#include <my_linux/helloworld.h>

asmlinkage int sys_helloworld(void __user *to, void __user *from, int n)
{
	char temp[100];
	int ret = -1;

        if (n < 80) {
        	copy_from_user(temp, from, n);
		strcat(temp, " from my kernel. ");
		n = strlen(temp);
		ret = copy_to_user(to, temp, n);
  	}
	return ret;
}