paravirt_ops updates

Hi Andi,

This series of patches updates paravirt_ops in various ways.  Some of the
changes are plain cleanups and improvements, and some add some interfaces
necessary for Xen.

The brief overview:

add-MAINTAINERS.patch			- obvious
remove-CONFIG_DEBUG_PARAVIRT.patch	- no longer needed
paravirt-nop.patch			- mark nop operations consistently
paravirt-pte-accessors.patch		- operations to pack/unpack ptes
paravirt-memory-init.patch		- hooks for memory/pagetable init
paravirt-fixmap.patch			- add fixmap for paravirt boot
shared-kernel-pmd.patch			- allow selectable shared kernel pmd
mm-lifetime-hooks.patch			- hooks for mm dup/activate/exit
paravirt-patch-rename-paravirt_patch.patch - rename patch structure for clarity
paravirt-use-offset-site-ids.patch	- use patch-site id derived from offset
paravirt-fix-clobbers.patch		- fix register clobbers for patch sites
paravirt-patchable-call-wrappers.patch	- wrap paravirt calls for patching
paravirt-patch-machinery.patch		- common patch machinery
paravirt-flush_tlb_others.patch		- paravirt hook for cross-cpu tlb flushing
revert-map_pt_hook.patch		- back out map_pt_hook
paravirt-kmap_atomic_pte.patch		- add kmap_atomic_pte for highpte
paravirt-sched-clock.patch		- hook to measure schedulable time

Thanks,
	J

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