Re: x86: meaning of nolapic command line option

[Ingo Molnar]

* Jan Beulich <jbeulich@xxxxxxxxxx> wrote:

> Shouldn't that option imply that all APIC related activity, including 
> that relating to IO-APICs or PCI MSI, should be circumvented? I'm 
> finding that MSI must be disabled separately, and while most of the 
> IO-APIC stuff is indeed not happening, acpi_get_override_irq() only 
> checks skip_ioapic_setup, but that doesn't normally set without the 
> noapic command line option.
> 
> Is there any reason pci_no_msi() and disable_ioapic_setup() shouldn't be 
> called when !cpu_has_apic at the end of identify_cpu()?

Yes, both depend on a lapic and they might limp on with whatever the BIOS 
gave us, you are right that it should be disabled explicitly. Mind sending 
a patch?

	Ingo
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