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

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Message-ID: <55077E9D.50103@huawei.com>
Date:	Tue, 17 Mar 2015 09:08:45 +0800
From:	Hanjun Guo <guohanjun@...wei.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	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 2015/3/17 7:15, Rafael J. Wysocki wrote:
> 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:
[...]
>>>>
>>>> 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?

No, at least for now we don't need it, the spec for sleep is not ready for
ARM64 arch, so ACPI_SLEEP will not work at all on ARM64.

Thanks
Hanjun

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