linux timer

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/version.h>

MODULE_DESCRIPTION("Hello World !!");
MODULE_AUTHOR("jimmy");
MODULE_LICENSE("GPL");


static struct timer_list haha_timer;

static int haha = 0;
static void haha_timer_func(void){
    printk(KERN_ERR"haha timer=%d    jiffies=%ld\n",haha++,jiffies);
    mod_timer(&haha_timer, jiffies + 1*HZ); 
}

static int __init hello_init(void)
{
    printk(KERN_ERR"Hello, world\n");
   
    init_timer(&haha_timer);
    haha_timer.function = haha_timer_func;
    haha_timer.expires  = jiffies + 1*HZ;
    add_timer(&haha_timer); 
  
    return 0;
}

static void __exit hello_exit(void)
{
    printk(KERN_ERR"Goodbye\n");
}

module_init(hello_init);
module_exit(hello_exit);











makefile:


PWD         := $(shell pwd)
KERNEL_DIR   = /home/jimmychen/work/git/ws/linux-3.10.1

MODULE_NAME  = time
obj-m       := $(MODULE_NAME).o

all:
        make -C $(KERNEL_DIR) M=$(PWD) modules
clean:
        make -C $(KERNEL_DIR) M=$(PWD) clean