kernel.git/tools/testing/selftests/mm/pagemap_ioctl.c, branch master

selftests/mm: fix exit code in pagemap_ioctl

2026-01-31T22:22:42Z

Make sure pagemap_ioctl exits with an appropriate value: * If the tests are run, call ksft_finished() to report the right status instead of reporting PASS unconditionally. * Report SKIP if userfaultfd isn't available (in line with other tests) * Report FAIL if we failed to open /proc/self/pagemap, as this file has been added a long time ago and doesn't depend on any CONFIG option (returning -EINVAL from main() is meaningless) Link: https://lkml.kernel.org/r/20260122170224.4056513-9-kevin.brodsky@arm.com Signed-off-by: Kevin Brodsky Reviewed-by: Ryan Roberts Reviewed-by: Mark Brown Acked-by: David Hildenbrand (Red Hat) Acked-by: SeongJae Park Reviewed-by: wang lian Reviewed-by: Dev Jain Cc: Usama Anjum Cc: Jason Gunthorpe Cc: John Hubbard Cc: Lorenzo Stoakes Cc: Paolo Abeni Cc: Shuah Khan Cc: Yunsheng Lin Signed-off-by: Andrew Morton

selftests/mm: fix faulting-in code in pagemap_ioctl test

2026-01-31T22:22:41Z

One of the pagemap_ioctl tests attempts to fault in pages by memcpy()'ing them to an unused buffer. This probably worked originally, but since commit 46036188ea1f ("selftests/mm: build with -O2") the compiler is free to optimise away that unused buffer and the memcpy() with it. As a result there might not be any resident page in the mapping and the test may fail. We don't need to copy all that memory anyway. Just fault in every page. While at it also make sure to compute the number of pages once using simple integer arithmetic instead of ceilf() and implicit conversions. Link: https://lkml.kernel.org/r/20260122170224.4056513-8-kevin.brodsky@arm.com Fixes: 46036188ea1f ("selftests/mm: build with -O2") Signed-off-by: Kevin Brodsky Acked-by: David Hildenbrand (Red Hat) Reviewed-by: Dev Jain Reviewed-by: Muhammad Usama Anjum Cc: Jason Gunthorpe Cc: John Hubbard Cc: Lorenzo Stoakes Cc: Mark Brown Cc: Paolo Abeni Cc: Ryan Roberts Cc: SeongJae Park Cc: Shuah Khan Cc: wang lian Cc: Yunsheng Lin Signed-off-by: Andrew Morton

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: use calloc instead of malloc in pagemap_ioctl.c

2025-09-13T23:55:17Z

As per Documentation/process/deprecated.rst, dynamic size calculations should not be performed in memory allocator arguments due to possible overflows. Replace malloc with calloc to avoid open-ended arithmetic and prevent possible overflows. Link: https://lkml.kernel.org/r/20250825170643.63174-1-viswanathiyyappan@gmail.com Signed-off-by: I Viswanath Reviewed-by: Vishal Moola (Oracle) Acked-by: David Hildenbrand Reviewed by: Donet Tom 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

selftests/mm: fix FORCE_READ to read input value correctly

2025-08-28T05:45:42Z

FORCE_READ() converts input value x to its pointer type then reads from address x. This is wrong. If x is a non-pointer, it would be caught it easily. But all FORCE_READ() callers are trying to read from a pointer and FORCE_READ() basically reads a pointer to a pointer instead of the original typed pointer. Almost no access violation was found, except the one from split_huge_page_test. Fix it by implementing a simplified READ_ONCE() instead. Link: https://lkml.kernel.org/r/20250805175140.241656-1-ziy@nvidia.com Fixes: 3f6bfd4789a0 ("selftests/mm: reuse FORCE_READ to replace "asm volatile("" : "+r" (XXX));"") Signed-off-by: Zi Yan Reviewed-by: Lorenzo Stoakes Acked-by: David Hildenbrand Reviewed-by: wang lian Reviewed-by: Wei Yang Cc: Christian Brauner Cc: Jann Horn Cc: Kairui Song Cc: Liam Howlett Cc: Mark Brown Cc: SeongJae Park Cc: Shuah Khan Cc: Vlastimil Babka Cc: Zi Yan Signed-off-by: Andrew Morton

selftests/mm: reuse FORCE_READ to replace "asm volatile("" : "+r" (XXX));"

