Re: Is it useful to support user level drivers

Matthias Urlichs (smurf@noris.de)
Thu, 21 Jun 2001 16:03:49 +0200

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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