Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:
 "15 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  ocfs2/dlm: fix deadlock when dispatch assert master
  membarrier: clean up selftest
  vmscan: fix sane_reclaim helper for legacy memcg
  lib/iommu-common.c: do not try to deref a null iommu->lazy_flush() pointer when n < pool->hint
  x86, efi, kasan: #undef memset/memcpy/memmove per arch
  mm: migrate: hugetlb: putback destination hugepage to active list
  mm, dax: VMA with vm_ops->pfn_mkwrite wants to be write-notified
  userfaultfd: register uapi generic syscall (aarch64)
  userfaultfd: selftest: don't error out if pthread_mutex_t isn't identical
  userfaultfd: selftest: return an error if BOUNCE_VERIFY fails
  userfaultfd: selftest: avoid my_bcmp false positives with powerpc
  userfaultfd: selftest: only warn if __NR_userfaultfd is undefined
  userfaultfd: selftest: headers fixup
  userfaultfd: selftests: vm: pick up sanitized kernel headers
  userfaultfd: revert "userfaultfd: waitqueue: add nr wake parameter to __wake_up_locked_key"

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