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When built with: CONFIG_USB=m CONFIG_VIDEO_USBVISION=y It causes ld errors: ld: drivers/staging/media/usbvision/usbvision-core.o: in function `usbvision_write_reg_irq': usbvision-core.c:(.text+0x8a4): undefined reference to `usb_submit_urb' ld: drivers/staging/media/usbvision/usbvision-core.o: in function `usbvision_isoc_irq': usbvision-core.c:(.text+0x2ee8): undefined reference to `usb_submit_urb' ld: drivers/staging/media/usbvision/usbvision-core.o: in function `usbvision_read_reg': usbvision-core.c:(.text+0x30ad): undefined reference to `usb_control_msg' ld: drivers/staging/media/usbvision/usbvision-core.o: in function `usbvision_write_reg': usbvision-core.c:(.text+0x3178): undefined reference to `usb_control_msg' ld: drivers/staging/media/usbvision/usbvision-core.o: in function `usbvision_set_output': usbvision-core.c:(.text+0x344e): undefined reference to `usb_control_msg' ld: drivers/staging/media/usbvision/usbvision-core.o: in function `usbvision_set_input': usbvision-core.c:(.text+0x3b9b): undefined reference to `usb_control_msg' ld: drivers/staging/media/usbvision/usbvision-core.o: in function `usbvision_setup': usbvision-core.c:(.text+0x4009): undefined reference to `usb_control_msg' ld: drivers/staging/media/usbvision/usbvision-core.o:usbvision-core.c:(.text+0x417f): more undefined references to `usb_control_msg' follow ld: drivers/staging/media/usbvision/usbvision-core.o: in function `usbvision_set_alternate': usbvision-core.c:(.text+0x4518): undefined reference to `usb_set_interface' ld: drivers/staging/media/usbvision/usbvision-core.o: in function `usbvision_init_isoc': usbvision-core.c:(.text+0x4673): undefined reference to `usb_alloc_urb' ld: usbvision-core.c:(.text+0x46a5): undefined reference to `usb_alloc_coherent' ld: usbvision-core.c:(.text+0x4765): undefined reference to `usb_submit_urb' ld: drivers/staging/media/usbvision/usbvision-core.o: in function `usbvision_stop_isoc': usbvision-core.c:(.text+0x4837): undefined reference to `usb_kill_urb' ld: usbvision-core.c:(.text+0x485f): undefined reference to `usb_free_coherent' ld: usbvision-core.c:(.text+0x4874): undefined reference to `usb_free_urb' ld: usbvision-core.c:(.text+0x48f1): undefined reference to `usb_set_interface' ld: drivers/staging/media/usbvision/usbvision-video.o: in function `usbvision_release': usbvision-video.c:(.text+0x1a8a): undefined reference to `usb_free_urb' ld: drivers/staging/media/usbvision/usbvision-video.o: in function `usbvision_disconnect': usbvision-video.c:(.text+0x1b74): undefined reference to `usb_put_dev' ld: drivers/staging/media/usbvision/usbvision-video.o: in function `usbvision_radio_close': usbvision-video.c:(.text+0x1c89): undefined reference to `usb_set_interface' ld: drivers/staging/media/usbvision/usbvision-video.o: in function `usbvision_probe': usbvision-video.c:(.text+0x1e4b): undefined reference to `usb_get_dev' ld: usbvision-video.c:(.text+0x20e1): undefined reference to `usb_alloc_urb' ld: usbvision-video.c:(.text+0x2797): undefined reference to `usb_put_dev' ld: drivers/staging/media/usbvision/usbvision-video.o: in function `usbvision_exit': usbvision-video.c:(.exit.text+0x37): undefined reference to `usb_deregister' ld: drivers/staging/media/usbvision/usbvision-video.o: in function `usbvision_init': usbvision-video.c:(.init.text+0xf9): undefined reference to `usb_register_driver' ld: drivers/staging/media/usbvision/usbvision-i2c.o: in function `usbvision_i2c_write': usbvision-i2c.c:(.text+0x2f4): undefined reference to `usb_control_msg' Reported-by: Randy Dunlap <rdunlap@infradead.org> Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.