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    SubjectRe: [RFC] Fix NMI watchdog documentation
    On 26 May 2003 01:31:41 -0400, Disconnect <lkml@sigkill.net> wrote:
    >> OK, I put together a kernel that had the Latitude blacklist commented out,
    >> and it comes up with:
    >>
    >> No local APIC present or hardware disabled
    >> Initializing CPU#0
    >>
    >> So add the Latitude C840 to the "known b0rken" list.
    >
    >Ditto the Inspiron 8500 - no apic at all (which is different from
    >known-broken, since nothing bad happened.)
    ...
    >Perhaps just a comment above those entries:
    >/* Latitude C840 and Inspiron 8500 have no APIC support in hardware */

    If these machines are P4-based, then I bet they do have local APICs.
    However, if the BIOS boots the kernel with the local APIC disabled
    on a P4, we (apic.c) don't try to enable it. The logic behind that
    is that "modern" BIOSen _should_ boot with it enabled, unless they're
    horribly broken.

    So apply the patch below and try the "can we get the machine to hang"
    checklist again.

    /Mikael

    --- linux-2.5.69/arch/i386/kernel/apic.c.~1~ 2003-04-20 13:08:15.000000000 +0200
    +++ linux-2.5.69/arch/i386/kernel/apic.c 2003-05-26 11:11:19.000000000 +0200
    @@ -617,7 +617,7 @@
    goto no_apic;
    case X86_VENDOR_INTEL:
    if (boot_cpu_data.x86 == 6 ||
    - (boot_cpu_data.x86 == 15 && cpu_has_apic) ||
    + (boot_cpu_data.x86 == 15) ||
    (boot_cpu_data.x86 == 5 && cpu_has_apic))
    break;
    goto no_apic;
    -
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