Merge branch 'akpm' (patches from Andrew)

Merge small final update from Andrew Morton:

 - DAX feature work: add fsync/msync support

 - kfree cleanup, MAINTAINERS update

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  MAINTAINERS: return arch/sh to maintained state, with new maintainers
  tree wide: use kvfree() than conditional kfree()/vfree()
  dax: never rely on bh.b_dev being set by get_block()
  xfs: call dax_pfn_mkwrite() for DAX fsync/msync
  ext4: call dax_pfn_mkwrite() for DAX fsync/msync
  ext2: call dax_pfn_mkwrite() for DAX fsync/msync
  dax: add support for fsync/sync
  mm: add find_get_entries_tag()
  dax: support dirty DAX entries in radix tree
  pmem: add wb_cache_pmem() to the PMEM API
  dax: fix conversion of holes to PMDs
  dax: fix NULL pointer dereference in __dax_dbg()