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    SubjectRe: [RFC -tip] x86,apic -- reduce disable_apic usage
    [H. Peter Anvin - Sun, Jul 05, 2009 at 10:30:11AM -0700]
    | Maciej W. Rozycki wrote:
    | >
    | > How do you set cpu_has_apic for systems with discrete local APICs? The
    | > CPUID flag is not set in this case.
    | >
    | Well, should it be? We do set flags when they're appropriate to us, and
    | if the semantics are such as that is inappropriate we can set a custom bit.
    | -hpa

    Peter, Maciej but how kernel behaved on older cpu long time ago?

    I mean -- should user pass "lapic" cmdline option too be
    able to use apic functionality? (i'm asking since I just
    don't know how it had been working before). Current
    code (if only I'm not _missing_ something) relies on cpu_has_apic
    bit. And even if MP table has been parsed and APIC base found,
    cpu_has_apic could be not set so detect_init_APIC will fail
    if no "lapic" option passed (in case of old cpu without this cpuid
    bit produced) as we eventually stay with pic mode.

    -- Cyrill

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