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Sayali Patil 9753df357b selftests/mm: allow PUD-level entries in compound testcase of hmm tests 
[ Upstream commit 224ed0e019 ]

Patch series "selftests/mm: assorted fixes for hmm-tests", v3.

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.

This patch (of 3):

The HMM compound testcase currently assumes only PMD-level mappings and
fails on systems where default_hugepagesz=1G is set, because the region is
then reported by the device at PUD level.

Determine the mapping level (PMD or PUD) the device reports for the first
page of the range and require every page to match that level exactly via
ASSERT_EQ().  This accepts PUD-level mappings while preserving the
expected/observed protection values printed on failure, and rejects a
fragmented mapping that mixes PMD- and PUD-level entries within the same
range (which a per-page OR check would have let pass).

Link: https://lore.kernel.org/20260611034102.1030738-1-aboorvad@linux.ibm.com
Link: https://lore.kernel.org/20260611034102.1030738-2-aboorvad@linux.ibm.com
Fixes: e478425bec ("mm/hmm: add tests for hmm_pfn_to_map_order()")
Signed-off-by: Sayali Patil <sayalip@linux.ibm.com>
Co-developed-by: Aboorva Devarajan <aboorvad@linux.ibm.com>
Signed-off-by: Aboorva Devarajan <aboorvad@linux.ibm.com>
Cc: Alex Sierra <alex.sierra@amd.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Balbir Singh <balbirs@nvidia.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-07-24 15:51:40 +02:00
..
fault-injection docs: fault-injection: convert docs to ReST and rename to *.rst 2019-06-14 14:21:07 -06:00
ktest ktest: Run POST_KTEST hooks on failure and cancellation 2026-06-01 17:35:32 +02:00
kunit kunit: tool: Import missing importlib.abc 2022-02-23 12:03:04 +01:00
nvdimm tools/testing/nvdimm: Use per-DIMM device handle 2026-01-19 13:09:52 +01:00
radix-tree idr: fix idr_alloc() returning an ID out of range 2026-01-19 13:10:02 +01:00
scatterlist Merge branch 'akpm' (patches from Andrew) 2021-09-03 10:08:28 -07:00
selftests selftests/mm: allow PUD-level entries in compound testcase of hmm tests 2026-07-24 15:51:40 +02:00
vsock vsock/test: add a final full barrier after run all tests 2026-02-06 16:41:46 +01:00