re: SMP Interrupt patches

Peter T. Waltenberg (
Thu, 22 Jan 1998 18:30:42 +1300 (NZDT)

That certainly fits with what I saw, I finally got my scsi driver
to work by using the bios to lock all but one of the unused IRQ's
as ISA only. I still havn't worked out what the mapping is , but
with all slots forced to use the same IRQ that really doesn't
matter any more.

I suspect you'll have to have a table of motherboards to sort out
the mapping, but again, with some doc's, and the ability to tell
the kernel NOT to use the IO-APIC code as a boot parameter, or better
enabled only via a boot parameter, it looks quite safe.

Maybe a table of KNOWN motherboards ?, with a manual setting in
the configure scripts for people who have an "unknown" board,
but who are willing to sort out the mapping.
If neither is set, turn off the IO-APIC code.

Just a thought, the basic APIC code seems amazing stable for its
first real test. The real problem of working out the slot->apic
mapping seems unlikely to just go away of it's own accord.