Thank you for all your reviews and comments on the previous posts.

In this version, I newly added two patches. One is to separate arch
dependency commented by KOSAKI-san, and the other is to introduce
new type pme_t as commented by Andrew.
And I changed "export KPF_THP" patch to fix an unnoticed bug where
both of KPF_THP and with KPF_HUGE are set for hugetlbfs hugepage.

Thanks,
Naoya