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    Subject[patch 54/55] x86/apic: Mark single target interrupts
    If the interrupt destination mode of the APIC is physical then the
    effective affinity is restricted to a single CPU.

    Mark the interrupt accordingly in the domain allocation code, so the core
    code can avoid pointless affinity setting attempts.

    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    ---
    arch/x86/kernel/apic/vector.c | 7 +++++++
    1 file changed, 7 insertions(+)

    --- a/arch/x86/kernel/apic/vector.c
    +++ b/arch/x86/kernel/apic/vector.c
    @@ -371,6 +371,13 @@ static int x86_vector_alloc_irqs(struct
    irq_data);
    if (err)
    goto error;
    + /*
    + * If the apic destination mode is physical, then the
    + * effective affinity is restricted to a single target
    + * CPU. Mark the interrupt accordingly.
    + */
    + if (!apic->irq_dest_mode)
    + irqd_set_single_target(irq_data);
    }

    return 0;

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