ia64: replace setup_irq() by request_irq()

request_irq() is preferred over setup_irq(). Invocations of setup_irq()
occur after memory allocators are ready.

Per tglx[1], setup_irq() existed in olden days when allocators were not
ready by the time early interrupts were initialized.

Hence replace setup_irq() by request_irq().

Changing 'ia64_native_register_percpu_irq' decleration to include
'irq_handler_t' as an argument type in arch/ia64/include/asm/hw_irq.h
was causing build error - 'unknown type name 'irq_handler_t''

This was due to below header file sequence,
+ include/interrupt.h
 + include/hardirq.h
  + asm/hardirq.h
   + include/irq.h
    + asm/hw_irq.h
       [ 'ia64_native_register_percpu_irq' declared w/ 'irq_handler_t']
 [ 'irq_handler_t' typedef'ed here in 'include/interrupt.h']

'register_percpu_irq' defined to 'ia64_native_register_percpu_irq' is
the one invoked by the caller, not the latter directly. This was done
to support paravirtualization which was removed around 4 years back.
And 'register_percpu_irq' is invoked only inside 'arch/ia64/kernel'.

So 'register_percpu_irq' define to 'ia64_native_register_percpu_irq' is
removed, instead 'ia64_native_register_percpu_irq' is renamed to
'register_precpu_irq()' & it is directly invoked. Also,
'register_precpu_irq()' is declared in a new header file 'irq.h' inside
'arch/ia64/kernel/', this header file is included by C files invoking
'register_percpu_irq()'.

[1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos

Signed-off-by: afzal mohammed <afzal.mohd.ma@gmail.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/perfmon.c

@@ -57,6 +57,8 @@
 #include <linux/uaccess.h>
 #include <asm/delay.h>
 
+#include "irq.h"
+
 #ifdef CONFIG_PERFMON
 /*
  * perfmon context state
@@ -6313,11 +6315,6 @@ pfm_flush_pmds(struct task_struct *task, pfm_context_t *ctx)
 	}
 }
 
-static struct irqaction perfmon_irqaction = {
-	.handler = pfm_interrupt_handler,
-	.name    = "perfmon"
-};
-
 static void
 pfm_alt_save_pmu_state(void *data)
 {
@@ -6591,7 +6588,8 @@ pfm_init_percpu (void)
 	pfm_unfreeze_pmu();
 
 	if (first_time) {
-		register_percpu_irq(IA64_PERFMON_VECTOR, &perfmon_irqaction);
+		register_percpu_irq(IA64_PERFMON_VECTOR, pfm_interrupt_handler,
+				    0, "perfmon");
 		first_time=0;
 	}