Re: [PATCH v2] drm/sitronix: move tiny Sitronix drivers to their own subdir

[Javier Martinez Canillas <javierm@redhat.com>]

Thomas Zimmermann <tzimmermann@suse.de> writes:

> Hi Javier, Marcus
>
> Am 05.05.25 um 11:27 schrieb Javier Martinez Canillas:
>> Thomas Zimmermann <tzimmermann@suse.de> writes:
>>
>> Hello Thomas,
>>
>>> Hi,
>>>
>>> there's one major issue here. You must not change the Kconfig symbols or
>>> you'll break kernel updates for a lot of people. So those TINYDRM_* must
>>> remain as is.
>>>
>> I disagree. The https://docs.kernel.org/admin-guide/abi.html document
>> explictly states that Kconfig symbols are not an ABI, and userspace
>> should not rely on these not changing over time.
>
> To summarize our discussion on irc [1]: changing the symbols is ok, but 
> we should make it compatible to ease the transition. To do so, the new 
> Kconfig file can still contain the old Kconfig symbol and the new one 
> defaults to it. Something like this:
>
> config TINYDRM_ST7586
>    tristate
>    default n
>
> config DRM_ST7586
>    tristate "bla bla"
>    ...
>    default TINYDRM_ST7586
>
> Doing 'make olddefconfig' or a similar make command sets the new symbol 
> from the pre-existing one. After a few releases the old symbol can be 
> removed.
>

That makes sense to me, yes. I'm not against making the life of distro
maintainers easier. We can then drop these transition symbols after a
few kernel releases.

> Best regards
> Thomas
>
>
> [1] 
> https://people.freedesktop.org/~cbrill/dri-log/?channel=dri-devel&highlight_names=&date=2025-05-05&show_html=true
>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat