结构体struct module在内核中代表一个内核模块，通过insmod(实际执行init_module系统调用)把自己编写的内核模块插入内核时，模块便与一个struct module结构体相关联，并成为内核的一部分。下面是结构体struct module的完整定义，接下来会逐个解释：
struct module
{
enum module_state state;
struct list_head list;
char name[MODULE_NAME_LEN];
struct module_kobject mkobj;
struct module_param_attrs *param_attrs;
const char *version;
const char *srcversion;
const struct kernel_symbol *syms;
unsigned int num_syms;
const unsigned long *crcs;
const struct kernel_symbol *gpl_syms;
unsigned int num_gpl_syms;
const unsigned long *gpl_crcs;
unsigned int num_exentries;
const struct exception_table_entry *extable;
int (*init)(void);
void *module_init;
void *module_core;
unsigned long init_size， core_size;
unsigned long init_text_size， core_text_size;
struct mod_arch_specific arch;
int unsafe;
int license_gplok;
#ifdef CONFIG_MODULE_UNLOAD
struct module_ref ref[NR_CPUS];
struct list_head modules_which_use_me;
struct task_struct *waiter;
void (*exit)(void);
#endif
#ifdef CONFIG_KALLSYMS
Elf_Sym *symtab;
unsigned long num_symtab;
char *strtab;
struct module_sect_attrs *sect_attrs;
#endif
void *percpu;
char *args;
};