Hi Sergey, I love your patch! Yet something to improve: [auto build test ERROR on linuxtv-media/master] [also build test ERROR on v5.9-rc4 next-20200911] [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/Sergey-Senozhatsky/media-v4l2-re... base: git://linuxtv.org/media_tree.git master config: x86_64-randconfig-a004-20200911 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 0448d11a06b451a63a8f60408fec613ad24801ba) 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 # 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 errors (new ones prefixed by >>): ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, 0, &req->count); ~~~~~~~~~~~~~~~~ ^~~~~~~~~~~ include/media/videobuf2-core.h:770:5: note: 'vb2_core_reqbufs' declared here int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, ^ 1 error generated. # https://github.com/0day-ci/linux/commit/ef3d23bb3087aac00acdc21e175566608... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sergey-Senozhatsky/media-v4l2-remove-V4L2-FLAG-MEMORY-NON-CONSISTENT-flag/20200911-110822 git checkout ef3d23bb3087aac00acdc21e175566608466f139 vim +345 drivers/media/dvb-core/dvb_vb2.c 57868acc369ab73 Satendra Singh Thakur 2017-12-18 332 57868acc369ab73 Satendra Singh Thakur 2017-12-18 333 int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req) 57868acc369ab73 Satendra Singh Thakur 2017-12-18 334 { 57868acc369ab73 Satendra Singh Thakur 2017-12-18 335 int ret; 57868acc369ab73 Satendra Singh Thakur 2017-12-18 336 2c06aa7c31cfad2 Mauro Carvalho Chehab 2017-12-28 337 /* Adjust size to a sane value */ 2c06aa7c31cfad2 Mauro Carvalho Chehab 2017-12-28 338 if (req->size > DVB_V2_MAX_SIZE) 2c06aa7c31cfad2 Mauro Carvalho Chehab 2017-12-28 339 req->size = DVB_V2_MAX_SIZE; 2c06aa7c31cfad2 Mauro Carvalho Chehab 2017-12-28 340 2c06aa7c31cfad2 Mauro Carvalho Chehab 2017-12-28 341 /* FIXME: round req->size to a 188 or 204 multiple */ 2c06aa7c31cfad2 Mauro Carvalho Chehab 2017-12-28 342 57868acc369ab73 Satendra Singh Thakur 2017-12-18 343 ctx->buf_siz = req->size; 57868acc369ab73 Satendra Singh Thakur 2017-12-18 344 ctx->buf_cnt = req->count; 7b4b45555c79db0 Sergey Senozhatsky 2020-05-14 @345 ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, 0, &req->count); 57868acc369ab73 Satendra Singh Thakur 2017-12-18 346 if (ret) { 57868acc369ab73 Satendra Singh Thakur 2017-12-18 347 ctx->state = DVB_VB2_STATE_NONE; 57868acc369ab73 Satendra Singh Thakur 2017-12-18 348 dprintk(1, "[%s] count=%d size=%d errno=%d\n", ctx->name, 57868acc369ab73 Satendra Singh Thakur 2017-12-18 349 ctx->buf_cnt, ctx->buf_siz, ret); 57868acc369ab73 Satendra Singh Thakur 2017-12-18 350 return ret; 57868acc369ab73 Satendra Singh Thakur 2017-12-18 351 } 57868acc369ab73 Satendra Singh Thakur 2017-12-18 352 ctx->state |= DVB_VB2_STATE_REQBUFS; 57868acc369ab73 Satendra Singh Thakur 2017-12-18 353 dprintk(3, "[%s] count=%d size=%d\n", ctx->name, 57868acc369ab73 Satendra Singh Thakur 2017-12-18 354 ctx->buf_cnt, ctx->buf_siz); 57868acc369ab73 Satendra Singh Thakur 2017-12-18 355 57868acc369ab73 Satendra Singh Thakur 2017-12-18 356 return 0; 57868acc369ab73 Satendra Singh Thakur 2017-12-18 357 } 57868acc369ab73 Satendra Singh Thakur 2017-12-18 358 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org