From: Nick Andrew The description of the interrupt routing doesn't match the (nice) diagram. Signed-off-by: Nick Andrew Cc: Ingo Molnar Cc: Thomas Gleixner Signed-off-by: Andrew Morton --- Documentation/i386/IO-APIC.txt | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN Documentation/i386/IO-APIC.txt~documentation-i386-io-apictxt-fix-description Documentation/i386/IO-APIC.txt --- a/Documentation/i386/IO-APIC.txt~documentation-i386-io-apictxt-fix-description +++ a/Documentation/i386/IO-APIC.txt @@ -68,7 +68,7 @@ every PCI card emits a PCI IRQ, which ca These INTA-D PCI IRQs are always 'local to the card', their real meaning depends on which slot they are in. If you look at the daisy chaining diagram, -a card in slot4, issuing INTA IRQ, it will end up as a signal on PIRQ2 of +a card in slot4, issuing INTA IRQ, it will end up as a signal on PIRQ4 of the PCI chipset. Most cards issue INTA, this creates optimal distribution between the PIRQ lines. (distributing IRQ sources properly is not a necessity, PCI IRQs can be shared at will, but it's a good for performance _