[PATCH v2 0/3] selftests/mm: TAP output and global-state fixes

uffd-wp-mremap and mremap_test never print the TAP header (and mremap_test
skips with a bare exit(KSFT_SKIP) rather than a KTAP skip), so their output
is not valid KTAP; hugetlb-soft-offline toggles enable_soft_offline during
the run and leaves it disabled afterwards.

Tested on x86_64.

Song Hu (3):
  selftests/mm: emit TAP header in uffd-wp-mremap
  selftests/mm: emit TAP header and use TAP skip in mremap_test
  selftests/mm: restore enable_soft_offline in hugetlb-soft-offline

 .../selftests/mm/hugetlb-soft-offline.c       | 35 ++++++----------
 tools/testing/selftests/mm/mremap_test.c      | 41 +++++++++++--------
 tools/testing/selftests/mm/uffd-wp-mremap.c   |  2 +
 3 files changed, 37 insertions(+), 41 deletions(-)

---

Changes in v2, per review feedback from Mike Rapoport, Sarthak Sharma and
the Sashiko AI review Andrew Morton pointed at:

- mremap_test: save errno before fclose() in get_mmap_min_addr() so
  strerror() reports the actual failure, and split the ksft_*() messages
  embedding "\n\t" so continuation lines get the "# " prefix.

- hugetlb-soft-offline: restore enable_soft_offline from an atexit()
  handler so it also runs on early exits, and use read_num()/write_num()
  from vm_util instead of the hand-rolled helpers.

v1: https://lore.kernel.org/all/[email protected]/

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2.43.0