for-next/pgtable branch: OOM error with 16K page size

Hi All,

I am trying to use the for-next/pgtable branch with the top commit, 

commit 068a17a5805dfbca4bbf03e664ca6b19709cc7a8
Author: Mark Rutland [off-list ref]
Date: ? Mon Jan 25 11:45:12 2016 +0000

? ? arm64: mm: create new fine-grained mappings at boot? ??

Setup: ARMv8, Cavium ThunderX, 48Cores 64G ram.
linux config: defconfig + 16k page size.

Observations:
a)?During linux boot I see some oom messages?
http://pastebin.com/8jSMFhqf

b) cat /proc/meminfo

MemTotal:??????   66613760 kB  
MemFree:????????? 307328 kB       
MemAvailable:????? 22416 kB  

Available memory is very less compared to total.

c) With 64K pagesize?
MemTotal:?????? 66831552 kB       
MemFree:???????? 3541184 kB       
MemAvailable:??? 3298752 kB    

So it seems there is some issue with 16k only. 
Need some inputs how to fix this

 Regards, 
Manish Jaggi