prepare x86/ppc64 DISCONTIG code for hotplug

Subject pretty much says it all. Descriptions are in the individual patches. These patches replace the "allow-hot-add-enabled-i386-numa-box-to-boot.patch" which is currently in -mm. Please drop it.

They apply to 2.6.11-rc5 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. These probably deserve to stay in -mm for a release or two.

-- Dave

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Most of these patches needed little fixups due to other patches which you folks have already sent me:

	allow-hot-add-enabled-i386-numa-box-to-boot
	refactor-i386-memory-setup
	consolidate-set_max_mapnr_init-implementations

I'll try to get a -mm out this evening - please retest this stuff. --
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