Re: spurious interrupt with ac kernel but not with vanilla 2.4.9

Alan Cox
2001-09-21T16:59:02Z

> I noticed that on the abit kt7A MBs that i have, with via KT133A chipset,
> after i installed the kernel 2.4.9-ac10 (ac11 and 12 as well),
> at boot i get this message,
>
> Sep 21 11:52:11 DarkStar kernel: ice 00:0b.0
> Sep 21 11:52:11 DarkStar kernel: spurious 8259A interrupt: IRQ7.
> immediatelly before scsi adaptec detection and inizzializzation.

Thats indicating an IRQ appeared and vanished. IRQ 7 is the IRQ that happens
to occur for this.

> I was thinking to an HW problem, but with vanilla 2.4.9 kernel I do not
> get this message, and the code in arch/i386/kernel/i8259.c that should
> detect this spurious interrup is just the same on those two kernels.
> Changes are related to X86_IO_APIC, and I think this is the reason why
> this spurious interrupt is detected, but I would like to know if i should
> think I have some HW problem going on that stardard kernels do not detect.

The APIC only applies to multiprocessor boxes unless you are building with
uniprocessor apic support. Build a non SMP kernel without apic support
and let me know what that does