On Mon, 2009-03-02 at 18:55 +0100, Bartlomiej Zolnierkiewicz wrote:
> IDE IRQ handler (& probably many others) assume that IRQ layer won't be
> trying to call it again while IRQ is being serviced -- is this going to
> change with the introduction of threaded IRQs?

No, the real hardirq handler needs to disable the irq line before
telling it wants the thread to run. The thread will then have to
re-enable the irq line after its done.