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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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