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/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)

• Linux 7.0.10
  2026-05-23 11:46 · 1 reply in 7d · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• Linux 6.18.33
  2026-05-23 11:46 · 1 reply in 7d · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• Linux 6.12.91
  2026-05-23 11:46 · 1 reply in 7d · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• Linux 6.6.141
  2026-05-23 11:46 · 1 reply in 7d · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• [RFC PATCH 0/3] perf/x86/amd/uncore: Add common helpers and Hygon support
  2026-05-19 03:32 · 1 reply in 7d · Qi Liu <hidden>
• [PATCH v2 0/2] rust: re-export `unsafe_precondition_assert!` and use in cpu module
  2026-05-18 22:57 · 1 reply in 7d · Ritvik Gupta <hidden>
• [PATCH] rust: cpu: use `unsafe_precondition_assert!`
  2026-05-18 17:40 · 0 replies in 7d · Ritvik Gupta <hidden>

Active reviewers (last 30 days)

• Zhenglang Hu <hidden>
  1 attestation (1 Tested-by) · last on 2026-05-19
• Miguel Ojeda <ojeda@kernel.org>
  1 attestation (1 Suggested-by) · last on 2026-05-18

Recent patches

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

• Re: Linux 7.0.10
  2026-05-23 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• Re: Linux 6.18.33
  2026-05-23 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• Re: Linux 6.12.91
  2026-05-23 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• Re: Linux 6.6.141
  2026-05-23 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• [RFC PATCH 3/3] perf/x86/amd/uncore: Add Hygon uncore PMU support
  2026-05-19 · Qi Liu <hidden>
• [PATCH v2 2/2] rust: cpu: use `unsafe_precondition_assert!`
  2026-05-18 · Ritvik Gupta <hidden>
• [PATCH] rust: cpu: use `unsafe_precondition_assert!`
  2026-05-18 · Ritvik Gupta <hidden>
• [PATCH v3 04/20] cpumask: Introduce cpu_preferred_mask
  2026-05-14 · Shrikanth Hegde <hidden>
• [PATCH v4 1/1] cpuhp: Expedite RCU when toggling system-wide SMT mode
  2026-05-07 · Vishal Chourasia <hidden>
• [PATCH v6 09/22] mm: swap: allocate a virtual swap slot for each swapped out page
  2026-05-05 · Nhat Pham <nphamcs@gmail.com>
• Re: [PATCH v2 03/17] cpumask: Introduce cpu_preferred_mask
  2026-05-05 · Shrikanth Hegde <hidden>
• [RFC PATCH v7 7/7] x86/mm/ibs: In-kernel driver for AMD IBS Memory Profiler
  2026-05-04 · Bharata B Rao <hidden>
• [PATCH 18/23] cpu/hotplug: Add a new cpuhp_offline_cb() API
  2026-04-21 · Waiman Long <longman@redhat.com>
• [PATCH 10/23] cpu: Use RCU to protect access of HK_TYPE_TIMER cpumask
  2026-04-21 · Waiman Long <longman@redhat.com>
• [PATCH] cpu/hotplug: Fix NULL kobject warning in cpuhp_smt_enable()
  2026-04-17 · Jinjie Ruan <hidden>
• [PATCH v2 03/17] cpumask: Introduce cpu_preferred_mask
  2026-04-07 · Shrikanth Hegde <hidden>
• [PATCH v5 9/9] driver core: Replace dev->offline + ->offline_disabled with accessors
  2026-04-06 · Douglas Anderson <dianders@chromium.org>
• [PATCH 4/6] prctl: rename branch landing pad implementation functions to be more explicit
  2026-04-04 · Paul Walmsley <pjw@kernel.org>
• [PATCH v4 9/9] driver core: Replace dev->offline + ->offline_disabled with accessors
  2026-04-04 · Douglas Anderson <dianders@chromium.org>
• [PATCH v3 9/9] driver core: Replace dev->offline + ->offline_disabled with DEV_FLAGs
  2026-04-03 · Douglas Anderson <dianders@chromium.org>
• [PATCH v5 09/21] mm: swap: allocate a virtual swap slot for each swapped out page
  2026-03-20 · Nhat Pham <nphamcs@gmail.com>
• [PATCH v4 09/21] mm: swap: allocate a virtual swap slot for each swapped out page
  2026-03-18 · Nhat Pham <nphamcs@gmail.com>
• [BUG] cgroups/cpusets: Spurious CPU-hotplug failures
  2026-03-18 · "Paul E. McKenney" <paulmck@kernel.org>
• [PATCH v2] padata: Put CPU offline callback in ONLINE section to allow failure
  2026-03-13 · Daniel Jordan <daniel.m.jordan@oracle.com>
• [PATCH] padata: Put CPU offline callback in ONLINE section to allow failure
  2026-03-12 · Daniel Jordan <daniel.m.jordan@oracle.com>
• [PATCH v2 04/25] cpu: Annotate static information into meminspect
  2026-03-10 · Mukesh Ojha <hidden>
• [PATCH] riscv: add system error interrupt handler support
  2026-02-26 · Rui Qi <hidden>
• [PATCH v7 2/3] x86/cpu: Check if feature string is non-zero
  2026-02-24 · Maciej Wieczor-Retman <hidden>
• [PATCH v6 2/3] x86/cpu: Check if feature string is non-zero
  2026-02-20 · Maciej Wieczor-Retman <hidden>
• [PATCH v3 2/2] cpuhp: Expedite RCU grace periods during SMT operations
  2026-02-18 · Vishal Chourasia <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.

