xencomm take 4: preparation for consolidation and various fixes

This xencomm take 4 patch series is for xencomm various
fixes.
I fixed its coding style. The resulting code is same as take
3 except 
the coding style.

[PATCH 1/3] xencomm take 4: xen side fix invalid or racy
access
[PATCH 2/3] xencomm take 4: xen side multiple page support
[PATCH 3/3] xencomm take 4: linux side remove xencomm page
size limit


Changes from take 3:
dropped commited patches. 
code style.
resulting code is same as take 2 except coding style.

Changes from take 2:
xen side
  - Split up into 4 patches and clean them up.
  - add more race checks
Linux side:
  - no change

Changes from take 1:
xen side varisous fixes and preparation for consolidation
  - sorted out the maddr and vaddr issue
  - returning an error with warning message instead of
panicing domain.
linux side various fixes and preparation for consolidation
  - update gcc work around.
    It is a generic issue, not ia64 specific.

Thanks,

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