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SubjectRe: [PATCH v1 00/10] cpufreq: Add flag to auto-register as cooling device
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.
+
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
- 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 :(

--
viresh

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