Description of problem:
Xen 3.1.1 has a couple of changesets that fix some possible bugs in the x86_64
vsyscall page. They are in xen-3.1-testing.hg, c/s 15092 and 15125. We should
determine whether we want/need these changesets.
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Applying these two changesets cause only cosmetic change - instead of code mk_kernel_pgd(address) is used its expansion __pgd(address | _TABLE_PAGE). There can be reason to use only c/s 15092 that add _PAGE_USER flag to parameter address.
I'm going to close this. It looks cosmetic, and if we do decided to do vsyscall, it's going to require a lot more than this. We have other bugs open to cover enabling Xen vsyscall.
Clearing out old flags for reporting purposes.