linux-kernel - [PATCH RFC v3 0/3] support hotplug CPUs before reboot

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Message-Id: <20200113120157.85798-1-hsinyi@chromium.org>
Date:   Mon, 13 Jan 2020 20:01:54 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Kosina <jkosina@...e.cz>,
        Pavankumar Kondeti <pkondeti@...eaurora.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Zhenzhong Duan <zhenzhong.duan@...cle.com>,
        Aaro Koskinen <aaro.koskinen@...ia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH RFC v3 0/3] support hotplug CPUs before reboot

This series adds a config REBOOT_HOTPLUG_CPU which would hotplug CPUs
before reboot. Architecture code (smp_send_stop) currently would loop
through online secondary CPUs and some may call ipi functions to them.
With this config enabled, ideally we don't need smp_send_stop. But we
keep the code for those don't enable this config and as a backup if
some CPU fails to go offline before reboot.

Also enable this config for arm64 and x86 defconfig as an example.

Change from v2:
* Add another config instead of configed by CONFIG_HOTPLUG_CPU

Hsin-Yi Wang (3):
  reboot: support hotplug CPUs before reboot
  arm64: defconfig: enable REBOOT_HOTPLUG_CPU
  x86: defconfig: enable REBOOT_HOTPLUG_CPU

 arch/Kconfig                      |  6 ++++++
 arch/arm64/configs/defconfig      |  1 +
 arch/x86/configs/i386_defconfig   |  1 +
 arch/x86/configs/x86_64_defconfig |  1 +
 include/linux/cpu.h               |  3 +++
 kernel/cpu.c                      | 19 +++++++++++++++++++
 kernel/reboot.c                   |  8 ++++++++
 7 files changed, 39 insertions(+)

-- 
2.25.0.rc1.283.g88dfdc4193-goog