[PATCH v3 0/3] selftests/mm: assorted fixes for hmm-tests

[Aboorva Devarajan <aboorvad@linux.ibm.com>]

Hi all,

This series fixes a few issues in hmm-tests that show up when
page-size and huge-page configuration differ from the hardcoded
assumptions the tests were written for (PMD/THP sizing, default
hugepage size, and related cases).

It also includes a fix to exclusive_cow: the test ignored the return
value of fork(), so both parent and child ran the same teardown path.

Changes in v3:
- Rebased onto current mm-new.
- Patch 1: reworked the compound testcase check in response to the
  Shashiko review. Instead of an ASSERT_TRUE() that ORs the PMD and
  PUD cases on every page (which loses the expected/observed values on
  failure and would let a fragmented PMD+PUD mapping pass), determine
  the mapping level once from the first page and then enforce that every
  page matches it exactly with ASSERT_EQ().
- Patch 2: Unchanged from v2.
- Patch 3: No functional change from v2.


v1: https://lore.kernel.org/all/cover.1777870179.git.aboorvad@linux.ibm.com/
v2: https://lore.kernel.org/all/cover.1779090293.git.aboorvad@linux.ibm.com/

Please let us know if you have any comments.

Thanks,
Aboorva

Aboorva Devarajan (1):
  selftests/mm: fix exclusive_cow test fork() handling

Sayali Patil (2):
  selftests/mm: allow PUD-level entries in compound testcase of hmm
    tests
  selftests/mm: remove hardcoded THP sizing assumptions in hmm tests

 tools/testing/selftests/mm/hmm-tests.c | 125 +++++++++++++++++++------
 1 file changed, 95 insertions(+), 30 deletions(-)


base-commit: 801c5efa788952095586d076fed1ea4902facff8
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2.54.0