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    SubjectRe: PROBLEM: APIC on a Pentium Classic SMP, kernel 2.4.21-pre5 to 2.4.23-pre3
    On Sun, 07 Sep 2003 18:37:48 -0400, Mathieu Desnoyers wrote:
    >IRQ problems with APIC enabled on a Neptune chipset, Pentium 90 SMP.
    >Since kernel 2.4.21-pre2, IRQ problems are present on my Pentium 90 SMP, wi=
    >APIC enabled. It works well with 2.4.20 with APIC enabled, or with newer
    >kernels with "noapic" kernel option.

    There were a lot of I/O-APIC & MP table parsing changes in 2.4.21
    for clustered apic. Chances are something there broke on your
    ancient BIOS & mobo. I can't immediately see anything obviously
    broken in 2.4.21: you'll have to identify the first pre-patch where
    things broke and then test or revert it piece by piece.

    >On kernel 2.4.21-pre2, there is a kernel oops before this, with a
    >"Dereferencing NULL pointer".

    You didn't run that through ksymoops and post it, so how is anyone
    supposed to be able to debug it?
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