SMP broken on pre-ACPI machine.

[Dave Jones <davej@redhat.com>]

I've been chasing a bug that got filed against the Fedora kernel
a while back:  https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=199052
This is a dual pentium pro from an era before we had ACPI, and
it seems to be falling foul of this test in smpboot.c  ..

    if (!smp_found_config && !acpi_lapic) {
        printk(KERN_NOTICE "SMP motherboard not detected.\n");
        smpboot_clear_io_apic_irqs();
        phys_cpu_present_map = physid_mask_of_physid(0);
        if (APIC_init_uniprocessor())
            printk(KERN_NOTICE "Local APIC not detected."
                       " Using dummy APIC emulation.\n");
        map_cpu_to_logical_apicid();
        cpu_set(0, cpu_sibling_map[0]);
        cpu_set(0, cpu_core_map[0]);
        return;
    }


My initial reaction is that the !acpi_lapic test should be conditional
on some variable that gets set if the ACPI parsing actually succeeded.

Thoughts?

	Dave

-- 
http://www.codemonkey.org.uk
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