linux-rng/kernel/cgroup, branch master

Merge tag 'pm-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2025-12-03T01:31:22Z

Pull power management updates from Rafael Wysocki: "There are quite a few interesting things here, including new hardware support, new features, some bug fixes and documentation updates. In addition, there are a usual bunch of minor fixes and cleanups all over. In the new hardware support category, there are intel_pstate and intel_rapl driver updates to support new processors, Panther Lake, Wildcat Lake, Noval Lake, and Diamond Rapids in the OOB mode, OPP and bandwidth allocation support in the tegra186 cpufreq driver, and JH7110S SOC support in dt-platdev cpufreq. The new features are the PM QoS CPU latency limit for suspend-to-idle, the netlink support for the energy model management, support for terminating system suspend via a wakeup event during the sync of file systems, configurable number of hibernation compression threads, the runtime PM auto-cleanup macros, and the "poweroff" PM event that is expected to be used during system shutdown. Bugs are mostly fixed in cpuidle governors, but there are also fixes elsewhere, like in the amd-pstate cpufreq driver. Documentation updates include, but are not limited to, a new doc on debugging shutdown hangs, cross-referencing fixes and cleanups in the intel_pstate documentation, and updates of comments in the core hibernation code. Specifics: - Introduce and document a QoS limit on CPU exit latency during wakeup from suspend-to-idle (Ulf Hansson) - Add support for building libcpupower statically (Zuo An) - Add support for sending netlink notifications to user space on energy model updates (Changwoo Mini, Peng Fan) - Minor improvements to the Rust OPP interface (Tamir Duberstein) - Fixes to scope-based pointers in the OPP library (Viresh Kumar) - Use residency threshold in polling state override decisions in the menu cpuidle governor (Aboorva Devarajan) - Add sanity check for exit latency and target residency in the cpufreq core (Rafael Wysocki) - Use this_cpu_ptr() where possible in the teo governor (Christian Loehle) - Rework the handling of tick wakeups in the teo cpuidle governor to increase the likelihood of stopping the scheduler tick in the cases when tick wakeups can be counted as non-timer ones (Rafael Wysocki) - Fix a reverse condition in the teo cpuidle governor and drop a misguided target residency check from it (Rafael Wysocki) - Clean up multiple minor defects in the teo cpuidle governor (Rafael Wysocki) - Update header inclusion to make it follow the Include What You Use principle (Andy Shevchenko) - Enable MSR-based RAPL PMU support in the intel_rapl power capping driver and arrange for using it on the Panther Lake and Wildcat Lake processors (Kuppuswamy Sathyanarayanan) - Add support for Nova Lake and Wildcat Lake processors to the intel_rapl power capping driver (Kaushlendra Kumar, Srinivas Pandruvada) - Add OPP and bandwidth support for Tegra186 (Aaron Kling) - Optimizations for parameter array handling in the amd-pstate cpufreq driver (Mario Limonciello) - Fix for mode changes with offline CPUs in the amd-pstate cpufreq driver (Gautham Shenoy) - Preserve freq_table_sorted across suspend/hibernate in the cpufreq core (Zihuan Zhang) - Adjust energy model rules for Intel hybrid platforms in the intel_pstate cpufreq driver and improve printing of debug messages in it (Rafael Wysocki) - Replace deprecated strcpy() in cpufreq_unregister_governor() (Thorsten Blum) - Fix duplicate hyperlink target errors in the intel_pstate cpufreq driver documentation and use :ref: directive for internal linking in it (Swaraj Gaikwad, Bagas Sanjaya) - Add Diamond Rapids OOB mode support to the intel_pstate cpufreq driver (Kuppuswamy Sathyanarayanan) - Use mutex guard for driver locking in the intel_pstate driver and eliminate some code duplication from it (Rafael Wysocki) - Replace udelay() with usleep_range() in ACPI cpufreq (Kaushlendra Kumar) - Minor improvements to various cpufreq drivers (Christian Marangi, Hal Feng, Jie Zhan, Marco Crivellari, Miaoqian Lin, and Shuhao Fu) - Replace snprintf() with scnprintf() in show_trace_dev_match() (Kaushlendra Kumar) - Fix memory allocation error handling in pm_vt_switch_required() (Malaya Kumar Rout) - Introduce CALL_PM_OP() macro and use it to simplify code in generic PM operations (Kaushlendra Kumar) - Add module param to backtrace all CPUs in the device power management watchdog (Sergey Senozhatsky) - Rework message printing in swsusp_save() (Rafael Wysocki) - Make it possible to change the number of hibernation compression threads (Xueqin Luo) - Clarify that only cgroup1 freezer uses PM freezer (Tejun Heo) - Add document on debugging shutdown hangs to PM documentation and correct a mistaken configuration option in it (Mario Limonciello) - Shut down wakeup source timer before removing the wakeup source from the list (Kaushlendra Kumar, Rafael Wysocki) - Introduce new PMSG_POWEROFF event for system shutdown handling with the help of PM device callbacks (Mario Limonciello) - Make pm_test delay interruptible by wakeup events (Riwen Lu) - Clean up kernel-doc comment style usage in the core hibernation code and remove unuseful comments from it (Sunday Adelodun, Rafael Wysocki) - Add support for handling wakeup events and aborting the suspend process while it is syncing file systems (Samuel Wu, Rafael Wysocki) - Add WQ_UNBOUND to pm_wq workqueue (Marco Crivellari) - Add runtime PM wrapper macros for ACQUIRE()/ACQUIRE_ERR() and use them in the PCI core and the ACPI TAD driver (Rafael Wysocki) - Improve runtime PM in the ACPI TAD driver (Rafael Wysocki) - Update pm_runtime_allow/forbid() documentation (Rafael Wysocki) - Fix typos in runtime.c comments (Malaya Kumar Rout) - Move governor.h from devfreq under include/linux/ and rename to devfreq-governor.h to allow devfreq governor definitions in out of drivers/devfreq/ (Dmitry Baryshkov) - Use min() to improve readability in tegra30-devfreq.c (Thorsten Blum) - Fix potential use-after-free issue of OPP handling in hisi_uncore_freq.c (Pengjie Zhang) - Fix typo in DFSO_DOWNDIFFERENTIAL macro name in governor_simpleondemand.c in devfreq (Riwen Lu)" * tag 'pm-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (96 commits) PM / devfreq: Fix typo in DFSO_DOWNDIFFERENTIAL macro name cpuidle: Warn instead of bailing out if target residency check fails cpuidle: Update header inclusion Documentation: power/cpuidle: Document the CPU system wakeup latency QoS cpuidle: Respect the CPU system wakeup QoS limit for cpuidle sched: idle: Respect the CPU system wakeup QoS limit for s2idle pmdomain: Respect the CPU system wakeup QoS limit for cpuidle pmdomain: Respect the CPU system wakeup QoS limit for s2idle PM: QoS: Introduce a CPU system wakeup QoS limit cpuidle: governors: teo: Add missing space to the description PM: hibernate: Extra cleanup of comments in swap handling code PM / devfreq: tegra30: use min to simplify actmon_cpu_to_emc_rate PM / devfreq: hisi: Fix potential UAF in OPP handling PM / devfreq: Move governor.h to a public header location powercap: intel_rapl: Enable MSR-based RAPL PMU support powercap: intel_rapl: Prepare read_raw() interface for atomic-context callers cpufreq: qcom-nvmem: fix compilation warning for qcom_cpufreq_ipq806x_match_list PM: sleep: Call pm_sleep_fs_sync() instead of ksys_sync_helper() PM: sleep: Add support for wakeup during filesystem sync cpufreq: ACPI: Replace udelay() with usleep_range() ...

