1 files changed, 55 insertions, 22 deletions

diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c
index 3f1372eb0091..3d09062f4682 100644
--- a/arch/sh/kernel/irq.c
+++ b/arch/sh/kernel/irq.c
@@ -31,39 +31,64 @@ void ack_bad_irq(unsigned int irq)
 }
 
 #if defined(CONFIG_PROC_FS)
+/*
+ * /proc/interrupts printing:
+ */
+static int show_other_interrupts(struct seq_file *p, int prec)
+{
+        seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
+        return 0;
+}
+
 int show_interrupts(struct seq_file *p, void *v)
 {
-        int i = *(loff_t *) v, j;
-        struct irqaction * action;
-        unsigned long flags;
+        unsigned long flags, any_count = 0;
+        int i = *(loff_t *)v, j, prec;
+        struct irqaction *action;
+        struct irq_desc *desc;
+
+        if (i > nr_irqs)
+                return 0;
+
+        for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
+                j *= 10;
+
+        if (i == nr_irqs)
+                return show_other_interrupts(p, prec);
 
         if (i == 0) {
-                seq_puts(p, "           ");
+                seq_printf(p, "%*s", prec + 8, "");
                 for_each_online_cpu(j)
-                        seq_printf(p, "CPU%d       ",j);
+                        seq_printf(p, "CPU%-8d", j);
                 seq_putc(p, '\n');
         }
 
-        if (i < sh_mv.mv_nr_irqs) {
-                spin_lock_irqsave(&irq_desc[i].lock, flags);
-                action = irq_desc[i].action;
-                if (!action)
-                        goto unlock;
-                seq_printf(p, "%3d: ",i);
-                for_each_online_cpu(j)
-                        seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
-                seq_printf(p, " %14s", irq_desc[i].chip->name);
-                seq_printf(p, "-%-8s", irq_desc[i].name);
-                seq_printf(p, "  %s", action->name);
+        desc = irq_to_desc(i);
+        if (!desc)
+                return 0;
+
+        spin_lock_irqsave(&desc->lock, flags);
+        for_each_online_cpu(j)
+                any_count |= kstat_irqs_cpu(i, j);
+        action = desc->action;
+        if (!action && !any_count)
+                goto out;
+
+        seq_printf(p, "%*d: ", prec, i);
+        for_each_online_cpu(j)
+                seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
+        seq_printf(p, " %14s", desc->chip->name);
+        seq_printf(p, "-%-8s", desc->name);
 
-                for (action=action->next; action; action = action->next)
+        if (action) {
+                seq_printf(p, "  %s", action->name);
+                while ((action = action->next) != NULL)
                         seq_printf(p, ", %s", action->name);
-                seq_putc(p, '\n');
-unlock:
-                spin_unlock_irqrestore(&irq_desc[i].lock, flags);
-        } else if (i == sh_mv.mv_nr_irqs)
-                seq_printf(p, "Err: %10u\n", atomic_read(&irq_err_count));
+        }
 
+        seq_putc(p, '\n');
+out:
+        spin_unlock_irqrestore(&desc->lock, flags);
         return 0;
 }
 #endif
@@ -254,3 +279,11 @@ void __init init_IRQ(void)
 
         irq_ctx_init(smp_processor_id());
 }
+
+#ifdef CONFIG_SPARSE_IRQ
+int __init arch_probe_nr_irqs(void)
+{
+        nr_irqs = sh_mv.mv_nr_irqs;
+        return 0;
+}
+#endif