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The Power Management Capability (PCI_CAP_ID_PM == 0x01) is defined by PCI and must appear in the 256-byte PCI Configuration Space from 0-0xff. It cannot be in the PCIe Extended Configuration space from 0x100-0xfff, so we only need a u8 to hold its offset. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>