This series adds basic self tests for HMM and mmu interval notifiers so that changes can be validated. It is based on linux-5.5.0-rc1 and is for Jason's rdma/hmm tree since I believe he is planning some interval notifier changes. Patch 2 was last posted as part of [1] but the other patches in that series have been merged and this version of the HMM tests is modified to address Jason's concern over using both process wide MMU notifiers in combination with MMU interval notifiers. Therefore, patch 1 adds some core functionality to allow intervals to be updated from within the invalidation() callback so that MMU_NOTIFY_UNMAP events can update the range being tracked.

[1] https://lore.kernel.org/linux-mm/20191104222141.5173-1-rcampbell@nvidia.com

Ralph Campbell (2): mm/mmu_notifier: make interval notifier updates safe mm/hmm/test: add self tests for HMM

MAINTAINERS | 3 + include/linux/mmu_notifier.h | 15 + lib/Kconfig.debug | 11 + lib/Makefile | 1 + lib/test_hmm.c | 1367 ++++++++++++++++++++++++ mm/mmu_notifier.c | 196 +++- tools/testing/selftests/vm/.gitignore | 1 + tools/testing/selftests/vm/Makefile | 3 + tools/testing/selftests/vm/config | 2 + tools/testing/selftests/vm/hmm-tests.c | 1360 +++++++++++++++++++++++ tools/testing/selftests/vm/run_vmtests | 16 + tools/testing/selftests/vm/test_hmm.sh | 97 ++ 12 files changed, 3047 insertions(+), 25 deletions(-) create mode 100644 lib/test_hmm.c create mode 100644 tools/testing/selftests/vm/hmm-tests.c create mode 100755 tools/testing/selftests/vm/test_hmm.sh