[Oops] apic, smp and k6

[Oops] apic, smp and k6

[Andreas Jellinghaus]

a dual board (meant for pentium) with one k6 200 and
a 2.4.0-test11 kernel with APIC support enabled does
oops here. removed the APIC support, and now everything is fine.
i read here it´s a known problem ? at least someone
else reported this, and it´s the same problem here.

regards, andreas

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[Oops] apic, smp and k6

[Torsten Duwe]

>>>>> "Andreas" == Andreas Jellinghaus <aj@dungeon.inka.de> writes:

    Andreas> a dual board (meant for pentium) with one k6 200 and a
    Andreas> 2.4.0-test11 kernel with APIC support enabled does oops
    Andreas> here. removed the APIC support, and now everything is fine.  i
    Andreas> read here it´s a known problem ? at least someone else reported
    Andreas> this, and it´s the same problem here.

Yes, a colleague of mine has a similar beast, hence Caldera ships for quite a
while now with an appropriate patch. Now Christoph Hellwig has identified a
simpler solution (updated for -test11 by me):

--- linux/arch/i386/kernel/setup.c~	Fri Jul  7 04:42:06 2000
+++ linux/arch/i386/kernel/setup.c	Tue Jul 18 19:22:48 2000
@@ -785,7 +785,8 @@
 	/*
 	 * get boot-time SMP configuration:
 	 */
-	if (smp_found_config)
+	if (smp_found_config && /* try only if the cpu has a local apic */
+	    test_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability))
 		get_smp_config();
 #endif
 #ifdef CONFIG_X86_LOCAL_APIC


I think Alan has a similar thing in his test11-ac* series.

Hope that helps,

	Torsten
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Re: [Oops] apic, smp and k6

[Alan Cox]

> while now with an appropriate patch. Now Christoph Hellwig has identifi=
> ed a
> simpler solution (updated for -test11 by me):
> 
> --- linux/arch/i386/kernel/setup.c~	Fri Jul  7 04:42:06 2000
> +++ linux/arch/i386/kernel/setup.c	Tue Jul 18 19:22:48 2000
> @@ -785,7 +785,8 @@
>  	/*
>  	 * get boot-time SMP configuration:
>  	 */
> -	if (smp_found_config)
> +	if (smp_found_config && /* try only if the cpu has a local apic */
> +	    test_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability))
>  		get_smp_config();

This patch unfortunately does break some real setups, since it is legal to
have non APIC on the CPU but an APIC as an addon chip.

> I think Alan has a similar thing in his test11-ac* series.

Maciej Rozycki provided a much better test, that from reports so far seems
to be working

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