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
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