-extern void (*sparc_init_timers)(irqreturn_t (*lvl10_irq)(int, void *, struct pt_regs *));
-extern void claim_ticker14(irqreturn_t (*irq_handler)(int, void *, struct pt_regs *),
+extern void (*sparc_init_timers)(irq_handler_t lvl10_irq);
+extern void claim_ticker14(irq_handler_t irq_handler,