[IA64] pvops: preparation: remove extern in irq_ia64.c

remove extern declaration of handle_IPI() in irq_ia64.c.
Instead, declare it in asm-ia64/smp.h.
Later handle_IPI() will be referenced from another file.
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/irq_ia64.c

@@ -600,7 +600,6 @@ static irqreturn_t dummy_handler (int irq, void *dev_id)
 {
 	BUG();
 }
-extern irqreturn_t handle_IPI (int irq, void *dev_id);
 
 static struct irqaction ipi_irqaction = {
 	.handler =	handle_IPI,

include/asm-ia64/smp.h

@@ -15,6 +15,7 @@
 #include <linux/kernel.h>
 #include <linux/cpumask.h>
 #include <linux/bitops.h>
+#include <linux/irqreturn.h>
 
 #include <asm/io.h>
 #include <asm/param.h>
@@ -123,6 +124,7 @@ extern void __init smp_build_cpu_map(void);
 extern void __init init_smp_config (void);
 extern void smp_do_timer (struct pt_regs *regs);
 
+extern irqreturn_t handle_IPI(int irq, void *dev_id);
 extern void smp_send_reschedule (int cpu);
 extern void lock_ipi_calllock(void);
 extern void unlock_ipi_calllock(void);