arch_can_pci_mmap_io
!(pci_resource_is_io(pdev, bar) && arch_can_pci_mmap_io()))
#if arch_can_pci_mmap_io()
if (!arch_can_pci_mmap_io())
if (!arch_can_pci_mmap_io())
#ifndef arch_can_pci_mmap_io