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

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Message-ID: <5704037.pUGdJ0Q9hF@vostro.rjw.lan>
Date:	Tue, 17 Mar 2015 00:15:48 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Olof Johansson <olof@...om.net>,
	Grant Likely <grant.likely@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <mark.rutland@....com>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Jon Masters <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, linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linaro-acpi@...ts.linaro.org,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>
Subject: Re: [update][PATCH v10 06/21] ACPI / sleep: Introduce CONFIG_ACPI_GENERIC_SLEEP

On Monday, March 16, 2015 08:14:52 PM Hanjun Guo wrote:
> On 2015年03月14日 05:49, Rafael J. Wysocki wrote:
> > On Friday, March 13, 2015 04:14:29 PM Hanjun Guo wrote:
> >> From: Graeme Gregory <graeme.gregory@...aro.org>
> >>
> >> ACPI 5.1 does not currently support S states for ARM64 hardware but
> >> ACPI code will call acpi_target_system_state() and acpi_sleep_init()
> >> for device power management, so introduce CONFIG_ACPI_GENERIC_SLEEP
> >> and select it for x86 and ia64 only to make sleep functions available,
> >> and also introduce stub function to allow other drivers to function
> >> until S states are defined for ARM64.
> >>
> >> It will be no functional change for x86 and IA64.
> >>
> >> CC: Rafael J. Wysocki <rjw@...ysocki.net>
> >> Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >> Acked-by: Robert Richter <rrichter@...ium.com>
> >> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> >> Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
> >> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
> >> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> >> ---
> >>   arch/ia64/Kconfig       | 1 +
> >>   arch/x86/Kconfig        | 1 +
> >>   drivers/acpi/Kconfig    | 4 ++++
> >>   drivers/acpi/Makefile   | 2 +-
> >>   drivers/acpi/internal.h | 4 ++++
> >>   5 files changed, 11 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
> >> index 074e52b..e8728d7 100644
> >> --- a/arch/ia64/Kconfig
> >> +++ b/arch/ia64/Kconfig
> >> @@ -10,6 +10,7 @@ config IA64
> >>   	select ARCH_MIGHT_HAVE_PC_SERIO
> >>   	select PCI if (!IA64_HP_SIM)
> >>   	select ACPI if (!IA64_HP_SIM)
> >> +	select ACPI_GENERIC_SLEEP if ACPI
> >>   	select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
> >>   	select HAVE_UNSTABLE_SCHED_CLOCK
> >>   	select HAVE_IDE
> >> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> >> index b7d31ca..9804431 100644
> >> --- a/arch/x86/Kconfig
> >> +++ b/arch/x86/Kconfig
> >> @@ -22,6 +22,7 @@ config X86_64
> >>   ### Arch settings
> >>   config X86
> >>   	def_bool y
> >> +	select ACPI_GENERIC_SLEEP if ACPI
> >
> > One more nit.  If you did
> >
> > +	select ACPI_GENERIC_SLEEP if ACPI_SLEEP
> >
> > here (and above for ia64), you'd avoid having to make ACPI_SLEEP
> > depend on ACPI_GENERIC_SLEEP which goes somewhat backwards.
> 
> In sleep.c,
> 
> #ifdef CONFIG_ACPI_SLEEP
> acpi_target_system_state()
> {
> }
> #endif
> 
> and CONFIG_ACPI_SLEEP depends on SUSPEND || HIBERNATION,
> which one of them will be enabled on ARM64 so ACPI_SLEEP
> will also enabled too.
> 
> So if we
> 
> +select ACPI_GENERIC_SLEEP if ACPI_SLEEP
> 
> and
> 
> +acpi-$(CONFIG_ACPI_GENERIC_SLEEP) += sleep.o
> 
> it will lead to errors for acpi_target_system_state() that
> is declared but not defined, so I will keep the code as
> it is, what do you think?

No, we need to hash this out.  Having two different Kconfig options meaning
almost the same thing (ACPI_SLEEP and ACPI_GENERIC_SLEEP) is beyond ugly.

Do you need ACPI_SLEEP on ARM64 at all?


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