[PATCH 2/7] nvme: switch AEN processing to use blk_execute_rq_nowait

[Keith Busch]

On Thu, 24 Sep 2015, Christoph Hellwig wrote:
> Unfortunately we really need to keep the struct request around to
> avoid special casing AENs in the completion path.
>
> Yigal, is there a nice easy way to trigger the CPU hotplug migration
> through sysfs or another userspace interface?  I think I can solve
> this without freeing the AEN early with a little more thought.

To take a cpu offline and trigger a removal:

   echo 0 > /sys/devices/system/cpu/cpu1/online