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SubjectRe: [PATCH] x86/sfi: fix ioapic gsi range
> > 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

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