kernel/tools/testing/selftests/mm/uffd-wp-mremap.c, branch linux-rolling-stable

selftests: complete kselftest include centralization

2025-11-27T22:24:31Z

This follow-up patch completes centralization of kselftest.h and ksefltest_harness.h includes in remaining seltests files, replacing all relative paths with a non-relative paths using shared -I include path in lib.mk Tested with gcc-13.3 and clang-18.1, and cross-compiled successfully on riscv, arm64, x86_64 and powerpc arch. [reddybalavignesh9979@gmail.com: add selftests include path for kselftest.h] Link: https://lkml.kernel.org/r/20251017090201.317521-1-reddybalavignesh9979@gmail.com Link: https://lkml.kernel.org/r/20251016104409.68985-1-reddybalavignesh9979@gmail.com Signed-off-by: Bala-Vignesh-Reddy Suggested-by: Andrew Morton Link: https://lore.kernel.org/lkml/20250820143954.33d95635e504e94df01930d0@linux-foundation.org/ Reviewed-by: Wei Yang Cc: David Hildenbrand Cc: David S. Miller Cc: Eric Dumazet Cc: Günther Noack Cc: Jakub Kacinski Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mickael Salaun Cc: Ming Lei Cc: Paolo Abeni Cc: Shuah Khan Cc: Simon Horman Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton

selftests/mm/uffd: refactor non-composite global vars into struct

2025-09-21T21:21:59Z

Refactor macros and non-composite global variable definitions into a struct that is defined at the start of a test and is passed around instead of relying on global vars. Link: https://lkml.kernel.org/r/20250829155600.2000-1-ujwal.kundur@gmail.com Signed-off-by: Ujwal Kundur Acked-by: Peter Xu Reviewed-by: Brendan Jackman Cc: David Hildenbrand Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton

selftest/mm: extract sz2ord function into vm_util.h

2025-09-13T23:55:06Z

The function already has 2 uses and will have a 3rd one in prctl selftests. The pagesize argument is added into the function, as it's not a global variable anymore. No functional change intended with this patch. Link: https://lkml.kernel.org/r/20250815135549.130506-6-usamaarif642@gmail.com Suggested-by: David Hildenbrand Signed-off-by: Usama Arif Reviewed-by: Lorenzo Stoakes Reviewed-by: Zi Yan Cc: Arnd Bergmann Cc: Baolin Wang Cc: Barry Song Cc: Dev Jain Cc: Jann Horn Cc: Johannes Weiner Cc: Jonathan Corbet Cc: Liam Howlett Cc: Mariano Pache Cc: Michal Hocko Cc: Mike Rapoport Cc: Rik van Riel Cc: Ryan Roberts Cc: SeongJae Park Cc: Shakeel Butt Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Yafang Signed-off-by: Andrew Morton

mm/selftests: fix split_huge_page_test failure on systems with 64KB page size

2025-09-13T23:55:03Z

The split_huge_page_test fails on systems with a 64KB base page size. This is because the order of a 2MB huge page is different: On 64KB systems, the order is 5. On 4KB systems, it's 9. The test currently assumes a maximum huge page order of 9, which is only valid for 4KB base page systems. On systems with 64KB pages, attempting to split huge pages beyond their actual order (5) causes the test to fail. In this patch, we calculate the huge page order based on the system's base page size. With this change, the tests now run successfully on both 64KB and 4KB page size systems. Link: https://lkml.kernel.org/r/20250816040113.760010-5-aboorvad@linux.ibm.com Fixes: fa6c02315f74 ("mm: huge_memory: a new debugfs interface for splitting THP tests") Co-developed-by: Aboorva Devarajan Signed-off-by: Aboorva Devarajan Signed-off-by: Donet Tom Reviewed-by: Dev Jain Reviewed-by: Zi Yan Reviewed-by: Wei Yang Cc: Baolin Wang Cc: Barry Song Cc: David Hildenbrand Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Mariano Pache Cc: "Ritesh Harjani (IBM)" Cc: Ryan Roberts Cc: Shuah Khan Signed-off-by: Andrew Morton

selftests/mm: skip uffd-wp-mremap if userfaultfd not available

2025-03-17T05:06:38Z

It's obvious that this should fail in that case, but still, save the reader the effort of figuring out that they've run into this by just SKIPping Link: https://lkml.kernel.org/r/20250311-mm-selftests-v4-3-dec210a658f5@google.com Signed-off-by: Brendan Jackman Reviewed-by: Dev Jain Cc: Lorenzo Stoakes Cc: Mateusz Guzik Cc: Shuah Khan Signed-off-by: Andrew Morton

selftests/mm: introduce uffd-wp-mremap regression test

2025-01-26T04:22:31Z

Introduce a test that registers a range of memory for UFFDIO_WRITEPROTECT_MODE_WP without UFFD_FEATURE_EVENT_REMAP. First check that the uffd-wp bit is set for every PTE in the range. Then mremap() the range to a new location and check that the uffd-wp bit is clear for every PTE in the range. Run the test for small folios, all supported THP sizes and all supported hugetlb sizes, and for swapped out memory, shared and private. There was previously a bug in the kernel where the uffd-wp bits remained set in all PTEs for this case, after fixing the kernel, the tests all pass. Link: https://lkml.kernel.org/r/20250107144755.1871363-3-ryan.roberts@arm.com Signed-off-by: Ryan Roberts Cc: David Hildenbrand Cc: Jann Horn Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Mark Rutland Cc: Muchun Song Cc: Peter Xu Cc: Shuah Khan Cc: Vlastimil Babka Signed-off-by: Andrew Morton