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Subject[PATCH v2 0/7] mm: Rework hmm to use devm_memremap_pages
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Date
Changes since v1: [1]
* Kill support for mapping System RAM as a nop. No one uses this
functionality and it is broken relative to percpu_ref management.

* Fix percpu_ref teardown. Given that devm_memremap_pages() has strict
assumptions about when the percpu_ref is killed, give it
responsibility to make the live-dead transition explicitly. (Logan)

* Split the patch that adds HMM support to devm_memremap_pages() from
the patch that converts HMM to use devm_memremap_pages(). This caught
an incomplete conversion in v1. (Logan)

* Collect Christoph's reviewed-by.

[1]: https://lkml.org/lkml/2018/5/21/1109

---

Hi Andrew, here's v2 to replace the 5 currently in mm. The first and
last patch did not change.

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 v4.17-rc6 where there are no upstream consumers of the
HMM functionality.

---

Dan Williams (7):
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


Documentation/vm/hmm.txt | 1
drivers/dax/pmem.c | 10 -
drivers/nvdimm/pmem.c | 18 +-
include/linux/hmm.h | 4
include/linux/memremap.h | 7 +
kernel/memremap.c | 85 +++++++---
mm/hmm.c | 307 +++++--------------------------------
tools/testing/nvdimm/test/iomap.c | 21 ++-
8 files changed, 130 insertions(+), 323 deletions(-)

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