Merge tag 'timers-core-2025-11-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2025-12-02T17:58:33Z

Pull timer core updates from Thomas Gleixner: - Prevent a thundering herd problem when the timekeeper CPU is delayed and a large number of CPUs compete to acquire jiffies_lock to do the update. Limit it to one CPU with a separate "uncontended" atomic variable. - A set of improvements for the timer migration mechanism: - Support imbalanced NUMA trees correctly - Support dynamic exclusion of CPUs from the migrator duty to allow the cpuset/isolation mechanism to exclude them from handling timers of remote idle CPUs - The usual small updates, cleanups and enhancements * tag 'timers-core-2025-11-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: timers/migration: Exclude isolated cpus from hierarchy cpumask: Add initialiser to use cleanup helpers sched/isolation: Force housekeeping if isolcpus and nohz_full don't leave any cgroup/cpuset: Rename update_unbound_workqueue_cpumask() to update_isolation_cpumasks() timers/migration: Use scoped_guard on available flag set/clear timers/migration: Add mask for CPUs available in the hierarchy timers/migration: Rename 'online' bit to 'available' selftests/timers/nanosleep: Add tests for return of remaining time selftests/timers: Clean up kernel version check in posix_timers time: Fix a few typos in time[r] related code comments time: tick-oneshot: Add missing Return and parameter descriptions to kernel-doc hrtimer: Store time as ktime_t in restart block timers/migration: Remove dead code handling idle CPU checking for remote timers timers/migration: Remove unused "cpu" parameter from tmigr_get_group() timers/migration: Assert that hotplug preparing CPU is part of stable active hierarchy timers/migration: Fix imbalanced NUMA trees timers/migration: Remove locking on group connection timers/migration: Convert "while" loops to use "for" tick/sched: Limit non-timekeeper CPUs calling jiffies update

Merge tag 'sched-core-2025-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2025-12-02T05:04:45Z

Pull scheduler updates from Ingo Molnar: "Scalability and load-balancing improvements: - Enable scheduler feature NEXT_BUDDY (Mel Gorman) - Reimplement NEXT_BUDDY to align with EEVDF goals (Mel Gorman) - Skip sched_balance_running cmpxchg when balance is not due (Tim Chen) - Implement generic code for architecture specific sched domain NUMA distances (Tim Chen) - Optimize the NUMA distances of the sched-domains builds of Intel Granite Rapids (GNR) and Clearwater Forest (CWF) platforms (Tim Chen) - Implement proportional newidle balance: a randomized algorithm that runs newidle balancing proportional to its success rate. (Peter Zijlstra) Scheduler infrastructure changes: - Implement the 'sched_change' scoped_guard() pattern for the entire scheduler (Peter Zijlstra) - More broadly utilize the sched_change guard (Peter Zijlstra) - Add support to pick functions to take runqueue-flags (Joel Fernandes) - Provide and use set_need_resched_current() (Peter Zijlstra) Fair scheduling enhancements: - Forfeit vruntime on yield (Fernand Sieber) - Only update stats for allowed CPUs when looking for dst group (Adam Li) CPU-core scheduling enhancements: - Optimize core cookie matching check (Fernand Sieber) Deadline scheduler fixes: - Only set free_cpus for online runqueues (Doug Berger) - Fix dl_server time accounting (Peter Zijlstra) - Fix dl_server stop condition (Peter Zijlstra) Proxy scheduling fixes: - Yield the donor task (Fernand Sieber) Fixes and cleanups: - Fix do_set_cpus_allowed() locking (Peter Zijlstra) - Fix migrate_disable_switch() locking (Peter Zijlstra) - Remove double update_rq_clock() in __set_cpus_allowed_ptr_locked() (Hao Jia) - Increase sched_tick_remote timeout (Phil Auld) - sched/deadline: Use cpumask_weight_and() in dl_bw_cpus() (Shrikanth Hegde) - sched/deadline: Clean up select_task_rq_dl() (Shrikanth Hegde)" * tag 'sched-core-2025-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (44 commits) sched: Provide and use set_need_resched_current() sched/fair: Proportional newidle balance sched/fair: Small cleanup to update_newidle_cost() sched/fair: Small cleanup to sched_balance_newidle() sched/fair: Revert max_newidle_lb_cost bump sched/fair: Reimplement NEXT_BUDDY to align with EEVDF goals sched/fair: Enable scheduler feature NEXT_BUDDY sched: Increase sched_tick_remote timeout sched/fair: Have SD_SERIALIZE affect newidle balancing sched/fair: Skip sched_balance_running cmpxchg when balance is not due sched/deadline: Minor cleanup in select_task_rq_dl() sched/deadline: Use cpumask_weight_and() in dl_bw_cpus sched/deadline: Document dl_server sched/deadline: Fix dl_server stop condition sched/deadline: Fix dl_server time accounting sched/core: Remove double update_rq_clock() in __set_cpus_allowed_ptr_locked() sched/eevdf: Fix min_vruntime vs avg_vruntime sched/core: Add comment explaining force-idle vruntime snapshots sched/core: Optimize core cookie matching check sched/proxy: Yield the donor task ...

