> > read and write sometimes lock and DMA from user pages in new driver toys
> > using Stephen's rawio and kiovec stuff. You would need to be careful how
> > you arranged it to avoid shooting yourself in the foot on future optimisations
>
> Ouch... And what happens if we do write() _not_ from user page? I can't
> think of a place that would write to character device from kernel space,
> but...
I can't at the moment but it would be bad to preclude it.
Alan
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