Development tree for the kernel CSPRNG https://git.zx2c4.com/linux-rng/atom/tools?h=master 2025-12-03T01:49:12Z 2025-12-03T01:49:12Z Linus Torvalds torvalds@linux-foundation.org 2025-12-03T01:49:12Z urn:sha1:619f4edc8d4f785dcabf564786e787fa8108deb4 Pull thermal control updates from Rafael Wysocki: "These add Nova Lake processor support to the Intel thermal drivers and DPTF code, update thermal control documentation, simplify the ACPI DPTF code related to thermal control, add QCS8300 compatible to the tsens thermal DT bindings, add DT bindings for NXP i.MX91 thermal module and add support for it to the imx91 thermal driver, update a few other thermal drivers and fix a format string issue in a thermal utility: - Add Nova Lake processor thermal device to the int340x processor_thermal driver, add DLVR support for Nova Lake to it, add Nova Lake support to the ACPI DPTF code, document thermal throttling on Intel platforms, and update workload type hint interface documentation (Srinivas Pandruvada) - Remove int340x thermal scan handler from the ACPI DPTF code because it turned out to be unnecessary (Slawomir Rosek) - Clean up the Intel int340x thermal driver (Kaushlendra Kumar) - Document the RZ/V2H TSU DT bindings (Ovidiu Panait) - Document the Kaanapali Temperature Sensor (Manaf Meethalavalappu Pallikunhi) - Document R-Car Gen4 and RZ/G2 support in driver comment (Marek Vasut) - Convert to DEFINE_SIMPLE_DEV_PM_OPS() in R-Car [Gen3] (Geert Uytterhoeven) - Fix format string bug in thermal-engine (Malaya Kumar Rout) - Make ipq5018 tsens standalone compatible (George Moussalem) - Add the QCS8300 compatible for QCom Tsens (Gaurav Kohli) - Add support for the NXP i.MX91 thermal module, including the DT bindings (Pengfei Li)" * tag 'thermal-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: thermal/drivers/imx91: Add support for i.MX91 thermal monitoring unit dt-bindings: thermal: fsl,imx91-tmu: add bindings for NXP i.MX91 thermal module dt-bindings: thermal: tsens: Add QCS8300 compatible dt-bindings: thermal: qcom-tsens: make ipq5018 tsens standalone compatible tools/thermal/thermal-engine: Fix format string bug in thermal-engine docs: driver-api/thermal/intel_dptf: Add new workload type hint thermal/drivers/rcar_gen3: Convert to DEFINE_SIMPLE_DEV_PM_OPS() thermal/drivers/rcar: Convert to DEFINE_SIMPLE_DEV_PM_OPS() Documentation: thermal: Document thermal throttling on Intel platforms ACPI: DPTF: Support Nova Lake thermal: intel: int340x: Add DLVR support for Nova Lake thermal: int340x: processor_thermal: Add Nova Lake processor thermal device thermal: intel: int340x: Replace sprintf() with sysfs_emit() thermal: intel: int340x: Use symbolic constant for UUID comparison thermal/drivers/rcar_gen3: Document R-Car Gen4 and RZ/G2 support in driver comment dt-bindings: thermal: qcom-tsens: document the Kaanapali Temperature Sensor dt-bindings: thermal: r9a09g047-tsu: Document RZ/V2H TSU ACPI: DPTF: Remove int340x thermal scan handler thermal: intel: Select INT340X_THERMAL from INTEL_SOC_DTS_THERMAL 2025-12-03T01:31:22Z Linus Torvalds torvalds@linux-foundation.org 2025-12-03T01:31:22Z urn:sha1:d348c22394ad3c8eaf7bc693cb0ca0edc2ec5246 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() ... 2025-12-03T01:24:03Z Linus Torvalds torvalds@linux-foundation.org 2025-12-03T01:24:03Z urn:sha1:959bfe496bbaf3daa5dca32d397e29ea12471779 Pull ACPI updates from Rafael Wysocki: "These add Microsoft fan extensions support to the ACPI fan driver, fix a bug in ACPICA, update other ACPI drivers (processor, time and alarm device), update ACPI power management code and ACPI device properties management, and fix an ACPI utility: - Avoid walking the ACPI namespace in the AML interpreter if the starting node cannot be determined (Cryolitia PukNgae) - Use min() instead of min_t() in the ACPI device properties handling code to avoid discarding significant bits (David Laight) - Fix potential fwnode refcount leak in acpi_fwnode_graph_parse_endpoint() that may prevent the parent fwnode from being released (Haotian Zhang) - Rework acpi_graph_get_next_endpoint() to use ACPI functions only, remove unnecessary conditionals from it to make it easier to follow, and make acpi_get_next_subnode() static (Sakari Ailus) - Drop unused function acpi_get_lps0_constraint(), make some Low-Power S0 callback functions for suspend-to-idle static, and rearrange the code retrieving Low-Power S0 constraints so it only runs when the constraints are actually used (Rafael Wysocki) - Drop redundant locking from the ACPI battery driver (Rafael Wysocki) - Improve runtime PM in the ACPI time and alarm device (TAD) driver using guard macros and rearrange code related to runtime PM in acpi_tad_remove() (Rafael Wysocki) - Add support for Microsoft fan extensions to the ACPI fan driver along with notification support and work around a 64-bit firmware bug in that driver (Armin Wolf) - Use ACPI_FREE() to free ACPI buffer in the ACPI DPTF code (Kaushlendra Kumar) - Fix a memory leak and a resource leak in the ACPI pfrut utility (Malaya Kumar Rout) - Replace `core::mem::zeroed` with `pin_init::zeroed` in the ACPI Rust code (Siyuan Huang) - Update the ACPI code to use the new style of allocating workqueues and new global workqueues (Marco Crivellari) - Fix two spelling mistakes in the ACPI code (Chu Guangqing) - Fix ISAPNP to generate uevents to auto-load modules (René Rebe) - Relocate the state flags initialization in the ACPI processor idle driver and drop redundant C-state count checks from it (Huisong Li) - Fix map_x2apic_id() in the ACPI processor core driver for amd-pstate on am4 (René Rebe)" * tag 'acpi-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (30 commits) ACPI: PM: Fix a spelling mistake ACPI: LPSS: Fix a spelling mistake ACPI: processor_core: fix map_x2apic_id for amd-pstate on am4 ACPICA: Avoid walking the Namespace if start_node is NULL ACPI: tools: pfrut: fix memory leak and resource leak in pfrut.c ACPI: property: use min() instead of min_t() PNP: Fix ISAPNP to generate uevents to auto-load modules ACPI: property: Fix fwnode refcount leak in acpi_fwnode_graph_parse_endpoint() ACPI: DPTF: Use ACPI_FREE() for ACPI buffer deallocation ACPI: processor: idle: Drop redundant C-state count checks ACPI: thermal: Add WQ_PERCPU to alloc_workqueue() users ACPI: OSL: Add WQ_PERCPU to alloc_workqueue() users ACPI: EC: Add WQ_PERCPU to alloc_workqueue() users ACPI: OSL: replace use of system_wq with system_percpu_wq ACPI: scan: replace use of system_unbound_wq with system_dfl_wq ACPI: fan: Add support for Microsoft fan extensions ACPI: fan: Add hwmon notification support ACPI: fan: Add basic notification support ACPI: TAD: Improve runtime PM using guard macros ACPI: TAD: Rearrange runtime PM operations in acpi_tad_remove() ... 2025-12-03T01:03:55Z Linus Torvalds torvalds@linux-foundation.org 2025-12-03T01:03:55Z urn:sha1:44fc84337b6eae580a51cf6f7ca6a22ef1349556 Pull arm64 updates from Catalin Marinas: "These are the arm64 updates for 6.19. The biggest part is the Arm MPAM driver under drivers/resctrl/. There's a patch touching mm/ to handle spurious faults for huge pmd (similar to the pte version). The corresponding arm64 part allows us to avoid the TLB maintenance if a (huge) page is reused after a write fault. There's EFI refactoring to allow runtime services with preemption enabled and the rest is the