Merge branch 'akpm' (patches from Andrew)

Merge more fixes from Andrew Morton:
 "5 fixes"

* emailed patches from Andrew Morton <[email protected]>:
  swap_readpage(): avoid blk_wake_io_task() if !synchronous
  devres: allow const resource arguments
  mm/vmscan.c: prevent useless kswapd loops
  fs/userfaultfd.c: disable irqs for fault_pending and event locks
  mm/page_alloc.c: fix regression with deferred struct page init