The comments in the mips/kernel Makefile indicate that the SGIs need a
different IRQ setup, and so they don't use mips/kernel/irq.c.
And yet, in mips/kernel/irq.c, we have things like:
I presume that this stuff is vestigial from davem's early hacking, but
I'm wondering whether it's best to try and hack local_irq_count,
etc. support into indyIRQ.S, or to try and integrate the Indy support
into irq.c. I'm much better with C, so the latter is tempting, but I
figure there's a reason Dave decided to keep them separate.
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