Pull block fixes from Jens Axboe:
 "A smaller collection of fixes that should go into -rc1. This contains:

   - A fix from Christoph, fixing a regression with the WRITE_SAME and
     partial completions. Caused a BUG() on ppc.

   - Fixup for __blk_mq_stop_hw_queues(), it should be static. From
     Colin.

   - Removal of dmesg error messages on elevator switching, when invoked
     from sysfs. From me.

   - Fix for blk-stat, using this_cpu_ptr() in a section only protected
     by rcu_read_lock(). This breaks when PREEMPT_RCU is enabled. From
     me.

   - Two fixes for BFQ from Paolo, one fixing a crash and one updating
     the documentation.

   - An error handling lightnvm memory leak, from Rakesh.

   - The previous blk-mq hot unplug lock reversal depends on the CPU
     hotplug rework that isn't in mainline yet. This caused a lockdep
     splat when people unplugged CPUs with blk-mq devices. From Wanpeng.

   - A regression fix for DIF/DIX on blk-mq. From Wen"

* 'for-linus' of git://git.kernel.dk/linux-block:
  block: handle partial completions for special payload requests
  blk-mq: NVMe 512B/4K+T10 DIF/DIX format returns I/O error on dd with split op
  blk-stat: don't use this_cpu_ptr() in a preemptable section
  elevator: remove redundant warnings on IO scheduler switch
  block, bfq: stress that low_latency must be off to get max throughput
  block, bfq: use pointer entity->sched_data only if set
  nvme: lightnvm: fix memory leak
  blk-mq: make __blk_mq_stop_hw_queues static
  lightnvm: remove unused rq parameter of nvme_nvm_rqtocmd() to kill warning
  block/mq: fix potential deadlock during cpu hotplug