linux per cpu 变量

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include

#define err(msg) printk(KERN_INFO "%s", msg)

static DEFINE_PER_CPU(int, count);

static int main_init(void)
{
        int *p = &get_cpu_var(count);
        printk(KERN_INFO "%d\n", *p);
        put_cpu_var(count);

        get_cpu_var(count)++;
        put_cpu_var(count);

        p = &get_cpu_var(count);
        printk(KERN_INFO "%d\n", *p);
        put_cpu_var(count);


        return 0;
}

static void main_exit(void)
{
}

module_init(main_init);
module_exit(main_exit);
MODULE_LICENSE("GPL");