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void my_softirq_handler(unsigned long data){
printk(KERN_ALERT "My softirq Handler is executing...\n");
/*printk(KERN_ALERT "Data Received: %L ...\n",++data);*/
}
/*
* hello_init the init function, called when the module is loaded.
* Returns zero if successfully loaded, nonzero otherwise.
*/
static int hello_init(void)
{
printk(KERN_ALERT "Module is up Hello!.\n");
open_softirq(MY_SOFTIRQ, my_softirq_handler, NULL);
raise_softirq(MY_SOFTIRQ);
return 0;
}
/*
* hello_exit the exit function, called when the module is removed.
*/
static void hello_exit(void)
{
printk(KERN_ALERT "Module is down bye bye!\n");
}
module_init(hello_init);
module_exit(hello_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mina");
The ERROR
---------
# insmod mysoftirq.ko
Using mysoftirq.ko
mysoftirq: Unknown symbol open_softirq
insmod: cannot insert `mysoftirq.ko': Unknown symbol in module (-1): No such file or directory
void my_tasklet_handler(unsigned long data){
printk(KERN_ALERT "My Tasklet Handler is executing...\n");
printk(KERN_ALERT "Data Received: %L ...\n",++data);
/*tasklet_schedule(&my_tasklet);*/
}
/*
* hello_init the init function, called when the module is loaded.
* Returns zero if successfully loaded, nonzero otherwise.
*/
static int hello_init(void)
{
printk(KERN_ALERT "Module is up Hello!.\n");
DECLARE_TASKLET(my_tasklet, my_tasklet_handler, data);
tasklet_schedule(&my_tasklet);
return 0;
}
/*
* hello_exit the exit function, called when the module is removed.
*/
static void hello_exit(void)
{
printk(KERN_ALERT "Module is down bye bye!\n");
}
I think tasklets need to be declared outside of the function - if you declare it inside the function, then it's just like you declared "int i;" or something like that - it has no meaning outside the function it's declared in.
/*
* hello_init the init function, called when the module is loaded.
* Returns zero if successfully loaded, nonzero otherwise.
*/
static int hello_init(void)
{
printk(KERN_ALERT "Module is up Hello!.\n");
tasklet_schedule(&my_tasklet);
return 0;
}
/*
* hello_exit the exit function, called when the module is removed.
*/
static void hello_exit(void)
{
printk(KERN_ALERT "Module is down bye bye!\n");
}
module_init(hello_init);
module_exit(hello_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mina");
if you look at the DECLARE_TASKLET macro, it's just a declaration and initialization of the tasklet struct. In my mind at least, it's easier to think of it that way.
I'm not sure what will happen if the modules exits before the tasklet starts execution... let me know what happens .
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