> The kernel locore code  has `fast' and `normal' versions
> of the interrupt-vector glue code.  Are the `fast' vectors
> actually used anywhere?  I can't see anywhere where they're
> passed to setgate().

Bingo. They're not used. The fast vector code has been there since
ages, perhaps even since patchkit days? But it's not currently
used anywhere. I'm not sure that it will be used sometime either..

- Frank