Resubmitting 1GB page shm patchkit

[Andi Kleen]

This patchkit allows to specify 1GB (and other) page sizes with
shmget(). This is useful for programs who are difficult to modify
to use mmap.

I got positive reviews last time I submitted this. I also get 
requests from various users who want it. So here's a resend with:

- Rebased to current mainline
- Retested
- Fixed a minor umount problem.

Please consider for merging.

-Andi


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