[parisc-linux] Thoughts on arch/parisc/irq.c

LaMont Jones lamont@security.hp.com
Thu, 26 Aug 1999 10:43:29 -0600

> No.  You just do
> gsc_writel(0xfffe0000 + dev->irq, dev->hpa + DEVICE_SPECIFIC_OFFSET);
> right after request_irq(dev->irq, ...);
> Is it ok with you if we worry about SMP and PA2.0 boxes later ?

Writing to the specific HPA is most likely a SMP issue as well, but if we
go the route of using global broadcast interrupts, we should leave some
__really__ large handwriting on the wall for when SMP gets dealt with.
The mad dash to handle an interrupt is a great way to thrash the machine.

Likewise, if there's a clean way to get the processor HPA in the IRQ value,
there is no reason not to do it now, and avoid tracking down the problems