Need help in enable configuration when compile Kernel module

[Valentina Manea]

On Fri, Jan 10, 2014 at 4:16 AM, m silverstri
<michael.j.silverstri at gmail.com> wrote:
> I am using 3.10.x kernel tree. My kernel module needs config VIDEOBUF2.
>
> That is defined in drivers/media/v4l2-core/Kconfig:
>
> # Used by drivers that need Videobuf2 modules
> config VIDEOBUF2_CORE
> select DMA_SHARED_BUFFER
> tristate
>
> So I put 'CONFIG_VIDEOBUF2_CORE=y' in my Kernel config file and
> compile. From the Kconfig it has CONFIG_VIDEOBUF2_CORE has no
> dependency and I think adding CONFIG_VIDEOBUF2_CORE=y to my kernel
> config should work. I am modify the right kernel config file since I
> set other flags like CONFIG_VIDEO_DEV=y and that works.
>
> The generated .config does not contain 'CONFIG_VIDEOBUF2_CORE=y'
>
> and the compilation fails with  a bunch of
>
> undefined reference to `vb2_buffer_done'
> undefined reference to `vb2_buffer_done'
> undefined reference to `vb2_buffer_done'
> undefined reference to `vb2_buffer_done'
>
> I really appreciate if someone can help me with this.
>
> Thank you.

Hi,

Never, never, ever, put lines by hand into your config file.
Use make menuconfig and configure it from there.

Tina