[PATCH 7/8] blk-mq: create hctx for each present CPU

[Omar Sandoval]

On Sat, Jun 03, 2017 at 04:04:02PM +0200, Christoph Hellwig wrote:
> Currently we only create hctx for online CPUs, which can lead to a lot
> of churn due to frequent soft offline / online operations.  Instead
> allocate one for each present CPU to avoid this and dramatically simplify
> the code.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>

Oh man, this cleanup is great. Did you run blktests on this? block/008
does a bunch of hotplugging while I/O is running.