Messages in this thread |  | | Date | Sun, 20 May 2001 19:12:06 +0200 | From | Andrea Arcangeli <> | Subject | Re: alpha iommu fixes |
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On Mon, May 21, 2001 at 02:54:16AM +1000, Andrew Morton wrote: > No. Most of the pci_map_single() implementations just > use virt_to_bus()/virt_to_phys(). [..]
then you are saying that on the platforms without an iommu the pci_map_* cannot fail, of course, furthmore even a missing pci_unmap cannot trigger an iommu address space leak on those platforms. That has nothing to do with the fact pci_map_single can fail or not, the device drivers are not architectural specific.
> [..] Even sparc64's fancy > iommu-based pci_map_single() always succeeds.
Whatever sparc64 does to hide the driver bugs you can break it if you pci_map 4G+1 bytes of phyical memory. Otherwise it means it's sleeping or looping inside the pci_map functions which would break things in another manner.
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