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    SubjectRe: APIC version and 8-bit APIC IDs
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    Martin Wilck <martin.wilck@fujitsu-siemens.com> writes:

    > Hi William, hello everyone,
    >
    > The MP_valid_apicid() function [arch/i386/kernel/mpparse.c] checks
    > whether the APIC version field is >=20 in order to determine whether
    > the CPU supports 8-bit physical APIC ids.

    Yes, it's broken. In fact I removed it in my physflat32 patch
    which is needed for 16 core AMD systems. I don't think there
    is a generic way to fix it because the XAPIC check breaks
    on AMD systems and there is no good way to decide early
    on subarchitectures before doing this check. Also it's only
    a sanity check for broken BIOS, and in this case it causes more problems
    than it solves.

    ftp://ftp.firstfloor.org/pub/ak/x86_64/x86_64-2.6.13rc3-1/patches/physflat32

    Will hopefully be fixed in 2.6.14.

    -Andi
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