17.5.5. init_module
init_module and cleanup_module are an older alternative to the module_init and module_exit macros:
insmod init_module.ko rmmod init_module
Dmesg output:
init_module cleanup_module
Source: kernel_modules/init_module.c
TODO why were module_init and module_exit created? https://stackoverflow.com/questions/3218320/what-is-the-difference-between-module-init-and-init-module-in-a-linux-kernel-mod