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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <5506C93C.704@linaro.org>
Date:	Mon, 16 Mar 2015 20:14:52 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
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?

Thanks
Hanjun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/