Commit-ID: 3ca57222c36ba31b80aa25de313f3c8ab26a8102 Gitweb: http://git.kernel.org/tip/3ca57222c36ba31b80aa25de313f3c8ab26a8102 Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx> AuthorDate: Tue, 20 Jun 2017 01:37:54 +0200 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Thu, 22 Jun 2017 18:21:26 +0200 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@xxxxxxxxxxxxx> Cc: Jens Axboe <axboe@xxxxxxxxx> Cc: Marc Zyngier <marc.zyngier@xxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Keith Busch <keith.busch@xxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxx> Link: http://lkml.kernel.org/r/20170619235447.508846202@xxxxxxxxxxxxx --- arch/x86/kernel/apic/vector.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c index b270a76..2567dc0 100644 --- 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_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; -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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