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)

• HOTtoday Linux 6.12.97
  2026-07-24 15:06 · 1 reply in 7d · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• DORMANTno replies Linux 6.6.145
  2026-07-24 15:06 · 1 reply in 7d · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• HOTtoday Linux 6.1.178
  2026-07-24 15:06 · 1 reply in 7d · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• HOTtoday Linux 5.10.261
  2026-07-24 15:05 · 1 reply in 7d · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• HOTtoday Linux 5.15.212
  2026-07-24 15:05 · 1 reply in 7d · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• HOTtoday [PATCH v9 00/11] sched, steal_governor: Introduce preferred CPUs and steal-driven vCPU backoff
  2026-07-24 14:09 · 1 reply in 7d · Shrikanth Hegde <hidden>
• HOTtoday [PATCH v4 0/3] drivers/perf: hisi: Updates for HiSilicon uncore PMUs
  2026-07-24 02:53 · 1 reply in 7d · Yushan Wang <wangyushan12@huawei.com>
• WARM2d [RFC PATCH 0/3] sched: Handle CPU freeze without active domain housekeeping CPUs
  2026-07-22 11:53 · 1 reply in 7d · Guopeng Zhang <hidden>
• WARM2d [PATCH v8 00/11] sched, steal_governor: Introduce cpu_preferred_mask and steal-driven vCPU backoff
  2026-07-20 17:24 · 1 reply in 7d · Shrikanth Hegde <hidden>
• COOLING4d [PATCH] cpu/hotplug: Prevent offlining the last domain housekeeping CPU
  2026-07-18 09:53 · 0 replies in 7d · Guopeng Zhang <hidden>

Active reviewers (last 30 days)

• Zhenglang Hu <hidden>
  3 attestations (3 Tested-by) · last on 2026-07-08

Recent patches

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

• DORMANTno replies Re: Linux 6.12.97
  2026-07-24 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• HOTtoday Re: Linux 6.6.145
  2026-07-24 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• DORMANTno replies Re: Linux 6.1.178
  2026-07-24 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• DORMANTno replies Re: Linux 5.10.261
  2026-07-24 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• DORMANTno replies Re: Linux 5.15.212
  2026-07-24 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• HOTtoday [PATCH v9 02/11] cpumask: Introduce cpu_preferred_mask
  2026-07-24 · Shrikanth Hegde <hidden>
• DORMANTno replies [PATCH 1/3] drivers/perf: hisi: Consolidate uncore PMU cpuhp states
  2026-07-24 · Yushan Wang <wangyushan12@huawei.com>
• WARM2d [RFC PATCH 1/3] sched: Preserve user affinity across frozen CPU fallback
  2026-07-22 · Guopeng Zhang <hidden>
• WARM2d [PATCH v8 02/11] cpumask: Introduce cpu_preferred_mask
  2026-07-20 · Shrikanth Hegde <hidden>
• COOLING4d [PATCH] cpu/hotplug: Prevent offlining the last domain housekeeping CPU
  2026-07-18 · Guopeng Zhang <hidden>
• DORMANTno replies [tip: smp/core] cpu/hotplug: Remove CPUHP_AP_ARM_CORESIGHT_CTI_STARTING
  2026-07-15 · tip-bot2 for Zenghui Yu <hidden>
• COOLING9d [PATCH] cpu/hotplug: Remove CPUHP_AP_ARM_CORESIGHT_CTI_STARTING
  2026-07-11 · Zenghui Yu <hidden>
• COOLING10d [PATCH v7 02/12] cpumask: Introduce cpu_preferred_mask
  2026-07-09 · Shrikanth Hegde <hidden>
• COLD15d REVIEWED: 1 (0M) [PATCH v3 1/2] perf/x86/amd/uncore: Add Hygon uncore PMU support
  2026-07-08 · Qi Liu <hidden>
• COOLING13d [PATCH v3 04/26] cpu: Annotate static information into meminspect
  2026-07-08 · Mukesh Ojha <hidden>
• COOLING11d [PATCH v19 26/40] cpu/hotplug: use a weaker annotation in AP thread
  2026-07-06 · Byungchul Park <byungchul@sk.com>
• COLD17d [PATCH] cpu/hotplug: Use sysfs_emit_at() in states_show()
  2026-07-04 · Bradley Morgan <hidden>
• COLD15d [PATCH v6 03/23] cpumask: Introduce cpu_preferred_mask
  2026-07-01 · Shrikanth Hegde <hidden>
• COLD17d REVIEWED: 1 (0M) [PATCH v2 3/3] perf/x86/amd/uncore: Add Hygon uncore PMU support
  2026-07-01 · Qi Liu <hidden>
• COLD23d REVIEWED: 1 (0M) [PATCH 3/3] perf/x86/amd/uncore: Add Hygon uncore PMU support
  2026-07-01 · Qi Liu <hidden>
• COLD23d [PATCH 2/2] rust: kernel: migrate to cfg_select! for config-based selection
  2026-06-29 · Nika Krasnova <hidden>
• COLD24d [PATCH v5 04/24] cpumask: Introduce cpu_preferred_mask
  2026-06-25 · Shrikanth Hegde <hidden>
• COLD15d [PATCH v3 01/12] cpu/hotplug: Introduce CONFIG_HOTPLUG_PARALLEL_SMT
  2026-06-24 · Jinjie Ruan <hidden>
• COLD15d [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>
• COLD33d [tip: smp/urgent] cpu: hotplug: Bound hotplug states sysfs output
  2026-06-21 · tip-bot2 for Bradley Morgan <hidden>
• COLD33d [PATCH 2/2] cpu: hotplug: bound hotplug states sysfs output
  2026-06-19 · Bradley Morgan <hidden>
• COLD33d [PATCH 1/2] cpu: hotplug: preserve per instance callback errors
  2026-06-19 · Bradley Morgan <hidden>
• COLD30d [PATCH v2 1/4] cpu/hotplug: Introduce CONFIG_PARALLEL_SMT_PRIMARY_FIRST
  2026-06-18 · Jinjie Ruan <hidden>
• COLD35d Re: [PATCH v4 04/20] cpumask: Introduce cpu_preferred_mask
  2026-06-18 · Shrikanth Hegde <hidden>

