cpu hotplug · Maintained

Maintainers

• M Thomas Gleixner <tglx@kernel.org>
• M Peter Zijlstra <peterz@infradead.org>

Paths

• F include/linux/cpu.h
• F include/linux/cpuhotplug.h
• F include/linux/cpuhplock.h
• F include/linux/smpboot.h
• F kernel/cpu.c
• F kernel/smpboot.*
• F rust/helpers/cpu.c
• F rust/kernel/cpu.rs

Last 30 days

Most active threads (last 7 days)

• WARM2d [PATCH] cpu/hotplug: Remove CPUHP_AP_ARM_CORESIGHT_CTI_STARTING
  2026-07-15 13:11 · 1 reply in 7d · Zenghui Yu <hidden>

Active reviewers (last 30 days)

• Zhenglang Hu <hidden>
  3 attestations (3 Tested-by) · last on 2026-07-08
• Thomas Gleixner <tglx@kernel.org>
  1 attestation (1 Suggested-by) · last on 2026-06-24

Recent patches

Most-recent 30 patches in this subsystem on lkml (capped at 30), ordered by date desc.

• DORMANTno replies [tip: smp/core] cpu/hotplug: Remove CPUHP_AP_ARM_CORESIGHT_CTI_STARTING
  2026-07-15 · tip-bot2 for Zenghui Yu <hidden>
• WARM2d [PATCH] cpu/hotplug: Remove CPUHP_AP_ARM_CORESIGHT_CTI_STARTING
  2026-07-11 · Zenghui Yu <hidden>
• WARM3d [PATCH v7 02/12] cpumask: Introduce cpu_preferred_mask
  2026-07-09 · Shrikanth Hegde <hidden>
• COOLING9d REVIEWED: 1 (0M) [PATCH v3 1/2] perf/x86/amd/uncore: Add Hygon uncore PMU support
  2026-07-08 · Qi Liu <hidden>
• COOLING6d [PATCH v3 04/26] cpu: Annotate static information into meminspect
  2026-07-08 · Mukesh Ojha <hidden>
• COOLING5d [PATCH v19 26/40] cpu/hotplug: use a weaker annotation in AP thread
  2026-07-06 · Byungchul Park <byungchul@sk.com>
• COOLING10d [PATCH] cpu/hotplug: Use sysfs_emit_at() in states_show()
  2026-07-04 · Bradley Morgan <hidden>
• COOLING9d [PATCH v6 03/23] cpumask: Introduce cpu_preferred_mask
  2026-07-01 · Shrikanth Hegde <hidden>
• COOLING10d REVIEWED: 1 (0M) [PATCH v2 3/3] perf/x86/amd/uncore: Add Hygon uncore PMU support
  2026-07-01 · Qi Liu <hidden>
• COLD17d REVIEWED: 1 (0M) [PATCH 3/3] perf/x86/amd/uncore: Add Hygon uncore PMU support
  2026-07-01 · Qi Liu <hidden>
• COLD17d [PATCH 2/2] rust: kernel: migrate to cfg_select! for config-based selection
  2026-06-29 · Nika Krasnova <hidden>
• COLD17d [PATCH v5 04/24] cpumask: Introduce cpu_preferred_mask
  2026-06-25 · Shrikanth Hegde <hidden>
• COOLING8d [PATCH v3 01/12] cpu/hotplug: Introduce CONFIG_HOTPLUG_PARALLEL_SMT
  2026-06-24 · Jinjie Ruan <hidden>
• COOLING8d [PATCH v3 02/12] cpu/hotplug: Propagate bring-up status to arch_cpuhp_cleanup_kick_cpu()
  2026-06-24 · Jinjie Ruan <hidden>
• DORMANTno replies [tip: smp/urgent] cpu: hotplug: Preserve per instance callback errors
  2026-06-21 · tip-bot2 for Bradley Morgan <hidden>
• COLD26d [tip: smp/urgent] cpu: hotplug: Bound hotplug states sysfs output
  2026-06-21 · tip-bot2 for Bradley Morgan <hidden>
• COLD26d [PATCH 2/2] cpu: hotplug: bound hotplug states sysfs output
  2026-06-19 · Bradley Morgan <hidden>
• COLD26d [PATCH 1/2] cpu: hotplug: preserve per instance callback errors
  2026-06-19 · Bradley Morgan <hidden>
• COLD23d [PATCH v2 1/4] cpu/hotplug: Introduce CONFIG_PARALLEL_SMT_PRIMARY_FIRST
  2026-06-18 · Jinjie Ruan <hidden>
• COLD29d Re: [PATCH v4 04/20] cpumask: Introduce cpu_preferred_mask
  2026-06-18 · Shrikanth Hegde <hidden>
• COLD24d [PATCH v3 05/13] cpu/hotplug: Reserve CPUHP states for nohz_full and managed IRQ down-paths
  2026-06-18 · Jing Wu <hidden>
• COLD29d [PATCH v4 04/20] cpumask: Introduce cpu_preferred_mask
  2026-06-17 · Shrikanth Hegde <hidden>
• COLD32d REVIEWED: 2 (0M) [PATCH v5 1/1] cpuhp: Expedite RCU when toggling system-wide SMT mode
  2026-06-15 · Vishal Chourasia <hidden>
• COLD31d [GIT pull] smp/core for v7.2-rc1
  2026-06-13 · Thomas Gleixner <tglx@kernel.org>
• COLD23d [PATCH RFC 1/3] cpu/hotplug: Introduce CONFIG_PARALLEL_SMT_PRIMARY_FIRST
  2026-06-11 · Jinjie Ruan <hidden>
• DORMANTno replies [PATCH RFC] PM: sleep: Return -ECANCELED if aborting due to pm_wakeup_pending()
  2026-06-09 · Nícolas F. R. A. Prado <hidden>
• COLD39d [PATCH v2 1/2] rust: add a wrapper for the `num_possible_cpus` C function
  2026-06-05 · Andreas Hindborg <a.hindborg@kernel.org>
• COOLING14d [PATCH] kernel/cpu: Disallow offlining boot CPU based on config
  2026-06-05 · Sneh Mankad <hidden>
• DORMANTno replies [tip: smp/core] cpu: Add lockdep_is_cpus_held()/lockdep_is_cpus_write_held() stubs for !CONFIG_HOTPLUG_CPU
  2026-06-04 · tip-bot2 for Reinette Chatre <hidden>
• DORMANTno replies [PATCH 2/2] cpu: Add lockdep_is_cpus_held()/lockdep_is_cpus_write_held() stubs for !CONFIG_HOTPLUG_CPU
  2026-06-04 · Reinette Chatre <reinette.chatre@intel.com>

