[PATCH 0/5] device-dax and huge-page dax fixes for 4.8-rc6

[Dan Williams]

Kai and Toshi reported poor performance with huge-page dax mappings and
while debugging a few more bugs were discovered in the device-dax driver
and mm.  The following fixes target 4.8-rc6 and are tagged for -stable:

- device-dax incorrectly translates the file offset to a physical
  resource address

- show_smap() crashes on huge-page dax mappings

- huge-page dax mappings are inadvertently being marked as
  _PAGE_CACHE_MODE_UC instead of _PAGE_CACHE_MODE_WB

I would like to take this set through nvdimm.git with acks from mm folks
as there is 4.9 device-dax development that depends on these changes.

---

Dan Williams (5):
      dax: fix mapping size check
      dax: fix offset to physical address translation
      mm: fix show_smap() for zone_device-pmd ranges
      mm: fix cache mode of dax pmd mappings
      mm: cleanup pfn_t usage in track_pfn_insert()


 arch/x86/mm/pat.c             |    4 ++--
 drivers/dax/dax.c             |   12 +++++++-----
 fs/proc/task_mmu.c            |    2 ++
 include/asm-generic/pgtable.h |    4 ++--
 mm/huge_memory.c              |    6 ++----
 mm/memory.c                   |    2 +-
 6 files changed, 16 insertions(+), 14 deletions(-)