kernel/tools/testing/selftests/mm/hmm-tests.c, branch linux-rolling-stable

Merge tag 'mm-nonmm-stable-2025-12-06-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2025-12-06T22:01:20Z

Pull non-MM updates from Andrew Morton: - "panic: sys_info: Refactor and fix a potential issue" (Andy Shevchenko) fixes a build issue and does some cleanup in ib/sys_info.c - "Implement mul_u64_u64_div_u64_roundup()" (David Laight) enhances the 64-bit math code on behalf of a PWM driver and beefs up the test module for these library functions - "scripts/gdb/symbols: make BPF debug info available to GDB" (Ilya Leoshkevich) makes BPF symbol names, sizes, and line numbers available to the GDB debugger - "Enable hung_task and lockup cases to dump system info on demand" (Feng Tang) adds a sysctl which can be used to cause additional info dumping when the hung-task and lockup detectors fire - "lib/base64: add generic encoder/decoder, migrate users" (Kuan-Wei Chiu) adds a general base64 encoder/decoder to lib/ and migrates several users away from their private implementations - "rbree: inline rb_first() and rb_last()" (Eric Dumazet) makes TCP a little faster - "liveupdate: Rework KHO for in-kernel users" (Pasha Tatashin) reworks the KEXEC Handover interfaces in preparation for Live Update Orchestrator (LUO), and possibly for other future clients - "kho: simplify state machine and enable dynamic updates" (Pasha Tatashin) increases the flexibility of KEXEC Handover. Also preparation for LUO - "Live Update Orchestrator" (Pasha Tatashin) is a major new feature targeted at cloud environments. Quoting the cover letter: This series introduces the Live Update Orchestrator, a kernel subsystem designed to facilitate live kernel updates using a kexec-based reboot. This capability is critical for cloud environments, allowing hypervisors to be updated with minimal downtime for running virtual machines. LUO achieves this by preserving the state of selected resources, such as memory, devices and their dependencies, across the kernel transition. As a key feature, this series includes support for preserving memfd file descriptors, which allows critical in-memory data, such as guest RAM or any other large memory region, to be maintained in RAM across the kexec reboot. Mike Rappaport merits a mention here, for his extensive review and testing work. - "kexec: reorganize kexec and kdump sysfs" (Sourabh Jain) moves the kexec and kdump sysfs entries from /sys/kernel/ to /sys/kernel/kexec/ and adds back-compatibility symlinks which can hopefully be removed one day - "kho: fixes for vmalloc restoration" (Mike Rapoport) fixes a BUG which was being hit during KHO restoration of vmalloc() regions * tag 'mm-nonmm-stable-2025-12-06-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (139 commits) calibrate: update header inclusion Reinstate "resource: avoid unnecessary lookups in find_next_iomem_res()" vmcoreinfo: track and log recoverable hardware errors kho: fix restoring of contiguous ranges of order-0 pages kho: kho_restore_vmalloc: fix initialization of pages array MAINTAINERS: TPM DEVICE DRIVER: update the W-tag init: replace simple_strtoul with kstrtoul to improve lpj_setup KHO: fix boot failure due to kmemleak access to non-PRESENT pages Documentation/ABI: new kexec and kdump sysfs interface Documentation/ABI: mark old kexec sysfs deprecated kexec: move sysfs entries to /sys/kernel/kexec test_kho: always print restore status kho: free chunks using free_page() instead of kfree() selftests/liveupdate: add kexec test for multiple and empty sessions selftests/liveupdate: add simple kexec-based selftest for LUO selftests/liveupdate: add userspace API selftests docs: add documentation for memfd preservation via LUO mm: memfd_luo: allow preserving memfd liveupdate: luo_file: add private argument to store runtime state mm: shmem: export some functions to internal.h ...

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/hmm-tests: new throughput tests including THP

2025-11-24T23:08:49Z

Add new benchmark style support to test transfer bandwidth for zone device memory operations. Link: https://lkml.kernel.org/r/20251001065707.920170-16-balbirs@nvidia.com Signed-off-by: Balbir Singh Cc: David Hildenbrand Cc: Zi Yan Cc: Joshua Hahn Cc: Rakie Kim Cc: Byungchul Park Cc: Gregory Price Cc: Ying Huang Cc: Alistair Popple Cc: Oscar Salvador Cc: Lorenzo Stoakes Cc: Baolin Wang Cc: "Liam R. Howlett" Cc: Nico Pache Cc: Ryan Roberts Cc: Dev Jain Cc: Barry Song Cc: Lyude Paul Cc: Danilo Krummrich Cc: David Airlie Cc: Simona Vetter Cc: Ralph Campbell Cc: Mika Penttilä Cc: Matthew Brost Cc: Francois Dugast Signed-off-by: Andrew Morton