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.

• STALE136d 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
• STALE171d REVIEWED: 1 (0M) [PATCH] cpuhp: Expedite synchronize_rcu during SMT switch
  2026-01-19 · Vishal Chourasia <hidden> · 1 Tested-by
• STALE171d REVIEWED: 1 (0M) [RESEND] [PATCH] cpuhp: Expedite synchronize_rcu during SMT switch
  2026-01-19 · Vishal Chourasia <hidden> · 1 Tested-by
• STALE176d REVIEWED: 1 (0M) [PATCH v2] kernel: Add SPDX-License-Identifier lines
  2026-01-19 · Tim Bird <hidden> · 1 Acked-by
• WARM3d 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
• COLD17d 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.

• STALE196d [PATCH v5 09/17] ras: AEST: Add cpuhp callback
  2025-12-30 · Ruidong Tian <hidden>
• STALE151d [PATCH 02/33] cpu: Revert "cpu/hotplug: Prevent self deadlock on CPU hot-unplug"
  2026-01-01 · Frederic Weisbecker <frederic@kernel.org>
• STALE151d [PATCH 11/33] cpu: Provide lockdep check for CPU hotplug lock write-held
  2026-01-01 · Frederic Weisbecker <frederic@kernel.org>
• STALE129d [PATCH v6 09/16] ras: AEST: Add cpuhp callback
  2026-01-22 · Ruidong Tian <hidden>
• STALE177d [PATCH 02/33] cpu: Revert "cpu/hotplug: Prevent self deadlock on CPU hot-unplug"
  2026-01-25 · Frederic Weisbecker <frederic@kernel.org>
• STALE177d [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>
• STALE64d [PATCH v2 04/25] cpu: Annotate static information into meminspect
  2026-03-10 · Mukesh Ojha <hidden>
• STALE84d [PATCH v5 09/21] mm: swap: allocate a virtual swap slot for each swapped out page
  2026-03-20 · Nhat Pham <nphamcs@gmail.com>
• STALE110d [PATCH 4/6] prctl: rename branch landing pad implementation functions to be more explicit
  2026-04-04 · Paul Walmsley <pjw@kernel.org>