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    SubjectRe: alpha iommu fixes
    > What are these "devices", and what drivers "just program the cards to
    > start the dma on those hundred mbyte of ram"?
    > Are we designing Linux for hypothetical systems with hypothetical
    > devices and drivers, or for the real world?

    Ok how about a PIV Xeon with 64Gb of memory and 5 AMI Megaraids, which are
    limited to the low 2Gb range for pci mapping and otherwise need bounce buffers.
    Or how about any consistent alloc on certain HP machines which totally lack
    coherency - also I suspect the R10K on an O2 might fall into that - Ralf ?

    Look at the history of kernel API's over time. Everything that can go wrong
    eventually does.

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