linux-kernel - Re: [PATCH v3 0/7] ACPI: Add

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Message-ID: <1337816240.16730.333.camel@misato.fc.hp.com>
Date:	Wed, 23 May 2012 17:37:20 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"lenb@...nel.org" <lenb@...nel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"shuahkhan@...il.com" <shuahkhan@...il.com>,
	"liuj97@...il.com" <liuj97@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/7] ACPI: Add _OST support for ACPI hotplug

On Fri, 2012-05-11 at 17:24 +0000, Kani, Toshimitsu wrote:
> On Fri, 2012-05-11 at 10:09 -0700, Andi Kleen wrote:
> > Toshi Kani <toshi.kani@...com> writes:
> > 
> > > This patchset supports ACPI OSPM Status Indication (_OST) method for
> > > ACPI CPU/memory/container hotplug operations and sysfs eject. After
> > > ACPI hotplug operation has completed, OSPM calls _OST to indicate the
> > > result of the operation to the platform. If _OST is not present, this
> > > patchset has no effect on the platform.
> > >
> > > This _OST support can be enabled or disabled with a new config option
> > > CONFIG_ACPI_HOTPLUG_OST. This option is disabled by default. When
> > > this option is disabled, this patchset has no effect on the platform.
> > 
> > Does that control compiling in/out significant sized code?
> > 
> > Controlling code behaviour by CONFIG option has been long deprecated.
> > This is always better done as a runtime option.
> > 
> > Just think what should a distribution who wants to use the same binary
> > on all systems set.
> 
> Good question.  The OS needs to tell the platform if it supports _OST at
> boot-time, and has to stick with it.  Therefore, this feature may not be
> enabled/disabled during run-time.  Another reason is that this feature
> depends on ACPI_HOTPLUG_CPU, ACPI_HOTPLUG_MEMORY and ACPI_CONTAINER
> config options in order to provide consistent behavior among multiple
> hotplug operations with regarding the _OST support.

Hi Andi,

Thinking this further, I have decided to remove this new CONFIG option.
Thanks for your valuable suggestion!

-Toshi

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