From: Hsin-Yi Wang <hsinyi@chromium.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Jiri Kosina <jkosina@suse.cz>,
Pavankumar Kondeti <pkondeti@codeaurora.org>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Zhenzhong Duan <zhenzhong.duan@oracle.com>,
Aaro Koskinen <aaro.koskinen@nokia.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Guenter Roeck <groeck@chromium.org>,
Stephen Boyd <swboyd@chromium.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH RFC v3 0/3] support hotplug CPUs before reboot
Date: Mon, 13 Jan 2020 20:01:54 +0800 [thread overview]
Message-ID: <20200113120157.85798-1-hsinyi@chromium.org> (raw)
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
next reply other threads:[~2020-01-13 12:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-13 12:01 Hsin-Yi Wang [this message]
2020-01-13 12:01 ` [PATCH RFC v3 1/3] reboot: support hotplug CPUs before reboot Hsin-Yi Wang
2020-01-13 12:46 ` Vitaly Kuznetsov
2020-01-13 15:12 ` Hsin-Yi Wang
2020-01-13 15:57 ` Vitaly Kuznetsov
2020-01-13 17:00 ` Hsin-Yi Wang
2020-01-13 12:01 ` [PATCH RFC v3 2/3] arm64: defconfig: enable REBOOT_HOTPLUG_CPU Hsin-Yi Wang
2020-01-13 12:01 ` [PATCH RFC v3 3/3] x86: " Hsin-Yi Wang
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