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It is currently unclear how to set the VCPU affinity for a percpu_devid interrupt , since the Linux irq_data structure describes the state for multiple interrupts, one for each physical CPU on the system. Since each such interrupt can be associated with different VCPUs or none at all, associating a single VCPU state with such an interrupt does not capture the necessary semantics. The implementers of irq_set_affinity are the Intel and AMD IOMMUs, and the ARM GIC irqchip. The Intel and AMD callers do not appear to use percpu_devid interrupts, and the ARM GIC implementation only checks the pointer against NULL vs. non-NULL. Therefore, simply update the function documentation to explain the expected use in the context of percpu_devid interrupts, allowing future changes or additions to irqchip implementers to do the right thing. Signed-off-by: Christoffer Dall <cdall@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Cc: kvm@vger.kernel.org Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Eric Auger <eric.auger@redhat.com> Cc: kvmarm@lists.cs.columbia.edu Cc: linux-arm-kernel@lists.infradead.org Link: https://lkml.kernel.org/r/1509093281-15225-13-git-send-email-cdall@linaro.org |
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| .. | ||
| affinity.c | ||
| autoprobe.c | ||
| chip.c | ||
| cpuhotplug.c | ||
| debug.h | ||
| debugfs.c | ||
| devres.c | ||
| dummychip.c | ||
| generic-chip.c | ||
| handle.c | ||
| internals.h | ||
| ipi.c | ||
| irq_sim.c | ||
| irqdesc.c | ||
| irqdomain.c | ||
| Kconfig | ||
| Makefile | ||
| manage.c | ||
| matrix.c | ||
| migration.c | ||
| msi.c | ||
| pm.c | ||
| proc.c | ||
| resend.c | ||
| settings.h | ||
| spurious.c | ||
| timings.c | ||