Pull XArray updates from Matthew Wilcox:
 "This pull request changes the xa_alloc() API. I'm only aware of one
  subsystem that has started trying to use it, and we agree on the fixup
  as part of the merge.

  The xa_insert() error code also changed to match xa_alloc() (EEXIST to
  EBUSY), and I added xa_alloc_cyclic(). Beyond that, the usual
  bugfixes, optimisations and tweaking.

  I now have a git tree with all users of the radix tree and IDR
  converted over to the XArray that I'll be feeding to maintainers over
  the next few weeks"

* tag 'xarray-5.1-rc1' of git://git.infradead.org/users/willy/linux-dax:
  XArray: Fix xa_reserve for 2-byte aligned entries
  XArray: Fix xa_erase of 2-byte aligned entries
  XArray: Use xa_cmpxchg to implement xa_reserve
  XArray: Fix xa_release in allocating arrays
  XArray: Mark xa_insert and xa_reserve as must_check
  XArray: Add cyclic allocation
  XArray: Redesign xa_alloc API
  XArray: Add support for 1s-based allocation
  XArray: Change xa_insert to return -EBUSY
  XArray: Update xa_erase family descriptions
  XArray tests: RCU lock prohibits GFP_KERNEL