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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
* Update the changelog for patch 2 to clarify that it is a cleanup to
make the following patch-3 fix easier



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(-)

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