parisc: Count IPI function call interrupts

Like other platforms, count the number of IPI function call interrupts
and show it in /proc/interrupts.
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/include/asm/hardirq.h

@@ -22,6 +22,7 @@ typedef struct {
 	unsigned int irq_stack_usage;
 #ifdef CONFIG_SMP
 	unsigned int irq_resched_count;
+	unsigned int irq_call_count;
 #endif
 	unsigned int irq_unaligned_count;
 	unsigned int irq_fpassist_count;

arch/parisc/kernel/irq.c

@@ -180,6 +180,10 @@ int arch_show_interrupts(struct seq_file *p, int prec)
 		for_each_online_cpu(j)
 			seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
 		seq_puts(p, "  Rescheduling interrupts\n");
+		seq_printf(p, "%*s: ", prec, "CAL");
+		for_each_online_cpu(j)
+			seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
+		seq_puts(p, "  Function call interrupts\n");
 	}
 #endif
 	seq_printf(p, "%*s: ", prec, "UAH");

arch/parisc/kernel/smp.c

@@ -155,6 +155,7 @@ ipi_interrupt(int irq, void *dev_id)
 
 			case IPI_CALL_FUNC:
 				smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC\n", this_cpu);
+				inc_irq_stat(irq_call_count);
 				generic_smp_call_function_interrupt();
 				break;