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

[Mete Durlu <meted@linux.ibm.com>]

On 6/9/26 10:12, Christian Loehle wrote:
> 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
> 
> Since this will be hard for anybody without the hardware to maintain,
> would you maintain it? Or the existing s390 maintainers?
> If either then please also modify MAINTAINERS to reflect that.


Yes, I'll be maintaining the driver. I am not sure if it should be part
of the patch series but I'll add a new entry like below;

diff --git a/MAINTAINERS b/MAINTAINERS
index e035a3be797c..6b1eaa3abce7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6766,6 +6766,13 @@ L:       linux-riscv@lists.infradead.org
  S:     Maintained
  F:     drivers/cpuidle/cpuidle-riscv-sbi.c

+CPUIDLE DRIVER - S390
+M:     Mete Durlu <meted@linux.ibm.com>
+L:     linux-pm@vger.kernel.org
+L:     linux-s390@vger.kernel.org
+S:     Maintained
+F:     drivers/cpuidle/cpuidle-s390.c
+
  CPUMASK API [RUST]
  M:     Viresh Kumar <viresh.kumar@linaro.org>
  R:     Yury Norov <yury.norov@gmail.com>
@@ -23499,6 +23506,7 @@ F:      Documentation/arch/s390/
  F:     arch/s390/
  F:     drivers/s390/
  F:     drivers/watchdog/diag288_wdt.c
+F:     drivers/cpuidle/cpuidle-s390.c

  S390 COMMON I/O LAYER
  M:     Vineeth Vijayan <vneethv@linux.ibm.com>