ARM: fix /proc/interrupts formatting

As per x86, align the initial column according to how many IRQs we
have.  Also, provide an english explaination for the 'LOC:' and
'IPI:' lines.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 65b5ba8..269237e 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -382,16 +382,16 @@
 	smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
 }
 
-void show_ipi_list(struct seq_file *p)
+void show_ipi_list(struct seq_file *p, int prec)
 {
 	unsigned int cpu;
 
-	seq_puts(p, "IPI:");
+	seq_printf(p, "%*s: ", prec, "IPI");
 
 	for_each_present_cpu(cpu)
-		seq_printf(p, " %10u", __get_irq_stat(cpu, ipi_irqs));
+		seq_printf(p, "%10u ", __get_irq_stat(cpu, ipi_irqs));
 
-	seq_putc(p, '\n');
+	seq_printf(p, " Inter-processor interrupts\n");
 }
 
 /*
@@ -421,16 +421,16 @@
 	set_irq_regs(old_regs);
 }
 
-void show_local_irqs(struct seq_file *p)
+void show_local_irqs(struct seq_file *p, int prec)
 {
 	unsigned int cpu;
 
-	seq_printf(p, "LOC: ");
+	seq_printf(p, "%*s: ", prec, "LOC");
 
 	for_each_present_cpu(cpu)
 		seq_printf(p, "%10u ", __get_irq_stat(cpu, local_timer_irqs));
 
-	seq_putc(p, '\n');
+	seq_printf(p, " Local timer interrupts\n");
 }
 #endif