[PATCH v2 00/13] selftests/mm: fix failures and robustness improvements

Sayali Patil
2026-03-12T12:26:14Z

Hi all,

Powerpc systems with a 64K base page size exposed several issues while
running mm selftests. Some tests assume specific hugetlb configurations,
use incorrect interfaces, or fail instead of skipping when the required
kernel features are not available.

This series fixes these issues and improves test robustness.

Please review the patches and provide any feedback or suggestions for
improvement.

Thanks,
Sayali

---
v1->v2
- For "selftests/mm: ensure destination is hugetlb-backed in hugepage-mremap":
update FLAGS definition to MAP_HUGETLB | MAP_SHARED | MAP_POPULATE and
used it for mmap() calls as suggested during review.

v1: https://lore.kernel.org/all/cover.1773134177.git.sayalip@linux.ibm.com/
---

Sayali Patil (13):
selftests/mm: restore default nr_hugepages value during cleanup in
charge_reserved_hugetlb.sh
selftests/mm: fix hugetlb pathname construction in
charge_reserved_hugetlb.sh
selftests/mm: fix hugetlb pathname construction in
hugetlb_reparenting_test.sh
selftest/mm: fix cgroup task placement and tolerance in
hugetlb_reparenting_test.sh
selftests/mm: size tmpfs according to PMD page size in
split_huge_page_test
selftest/mm: adjust hugepage-mremap test size for large huge pages
selftest/mm: register existing mapping with userfaultfd in
hugepage-mremap
selftests/mm: ensure destination is hugetlb-backed in hugepage-mremap
selftests/mm: skip uffd-wp-mremap if UFFD write-protect is unsupported
selftests/mm: skip uffd-stress test when nr_pages_per_cpu is zero
selftests/mm: fix double increment in linked list cleanup in
compaction_test
selftests/mm: move hwpoison setup into run_test() and silence modprobe
output for memory-failure category
selftests/cgroup: extend test_hugetlb_memcg.c to support all huge page
sizes

.../selftests/cgroup/test_hugetlb_memcg.c | 66 ++++++++++++++-----
.../selftests/mm/charge_reserved_hugetlb.sh | 44 +++++++++----
tools/testing/selftests/mm/compaction_test.c | 3 -
tools/testing/selftests/mm/hugepage-mremap.c | 32 +++------
.../selftests/mm/hugetlb_reparenting_test.sh | 31 +++++----
tools/testing/selftests/mm/run_vmtests.sh | 59 +++++++++++------
.../selftests/mm/split_huge_page_test.c | 5 +-
tools/testing/selftests/mm/uffd-stress.c | 6 +-
tools/testing/selftests/mm/uffd-wp-mremap.c | 13 ++++
.../testing/selftests/mm/write_to_hugetlbfs.c | 5 +-
10 files changed, 171 insertions(+), 93 deletions(-)

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2.52.0