On Tue, Oct 7, 2014 at 7:28 AM, Guenter Roeck [off-list ref] wrote:

+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);

Doesn't %ps work to look up symbols?

pr_warn("Poweroff function already registered (%ps), cannot register
%ps\n", poweroff_handler_data.handler, handler);

+               return -EBUSY;
+       }

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds