stable/for-linus-3.7-rc0-tag

Feature:
 - Register a pfn_is_ram helper to speed up reading of /proc/vmcore.
Bug-fixes:
 - Three pvops call for Xen were undefined causing BUG_ONs.
 - Add a quirk so that the shutdown watches (used by kdump) are not used with older Xen (3.4).
 - Fix ungraceful state transition for the HVC console.
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