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VPFE-Driver as Module

Hi everyone!

I am modifying the the VPFE-Driver. The VPFE-Driver was built as module. I have to insert the video-buf.ko module before inserting the davinci-vpfe.ko module. But when I do insmod video-buf.ko I get the following error: "video_buf: Unknown symbol v4wb_clear_user_page" What am i doing wrong?

Thanks in advance!