I have a system with 4GB ram and two Hauppauge PVR-500 cards (each
with a daughter card). With kernel 4.0.9 both the cards were working
fine. However, after upgrading to 8GB ram, the kernel paniced with an
error, "Random memory could be DMA written".

I upgraded to kernel 4.4.21 which is latest stable release for gentoo.
The system again panicked on bootup. However, if i disable the
following module options
(https://www.mythtv.org/wiki/Hauppauge_PVR-350)  the system boots up

options ivtv enc_mpg_buffers=16 enc_yuv_buffers=20 enc_pcm_buffers=640 debug=3

Any idea how can i use these options?

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