Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:
 "7 patches.

  Subsystems affected by this patch series: lib, ocfs2, and mm (slub,
  migration, and memcg)"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  mm/memcg: fix NULL pointer dereference in memcg_slab_free_hook()
  slub: fix unreclaimable slab stat for bulk free
  mm/migrate: fix NR_ISOLATED corruption on 64-bit
  mm: memcontrol: fix blocking rstat function called from atomic cgroup1 thresholding code
  ocfs2: issue zeroout to EOF blocks
  ocfs2: fix zero out valid data
  lib/test_string.c: move string selftest in the Runtime Testing menu