[PATCH v4 1/6] powercap: Add generic zone hierarchy creation helpers

[Daniel Lezcano]

Hi Lukasz,

thanks for the review


On 10/30/26 15:02, Lukasz Luba wrote:
> 
> 
> On 10/29/26 16:56, Daniel Lezcano wrote:
>> Powercap controllers may need to create several powercap zones organized
>> as a hierarchy. At present, each controller has to open-code the
>> hierarchy traversal, parent lookup, error rollback and reverse-order
>> destruction.
>>
>> Introduce struct powercap_hierarchy to describe a powercap
>> hierarchy. Each node contains its name, parent, backend-specific data
>> and the powercap zone created for it.
> 
> [snip]
> 
>>
>> Cc: Manaf Meethalavalappu Pallikunhi <manaf.pallikunhi at oss.qualcomm.com>
>> Link: https://patch.msgid.link/20260806110159.69690-2- 
>> daniel.lezcano at oss.qualcomm.com
>> Signed-off-by: Daniel Lezcano <daniel.lezcano at oss.qualcomm.com>
>> ---
>> Changes in v4 (since v3):
>> - Rebase on v7.3; no code or commit-description changes.
>>
>> Changes in v3 (since v2):
>> - Rebase on v7.3-rc7.
>> - Add a static initializer and clarify hierarchy ownership and locking.
>> - Check for existing zones and validate names and parent ordering before
>>    creation; use zone for the runtime pointer member.
>> - Allow NULL callback results to skip branches; keep errors fatal.
>> - Use explicit locking and a signed reverse-loop index.
>> - Explain the controller callbacks, their arguments and their 
>> relationship
>>    to zone operations; update the description.
>>
>>   drivers/powercap/powercap_sys.c | 204 +++++++++++++++++++++++++++++++
>>   include/linux/powercap.h        | 205 ++++++++++++++++++++++++++++++++
>>   2 files changed, 409 insertions(+)
>>
> Reviewed-by: Lukasz Luba <lukasz.luba at arm.com>