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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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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.