struct task_struct *kthread_create(int (*threadfn)(void *data), void *data, const char namefmt[], ...);  kernel thread可以用kernel_thread创建，但是在执行函数里面必须用daemonize释放资源并挂到init下，还需要用completion等待这一过程的完成。为了简化操作，定义了kthread_create。

struct task_struct *kthread_run(int (*threadfn)(void *data),void *data,const char *namefmt, ...);它实际上是个宏，由kthread_create()和wake_up_process()组成。

#define kthread_run(threadfn, data, namefmt, ...)                     / ({                                                            /     struct task_struct *__k                                        /            = kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); /     if (!IS_ERR(__k))                                        /            wake_up_process(__k);                                /     __k;                                                     / })

int kthread_stop(struct task_struct *thread);

#include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/sched.h>   //wake_up_process() #include <linux/kthread.h> //kthread_create(),kthread_run() #include <linux/err.h> //IS_ERR(),PTR_ERR() #ifndef SLEEP_MILLI_SEC #define SLEEP_MILLI_SEC(nMilliSec)\ do { \ long timeout = (nMilliSec) * HZ / 1000; \ while(timeout > 0) \ { \ timeout = schedule_timeout(timeout); \ } \ }while(0); #endif static struct task_struct *my_task = NULL; static int my_kthread(void *data)  {      char *mydata = kmalloc(strlen(data)+1,GFP_KERNEL);     memset(mydata,'\0',strlen(data)+1);     strncpy(mydata,data,strlen(data));     while(!kthread_should_stop())     {         SLEEP_MILLI_SEC(1000);         printk("%s\n",mydata);     }     kfree(mydata);     return 0; }  static int __init kernel_thread_init(void) {     int err;     printk(KERN_ALERT "Kernel thread initalizing...\n");     my_task = kthread_create(my_kthread,"hello world","mythread");     if(IS_ERR(my_task)){         printk("Unable to start kernel thread./n");         err = PTR_ERR(my_task);         my_task = NULL;         return err;     }     wake_up_process(my_task);     return 0;#include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/sched.h>   //wake_up_process() #include <linux/kthread.h> //kthread_create(),kthread_run() #include <linux/err.h> //IS_ERR(),PTR_ERR() #ifndef SLEEP_MILLI_SEC #define SLEEP_MILLI_SEC(nMilliSec)\ do { \ long timeout = (nMilliSec) * HZ / 1000; \ while(timeout > 0) \ { \ timeout = schedule_timeout(timeout); \ } \ }while(0); #endif static struct task_struct *my_task = NULL; static int my_kthread(void *data)  {      char *mydata = kmalloc(strlen(data)+1,GFP_KERNEL);     memset(mydata,'\0',strlen(data)+1);     strncpy(mydata,data,strlen(data));     while(!kthread_should_stop())     {         SLEEP_MILLI_SEC(1000);         printk("%s\n",mydata);     }     kfree(mydata);     return 0; }  static int __init kernel_thread_init(void) {     int err;     printk(KERN_ALERT "Kernel thread initalizing...\n");     my_task = kthread_create(my_kthread,"hello world","mythread");     if(IS_ERR(my_task)){         printk("Unable to start kernel thread./n");         err = PTR_ERR(my_task);         my_task = NULL;         return err; } static void __exit kernel_thread_exit(void) {     if(my_task){         printk(KERN_ALERT "Cancel this kernel thread.\n");         kthread_stop(my_task);         printk(KERN_ALERT "Canceled.\n");         } } module_init(kernel_thread_init); module_exit(kernel_thread_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("anonymous");