• [PATCH v23 13/28] prctl: arch-agnostic prctl for indirect branch tracking
  2025-11-13 · Deepak Gupta via B4 Relay <devnull+debug.rivosinc.com@kernel.org> · 2 Reviewed-by
• [tip: core/rseq] cpumask: Cache num_possible_cpus()
  2025-11-20 · tip-bot2 for Thomas Gleixner <hidden> · 3 Reviewed-by
• [tip: core/rseq] cpu: Initialize __num_possible_cpus correctly
  2025-11-23 · tip-bot2 for Thomas Gleixner <hidden> · 2 Tested-by
• [tip: core/rseq] cpumask: Cache num_possible_cpus()
  2025-11-26 · tip-bot2 for Thomas Gleixner <hidden> · 3 Reviewed-by
• [PATCH v24 13/28] prctl: arch-agnostic prctl for indirect branch tracking
  2025-12-04 · Deepak Gupta <hidden> · 2 Reviewed-by, 2 Tested-by
• [PATCH v25 13/28] prctl: arch-agnostic prctl for indirect branch tracking
  2025-12-05 · Deepak Gupta <hidden> · 2 Reviewed-by, 2 Tested-by
• [PATCH v25 13/28] prctl: arch-agnostic prctl for indirect branch tracking
  2025-12-05 · Deepak Gupta via B4 Relay <devnull+debug.rivosinc.com@kernel.org> · 2 Reviewed-by, 2 Tested-by
• [PATCH v26 13/28] prctl: arch-agnostic prctl for indirect branch tracking
  2025-12-11 · Deepak Gupta via B4 Relay <devnull+debug.rivosinc.com@kernel.org> · 2 Reviewed-by, 2 Tested-by
• [PATCH 27/36] rust: cpu: Add __rust_helper to helpers
  2026-01-11 · Boqun Feng <hidden> · 2 Reviewed-by
• [tip: locking/core] rust: cpu: Add __rust_helper to helpers
  2026-01-13 · tip-bot2 for Alice Ryhl <hidden> · 2 Reviewed-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.

• [PATCH 02/31] cpu: Revert "cpu/hotplug: Prevent self deadlock on CPU hot-unplug"
  2025-11-05 · Frederic Weisbecker <frederic@kernel.org>
• [PATCH 10/31] cpu: Provide lockdep check for CPU hotplug lock write-held
  2025-11-05 · Frederic Weisbecker <frederic@kernel.org>
• [PATCH 27/31] sched/arm64: Move fallback task cpumask to HK_TYPE_DOMAIN
  2025-11-05 · Frederic Weisbecker <frederic@kernel.org>
• [PATCH 04/26] cpu: Annotate static information into meminspect
  2025-11-19 · Eugen Hristev <hidden>
• [PATCH 10/46] rust: cpu: add __rust_helper to helpers
  2025-12-02 · Alice Ryhl <aliceryhl@google.com>
• [PATCH v18 26/42] cpu/hotplug: use a weaker annotation in AP thread
  2025-12-05 · Byungchul Park <byungchul@sk.com>
• [tip: smp/urgent] cpu: Make atomic hotplug callbacks run with interrupts disabled on UP
  2025-12-10 · tip-bot2 for Sebastian Andrzej Siewior <hidden>
• Re: Linux 6.18.2
  2025-12-18 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• Re: Linux 6.17.13
  2025-12-18 · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
• [PATCH v4 09/17] ras: AEST: Add cpuhp callback
  2025-12-22 · Ruidong Tian <hidden>