linux-kernel - Re: [update][PATCH v10 06/21] ACPI / sleep: Introduce CONFIG_ACPI_GENERIC

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Message-ID: <2398042.a98hWjBeFo@vostro.rjw.lan>
Date:	Tue, 17 Mar 2015 15:30:04 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:	"guohanjun@...wei.com" <guohanjun@...wei.com>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Olof Johansson <olof@...om.net>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <Mark.Rutland@....com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	"jcm@...hat.com" <jcm@...hat.com>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Mark Brown <broonie@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Timur Tabi <timur@...eaurora.org>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	Zhangdianfang <zhangdianfang@...wei.com>
Subject: Re: [update][PATCH v10 06/21] ACPI / sleep: Introduce CONFIG_ACPI_GENERIC_SLEEP

On Tuesday, March 17, 2015 12:35:36 PM Lorenzo Pieralisi wrote:
> On Tue, Mar 17, 2015 at 03:23:11AM +0000, Rafael J. Wysocki wrote:
> 
> [...]
> 
> > > Do you mean remove CONFIG_ACPI_GENERIC_SLEEP and
> > > 
> > > +acpi-$(CONFIG_ACPI_SLEEP) += sleep.o
> > > 
> > > as well (also need to remove duplicate #ifdef CONFIG_ACPI_SLEEP in sleep.c if
> > > we doing so)?
> > 
> > Well, almost.  There is one problem with that, becuase sleep.c contains code
> > outside of the ACPI_SLEEP-dependent blocks.  That code is used for powering
> > off ACPI platforms.
> > 
> > I guess you don't want that code on ARM too, right?
> > 
> > Perhaps we can use ACPI_REDUCED_HARDWARE_ONLY for that?  ARM64 will be the
> > only arch setting it at least for the time being, is that correct?
> 
> HW reduced only platforms are still required to support sleep
> states that on arm64 are totally meaningless at present, so I do
> not think ACPI_REDUCED_HARDWARE_ONLY will cut it.
> 
> Factoring out power_off methods from sleep.c ? I know, it is not nicer
> since you split the S-states management in multiple files.
> 
> Side note: is the acpi_suspend() function in sleep.c used in the kernel ?

No, it isn't.  I've just sent a patch to drop it.


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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