usual perf/PMU updates and several cleanups/typos. Summary: Core features: - Basic Arm MPAM (Memory system resource Partitioning And Monitoring) driver under drivers/resctrl/ which makes use of the fs/rectrl/ API Perf and PMU: - Avoid cycle counter on multi-threaded CPUs - Extend CSPMU device probing and add additional filtering support for NVIDIA implementations - Add support for the PMUs on the NoC S3 interconnect - Add additional compatible strings for new Cortex and C1 CPUs - Add support for data source filtering to the SPE driver - Add support for i.MX8QM and "DB" PMU in the imx PMU driver Memory managemennt: - Avoid broadcast TLBI if page reused in write fault - Elide TLB invalidation if the old PTE was not valid - Drop redundant cpu_set_*_tcr_t0sz() macros - Propagate pgtable_alloc() errors outside of __create_pgd_mapping() - Propagate return value from __change_memory_common() ACPI and EFI: - Call EFI runtime services without disabling preemption - Remove unused ACPI function Miscellaneous: - ptrace support to disable streaming on SME-only systems - Improve sysreg generation to include a 'Prefix' descriptor - Replace __ASSEMBLY__ with __ASSEMBLER__ - Align register dumps in the kselftest zt-test - Remove some no longer used macros/functions - Various spelling corrections" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (94 commits) arm64/mm: Document why linear map split failure upon vm_reset_perms is not problematic arm64/pageattr: Propagate return value from __change_memory_common arm64/sysreg: Remove unused define ARM64_FEATURE_FIELD_BITS KVM: arm64: selftests: Consider all 7 possible levels of cache KVM: arm64: selftests: Remove ARM64_FEATURE_FIELD_BITS and its last user arm64: atomics: lse: Remove unused parameters from ATOMIC_FETCH_OP_AND macros Documentation/arm64: Fix the typo of register names ACPI: GTDT: Get rid of acpi_arch_timer_mem_init() perf: arm_spe: Add support for filtering on data source perf: Add perf_event_attr::config4 perf/imx_ddr: Add support for PMU in DB (system interconnects) perf/imx_ddr: Get and enable optional clks perf/imx_ddr: Move ida_alloc() from ddr_perf_init() to ddr_perf_probe() dt-bindings: perf: fsl-imx-ddr: Add compatible string for i.MX8QM, i.MX8QXP and i.MX8DXL arm64: remove duplicate ARCH_HAS_MEM_ENCRYPT arm64: mm: use untagged address to calculate page index MAINTAINERS: new entry for MPAM Driver arm_mpam: Add kunit tests for props_mismatch() arm_mpam: Add kunit test for bitmap reset arm_mpam: Add helper to reset saved mbwu state ... 2025-12-03T00:37:00Z Linus Torvalds torvalds@linux-foundation.org 2025-12-03T00:37:00Z urn:sha1:2547f79b0b0cd969ae6f736890af4ebd9368cda5 Pull s390 updates from Heiko Carstens: - Provide a new interface for dynamic configuration and deconfiguration of hotplug memory, allowing with and without memmap_on_memory support. This makes the way memory hotplug is handled on s390 much more similar to other architectures - Remove compat support. There shouldn't be any compat user space around anymore, therefore get rid of a lot of code which also doesn't need to be tested anymore - Add stackprotector support. GCC 16 will get new compiler options, which allow to generate code required for kernel stackprotector support - Merge pai_crypto and pai_ext PMU drivers into a new driver. This removes a lot of duplicated code. The new driver is also extendable and allows to support new PMUs - Add driver override support for AP queues - Rework and extend zcrypt and AP trace events to allow for tracing of crypto requests - Support block sizes larger than 65535 bytes for CCW tape devices - Since the rework of the virtual kernel address space the module area and the kernel image are within the same 4GB area. This eliminates the need of weak per cpu variables. Get rid of ARCH_MODULE_NEEDS_WEAK_PER_CPU - Various other small improvements and fixes * tag 's390-6.