linux-kernel - [PATCH v3 0/8] mm: Rework hmm to use devm_memremap

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Date:   Mon, 18 Jun 2018 23:04:39 -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 v3 0/8] mm: Rework hmm to use devm_memremap_pages and other
 fixes

Changes since v2 [1]:
* Rebased on v4.18-rc1
* Collect Logan's reviewed-by for "mm, devm_memremap_pages: Add
  MEMORY_DEVICE_PRIVATE support"
* Convert __put_devmap_managed_page and devmap_managed_key to
  EXPORT_SYMBOL otherwise put_page() becomes limited to GPL-only
  modules.
* Clarify some of the changelogs.

[1]: https://lkml.org/lkml/2018/5/23/24

---

Hi Andrew, here's v3 to replace these 5 currently in mm:

mm-devm_memremap_pages-mark-devm_memremap_pages-export_symbol_gpl.patch
mm-devm_memremap_pages-handle-errors-allocating-final-devres-action.patch
mm-hmm-use-devm-semantics-for-hmm_devmem_add-remove.patch
mm-hmm-replace-hmm_devmem_pages_create-with-devm_memremap_pages.patch
mm-hmm-mark-hmm_devmem_add-add_resource-export_symbol_gpl.patch

For maintainability, as ZONE_DEVICE continues to attract new users,
it is useful 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 on the mm.

Patches based on v4.18-rc1 where there are no upstream consumers of the
HMM functionality.

---

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                          |  307 +++++--------------------------------
 tools/testing/nvdimm/test/iomap.c |   21 ++-
 7 files changed, 132 insertions(+), 324 deletions(-)