Needs attention (review trailers in, no pickup)

Patches with review trailers that haven't landed in mainline and haven't been Acked by a maintainer. Oldest first.

• STALE185d REVIEWED: 5 (4M) [PATCH 27/36] rust: cpu: Add __rust_helper to helpers
  2026-01-11 · Boqun Feng <hidden> · 2 Reviewed-by
• STALE129d REVIEWED: 5 (4M) [tip: locking/core] rust: cpu: Add __rust_helper to helpers
  2026-01-13 · tip-bot2 for Alice Ryhl <hidden> · 2 Reviewed-by
• STALE165d REVIEWED: 1 (0M) [PATCH] cpuhp: Expedite synchronize_rcu during SMT switch
  2026-01-19 · Vishal Chourasia <hidden> · 1 Tested-by
• STALE165d REVIEWED: 1 (0M) [RESEND] [PATCH] cpuhp: Expedite synchronize_rcu during SMT switch
  2026-01-19 · Vishal Chourasia <hidden> · 1 Tested-by
• STALE169d REVIEWED: 1 (0M) [PATCH v2] kernel: Add SPDX-License-Identifier lines
  2026-01-19 · Tim Bird <hidden> · 1 Acked-by
• COLD32d REVIEWED: 2 (0M) [PATCH v5 1/1] cpuhp: Expedite RCU when toggling system-wide SMT mode
  2026-06-15 · Vishal Chourasia <hidden> · 1 Reviewed-by, 1 Tested-by
• COOLING10d REVIEWED: 1 (0M) [PATCH v2 3/3] perf/x86/amd/uncore: Add Hygon uncore PMU support
  2026-07-01 · Qi Liu <hidden> · 1 Tested-by

Quiet for 30+ days

Patches with no review trailers and no replies. Either the author is heads-down elsewhere or these slipped through. Oldest first.

• STALE205d [PATCH v4 09/17] ras: AEST: Add cpuhp callback
  2025-12-22 · Ruidong Tian <hidden>
• STALE198d [PATCH 02/33] cpu: Revert "cpu/hotplug: Prevent self deadlock on CPU hot-unplug"
  2025-12-24 · Frederic Weisbecker <frederic@kernel.org>
• STALE198d [PATCH 11/33] cpu: Provide lockdep check for CPU hotplug lock write-held
  2025-12-24 · Frederic Weisbecker <frederic@kernel.org>
• STALE189d [PATCH v5 09/17] ras: AEST: Add cpuhp callback
  2025-12-30 · Ruidong Tian <hidden>
• STALE144d [PATCH 02/33] cpu: Revert "cpu/hotplug: Prevent self deadlock on CPU hot-unplug"
  2026-01-01 · Frederic Weisbecker <frederic@kernel.org>
• STALE144d [PATCH 11/33] cpu: Provide lockdep check for CPU hotplug lock write-held
  2026-01-01 · Frederic Weisbecker <frederic@kernel.org>
• STALE123d [PATCH v6 09/16] ras: AEST: Add cpuhp callback
  2026-01-22 · Ruidong Tian <hidden>
• STALE170d [PATCH 02/33] cpu: Revert "cpu/hotplug: Prevent self deadlock on CPU hot-unplug"
  2026-01-25 · Frederic Weisbecker <frederic@kernel.org>
• STALE170d [PATCH 11/33] cpu: Provide lockdep check for CPU hotplug lock write-held
  2026-01-25 · Frederic Weisbecker <frederic@kernel.org>
• DORMANTno replies [PATCH] kernel/cpu: Fix race conditions, error handling and add safeguards
  2026-02-02 · HackNOW Team <hidden>