On Tue, Mar 7, 2023 at 2:28 AM Thomas Zimmermann [off-list ref] wrote:

quoted

So after module_init is finished, mode_option_buf[] no longer exists?

Does the __init attribute on a function affect the static variables in
that function?

That is an excellent question.

https://stackoverflow.com/questions/64558614/what-happens-to-local-static-identifiers-in-init-function

I don't think the compiler is naturally aware of whatever section a
variable or function is placed in, so it can't really know that
mode_option_buf[] is suppose to have a limited lifetime.

Either way, the code seems wrong.  If mode_option_buf[] is marked as
__initdata, then it will disappear before the probe() function is
called.

If mode_option_buf[] remains resident, then we are wasting 256 bytes.