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    SubjectRe: [RFC] prevent "dd if=/dev/mem" crash
    Matt Chapman <matthewc@cse.unsw.edu.au> wrote:
    >
    > It *does* signal a fault, in the form of a machine check. On other
    > architectures I'm familiar with this is usually implemented as an
    > interrupt, but the idea is similar - when the system bus controller
    > detects a bad address on the bus, it returns all 1s (for a read) and
    > signals an interrupt.

    I see. That seems OK. At least it means that software can implement a
    probing function and that the time interval between hot unplug and handling
    the unplug interrupt can be managed appropriately.


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