[PATCH 4/7] blk-mq: allow the driver to pass in an affinity mask

[Keith Busch]

On Thu, Sep 01, 2016 at 10:46:24AM +0200, Christoph Hellwig wrote:
> On Wed, Aug 31, 2016 at 12:38:53PM -0400, Keith Busch wrote:
> > This can't be right. We have a single affinity mask for the entire
> > set, but what I think we want is an one affinity mask for each
> > nr_io_queues. The irq_create_affinity_mask should then create an array
> > of cpumasks based on nr_vecs..
> 
> Nah, this is Thomas' creating abuse of the cpumask type.  Every bit set
> in the affinity_mask means this is a cpu we allocate a vector / queue to.

Yeah, I gathered that's what it was providing, but that's just barely
not enough information to do something useful. The CPUs that aren't set
have to use a previously assigned vector/queue, but which one?