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