Merge tag 'kernel-6.19-rc1.cred' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

2025-12-01T21:45:41Z

Pull cred guard updates from Christian Brauner: "This contains substantial credential infrastructure improvements adding guard-based credential management that simplifies code and eliminates manual reference counting in many subsystems. Features: - Kernel Credential Guards Add with_kernel_creds() and scoped_with_kernel_creds() guards that allow using the kernel credentials without allocating and copying them. This was requested by Linus after seeing repeated prepare_kernel_creds() calls that duplicate the kernel credentials only to drop them again later. The new guards completely avoid the allocation and never expose the temporary variable to hold the kernel credentials anywhere in callers. - Generic Credential Guards Add scoped_with_creds() guards for the common override_creds() and revert_creds() pattern. This builds on earlier work that made override_creds()/revert_creds() completely reference count free. - Prepare Credential Guards Add prepare credential guards for the more complex pattern of preparing a new set of credentials and overriding the current credentials with them: - prepare_creds() - modify new creds - override_creds() - revert_creds() - put_cred() Cleanups: - Make init_cred static since it should not be directly accessed - Add kernel_cred() helper to properly access the kernel credentials - Fix scoped_class() macro that was introduced two cycles ago - coredump: split out do_coredump() from vfs_coredump() for cleaner credential handling - coredump: move revert_cred() before coredump_cleanup() - coredump: mark struct mm_struct as const - coredump: pass struct linux_binfmt as const - sev-dev: use guard for path" * tag 'kernel-6.19-rc1.cred' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (36 commits) trace: use override credential guard trace: use prepare credential guard coredump: use override credential guard coredump: use prepare credential guard coredump: split out do_coredump() from vfs_coredump() coredump: mark struct mm_struct as const coredump: pass struct linux_binfmt as const coredump: move revert_cred() before coredump_cleanup() sev-dev: use override credential guards sev-dev: use prepare credential guard sev-dev: use guard for path cred: add prepare credential guard net/dns_resolver: use credential guards in dns_query() cgroup: use credential guards in cgroup_attach_permissions() act: use credential guards in acct_write_process() smb: use credential guards in cifs_get_spnego_key() nfs: use credential guards in nfs_idmap_get_key() nfs: use credential guards in nfs_local_call_write() nfs: use credential guards in nfs_local_call_read() erofs: use credential guards ...

