tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.4 head: 9d43dae2e392875899bd5387f80bfc6ee35b162f commit: bbca48582a7342c1201691ce0eb08f1538376538 [34/57] BACKPORT: FROMLIST: virtio_video: Add the Virtio Video V4L2 driver config: s390-allyesconfig (attached as .config) compiler: s390-linux-gcc (GCC) 9.3.0 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 git checkout bbca48582a7342c1201691ce0eb08f1538376538 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): 156 | int virtio_video_dec_init_ctrls(struct virtio_video_stream *stream) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/virtio/virtio_video_dec.c:177:5: warning: no previous prototype for 'virtio_video_dec_init_queues' [-Wmissing-prototypes] 177 | int virtio_video_dec_init_queues(void *priv, struct vb2_queue *src_vq, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/virtio/virtio_video_dec.c:335:5: warning: no previous prototype for 'virtio_video_dec_enum_fmt_vid_out' [-Wmissing-prototypes] 335 | int virtio_video_dec_enum_fmt_vid_out(struct file *file, void *fh, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 417 | int virtio_video_dec_init(struct video_device *vd) | ^~~~~~~~~~~~~~~~~~~~~ drivers/media/virtio/virtio_video_dec.c: In function 'virtio_video_dec_init': drivers/media/virtio/virtio_video_dec.c:419:10: warning: variable 'num' set but not used [-Wunused-but-set-variable] 419 | ssize_t num; | ^~~ -- drivers/media/virtio/virtio_video_enc.c:162:5: warning: no previous prototype for 'virtio_video_enc_init_ctrls' [-Wmissing-prototypes] 162 | int virtio_video_enc_init_ctrls(struct virtio_video_stream *stream) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/virtio/virtio_video_enc.c:223:5: warning: no previous prototype for 'virtio_video_enc_init_queues' [-Wmissing-prototypes] 223 | int virtio_video_enc_init_queues(void *priv, struct vb2_queue *src_vq, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ 559 | int virtio_video_enc_init(struct video_device *vd) | ^~~~~~~~~~~~~~~~~~~~~ drivers/media/virtio/virtio_video_enc.c: In function 'virtio_video_enc_init': 561 | ssize_t num; | ^~~ vim +/virtio_video_dec_init_ctrls +156 drivers/media/virtio/virtio_video_dec.c 155 157 { 158 struct v4l2_ctrl *ctrl; 159 160 v4l2_ctrl_handler_init(&stream->ctrl_handler, 1); 161 162 ctrl = v4l2_ctrl_new_std(&stream->ctrl_handler, 163 &virtio_video_dec_ctrl_ops, 164 V4L2_CID_MIN_BUFFERS_FOR_CAPTURE, 165 MIN_BUFS_MIN, MIN_BUFS_MAX, MIN_BUFS_STEP, 166 MIN_BUFS_DEF); 167 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; 168 169 if (stream->ctrl_handler.error) 170 return stream->ctrl_handler.error; 171 172 v4l2_ctrl_handler_setup(&stream->ctrl_handler); 173 174 return 0; 175 } 176 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org