Re: [PATCH] ACPI: introduce CONFIG_ACPI_REDUCED_HARDWARE_ONLY to enforce this ACPI mode

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On Thursday 16 January 2014, Al Stone wrote:
> On 01/14/2014 02:26 PM, Arnd Bergmann wrote:
> > On Tuesday 14 January 2014 13:37:02 al.stone@xxxxxxxxxx wrote:
> >> +config ACPI_REDUCED_HARDWARE_ONLY
> >> +       bool "Hardware-reduced ACPI support only"
> >> +       def_bool n
> >> +       depends on ACPI && EXPERT
> >
> > I think this will cause a Kconfig warning if you try to select this
> > on ARM64 without turning on EXPERT as well.
> >
> > It should be ok if you express it as
> >
> > config ACPI_REDUCED_HARDWARE_ONLY
> >         bool "Hardware-reduced ACPI support only" if EXPERT
> >         def_bool n
> >         depends on ACPI
> >
> >
> >       Arnd
> >
> 
> I am very puzzled.  I went back and re-did my configs from
> before, tried a few new ones, and tried with both expressions
> above, but I could not get a Kconfig warning.  Do you have an
> example .config that shows the warning?
> 

I don't have a source tree that allows turning on ACPI on arm64
to easily test this. To clarify: the warning will only happen if
you also add this piece to arch/arm64/Kconfig:

	select ACPI_REDUCED_HARDWARE_ONLY if ACPI

	Arnd
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