#kernel #linux #fr #todo #en

Kernel dynamic linker

By default, module have access to no variable or function from the kernel, even if they are not static.

export symbols to modules

EXPORT_SYMBOL(s) // makes s visible to all loaded modules
EXPORT_SYMBOL_GPL(s) // makes s visible to all modules GPL-compatible licensed

You need to declare your symbol extern and load the module where it is defined.