linux-kernel - [PATCH v3 0/3] Revert locking changes in DAX for v4.3

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Date:	Mon,  5 Oct 2015 14:32:51 -0600
From:	Ross Zwisler <ross.zwisler@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Cc:	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Matthew Wilcox <willy@...ux.intel.com>,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	linux-nvdimm@...ts.01.org
Subject: [PATCH v3 0/3]  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")

It also temporarily disables the newly added DAX PMD fault path because of a
deadlock. We are re-working the way that DAX does its locking for v4.4, so for
now just disable DAX PMD faults and fall back to PAGE_SIZE faults to make sure
we don't hit this deadlock.

Changes from v2:
 - Temporarily disable the DAX PMD fault path while we re-work DAX locking for
   v4.4.

Ross Zwisler (3):
  Revert "mm: take i_mmap_lock in unmap_mapping_range() for DAX"
  Revert "dax: fix race between simultaneous faults"
  dax: temporarily disable DAX PMD fault path

 fs/dax.c    | 90 ++++++++++++++++++++++++++++---------------------------------
 mm/memory.c |  2 ++
 2 files changed, 43 insertions(+), 49 deletions(-)

-- 
2.1.0

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