SG_ENT_PHYS_ADDRESS  514 arch/alpha/kernel/pci_iommu.c #define SG_ENT_PHYS_ADDRESS(SG) __pa(SG_ENT_VIRT_ADDRESS(SG))
SG_ENT_PHYS_ADDRESS   36 arch/sparc/kernel/iommu_common.h #define SG_ENT_PHYS_ADDRESS(SG)	(__pa(sg_virt((SG))))