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static int __init my_init( void )
{
    int retval;
    pr_info("Timer module loaded\n");

    timer_setup(&my_timer, my_timer_callback, 0);
    pr_info( "Setup timer to fire in 300ms (%ld)\n", jiffies );

    retval = mod_timer( &my_timer, jiffies + msecs_to_jiffies(300) );
    if (retval)
        pr_info("Timer firing failed\n");
 
    return 0;
}