v4l2_subdev_lock_active_state(sd); ^ state = v4l2_subdev_lock_active_state(sd); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/adv748x/adv748x-csi2.c:312:18: error: no member named 'routing' in 'struct v4l2_subdev_state' route = &state->routing.routes[0]; ~~~~~ ^ drivers/media/i2c/adv748x/adv748x-csi2.c:313:8: error: implicit declaration of function 'v4l2_state_get_stream_format' [-Werror,-Wimplicit-function-declaration] fmt = v4l2_state_get_stream_format(state, pad, route->source_stream); ^ drivers/media/i2c/adv748x/adv748x-csi2.c:313:54: error: incomplete definition of type 'struct v4l2_subdev_route' fmt = v4l2_state_get_stream_format(state, pad, route->source_stream); ~~~~~^ drivers/media/i2c/adv748x/adv748x-csi2.c:301:9: note: forward declaration of 'struct v4l2_subdev_route' struct v4l2_subdev_route *route; ^ drivers/media/i2c/adv748x/adv748x-csi2.c:327:6: error: no member named 'type' in 'struct v4l2_mbus_frame_desc' fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2; ~~ ^ drivers/media/i2c/adv748x/adv748x-csi2.c:327:13: error: use of undeclared identifier 'V4L2_MBUS_FRAME_DESC_TYPE_CSI2'; did you mean 'V4L2_MBUS_FRAME_DESC_FL_BLOB'? fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ V4L2_MBUS_FRAME_DESC_FL_BLOB include/media/v4l2-subdev.h:327:2: note: 'V4L2_MBUS_FRAME_DESC_FL_BLOB' declared here V4L2_MBUS_FRAME_DESC_FL_BLOB = BIT(1), ^ drivers/media/i2c/adv748x/adv748x-csi2.c:330:9: error: no member named 'stream' in 'struct v4l2_mbus_frame_desc_entry' entry->stream = 0; ~~~~~ ^ fatal error: too many errors emitted, stopping now [-ferror-limit=] 1 warning and 20 errors generated. vim +309 drivers/media/i2c/adv748x/adv748x-csi2.c 229 230 static int adv748x_csi2_set_format(struct v4l2_subdev *sd, 231 struct v4l2_subdev_state *sd_state, 232 struct v4l2_subdev_format *sdformat) 233 { 234 struct v4l2_mbus_framefmt *fmt; 235 int ret = 0; 236 237 /* Do not allow to set format on the multiplexed source pad. */ 238 if (sdformat->pad == ADV748X_CSI2_SOURCE) 239 return -EINVAL; 240 241 v4l2_subdev_lock_state(sd_state); 242 fmt = v4l2_state_get_stream_format(sd_state, sdformat->pad, 243 sdformat->stream); 244 if (!fmt) { 245 ret = -EINVAL; 246 goto out; 247 }; 248 *fmt = sdformat->format; 249 250 /* Propagate format to the other end of the route. */ 251 fmt = v4l2_subdev_state_get_opposite_stream_format(sd_state, sdformat->pad, 253 if (!fmt) { 254 ret = -EINVAL; 255 goto out; 256 } 257 *fmt = sdformat->format; 258 259 out: 260 v4l2_subdev_unlock_state(sd_state); 261 262 return ret; 263 } 264 265 static int adv748x_csi2_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad, 266 struct v4l2_mbus_config *config) 267 { 268 struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd); 269 270 if (pad != ADV748X_CSI2_SOURCE) 271 return -EINVAL; 272 273 config->type = V4L2_MBUS_CSI2_DPHY; 274 switch (tx->active_lanes) { 275 case 1: 276 config->flags = V4L2_MBUS_CSI2_1_LANE; 277 break; 278 279 case 2: 280 config->flags = V4L2_MBUS_CSI2_2_LANE; 281 break; 282 283 case 3: 284 config->flags = V4L2_MBUS_CSI2_3_LANE; 285 break; 286 287 case 4: 288 config->flags = V4L2_MBUS_CSI2_4_LANE; 289 break; 290 } 291 292 return 0; 293 } 294 295 static int adv748x_csi2_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad, 296 struct v4l2_mbus_frame_desc *fd) 297 { 298 struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd); 299 struct adv748x_csi2_format_info info = {}; 300 struct v4l2_mbus_frame_desc_entry *entry; 301 struct v4l2_subdev_route *route; 302 struct v4l2_subdev_state *state; 303 struct v4l2_mbus_framefmt *fmt; 304 int ret; 305 306 if (pad != ADV748X_CSI2_SOURCE) 307 return -EINVAL; 308 310 311 /* A single route is available. */ 312 route = &state->routing.routes[0]; 313 fmt = v4l2_state_get_stream_format(state, pad, route->source_stream); 314 if (!fmt) { 315 ret = -EINVAL; 316 goto out; 317 } 318 319 ret = adv748x_csi2_get_format_info(tx, fmt->code, &info); 320 if (ret) 321 goto out; 322 323 memset(fd, 0, sizeof(*fd)); 324 325 /* A single stream is available. */ 326 fd->num_entries = 1; 327 fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2; 328 329 entry = &fd->entry[0]; 330 entry->stream = 0; 331 entry->flags = V4L2_MBUS_FRAME_DESC_FL_LEN_MAX; 332 entry->length = fmt->width * fmt->height * info.bpp / 8; 333 entry->pixelcode = fmt->code; 334 entry->bus.csi2.vc = route->source_stream; 335 entry->bus.csi2.dt = info.dt; 336 337 out: 338 v4l2_subdev_unlock_state(state); 339 340 return ret; 341 } 342 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org