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (92 commits) watchdog: diag288_wdt: Remove KMSG_COMPONENT macro s390/entry: Use lay instead of aghik s390/vdso: Get rid of -m64 flag handling s390/vdso: Rename vdso64 to vdso s390: Rename head64.S to head.S s390/vdso: Use common STABS_DEBUG and DWARF_DEBUG macros s390: Add stackprotector support s390/modules: Simplify module_finalize() slightly s390: Remove KMSG_COMPONENT macro s390/percpu: Get rid of ARCH_MODULE_NEEDS_WEAK_PER_CPU s390/ap: Restrict driver_override versus apmask and aqmask use s390/ap: Rename mutex ap_perms_mutex to ap_attr_mutex s390/ap: Support driver_override for AP queue devices s390/ap: Use all-bits-one apmask/aqmask for vfio in_use() checks s390/debug: Update description of resize operation s390/syscalls: Switch to generic system call table generation s390/syscalls: Remove system call table pointer from thread_struct s390/uapi: Remove 31 bit support from uapi header files s390: Remove compat support tools: Remove s390 compat support ... 2025-12-02T22:48:08Z Linus Torvalds torvalds@linux-foundation.org 2025-12-02T22:48:08Z urn:sha1:d61f1cc5db799f4e44a63418b2dc19396787427b Pull x86 CPU feature updates from Dave Hansen: "The biggest thing of note here is Linear Address Space Separation (LASS). It represents the first time I can think of that the upper=>kernel/lower=>user address space convention is actually recognized by the hardware on x86. It ensures that userspace can not even get the hardware to _start_ page walks for the kernel address space. This, of course, is a really nice generic side channel defense. This is really only a down payment on LASS support. There are still some details to work out in its interaction with EFI calls and vsyscall emulation. For now, LASS is disabled if either of those features is compiled in (which is almost always the case). There's also one straggler commit in here which converts an under-utilized AMD CPU feature leaf into a generic Linux-defined leaf so more feature can be packed in there. Summary: - Enable Linear Address Space Separation (LASS) - Change X86_FEATURE leaf 17 from an AMD leaf to Linux-defined" * tag 'x86_cpu_for_6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/cpu: Enable LASS during CPU initialization selftests/x86: Update the negative vsyscall tests to expect a #GP x86/traps: Communicate a LASS violation in #GP message x86/kexec: Disable LASS during relocate kernel x86/alternatives: Disable LASS when patching kernel code x86/asm: Introduce inline memcpy and memset x86/cpu: Add an LASS dependency on SMAP x86/cpufeatures: Enumerate the LASS feature bits x86/cpufeatures: Make X86_FEATURE leaf 17 Linux-specific 2025-12-02T20:17:47Z Linus Torvalds torvalds@linux-foundation.org 2025-12-02T20:17:47Z urn:sha1:d7489818348e5374a8a12a309183fa44b3df41cc Pull x86 cleanups from Borislav Petkov: - The mandatory pile of cleanups the cat drags in every merge window * tag 'x86_cleanups_for_v6.