[PATCH v2 0/2] fix cache mode tracking for pmem + dax

[Dan Williams]

While writing an improved changelog, as prompted by Andrew, for v1 of
"mm: fix cache mode of dax pmd mappings" [1], it struck me that
vmf_insert_pfn_pmd() is implemented correctly.  Instead, it is the
memtype tree that is missing a memtype reservation for
devm_memremap_pages() ranges.

vmf_insert_pfn_pmd() is correct to validate the memtype before inserting
a mapping, but this highlights that vm_insert_mixed() is missing this
validation.

I would still like to take patch 1 through the nvdimm.git tree, with -mm
acks, along with the device-dax fixes for v4.8-rc6.  Patch 2 can go the
typical -mm route for v4.9 since it has potential to change behavior in
its DRI usages, needs soak time in -next, and there no known memtype
conflict problems it would fix.

[1]: https://lists.01.org/pipermail/linux-nvdimm/2016-September/006781.html

---

Dan Williams (2):
      mm: fix cache mode of dax pmd mappings
      mm: fix cache mode tracking in vm_insert_mixed()


 arch/x86/mm/pat.c |   17 ++++++++++-------
 kernel/memremap.c |    9 +++++++++
 mm/memory.c       |    8 ++++++--
 3 files changed, 25 insertions(+), 9 deletions(-)