Re: [PATCH 4/5] s390/idle: Introduce cpuidle for s390

[Christian Loehle <christian.loehle@arm.com>]

On 6/9/26 08:52, Mete Durlu wrote:
> Introduce generic cpuidle driver on s390. Use a two stage approach to
> handle idle scenarios and use TEO governor for idle stage selection.
> Two stages are, from shallow to deep, idle polling and enabled wait.
> 
> Suggested-by: Christian Borntraeger <borntraeger@linux.ibm.com>
> Suggested-by: Heiko Carstens <hca@linux.ibm.com>
> Signed-off-by: Mete Durlu <meted@linux.ibm.com>
> ---
>  arch/s390/Kconfig              |   5 ++
>  drivers/cpuidle/Kconfig        |   5 ++
>  drivers/cpuidle/Kconfig.s390   |  12 ++++
>  drivers/cpuidle/Makefile       |   4 ++
>  drivers/cpuidle/cpuidle-s390.c | 104 +++++++++++++++++++++++++++++++++
>  5 files changed, 130 insertions(+)
>  create mode 100644 drivers/cpuidle/Kconfig.s390
>  create mode 100644 drivers/cpuidle/cpuidle-s390.c
> 
> diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
> index ecbcbb781e40..8548f5b6b247 100644
> --- a/arch/s390/Kconfig
> +++ b/arch/s390/Kconfig
> @@ -20,6 +20,9 @@ config ARCH_HAS_ILOG2_U64
>  config ARCH_PROC_KCORE_TEXT
>  	def_bool y
>  
> +config ARCH_HAS_CPU_RELAX
> +	def_bool y
> +
>  config GENERIC_HWEIGHT
>  	def_bool !HAVE_MARCH_Z196_FEATURES
>  
> @@ -708,6 +711,8 @@ config KERNEL_IMAGE_BASE
>  
>  endmenu
>  
> +source "drivers/cpuidle/Kconfig"
> +
>  menu "Memory setup"
>  
>  config ARCH_SPARSEMEM_ENABLE
> diff --git a/drivers/cpuidle/Kconfig b/drivers/cpuidle/Kconfig
> index d6d8386d3f02..00e2562041fd 100644
> --- a/drivers/cpuidle/Kconfig
> +++ b/drivers/cpuidle/Kconfig
> @@ -71,6 +71,11 @@ depends on RISCV
>  source "drivers/cpuidle/Kconfig.riscv"
>  endmenu
>  
> +menu "S390 CPU Idle Drivers"
> +depends on S390
> +source "drivers/cpuidle/Kconfig.s390"
> +endmenu
> +
>  config HALTPOLL_CPUIDLE
>  	tristate "Halt poll cpuidle driver"
>  	depends on X86 && KVM_GUEST
> diff --git a/drivers/cpuidle/Kconfig.s390 b/drivers/cpuidle/Kconfig.s390
> new file mode 100644
> index 000000000000..e51704a9304c
> --- /dev/null
> +++ b/drivers/cpuidle/Kconfig.s390
> @@ -0,0 +1,12 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +#
> +# S390 CPU Idle drivers
> +#
> +
> +config S390_CPUIDLE
> +	bool "S390 CPU idle driver"
> +	default y
> +	help
> +          Select this option to enable processor idle state management
> +          through cpuidle subsystem.
> +
NIT:
git complains about the trailing blank line here.