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/boot: Clean up whitespace in a20.c x86/mm: Delete disabled debug code x86/{boot,mtrr}: Remove unused function declarations x86/percpu: Use BIT_WORD() and BIT_MASK() macros x86/cpufeatures: Correct LKGS feature flag description x86/idtentry: Add missing '*' to kernel-doc lines 2025-12-02T17:58:33Z Linus Torvalds torvalds@linux-foundation.org 2025-12-02T17:58:33Z urn:sha1:d42e504a555d0da2a10001e697f0c8a7f633fb05 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 2025-12-02T04:42:01Z Linus Torvalds torvalds@linux-foundation.org 2025-12-02T04:42:01Z urn:sha1:6c26fbe8c9d3e932dce6afe2505b19b4b261cae9 Pull performance events updates from Ingo Molnar: "Callchain support: - Add support for deferred user-space stack unwinding for perf, enabled on x86. (Peter Zijlstra, Steven Rostedt) - unwind_user/x86: Enable frame pointer unwinding on x86 (Josh Poimboeuf) x86 PMU support and infrastructure: - x86/insn: Simplify for_each_insn_prefix() (Peter Zijlstra) - x86/insn,uprobes,alternative: Unify insn_is_nop() (Peter Zijlstra) Intel PMU driver: - Large series to prepare for and implement architectural PEBS support for Intel platforms such as Clearwater Forest (CWF) and Panther Lake (PTL). (Dapeng Mi, Kan Liang) - Check dynamic constraints (Kan Liang) - Optimize PEBS extended config (Peter Zijlstra) - cstates: - Remove PC3 support from LunarLake (Zhang Rui) - Add Pantherlake support (Zhang Rui) - Clearwater Forest support (Zide Chen) AMD PMU driver: - x86/amd: Check event before enable to avoid GPF (George Kennedy) Fixes and cleanups: - task_work: Fix NMI race condition (Peter Zijlstra) - perf/x86: Fix NULL event access and potential PEBS record loss (Dapeng Mi) - Misc other fixes and cleanups (Dapeng Mi, Ingo Molnar, Peter Zijlstra)" * tag 'perf-core-2025-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (38 commits) perf/x86/intel: Fix and clean up intel_pmu_drain_arch_pebs() type use perf/x86/intel: Optimize PEBS extended config perf/x86/intel: Check PEBS dyn_constraints perf/x86/intel: Add a check for dynamic constraints perf/x86/intel: Add counter group support for arch-PEBS perf/x86/intel: Setup PEBS data configuration and enable legacy groups perf/x86/intel: Update dyn_constraint base on PEBS event precise level perf/x86/intel: Allocate arch-PEBS buffer and initialize PEBS_BASE MSR perf/x86/intel: Process arch-PEBS records or record fragments perf/x86/intel/ds: Factor out PEBS group processing code to functions perf/x86/intel/ds: Factor out PEBS record processing code to functions perf/x86/intel: Initialize architectural PEBS perf/x86/intel: Correct large PEBS flag check perf/x86/intel: Replace x86_pmu.drain_pebs calling with static call perf/x86: Fix NULL event access and potential PEBS record loss perf/x86: Remove redundant is_x86_event() prototype entry,unwind/deferred: Fix unwind_reset_info() placement unwind_user/x86: Fix arch=um build perf: Support deferred user unwind unwind_user/x86: Teach FP unwind about start of function ... 2025-12-02T04:18:59Z Linus Torvalds torvalds@linux-foundation.org 2025-12-02T04:18:59Z urn:sha1:63e6995005be8ceb8a1d56a18df1a1a40c28356d Pull objtool updates from Ingo Molnar: - klp-build livepatch module generation (Josh Poimboeuf) Introduce new objtool features and a klp-build script to generate livepatch modules using a source .patch as input. This builds on concepts from the longstanding out-of-tree kpatch project which began in 2012 and has been used for many years to generate livepatch modules for production kernels. However, this is a complete rewrite which incorporates hard-earned lessons from 12+ years of maintaining kpatch. Key improvements compared to kpatch-build: - Integrated with objtool: Leverages objtool's existing control-flow graph analysis to help detect changed functions. - Works on vmlinux.o: Supports late-linked objects, making it compatible with LTO, IBT, and similar. - Simplified code base: ~3k fewer lines of code. - Upstream: No more out-of-tree #ifdef hacks, far less cruft. - Cleaner internals: Vastly simplified logic for symbol/section/reloc inclusion and special section extraction. - Robust __LINE__ macro handling: Avoids false positive