ia64 memory hotplug for hugetlbpages [0/4]

Hello,
I ported Takahashi-san's memory hotplug patches for hugetlbpages to ia64.
The patches are against linux 2.6.7 and work with memory hotplug patches which Iwamoto-san, Takahashi-san and Terasawa-san posted.

Restriction:

* There still remains a problem that patch [15/16] and [16/16] posted by Takahashi-san on July 14 could not be compiled on IA64. Now I am considering it.
At ia64, please don't apply the above patches.

How to apply:

1) First of all, apply patches which are posted by Takahashi-san

     on July 14 without [15-16/16]. 

　2) Then, aplly all of Terasawa-san's patches.
3) And, apply this set of patches.

Thank you,
Nobuhiko Yoshida.