init_module (man9)
init_module, cleanup_module − module load and unload functions
init_module, cleanup_module − module load and unload functions
pcibios_read_config_byte − read one byte of data from the configuration space of the PCI bus
pcibios_read_config_word − read a word of data from the configuration space of the PCI bus
probe_irq_on, probe_irq_off − safe probing for IRQs
wake_up − wake up sleeping processes
kmalloc, kfree − allocate and free pieces of memory
proc_scsi_register, proc_scsi_unregister − register SCSI entries in the /proc filesystem
pcibios_present − determine whether a PCI bus is available
printk − print messages to console log
mem_map_reserve, mem_map_unreserve − Manipulate flags of virtual memory pages.