iommu_unbind
iommu_unbind(aper->arena, aper->pg_start, aper->pg_count);
return iommu_unbind(aper->arena, aper->pg_start + pg_start,
iommu_unbind(aper->arena, aper->pg_start, aper->pg_count);
return iommu_unbind(aper->arena, aper->pg_start + pg_start,
extern int iommu_unbind(struct pci_iommu_arena *, long, long);