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    SubjectRe: [PATCH 6/29] x86-apic-virtwire-on-shutdown
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    On Wed, 2005-01-19 at 02:31, Eric W. Biederman wrote:
    > When coming out of apic mode attempt to set the appropriate
    > apic back into virtual wire mode. This improves on previous versions
    > of this patch by by never setting bot the local apic and the ioapic
    > into veritual wire mode.
    >
    > This code looks at data from the mptable to see if an ioapic has
    > an ExtInt input to make this decision. A future improvement
    > is to figure out which apic or ioapic was in virtual wire mode
    > at boot time and to remember it. That is potentially a more accurate
    > method, of selecting which apic to place in virutal wire mode.
    >

    The call to find_isa_irq_pin() will always fail on ACPI-enabled systems,
    so this patch is a NO-OP unless the system is booted in MPS mode.

    Do we really want to be adding this complexity for obsolete systems?
    Are there systems that fail without this patch?

    -Len


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