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SubjectRe: [PATCH v1 00/10] cpufreq: Add flag to auto-register as cooling device
On Thu, Jan 17, 2019 at 11:21 AM Viresh Kumar <viresh.kumar@linaro.org> wrote:
>
> On 17-01-19, 11:08, Rafael J. Wysocki wrote:
> > On Thu, Jan 17, 2019 at 6:49 AM Viresh Kumar <viresh.kumar@linaro.org> wrote:
> > > 1. Have following for CONFIG_CPU_FREQ
> > > depends on !CPU_THERMAL || THERMAL
> >
> > Sorry, but this makes my teeth hurt.
>
> I knew it :)
>
> > > The platforms which don't need CPU_THERMAL (like x86) should not
> > > enable CPU_THERMAL anymore if they want CONFIG_THERMAL=m.
> > >
> > > @amit: If this gets accepted, please update the Kconfig entries for
> > > all those drivers to not have above lines anymore.
> > >
> > > - Change CONFIG_THERMAL to bool instead of tristate ?
> > >
> > > - Anything else ?
> >
> > The design in the thermal subsystem seems to be upside-down.
> > Non-modular code should never be made depend on anything only defined
> > in a module.
> >
> > Would an explicit "select THERMAL" under CPU_THERMAL cause THERMAL to be 'y'?
>
> That causes recursive-dependency issues:
>
> drivers/thermal/Kconfig:5:error: recursive dependency detected!
> drivers/thermal/Kconfig:5: symbol THERMAL is selected by CPU_THERMAL
> drivers/thermal/Kconfig:16: symbol CPU_THERMAL depends on THERMAL_OF
> drivers/thermal/Kconfig:70: symbol THERMAL_OF depends on THERMAL
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
>
> something like this works though:
>
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 30323426902e..ee9f9f2a795b 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -13,6 +13,20 @@ menuconfig THERMAL
> All platforms with ACPI thermal support can use this driver.
> If you want this support, you should say Y or M here.
>
> +config CPU_THERMAL
> + bool "generic cpu cooling support"
> + depends on CPU_FREQ
> + select THERMAL_OF
> + select THERMAL
> + help
> + This implements the generic cpu cooling mechanism through frequency
> + reduction. An ACPI version of this already exists
> + (drivers/acpi/processor_thermal.c).
> + This will be useful for platforms using the generic thermal interface
> + and not the ACPI interface.
> +
> + If you want this support, you should say Y here.
> +

My sort of educated guess is that it is under the "if THERMAL" so that
it doesn't show up at all when THERMAL is unset.

> if THERMAL
>
> config THERMAL_STATISTICS
> @@ -148,19 +162,6 @@ config THERMAL_GOV_POWER_ALLOCATOR
> Enable this to manage platform thermals by dynamically
> allocating and limiting power to devices.
>
> -config CPU_THERMAL
> - bool "generic cpu cooling support"
> - depends on CPU_FREQ

But what about adding

depends on THERMAL=y

here as I said in the other message?

> - depends on THERMAL_OF
> - help
> - This implements the generic cpu cooling mechanism through frequency
> - reduction. An ACPI version of this already exists
> - (drivers/acpi/processor_thermal.c).
> - This will be useful for platforms using the generic thermal interface
> - and not the ACPI interface.
> -
> - If you want this support, you should say Y here.
> -
> config CLOCK_THERMAL
> bool "Generic clock cooling support"
> depends on COMMON_CLK
>
>
> What about make CONFIG_THERMAL bool instead ? Who wants it to be a module ?
>
> $ git grep "CONFIG_THERMAL=m"
> arch/arm/configs/mini2440_defconfig:CONFIG_THERMAL=m
> arch/arm/configs/omap2plus_defconfig:CONFIG_THERMAL=m
> arch/arm/configs/pxa_defconfig:CONFIG_THERMAL=m
> arch/mips/configs/ip22_defconfig:CONFIG_THERMAL=m
> arch/mips/configs/ip27_defconfig:CONFIG_THERMAL=m
> arch/unicore32/configs/unicore32_defconfig:#CONFIG_THERMAL=m
>
> Not sure if they really want this code out :(

Me neither.

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