On 2015/3/17 11:23, Rafael J. Wysocki wrote:

On Tuesday, March 17, 2015 10:36:47 AM Hanjun Guo wrote:

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On 2015/3/17 10:28, Rafael J. Wysocki wrote:

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On Tuesday, March 17, 2015 09:08:45 AM Hanjun Guo wrote:

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On 2015/3/17 7:15, Rafael J. Wysocki wrote:

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On Monday, March 16, 2015 08:14:52 PM Hanjun Guo wrote:

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On 2015?03?14? 05:49, Rafael J. Wysocki wrote:

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On Friday, March 13, 2015 04:14:29 PM Hanjun Guo wrote:

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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.

Well, so what about selecting ACPI_SLEEP from the architectures that use it?

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?

Yes, you are right.

Perhaps we can use ACPI_REDUCED_HARDWARE_ONLY for that?  ARM64 will be the

Sorry, I can't fully understand your intention here, could you please
explain it more?

Let me guess a little bit. Do you mean use ACPI_REDUCED_HARDWARE_ONLY for
powering off ACPI platforms? if so, I guess it's not a good idea, ACPI spec
only says that S4BIOS is not supported on HW-reduced ACPI platforms, S5
has no such limitation, if I miss something here, please let me know.

only arch setting it at least for the time being, is that correct?

That's pretty sure for now.

Thanks
Hanjun