I'm new to mailing lists, so I'm sorry if this message is poorly formatted. I have been compiling v4l on RH7 using very minor changes (made it into an rpm, have to remove 'v3.16_wait_on_bit.patch' from the backports) for a while now. I had been using an older set of firmware and git hash from the media_build repo for several kernels, but the latest kernel release had an issue loading the modules. I've tried some of the latest kernel releases, 3.10.0-693.el7.x86_64 and 3.10.0-693.5.2.el7.x86_64. They build with a few compiler warnings, but still build successfully. After installing the new kernel, updated rpm, and rebooting, I get the following in dmesg: videobuf2_v4l2: Unknown symbol vb2_buffer_in_use (err 0) videobuf2_v4l2: Unknown symbol vb2_core_queue_init (err 0) videobuf2_v4l2: Unknown symbol vb2_verify_memory_type (err 0) videobuf2_v4l2: Unknown symbol vb2_core_reqbufs (err 0) videobuf2_v4l2: Unknown symbol vb2_core_expbuf (err 0) videobuf2_v4l2: Unknown symbol vb2_core_create_bufs (err 0) videobuf2_v4l2: disagrees about version of symbol vb2_write videobuf2_v4l2: Unknown symbol vb2_write (err -22) videobuf2_v4l2: Unknown symbol vb2_core_queue_release (err 0) videobuf2_v4l2: Unknown symbol vb2_core_prepare_buf (err 0) videobuf2_v4l2: disagrees about version of symbol vb2_read videobuf2_v4l2: Unknown symbol vb2_read (err -22) videobuf2_v4l2: Unknown symbol vb2_core_poll (err 0) videobuf2_v4l2: Unknown symbol vb2_core_streamon (err 0) videobuf2_v4l2: Unknown symbol vb2_core_querybuf (err 0) videobuf2_v4l2: Unknown symbol vb2_core_qbuf (err 0) videobuf2_v4l2: disagrees about version of symbol vb2_mmap videobuf2_v4l2: Unknown symbol vb2_mmap (err -22) videobuf2_v4l2: Unknown symbol vb2_core_dqbuf (err 0) videobuf2_v4l2: Unknown symbol vb2_core_streamoff (err 0) Since the videobuf2-core module loaded, I'm not sure why the symbols are missing. If I compile and install using the latest git versions using the rpm and locally on the box (using './build' and 'make install'), I get the same results. I've tried looking into issues with the symbols not being exported, but the code seems to have them there, and considering this used to work, I'm a at a loss. Some of the warnings on build include various files that report: WARNING: /root/rpmbuild/BUILD/v4l/media_build/v4l/dvb-core.o (.discard.unreachable): unexpected non-allocatable section. Did you forget to use "ax"/"aw" in a .S file? Note that for example <linux/init.h> contains section definitions for use in .S files. After which this block comes up: WARNING: "frame_vector_to_pages" [/root/rpmbuild/BUILD/v4l/media_build/v4l/videobuf2-vmalloc.ko] undefined! WARNING: "frame_vector_to_pfns" [/root/rpmbuild/BUILD/v4l/media_build/v4l/videobuf2-vmalloc.ko] undefined! WARNING: "dma_buf_export_named" [/root/rpmbuild/BUILD/v4l/media_build/v4l/videobuf2-vmalloc.ko] undefined! WARNING: "frame_vector_create" [/root/rpmbuild/BUILD/v4l/media_build/v4l/videobuf2-memops.ko] undefined! WARNING: "frame_vector_destroy" [/root/rpmbuild/BUILD/v4l/media_build/v4l/videobuf2-memops.ko] undefined! WARNING: "get_vaddr_frames" [/root/rpmbuild/BUILD/v4l/media_build/v4l/videobuf2-memops.ko] undefined! WARNING: "put_vaddr_frames" [/root/rpmbuild/BUILD/v4l/media_build/v4l/videobuf2-memops.ko] undefined! WARNING: "frame_vector_to_pages" [/root/rpmbuild/BUILD/v4l/media_build/v4l/videobuf2-dma-sg.ko] undefined! WARNING: "dma_buf_export_named" [/root/rpmbuild/BUILD/v4l/media_build/v4l/videobuf2-dma-sg.ko] undefined! WARNING: "frame_vector_to_pages" [/root/rpmbuild/BUILD/v4l/media_build/v4l/videobuf2-dma-contig.ko] undefined! WARNING: "frame_vector_to_pfns" [/root/rpmbuild/BUILD/v4l/media_build/v4l/videobuf2-dma-contig.ko] undefined! WARNING: "dma_buf_export_named" [/root/rpmbuild/BUILD/v4l/media_build/v4l/videobuf2-dma-contig.ko] undefined! WARNING: "v4l_vb2q_enable_media_source" [/root/rpmbuild/BUILD/v4l/media_build/v4l/videobuf2-core.ko] undefined! WARNING: "v4l2_mc_create_media_graph" [/root/rpmbuild/BUILD/v4l/media_build/v4l/saa7134.ko] undefined! WARNING: "syscon_regmap_lookup_by_phandle" [/root/rpmbuild/BUILD/v4l/media_build/v4l/ir-hix5hd2.ko] undefined! WARNING: "v4l2_mc_create_media_graph" [/root/rpmbuild/BUILD/v4l/media_build/v4l/em28xx-v4l.ko] undefined! WARNING: "__v4l2_ctrl_s_ctrl" [/root/rpmbuild/BUILD/v4l/media_build/v4l/cx8800.ko] undefined! WARNING: "__v4l2_ctrl_s_ctrl" [/root/rpmbuild/BUILD/v4l/media_build/v4l/cx88-alsa.ko] undefined! WARNING: "__v4l2_ctrl_s_ctrl" [/root/rpmbuild/BUILD/v4l/media_build/v4l/cx23885.ko] undefined! I don't recall these errors in earlier builds, and I'm not sure if they are perhaps related to the issues I'm getting on module load. Any help is appreciated. Zach
