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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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