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Date: Tue, 8 Nov 2016 15:56:52 +0100
From: Christoph Hellwig <hch@lst.de>
To: Hannes Reinecke <hare@suse.de>
Cc: Thomas Gleixner <tglx@linutronix.de>, Christoph Hellwig <hch@lst.de>,
        Jens Axboe <axboe@kernel.dk>, linux-block@vger.kernel.org,
        linux-pci@vger.kernel.org,
        Linux Kernel Mailinglist <linux-kernel@vger.kernel.org>,
        Hannes Reinecke <hare@suse.com>
Subject: Re: [RFC PATCH] pci: add pci_irq_get_affinity_vector()
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On Tue, Nov 08, 2016 at 08:47:21AM +0100, Hannes Reinecke wrote:
> Add a reverse-mapping function to return the interrupt vector for
> any CPU if interrupt affinity is enabled.

What's the use case of it?

Also as-is this won't work due to the non-affinity vectors that
have the affinity set to all cpus.  It will get even worse if we have
to support things like virtio_net that have multiple interrupts per
CPU due to the send and receive virtqueues.