selftests/mm/hmm-tests: partial unmap, mremap and anon_write tests

2025-11-24T23:08:49Z

Add partial unmap test case which munmaps memory while in the device. Add tests exercising mremap on faulted-in memory (CPU and GPU) at various offsets and verify correctness. Update anon_write_child to read device memory after fork verifying this flow works in the kernel. Both THP and non-THP cases are updated. Link: https://lkml.kernel.org/r/20251001065707.920170-15-balbirs@nvidia.com Signed-off-by: Balbir Singh Signed-off-by: Matthew Brost Cc: David Hildenbrand Cc: Zi Yan Cc: Joshua Hahn Cc: Rakie Kim Cc: Byungchul Park Cc: Gregory Price Cc: Ying Huang Cc: Alistair Popple Cc: Oscar Salvador Cc: Lorenzo Stoakes Cc: Baolin Wang Cc: "Liam R. Howlett" Cc: Nico Pache Cc: Ryan Roberts Cc: Dev Jain Cc: Barry Song Cc: Lyude Paul Cc: Danilo Krummrich Cc: David Airlie Cc: Simona Vetter Cc: Ralph Campbell Cc: Mika Penttilä Cc: Matthew Brost Cc: Francois Dugast Signed-off-by: Andrew Morton

selftests/mm/hmm-tests: new tests for zone device THP migration

2025-11-24T23:08:49Z

Add new tests for migrating anon THP pages, including anon_huge, anon_huge_zero and error cases involving forced splitting of pages during migration. Link: https://lkml.kernel.org/r/20251001065707.920170-14-balbirs@nvidia.com Signed-off-by: Balbir Singh Cc: David Hildenbrand Cc: Zi Yan Cc: Joshua Hahn Cc: Rakie Kim Cc: Byungchul Park Cc: Gregory Price Cc: Ying Huang Cc: Alistair Popple Cc: Oscar Salvador Cc: Lorenzo Stoakes Cc: Baolin Wang Cc: "Liam R. Howlett" Cc: Nico Pache Cc: Ryan Roberts Cc: Dev Jain Cc: Barry Song Cc: Lyude Paul Cc: Danilo Krummrich Cc: David Airlie Cc: Simona Vetter Cc: Ralph Campbell Cc: Mika Penttilä Cc: Matthew Brost Cc: Francois Dugast Signed-off-by: Andrew Morton

selftests/mm: add -Wunreachable-code and fix warnings

2025-09-21T21:22:34Z

Patch series "selftests/mm: Add -Wunreachable-code and fix warnings". Add -Wunreachable-code to selftests and remove dead code from generated warnings. This patch (of 2): Enable -Wunreachable-code flag to catch dead code and fix them. 1. Remove the dead code and write a comment instead: hmm-tests.c:2033:3: warning: code will never be executed [-Wunreachable-code] perror("Should not reach this\n"); ^~~~~~ 2. ksft_exit_fail_msg() calls exit(). So cleanup isn't done. Replace it with ksft_print_msg(). split_huge_page_test.c:301:3: warning: code will never be executed [-Wunreachable-code] goto cleanup; ^~~~~~~~~~~~ 3. Remove duplicate inline. pkey_sighandler_tests.c:44:15: warning: duplicate 'inline' declaration specifier [-Wduplicate-decl-specifier] static inline __always_inline Link: https://lkml.kernel.org/r/20250912123025.1271051-1-usama.anjum@collabora.com Link: https://lkml.kernel.org/r/20250912123025.1271051-2-usama.anjum@collabora.com Signed-off-by: Muhammad Usama Anjum Reviewed-by: Sidhartha Kumar Reviewed-by: Kevin Brodsky Acked-by: David Hildenbrand Reviewed-by: Zi Yan Cc: Baolin Wang Cc: Barry Song Cc: Dev Jain Cc: Jason Gunthorpe Cc: Lance Yang Cc: Leon Romanovsky Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Mariano Pache Cc: Michal Hocko Cc: Mike Rapoport Cc: Ryan Roberts Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton

