Merge branch 'akpm' (fixes from Andrew Morton)

Merge four more fixes from Andrew Morton.

* emailed patches from Andrew Morton <[email protected]>:
  lib/scatterlist.c: don't flush_kernel_dcache_page on slab page
  mm: memcg: fix test for child groups
  mm: memcg: lockdep annotation for memcg OOM lock
  mm: memcg: use proper memcg in limit bypass