一个内核定时器

根据别人的模块改的，不管怎么样，贴出来，大家指正。

//timer.c

#include
#include
#include
#include
#include

#define MODULE_NAME "MODULE_TIMER .. Maomao 's timer"

#define SUCCESS 0
#define CHECK_INTERVAL 2*HZ

struct timer_list mm_timer;

void mm_runtimer(void);
void mm_timeout(unsigned long ptr);

static int counter=0;

static __init int timer_init(void);
static __exit void timer_exit(void);

void mm_runtimer(void)
{
        init_timer(&mm_timer);
        mm_timer.function = mm_timeout;
        mm_timer.data = counter++;
        mm_timer.expires = jiffies+CHECK_INTERVAL;
        add_timer(&mm_timer);
        return;
}

void mm_timeout(unsigned long ptr)
{
        printk("<0>,timer reach,jiffies=%lu,ptr=%lu\n",jiffies,ptr);
        if(counter<5){
                del_timer(&mm_timer);
                mm_runtimer();
        }
        else{
                printk("<0>%d times reach return\n",counter);
                del_timer(&mm_timer);
                return;
        }
}

static __init int timer_init(void)
{
        mm_runtimer();
        return 0;
}

static __exit void timer_exit(void)
{
        return ;
}

module_init(timer_init);
module_exit(timer_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("mm");