selftests/mm: fix incorrect buffer->mirror size in hmm2 double_map test

2024-10-09T19:47:19Z

The hmm2 double_map test was failing due to an incorrect buffer->mirror size. The buffer->mirror size was 6, while buffer->ptr size was 6 * PAGE_SIZE. The test failed because the kernel's copy_to_user function was attempting to copy a 6 * PAGE_SIZE buffer to buffer->mirror. Since the size of buffer->mirror was incorrect, copy_to_user failed. This patch corrects the buffer->mirror size to 6 * PAGE_SIZE. Test Result without this patch ============================== # RUN hmm2.hmm2_device_private.double_map ... # hmm-tests.c:1680:double_map:Expected ret (-14) == 0 (0) # double_map: Test terminated by assertion # FAIL hmm2.hmm2_device_private.double_map not ok 53 hmm2.hmm2_device_private.double_map Test Result with this patch =========================== # RUN hmm2.hmm2_device_private.double_map ... # OK hmm2.hmm2_device_private.double_map ok 53 hmm2.hmm2_device_private.double_map Link: https://lkml.kernel.org/r/20240927050752.51066-1-donettom@linux.ibm.com Fixes: fee9f6d1b8df ("mm/hmm/test: add selftests for HMM") Signed-off-by: Donet Tom Reviewed-by: Muhammad Usama Anjum Cc: Jérôme Glisse Cc: Kees Cook Cc: Mark Brown Cc: Przemek Kitszel Cc: Ritesh Harjani (IBM) Cc: Shuah Khan Cc: Ralph Campbell Cc: Jason Gunthorpe Cc: Signed-off-by: Andrew Morton

selftests: avoid using SKIP(exit()) in harness fixure setup

2024-03-06T03:25:36Z

selftest harness uses various exit codes to signal test results. Avoid calling exit() directly, otherwise tests may get broken by harness refactoring (like the commit under Fixes). SKIP() will instruct the harness that the test shouldn't run, it used to not be the case, but that has been fixed. So just return, no need to exit. Note that for hmm-tests this actually changes the result from pass to skip. Which seems fair, the test is skipped, after all. Reported-by: Mark Brown Link: https://lore.kernel.org/all/05f7bf89-04a5-4b65-bf59-c19456aeb1f0@sirena.org.uk Fixes: a724707976b0 ("selftests: kselftest_harness: use KSFT_* exit codes") Reviewed-by: Kees Cook Reviewed-by: Mark Brown Tested-by: Mark Brown Reviewed-by: Przemek Kitszel Link: https://lore.kernel.org/r/20240304233621.646054-1-kuba@kernel.org Signed-off-by: Jakub Kicinski

selftests/mm: FOLL_LONGTERM need to be updated to 0x100

2023-08-21T20:07:21Z

After commit 2c2241081f7d ("mm/gup: move private gup FOLL_ flags to internal.h") FOLL_LONGTERM flag value got updated from 0x10000 to 0x100 at include/linux/mm_types.h. As hmm.hmm_device_private.hmm_gup_test uses FOLL_LONGTERM Updating same here as well. Before this change test goes in an infinite assert loop in hmm.hmm_device_private.hmm_gup_test ========================================================== RUN hmm.hmm_device_private.hmm_gup_test ... hmm-tests.c:1962:hmm_gup_test:Expected HMM_DMIRROR_PROT_WRITE.. ..(2) == m[2] (34) hmm-tests.c:157:hmm_gup_test:Expected ret (-1) == 0 (0) hmm-tests.c:157:hmm_gup_test:Expected ret (-1) == 0 (0) ... ========================================================== Call Trace: ? sched_clock+0xd/0x20 ? __lock_acquire.constprop.0+0x120/0x6c0 ? ktime_get+0x2c/0xd0 ? sched_clock+0xd/0x20 ? local_clock+0x12/0xd0 ? lock_release+0x26e/0x3b0 pin_user_pages_fast+0x4c/0x70 gup_test_ioctl+0x4ff/0xbb0 ? gup_test_ioctl+0x68c/0xbb0 __x64_sys_ioctl+0x99/0xd0 do_syscall_64+0x60/0x90 ? syscall_exit_to_user_mode+0x2a/0x50 ? do_syscall_64+0x6d/0x90 ? syscall_exit_to_user_mode+0x2a/0x50 ? do_syscall_64+0x6d/0x90 ? irqentry_exit_to_user_mode+0xd/0x20 ? irqentry_exit+0x3f/0x50 ? exc_page_fault+0x96/0x200 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f6aaa31aaff After this change test is able to pass successfully. Link: https://lkml.kernel.org/r/20230808124347.79163-1-ayush.jain3@amd.com Fixes: 2c2241081f7d ("mm/gup: move private gup FOLL_ flags to internal.h") Signed-off-by: Ayush Jain Reviewed-by: Raghavendra K T Reviewed-by: John Hubbard Acked-by: David Hildenbrand Cc: Jason Gunthorpe Cc: Signed-off-by: Andrew Morton

selftests/vm: rename selftests/vm to selftests/mm

2023-01-19T01:12:56Z

Rename selftets/vm to selftests/mm for being more consistent with the code, documentation, and tools directories, and won't be confused with virtual machines. [sj@kernel.org: convert missing vm->mm changes] Link: https://lkml.kernel.org/r/20230107230643.252273-1-sj@kernel.org Link: https://lkml.kernel.org/r/20230103180754.129637-5-sj@kernel.org Signed-off-by: SeongJae Park Cc: Jonathan Corbet Cc: Shuah Khan Signed-off-by: Andrew Morton