Re: [PATCH] x86/sfi: fix ioapic gsi range

[H. Peter Anvin]

On 06/08/2010 01:10 AM, Alan Cox wrote:
>>> You may not use a 1-1 mapping if you don't have legacy irqs.  Linux
>>> irqs 0-15 are the ISA irqs you may not use those irq numbers for
> 
> Linux IRQ 0 is "no IRQ assigned", except buried in certain bits of arch
> specific historical knowledge.
> 
> Also calling 1-15 ISA IRQ lines is also somewhat misleading given they
> are almost certainly routing for PCI devices. "PIC IRQ routing" maybe -
> but even that is not really true on a lot of PC hardware today except by
> convention.

Yes, but I gather IRQ/GSI 0 is an early-acquire primary timer on MRST on
Moorestown just as on PC/AT... just a different one.  Hence "special" in
the same sort of way.  I don't really care, personally, though.

	-hpa

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/