Commit 3ca57222 authored Jun 20, 2017 by Thomas Gleixner

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>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Hellwig <hch@lst.de>
Link: http://lkml.kernel.org/r/20170619235447.508846202@linutronix.de

parent 8f31a984

arch/x86/kernel/apic/vector.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -371,6 +371,13 @@ static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq,
		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;