2025-07-25T02:12:41Z

Patch series "selftests/mm: reuse FORCE_READ to replace "asm volatile("" : "+r" (XXX));" and some cleanup", v2. This series introduces a common FORCE_READ() macro to replace the cryptic asm volatile("" : "+r" (variable)); construct used in several mm selftests. This improves code readability and maintainability by removing duplicated, hard-to-understand code. This patch (of 2): Several mm selftests use the `asm volatile("" : "+r" (variable));` construct to force a read of a variable, preventing the compiler from optimizing away the memory access. This idiom is cryptic and duplicated across multiple test files. Following a suggestion from David[1], this patch refactors this common pattern into a FORCE_READ() macro Link: https://lkml.kernel.org/r/20250717131857.59909-1-lianux.mm@gmail.com Link: https://lkml.kernel.org/r/20250717131857.59909-2-lianux.mm@gmail.com Link: https://lore.kernel.org/lkml/4a3e0759-caa1-4cfa-bc3f-402593f1eee3@redhat.com/ [1] Signed-off-by: wang lian Reviewed-by: Lorenzo Stoakes Acked-by: David Hildenbrand Reviewed-by: Zi Yan Reviewed-by: Wei Yang Cc: Christian Brauner Cc: Jann Horn Cc: Kairui Song Cc: Liam Howlett Cc: Mark Brown Cc: SeongJae Park Cc: Shuah Khan Cc: Vlastimil Babka Signed-off-by: Andrew Morton

selftests/mm: pagemap_scan ioctl: add PFN ZERO test cases

2025-07-20T01:59:44Z

Add test cases to test the correctness of PFN ZERO flag of pagemap_scan ioctl. Test with normal pages backed memory and huge pages backed memory. Link: https://lkml.kernel.org/r/20250707073321.106431-1-usama.anjum@collabora.com Signed-off-by: Muhammad Usama Anjum Cc: David Hildenbrand Cc: Muhammad Usama Anjum Cc: Shuah Khan Signed-off-by: Andrew Morton

selftests/mm: use long for dwRegionSize

2025-05-13T06:50:37Z

Change the type of 'dwRegionSize' in wp_init() and wp_free() from int to long to match callers that pass long or unsigned long long values. wp_addr_range function is left unchanged because it passes 'dwRegionSize' parameter directly to pagemap_ioctl, which expects an int. This patch does not fix any actual known issues. It aligns parameter types with their actual usage and avoids any potential future issues. Link: https://lkml.kernel.org/r/20250427102639.39978-1-siddarthsgml@gmail.com Signed-off-by: Siddarth G Cc: Shuah Khan Signed-off-by: Andrew Morton

selftests/mm: convert page_size to unsigned long

2025-05-12T00:48:09Z

Cppcheck warning: int result is assigned to long long variable. If the variable is long long to avoid loss of information, then you have loss of information. This patch changes the type of page_size from 'unsigned int' to 'unsigned long' instead of using ULL suffixes. Changing hpage_size to 'unsigned long' was considered, but since gethugepage() expects an int, this change was avoided. Link: https://lkml.kernel.org/r/20250403101345.29226-1-siddarthsgml@gmail.com Signed-off-by: Siddarth G Reported-by: David Binderman Closes: https://lore.kernel.org/all/AS8PR02MB10217315060BBFDB21F19643E9CA62@AS8PR02MB10217.eurprd02.prod.outlook.com/ Signed-off-by: Andrew Morton

selftests/mm: pagemap_ioctl: Fix types mismatches shown by compiler options

2025-01-14T06:40:52Z

Fix following warnings caught by compiler: - There are several type mismatches among different variables. - Remove unused variable warnings. Link: https://lkml.kernel.org/r/20241209185624.2245158-3-usama.anjum@collabora.com Signed-off-by: Muhammad Usama Anjum Signed-off-by: Andrew Morton