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