binary diffs caused by the __LINE__ macro by introducing a fix-patch-lines script which injects #line directives into the source .patch to preserve the original line numbers at compile time. - Disassemble code with libopcodes instead of running objdump (Alexandre Chartre) - Disassemble support (-d option to objtool) by Alexandre Chartre, which supports the decoding of various Linux kernel code generation specials such as alternatives: 17ef: sched_balance_find_dst_group+0x62f mov 0x34(%r9),%edx 17f3: sched_balance_find_dst_group+0x633 | <alternative.17f3> | X86_FEATURE_POPCNT 17f3: sched_balance_find_dst_group+0x633 | call 0x17f8 <__sw_hweight64> | popcnt %rdi,%rax 17f8: sched_balance_find_dst_group+0x638 cmp %eax,%edx ... jump table alternatives: 1895: sched_use_asym_prio+0x5 test $0x8,%ch 1898: sched_use_asym_prio+0x8 je 0x18a9 <sched_use_asym_prio+0x19> 189a: sched_use_asym_prio+0xa | <jump_table.189a> | JUMP 189a: sched_use_asym_prio+0xa | jmp 0x18ae <sched_use_asym_prio+0x1e> | nop2 189c: sched_use_asym_prio+0xc mov $0x1,%eax 18a1: sched_use_asym_prio+0x11 and $0x80,%ecx ... exception table alternatives: native_read_msr: 5b80: native_read_msr+0x0 mov %edi,%ecx 5b82: native_read_msr+0x2 | <ex_table.5b82> | EXCEPTION 5b82: native_read_msr+0x2 | rdmsr | resume at 0x5b84 <native_read_msr+0x4> 5b84: native_read_msr+0x4 shl $0x20,%rdx .... x86 feature flag decoding (also see the X86_FEATURE_POPCNT example in sched_balance_find_dst_group() above): 2faaf: start_thread_common.constprop.0+0x1f jne 0x2fba4 <start_thread_common.constprop.0+0x114> 2fab5: start_thread_common.constprop.0+0x25 | <alternative.2fab5> | X86_FEATURE_ALWAYS | X86_BUG_NULL_SEG 2fab5: start_thread_common.constprop.0+0x25 | jmp 0x2faba <.altinstr_aux+0x2f4> | jmp 0x4b0 <start_thread_common.constprop.0+0x3f> | nop5 2faba: start_thread_common.constprop.0+0x2a mov $0x2b,%eax ... NOP sequence shortening: 1048e2: snapshot_write_finalize+0xc2 je 0x104917 <snapshot_write_finalize+0xf7> 1048e4: snapshot_write_finalize+0xc4 nop6 1048ea: snapshot_write_finalize+0xca nop11 1048f5: snapshot_write_finalize+0xd5 nop11 104900: snapshot_write_finalize+0xe0 mov %rax,%rcx 104903: snapshot_write_finalize+0xe3 mov 0x10(%rdx),%rax ... and much more. - Function validation tracing support (Alexandre Chartre) - Various -ffunction-sections fixes (Josh Poimboeuf) - Clang AutoFDO (Automated Feedback-Directed Optimizations) support (Josh Poimboeuf) - Misc fixes and cleanups (Borislav Petkov, Chen Ni, Dylan Hatch, Ingo Molnar, John Wang, Josh Poimboeuf, Pankaj Raghav, Peter Zijlstra, Thorsten Blum) * tag 'objtool-core-2025-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (129 commits) objtool: Fix segfault on unknown alternatives objtool: Build with disassembly can fail when including bdf.h objtool: Trim trailing NOPs in alternative objtool: Add wide output for disassembly objtool: Compact output for alternatives with one instruction objtool: Improve naming of group alternatives objtool: Add Function to get the name of a CPU feature objtool: Provide access to feature and flags of group alternatives objtool: Fix address references in alternatives objtool: Disassemble jump table alternatives objtool: Disassemble exception table alternatives objtool: Print addresses with alternative instructions objtool: Disassemble group alternatives objtool: Print headers for alternatives objtool: Preserve alternatives order objtool: Add the --disas=<function-pattern> action objtool: Do not validate IBT for .return_sites and .call_sites objtool: Improve tracing of alternative instructions objtool: Add functions to better name alternatives objtool: Identify the different types of alternatives ...