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PFN_PHYS() can truncate large addresses unless its passed a suitable large type. This is fixed more generally in the patch series introducing phys_addr_t, but we need a short-term fix to solve a Xen regression reported by Roberto De Ioris. Reported-by: Roberto De Ioris <roberto@unbit.it> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>