linux-kernel - Re: [PATCH 0/2] Save cpuhp dynamic state

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Message-ID: <fb5b9767-f676-1098-de9b-b0dc78cda268@arm.com>
Date:   Wed, 1 Feb 2023 17:20:14 +0100
From:   Pierre Gondois <pierre.gondois@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Daniel Lezcano <daniel.lezcano@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Abhyuday Godhasara <abhyuday.godhasara@...inx.com>,
        Michal Simek <michal.simek@...inx.com>,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/2] Save cpuhp dynamic state

Hello Daniel, Abhyuday,
Another ping just in case,

Regards,
Pierre

On 10/6/22 09:54, Pierre Gondois wrote:
> Hello,
> Just a ping in case this was forgotten,
> 
> Regards,
> Pierre
> 
> On 9/14/22 18:28, Pierre Gondois wrote:
>> Requesting a CPUHP_AP_ONLINE_DYN cpuhp state reserves a state
>> among the range [CPUHP_AP_ONLINE_DYN:CPUHP_AP_ONLINE_DYN_END].
>> The reserved state must be saved in order to remove it later.
>>
>> Cf. __cpuhp_setup_state_cpuslocked() documentation:
>> Return:
>>     On success:
>>       Positive state number if @state is CPUHP_AP_ONLINE_DYN;
>>       0 for all other states
>>
>> Indeed, the following:
>>     cpuhp_remove_state(CPUHP_AP_ONLINE_DYN);
>> removes the first dynamic states added to the cpuhp state machine.
>>
>> Patches were tested as:
>> - powercap/drivers/dtpm: on a Juno-r2, using a late_initcall()
>>     to init and exit the dtpm framework.
>> - driver: soc: xilinx: the patch was only compile tested
>>     due to missing hardware.
>>
>> Pierre Gondois (2):
>>     driver: soc: xilinx: Save cpuhp dynamic state
>>     powercap/drivers/dtpm: Save cpuhp dynamic state
>>
>>    drivers/powercap/dtpm_cpu.c             |  7 ++++++-
>>    drivers/soc/xilinx/xlnx_event_manager.c | 12 ++++++++++--
>>    2 files changed, 16 insertions(+), 3 deletions(-)
>>