linux-kernel - [PATCH v4 0/8] mm: Rework hmm to use devm_memremap

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Date:   Tue, 10 Jul 2018 22:14:37 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     akpm@...ux-foundation.org
Cc:     stable@...r.kernel.org, Logan Gunthorpe <logang@...tatee.com>,
        Christoph Hellwig <hch@....de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        John Hubbard <jhubbard@...dia.com>,
        Joe Gorse <jhgorse@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/8] mm: Rework hmm to use devm_memremap_pages and other
 fixes

Changes since v3 [1]:
* Collect Logan's reviewed-by on patch 3
* Collect John's and Joe's tested-by on patch 8
* Update the changelog for patch 1 and 7 to better explain the
  EXPORT_SYMBOL_GPL rationale.
* Update the changelog for patch 2 to clarify that it is a cleanup to
  make the following patch-3 fix easier

[1]: https://lkml.org/lkml/2018/6/19/108

---

Hi Andrew,

As requested, here is a resend of the devm_memremap_pages() fixups.
Please consider for 4.18.

---

As ZONE_DEVICE continues to attract new users, it is imperative to keep
all users consolidated on devm_memremap_pages() as the interface for
create "device pages".

The devm_memremap_pages() implementation was recently reworked to make
it more generic for arbitrary users, like the proposed peer-to-peer
PCI-E enabling. HMM pre-dated this rework and opted to duplicate
devm_memremap_pages() as hmm_devmem_pages_create().

Rework hmm to be a consumer of devm_memremap_pages() directly and fix up
the licensing on the exports given the deep dependencies and exposure of
core mm internals.

With the exports of devm_memremap_pages() and hmm fixed up we can fix
the regression of inadvertently making put_page() have EXPORT_SYMBOL_GPL
dependencies, which breaks consumers like OpenAFS.

The series was tested against v4.18-rc2.

---

Dan Williams (8):
      mm, devm_memremap_pages: Mark devm_memremap_pages() EXPORT_SYMBOL_GPL
      mm, devm_memremap_pages: Kill mapping "System RAM" support
      mm, devm_memremap_pages: Fix shutdown handling
      mm, devm_memremap_pages: Add MEMORY_DEVICE_PRIVATE support
      mm, hmm: Use devm semantics for hmm_devmem_{add,remove}
      mm, hmm: Replace hmm_devmem_pages_create() with devm_memremap_pages()
      mm, hmm: Mark hmm_devmem_{add,add_resource} EXPORT_SYMBOL_GPL
      mm: Fix exports that inadvertently make put_page() EXPORT_SYMBOL_GPL

 drivers/dax/pmem.c                |   10 -
 drivers/nvdimm/pmem.c             |   18 +-
 include/linux/hmm.h               |    4 
 include/linux/memremap.h          |    7 +
 kernel/memremap.c                 |   89 +++++++----
 mm/hmm.c                          |  306 +++++--------------------------------
 tools/testing/nvdimm/test/iomap.c |   21 ++-
 7 files changed, 132 insertions(+), 323 deletions(-)