timers/migration: Exclude isolated cpus from hierarchy

2025-11-20T19:17:32Z

The timer migration mechanism allows active CPUs to pull timers from idle ones to improve the overall idle time. This is however undesired when CPU intensive workloads run on isolated cores, as the algorithm would move the timers from housekeeping to isolated cores, negatively affecting the isolation. Exclude isolated cores from the timer migration algorithm, extend the concept of unavailable cores, currently used for offline ones, to isolated ones: * A core is unavailable if isolated or offline; * A core is available if non isolated and online; A core is considered unavailable as isolated if it belongs to: * the isolcpus (domain) list * an isolated cpuset Except if it is: * in the nohz_full list (already idle for the hierarchy) * the nohz timekeeper core (must be available to handle global timers) CPUs are added to the hierarchy during late boot, excluding isolated ones, the hierarchy is also adapted when the cpuset isolation changes. Due to how the timer migration algorithm works, any CPU part of the hierarchy can have their global timers pulled by remote CPUs and have to pull remote timers, only skipping pulling remote timers would break the logic. For this reason, prevent isolated CPUs from pulling remote global timers, but also the other way around: any global timer started on an isolated CPU will run there. This does not break the concept of isolation (global timers don't come from outside the CPU) and, if considered inappropriate, can usually be mitigated with other isolation techniques (e.g. IRQ pinning). This effect was noticed on a 128 cores machine running oslat on the isolated cores (1-31,33-63,65-95,97-127). The tool monopolises CPUs, and the CPU with lowest count in a timer migration hierarchy (here 1 and 65) appears as always active and continuously pulls global timers, from the housekeeping CPUs. This ends up moving driver work (e.g. delayed work) to isolated CPUs and causes latency spikes: before the change: # oslat -c 1-31,33-63,65-95,97-127 -D 62s ... Maximum: 1203 10 3 4 ... 5 (us) after the change: # oslat -c 1-31,33-63,65-95,97-127 -D 62s ... Maximum: 10 4 3 4 3 ... 5 (us) The same behaviour was observed on a machine with as few as 20 cores / 40 threads with isocpus set to: 1-9,11-39 with rtla-osnoise-top. Signed-off-by: Gabriele Monaco Signed-off-by: Thomas Gleixner Tested-by: John B. Wyatt IV Reviewed-by: Thomas Gleixner Reviewed-by: Frederic Weisbecker Link: https://patch.msgid.link/20251120145653.296659-8-gmonaco@redhat.com

cgroup/cpuset: Rename update_unbound_workqueue_cpumask() to update_isolation_cpumasks()

2025-11-20T19:17:31Z

update_unbound_workqueue_cpumask() updates unbound workqueues settings when there's a change in isolated CPUs, but it can be used for other subsystems requiring updated when isolated CPUs change. Generalise the name to update_isolation_cpumasks() to prepare for other functions unrelated to workqueues to be called in that spot. [longman: Change the function name to update_isolation_cpumasks()] Signed-off-by: Gabriele Monaco Signed-off-by: Waiman Long Signed-off-by: Thomas Gleixner Reviewed-by: Chen Ridong Acked-by: Frederic Weisbecker Acked-by: Waiman Long Link: https://patch.msgid.link/20251120145653.296659-5-gmonaco@redhat.com

Merge back earlier material related to system sleep for 6.19

2025-11-17T15:55:55Z

ns: drop custom reference count initialization for initial namespaces

2025-11-11T09:01:32Z

Initial namespaces don't modify their reference count anymore. They remain fixed at one so drop the custom refcount initializations. Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-16-e8a9264e0fb9@kernel.org Signed-off-by: Christian Brauner

Merge branch 'kbuild-6.19.fms.extension'

2025-11-11T08:59:08Z

Bring in the shared branch with the kbuild tree to enable '-fms-extensions' for 6.19. Further namespace cleanup work requires this extension. Signed-off-by: Christian Brauner

cgroup: use credential guards in cgroup_attach_permissions()

2025-11-04T11:36:50Z

Use credential guards for scoped credential override with automatic restoration on scope exit. Link: https://patch.msgid.link/20251103-work-creds-guards-simple-v1-15-a3e156839e7f@kernel.org Reviewed-by: Amir Goldstein Signed-off-by: Christian Brauner