Subject: Re: [PATCH v2 2/3] sched: Cleanup SCHED_THERMAL_PRESSURE kconfig entry

From: Valentin Schneider <[email-masked]>
Date: Wed, 29 Jul 2020 14:29:37 +0100

On 29/07/20 14:09, Quentin Perret wrote:
> On Tuesday 28 Jul 2020 at 17:16:57 (+0100), Valentin Schneider wrote:
>> We could change the arch Kconfig into
>>
>>   select SCHED_THERMAL_PRESSURE if CPU_FREQ_THERMAL
>>
>> but that seems redundant; this dependency is already expressed in
>> SCHED_THERMAL_PRESSURE's definition. Is there a proper pattern to select
>> some Kconfig option only if all of its dependencies are met?
>
> How about something like this (totally untested):
>
> ---8<---
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 939c4d6bbc2e..2ac74904a3ce 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -46,7 +46,6 @@ config ARM
>       select EDAC_ATOMIC_SCRUB
>       select GENERIC_ALLOCATOR
>       select GENERIC_ARCH_TOPOLOGY if ARM_CPU_TOPOLOGY
> -	select SCHED_THERMAL_PRESSURE if ARM_CPU_TOPOLOGY
>       select GENERIC_ATOMIC64 if CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI
>       select GENERIC_CLOCKEVENTS_BROADCAST if SMP
>       select GENERIC_CPU_AUTOPROBE
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index c403e6f5db86..66dc41fd49f2 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -192,7 +192,6 @@ config ARM64
>       select PCI_SYSCALL if PCI
>       select POWER_RESET
>       select POWER_SUPPLY
> -	select SCHED_THERMAL_PRESSURE
>       select SPARSE_IRQ
>       select SWIOTLB
>       select SYSCTL_EXCEPTION_TRACE
> diff --git a/init/Kconfig b/init/Kconfig
> index 0a97d85568b2..c2e1f3ac527e 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -493,6 +493,7 @@ config HAVE_SCHED_AVG_IRQ
>
>  config SCHED_THERMAL_PRESSURE
>       bool
> +	default y if ARM64 || ARM_CPU_TOPOLOGY
>       depends on SMP
>       depends on CPU_FREQ_THERMAL
>       help
> --->8---
>

That does seem to do just what I was looking for, thanks!

> Thanks,
> Quentin

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