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    SubjectRe: Is it useful to support user level drivers
    At 14:28 +0100 2001-06-21, Alan Cox wrote:
    >No. The IRQ might be shared, and you get a slight problem if you just disabled
    >an IRQ needed to make progress for user space to handle the IRQ

    Two choices:

    - Disallow shared interrupts for usermode drivers.

    - Make the 'generic interrupt handler device driver' configurable
    and/or module-extensible. You only need three entry points
    ("Interrupt set?"/"Enable interrupts"/"Disable interrupts"), which is
    reasonably simple to get right.
    Matthias Urlichs
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