linux-kernel - Re: [PATCH RFC v2 1/3] drivers/platform/x86: add cpu physically hotplug driver

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Date:	Thu, 6 Jun 2013 11:34:02 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	liguang <lig.fnst@...fujitsu.com>
Cc:	Len Brown <lenb@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	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 1/3] drivers/platform/x86: add cpu physically
 hotplug driver

On Thu, Jun 06, 2013 at 09:40:33AM +0800, liguang wrote:
> this driver will support cpu phyical add/removal automatically
> after online/offline. if cpu hotpluged, cpu will not
> online automatically, and for cpu offline, we try to
> do actually eject if allowed for cpu like
> "echo 1 > /sys/bus/acpi/devices/LNXCPU\:0X/eject"
> this "echo ..." is only present for recent kernel
> (sorry, can't figure out since when), for a little
> older kernel, there's not such approach AFAICS.
> 
> Signed-off-by: liguang <lig.fnst@...fujitsu.com>
> ---
>  drivers/platform/x86/Kconfig              |    8 ++++
>  drivers/platform/x86/Makefile             |    1 +
>  drivers/platform/x86/cpu_physic_hotplug.c |   60 +++++++++++++++++++++++++++++
>  3 files changed, 69 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/platform/x86/cpu_physic_hotplug.c
> 
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index 8577261..39b2392 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -789,4 +789,12 @@ config PVPANIC
>  	  a paravirtualized device provided by QEMU; it lets a virtual machine
>  	  (guest) communicate panic events to the host.
>  
> +config QEMU_CPU_PHYSIC_HOTPLUG

This is hillarious: have you actually checked the dictionary on the
meaning of "physic"?

Yep, "laxative" because the kernel is constipated and can't hold its
CPUs anymore.

LOOOL :-).

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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