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

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Message-ID: <1094d467-797b-f795-a486-6d2bae1edcd6@arm.com>
Date:   Thu, 6 Oct 2022 09:54:13 +0200
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,
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(-)
>