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SubjectRe: [PATCH 1/3] Separate IRQ-stacks from 4K-stacks option

* Chris Wedgwood <cw@f00f.org> wrote:

> > but it's not a big problem with IRQ threading, there most hardirqs
> > are preemptable.
>
> most? what determines which and when?

it depends on how it uses spinlocks. E.g. most of the IDE irq handler
can run preemptible. Check out the voluntary-preempt patches (and VP
discussions on lkml).

Ingo
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