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Rework mark_unsafe_pages() to use a simpler method of clearing all bits in free_pages_map and to set the bits for the "unsafe" pages (ie. pages that were used by the image kernel before hibernation) with the help of duplicate_memory_bitmap(). For this purpose, move the pfn_valid() check from mark_unsafe_pages() to unpack_orig_pfns() where the "unsafe" pages are discovered. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>