[PATCH v2 00/32] driver core: Constify API device_find_child() and adapt for various existing usages

[Zijun Hu]

On 2024/12/3 23:34, James Bottomley wrote:
>>> This also enables an incremental migration.
>> change the API prototype from:
>> device_find_child(..., void *data_0, int (*match)(struct device *dev,
>> void *data));
>>
>> to:
>> device_find_child(..., const void *data_0, int (*match)(struct device
>> *dev, const void *data));
>>
>> For @data_0,  void * -> const void * is okay.
>> but for @match, the problem is function pointer type incompatibility.
>>
>> there are two solutions base on discussions.
>>
>> 1) squashing likewise Greg mentioned.
>>    Do all of the "prep work" first, and then
>>    do the const change at the very end, all at once.
>>
>> 2)  as changing platform_driver's remove() prototype.
>> Commit: e70140ba0d2b ("Get rid of 'remove_new' relic from platform
>> driver struct")
>>
>>  introduce extra device_find_child_new() which is constified  -> use
>> *_new() replace ALL device_find_child() instances one by one -> 
>> remove device_find_child() -> rename *_new() to device_find_child()
>> once.
> Why bother with the last step, which churns the entire code base again?

keep the good API name device_find_child().

> Why not call the new function device_find_child_const() and simply keep
> it (it's descriptive of its function).  That way you can have a patch
> series without merging and at the end simply remove the old function.

device_find_child is a good name for the API, 'find' already means const.