prepare x86/ppc64 DISCONTIG code for hotplug

Subject pretty much says it all. Descriptions are in the individual patches.

They apply to 2.6.11-rc4 after a few patches from -mm which conflicted:

stop-using-base-argument-in-__free_pages_bulk.patch consolidate-set_max_mapnr_init-implementations.patch refactor-i386-memory-setup.patch remove-free_all_bootmem-define.patch mostly-i386-mm-cleanup.patch

Boot-tested on plain x86 laptop, NUMAQ, and Summit.

-- Dave

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