#include <linux/cdev.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
-#include <linux/sched.h>
+#include <linux/interrupt.h>
MODULE_LICENSE("GPL");
static dev_t devnum;
static struct cdev *dev;
-static const char default_greeting[] = "Hello, World!\n";
+static const char def_greeting[] = "Hello, World!\n";
static DEFINE_SPINLOCK(hello_lock);
return 0;
}
+static void hello_world(unsigned long greeting)
+{
+ printk(KERN_INFO "%s", (char *) greeting);
+}
+
+static DECLARE_TASKLET(hello_tasklet, hello_world, def_greeting);
+
static ssize_t hello_read(struct file *fp, char __user *buf, size_t sz,
loff_t *pos)
{
- unsigned long expire = jiffies + 5 * HZ;
- while (time_after(expire, jiffies))
- cpu_relax();
+ printk(KERN_INFO "Scheduling tasklet...\n");
+ tasklet_schedule(&hello_tasklet);
return 0;
}
static void __exit ch_exit(void)
{
+ tasklet_kill(&hello_tasklet);
cdev_del(dev);
unregister_chrdev_region(devnum, 256);
}