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    Subject[PATCH v3 0/3] HMM tests and minor fixes
    Date
    These changes are based on Jason's rdma/hmm branch (5.4.0-rc1).
    Patch 1 was previously posted here [1] but was dropped from that orginal
    series. Hopefully, the tests will reduce concerns about edge conditions.
    I'm sure more tests could be usefully added but I thought this was a good
    starting point.

    Changes since v2:
    patch 1:
    Removed hmm_range_needs_fault() and just use hmm_range_need_fault().
    Updated the change log to include that it fixes a bug where
    hmm_range_fault() incorrectly returned an error when no fault is requested.
    patch 2:
    Removed the confusing change log wording about DMA.
    Changed hmm_range_fault() to return the PFN of the zero page like any other
    page.
    patch 3:
    Adjusted the test code to match the new zero page behavior.

    Changes since v1:
    Rebased to Jason's rdma/hmm branch (5.4.0-rc1).
    Cleaned up locking for the test driver's page tables.
    Incorporated Christoph Hellwig's comments.

    [1] https://lore.kernel.org/linux-mm/20190726005650.2566-6-rcampbell@nvidia.com/

    Ralph Campbell (3):
    mm/hmm: make full use of walk_page_range()
    mm/hmm: allow snapshot of the special zero page
    mm/hmm/test: add self tests for HMM

    MAINTAINERS | 3 +
    drivers/char/Kconfig | 11 +
    drivers/char/Makefile | 1 +
    drivers/char/hmm_dmirror.c | 1566 ++++++++++++++++++++++++
    include/Kbuild | 1 +
    include/uapi/linux/hmm_dmirror.h | 74 ++
    mm/hmm.c | 136 +-
    tools/testing/selftests/vm/.gitignore | 1 +
    tools/testing/selftests/vm/Makefile | 3 +
    tools/testing/selftests/vm/config | 3 +
    tools/testing/selftests/vm/hmm-tests.c | 1311 ++++++++++++++++++++
    tools/testing/selftests/vm/run_vmtests | 16 +
    tools/testing/selftests/vm/test_hmm.sh | 97 ++
    13 files changed, 3158 insertions(+), 65 deletions(-)
    create mode 100644 drivers/char/hmm_dmirror.c
    create mode 100644 include/uapi/linux/hmm_dmirror.h
    create mode 100644 tools/testing/selftests/vm/hmm-tests.c
    create mode 100755 tools/testing/selftests/vm/test_hmm.sh

    --
    2.20.1

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