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

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Date:   Wed, 07 Sep 2016 15:26:08 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     linux-nvdimm@...ts.01.org
Cc:     Toshi Kani <toshi.kani@....com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        David Airlie <airlied@...ux.ie>,
        Nilesh Choudhury <nilesh.choudhury@...cle.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux-mm@...ck.org, dri-devel@...ts.freedesktop.org,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        akpm@...ux-foundation.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Kai Zhang <kai.ka.zhang@...cle.com>
Subject: [PATCH v2 0/2] fix cache mode tracking for pmem + dax

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(-)