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SubjectRe: UP local APIC is deadly on SMP Athlon
On Fri, 21 Feb 2003, Ion Badulescu wrote:

> Anyway, I'll keep on digging.

And this is what I found: eliminating two lines from
APIC_init_uniprocessor() makes the problem go away.

diff -urNX diff_kernel_excludes linux-2.4.10-pre12/arch/i386/kernel/apic.c linux-2.4.10-pre11++/arch/i386/kernel/apic.c
--- linux-2.4.10-pre12/arch/i386/kernel/apic.c Wed Feb 19 23:53:15 2003
+++ linux-2.4.10-pre11++/arch/i386/kernel/apic.c Fri Feb 21 15:37:06 2003
@@ -1087,9 +1087,6 @@


- phys_cpu_present_map = 1;
- apic_write_around(APIC_ID, boot_cpu_id);

[patch against 2.4.10-pre12, but 2.4.21-pre4 is reasonably similar]


It is better to keep your mouth shut and be thought a fool,
than to open it and remove all doubt.

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