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Date:	Tue,  6 Oct 2015 16:28:47 -0600
From:	Ross Zwisler <>
Cc:	Ross Zwisler <>,
	Alexander Viro <>,
	Matthew Wilcox <>,,,
	Andrew Morton <>,
	Dan Williams <>,
	Dave Chinner <>, Jan Kara <>,
	"Kirill A. Shutemov" <>,,
	Matthew Wilcox <>
Subject: [PATCH v4 0/2] Revert locking changes in DAX for v4.3

This series reverts 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 v3:
 - reduced the revert of 46c043ede471 in patch 1 so that we still drop the
   mapping->i_mmap_rwsem before calling unmap_mapping_range().  This prevents
   the deadlock in the __dax_pmd_fault() path so there is no longer a need to
   temporarily disable DAX PMD faults.

Ross Zwisler (2):
  Revert "mm: take i_mmap_lock in unmap_mapping_range() for DAX"
  Revert "dax: fix race between simultaneous faults"

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


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