Below is the initialization order from first to last. For details, refer to linux/init.h

1. core_initcall()
2. postcore_initcall()
3. arch_initcall()
4. subsys_initcall()
5. fs_initcall()
6. device_initcall()
7. late_initcall()

module_init(xxxx_init); module_exit(xxxx_exit);