[PATCH v5] Fix DAX deadlocks for v4.3

[Ross Zwisler]

This was previously "Revert locking changes in DAX for v4.3".

Undo some recent changes to the locking scheme in DAX introduced by these two
commits:

commit 843172978bb9 ("dax: fix race between simultaneous faults")
commit 46c043ede471 ("mm: take i_mmap_lock in unmap_mapping_range() for DAX")

Changes from v4:
 - Collapsed two revert commits into a single fix commit.  No code changes were
   made.

Ross Zwisler (1):
  mm, dax: fix DAX deadlocks

 fs/dax.c    | 70 +++++++++++++++++++++++++------------------------------------
 mm/memory.c |  2 ++
 2 files changed, 31 insertions(+), 41 deletions(-)

-- 
2.1.0

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