linux-kernel - Re: [PATCH RFC v2 0/3] add cpu physically hotplug driver

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Date:	Thu, 06 Jun 2013 13:00:31 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	liguang <lig.fnst@...fujitsu.com>
Cc:	Len Brown <lenb@...nel.org>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	platform-driver-x86@...r.kernel.org,
	Andreas Färber <afaerber@...e.de>,
	Igor Mammedov <imammedo@...hat.com>
Subject: Re: [PATCH RFC v2 0/3] add cpu physically hotplug driver

On Thursday, June 06, 2013 09:40:32 AM liguang wrote:
> This patch-set try to support physically hot-plug/unplug
> a cpu automatically, that is:
> if you offline a cpu, it will automatically actually remove
> a cpu, and if you hot-plug a cpu, then it will online this
> cpu automatically.

No and no.

Why do you need this?

Rafael


> so, offline is just like eject, but eject attribute seems not
> available since recent kernel(can't figure out when), with
> this driver, if allowed, it will trigger a eject cpu process.
> and for automatically online, it was said there are objections,
> don't know the reason, so, send this patch-set boldly.
> 
> of course, this approach is for QEMU 's hotplug cpu emulation 
> only, but not limited, if someone like to explore ec space to
> implment cpu hot-plug/unplug for real platform please
> feel free to continue.
> 
> Li Guang (3)
> 	 drivers/platform/x86: add cpu physically hotplug driver
> 	 ec: add ec space notifier
> 	 cpu_physic_hotplug: register handler for ec space notifier
> 
> drivers/acpi/ec.c                         | 32 ++++++++++++++++++++++++++++++++
> drivers/platform/x86/Kconfig              |  8 ++++
> drivers/platform/x86/Makefile             |  1 +
> drivers/platform/x86/cpu_physic_hotplug.c | 90 +++++++++++++++++++++++++++++
> include/linux/acpi.h                      |  2 ++
> 5 files changed, 130 insertions(+), 3 deletions(-)
>  create mode 100644 drivers/platform/x86/cpu_physic_hotplug.c
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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