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    SubjectRe: [tip:irq/numa] x86: read apic ID in the !acpi_lapic case
    Cyrill Gorcunov wrote:
    > [Ingo Molnar - Tue, May 12, 2009 at 06:46:17PM +0200]
    > |
    > | got this on a testbox:
    > |
    > | [ 0.113333] WARNING: at arch/x86/kernel/apic/apic.c:253 warn_slowpath_null+0x28/0x50()
    > |
    > | Ingo
    > |
    >
    > It's expected (unfortunately). If we have SMP compiled kernel
    > we still rely on apic_read heavily. Since for fake'ed apic
    > we just return 0 for any reading I suspect we could just drop
    > WARN_ON_ONCE for native_apic_read_dummy. Yinghai?
    >
    > (well, actually we should clean up callees but it would require
    > some effort)

    32bit seems doesn't have this warning.

    and on 64bit, we always assumed have local APIC there. so could be that noapic is not cleanly enforced

    YH


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