Re: spurious 8259A interrupt: IRQ7

[Jesper Juhl <jesper.juhl@gmail.com>]

On 4/14/05, Bjorn Helgaas <bjorn.helgaas@hp.com> wrote:
> On Thu, 2005-04-14 at 16:56 -0400, Lee Revell wrote:
> > Is the VIA IRQ fixup related to the "spurious interrupts" messages in
> > any way?  Googling the 2.4 threads on the issue gave me the impression
> > that it's related to broken hardware.  I think excessive disk activity
> > might trigger it.
> 
> If you need the VIA IRQ fixup and don't have it, I would expect
> some interrupt to be routed to the wrong IRQ.  That might give
> you a "spurious interrupt" on the wrong IRQ, but your device would
> probably just not work at all.
> 

For what it's worth I'll chime in with my own info on this subject.

I also see the 
   spurious 8259A interrupt: IRQ7.
messages from time to time. Actually I got one just a little while ago : 
   $ dmesg | grep spurious
   [18994.222451] spurious 8259A interrupt: IRQ7.
The system seems to be in good shape - it has never caused me any
actual trouble.

As for the via irq fixup I see this :
   $ dmesg | grep -i fixup
   [   74.629393] PCI: Via PIC IRQ fixup for 0000:00:09.0, from 255 to 3

The hardware is a ASUS A7M266 mobo with a AMD Athlon (t-bird) 1.4GHz CPU.

The kernel is 2.6.12-rc4-mm2 : 
   $ uname -a
   Linux dragon 2.6.12-rc4-mm2 #2 Mon May 16 18:14:13 CEST 2005 i686
unknown unknown GNU/Linux

I've seen some references to APIC for this issue, so here are the APIC
related settings in my .config :

   juhl@dragon:~/download/kernel/linux-2.6.12-rc4-mm2$ grep -i APIC .config
   CONFIG_X86_GOOD_APIC=y
   # CONFIG_X86_UP_APIC is not set


-- 
Jesper Juhl <jesper.juhl@gmail.com>
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