>>> module_init : RUN Time Optimization. Executed when the associated module is loaded. If the module is statically included in the kernel, the kernel can free the module_init routine right at the boot time, after it runs.
>>> module_exit: LINK Time Optimization. It is never executed if the modules are statically included in the kernel. In such cases, it is not needed to include module_exit routines into the kernel image and are discarded at Link Time.
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