kernel/tools/testing/selftests/cgroup/test_kmem.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/cgroup: conform test to KTAP format output

2025-11-14T18:12:57Z

Conform the layout, informational and status messages to KTAP. No functional change is intended other than the layout of output messages. Signed-off-by: Guopeng Zhang Suggested-by: Sebastian Chlad Acked-by: Michal Koutný Signed-off-by: Tejun Heo

selftests: cgroup: Allow longer timeout for kmem_dead_cgroups cleanup

2025-07-12T17:34:49Z

The test_kmem_dead_cgroups test currently assumes that RCU and memory reclaim will complete within 5 seconds. In some environments this timeout may be insufficient, leading to spurious test failures. This patch introduces max_time set to 20 which is then used in the test. After 5th sec the debug message is printed to indicate the cleanup is still ongoing. In the system under test with 16 CPUs the original test was failing most of the time and the cleanup time took usually approx. 6sec. Further tests were conducted with and without do_rcu_barrier and the results (respectively) are as follow: quantiles 0 0.25 0.5 0.75 1 1 2 3 8 20 (mean = 4.7667) 3 5 8 8 20 (mean = 7.6667) Acked-by: Michal Koutny Signed-off-by: Sebastian Chlad Signed-off-by: Tejun Heo

Revert "selftests/cgroup: Drop define _GNU_SOURCE"

2024-05-20T15:00:15Z

This reverts commit c1457d9aad5ee2feafcf85aa9a58ab50500159d2. The framework change to add D_GNU_SOURCE to KHDR_INCLUDES to Makefile, lib.mk, and kselftest_harness.h is reverted as it is causing build failures and warnings. Revert this change as this change depends on the framework change. Reported-by: Mark Brown Signed-off-by: Shuah Khan

selftests/cgroup: Drop define _GNU_SOURCE

2024-05-13T17:02:36Z

_GNU_SOURCE is provided by lib.mk, so it should be dropped to prevent redefinition warnings. Signed-off-by: Edward Liaw Signed-off-by: Tejun Heo

selftests/cgroup: fix clang build failures for abs() calls

2024-05-03T19:06:09Z

First of all, in order to build with clang at all, one must first apply Valentin Obst's build fix for LLVM [1]. Once that is done, then when building with clang, via: make LLVM=1 -C tools/testing/selftests ...clang is pickier than gcc, about which version of abs(3) to call, depending on the argument type: int abs(int j); long labs(long j); long long llabs(long long j); ...and this is causing both build failures and warnings, when running: make LLVM=1 -C tools/testing/selftests Fix this by calling labs() in value_close(), because the arguments are unambiguously "long" type. [1] https://lore.kernel.org/all/20240329-selftests-libmk-llvm-rfc-v1-1-2f9ed7d1c49f@valentinobst.de/ Signed-off-by: John Hubbard Reviewed-by: Roman Gushchin Signed-off-by: Tejun Heo

selftests: cgroup: skip test_cgcore_lesser_ns_open when cgroup2 mounted without nsdelegate

2024-04-03T19:42:13Z

The test case test_cgcore_lesser_ns_open only tasks effect when cgroup2 is mounted with "nsdelegate" mount option. If it misses this option, or is remounted without "nsdelegate", the test case will fail. For example, running bpf/test_cgroup_storage first, and then run cgroup/test_core will fail on test_cgcore_lesser_ns_open. Skip it if "nsdelegate" is not detected in cgroup2 mount options. Fixes: bf35a7879f1d ("selftests: cgroup: Test open-time cgroup namespace usage for migration checks") Signed-off-by: Tianchen Ding Reviewed-by: Muhammad Usama Anjum Signed-off-by: Tejun Heo

selftests: cgroup: fix test_kmem_memcg_deletion kernel mem check

2023-08-24T23:20:27Z

Currently, not all kernel memory usage is being accounted for. This commit switches to using the kernel entry within memory.stat which already includes kernel_stack, pagetables, and slab. The kernel entry also includes vmalloc and other additional kernel memory use cases which were missing. Link: https://lkml.kernel.org/r/bvrhe2tpsts2azaroq4ubp2slawmop6orndsswrewuscw3ugvk@kmemmrttsnc7 Signed-off-by: Lucas Karpinski Acked-by: Shakeel Butt Acked-by: Roman Gushchin Cc: Johannes Weiner Cc: Michal Hocko Cc: Muchun Song Cc: Shuah Khan Cc: Tejun Heo Cc: Zefan Li Signed-off-by: Andrew Morton

selftests: cgroup: fix test_kmem_basic less than error

2023-08-21T20:07:21Z

test_kmem_basic creates 100,000 negative dentries, with each one mapping to a slab object. After memory.high is set, these are reclaimed through the shrink_slab function call which reclaims all 100,000 entries. The test passes the majority of the time because when slab1 or current is calculated, it is often above 0, however, 0 is also an acceptable value. Link: https://lkml.kernel.org/r/7d6gcuyzdjcice6qbphrmpmv5skr5jtglg375unnjxqhstvhxc@qkn6dw6bao6v Signed-off-by: Lucas Karpinski Cc: Johannes Weiner Cc: Michal Hocko Cc: Muchun Song Cc: Roman Gushchin Cc: Shakeel Butt Cc: Shuah Khan Cc: Tejun Heo Cc: Zefan Li Signed-off-by: Andrew Morton