Hi! > +/** > + * register_poweroff_handler_simple - Register function to be called to power off > + * the system > + * @handler: Function to be called to power off the system > + * @priority: Handler priority. For priority guidelines see > + * register_poweroff_handler. > + * > + * This is a simplified version of register_poweroff_handler. It does not > + * take a notifier as argument, but a function pointer. The function > + * registers a poweroff handler with specified priority. Poweroff > + * handlers registered with this function can not be unregistered, > + * and only a single poweroff handler can be installed using it. > + * > + * This function must not be called from modules and is therefore > + * not exported. > + * > + * Returns -EBUSY if a poweroff handler has already been registered > + * using register_poweroff_handler_simple. Otherwise returns zero, > + * since atomic_notifier_chain_register() currently always returns zero. > + */ > +int register_poweroff_handler_simple(void (*handler)(void), int priority) > +{ > + char symname[KSYM_NAME_LEN]; > + > + if (poweroff_handler_data.handler) { > + lookup_symbol_name((unsigned long)poweroff_handler_data.handler, > + symname); > + pr_warn("Poweroff function already registered (%s)", symname); > + lookup_symbol_name((unsigned long)handler, symname); > + pr_cont(", cannot register %s\n", symname); > + return -EBUSY; > + } Dunno, are you maybe overdoing the debugging infrastructure a bit? This is not going to happen in production, and if it does happen, developer can look the symbol name himself. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html