Differences between mainline kernels 4.4-rc7 and rc8 configuration files:
doug@s15:~/temp-k-git/linux$ diff /boot/config-4.4.0-040400rc7-generic /boot/config-4.4.0-040400rc8-generic
3c3
< # Linux/x86_64 4.4.0-040400rc7-generic Kernel Configuration
---
> # Linux/x86_64 4.4.0-040400rc8-generic Kernel Configuration
393c393
< CONFIG_ZONE_DMA=y
---
> # CONFIG_ZONE_DMA is not set
517,518c517
< CONFIG_ZONE_DMA_FLAG=1
< CONFIG_BOUNCE=y
---
> CONFIG_ZONE_DMA_FLAG=0
545a545
> CONFIG_ZONE_DEVICE=y
5449c5449
< CONFIG_SND_EMU10K1_SEQ=m
---
> # CONFIG_SND_EMU10K1_SEQ is not set
5469d5468
< CONFIG_SND_ALS300=m
5471d5469
< CONFIG_SND_ALI5451=m
5479d5476
< CONFIG_SND_AZT3328=m
5504,5505d5500
< CONFIG_SND_EMU10K1=m
< CONFIG_SND_EMU10K1X=m
5508,5511d5502
< CONFIG_SND_ES1938=m
< CONFIG_SND_ES1968=m
< CONFIG_SND_ES1968_INPUT=y
< CONFIG_SND_ES1968_RADIO=y
5516d5506
< CONFIG_SND_ICE1712=m
5523,5524d5512
< CONFIG_SND_MAESTRO3=m
< CONFIG_SND_MAESTRO3_INPUT=y
5532,5533d5519
< CONFIG_SND_SONICVIBES=m
< CONFIG_SND_TRIDENT=m
7448a7435,7436
> CONFIG_ND_PFN=m
> CONFIG_NVDIMM_PFN=y