x86: also show non-zero IRQ counts for vectors that currently don't have a handler

It doesn't seem to make sense to hide these, even if their counts
can't change at the point in time they're being displayed.

[ tglx: arch/x86 adaptation ]

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 14 insertions, 4 deletions

diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index 10f359021aae..d3fde94f7345 100644
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -255,9 +255,17 @@ int show_interrupts(struct seq_file *p, void *v)
         }
 
         if (i < NR_IRQS) {
+                unsigned any_count = 0;
+
                 spin_lock_irqsave(&irq_desc[i].lock, flags);
+#ifndef CONFIG_SMP
+                any_count = kstat_irqs(i);
+#else
+                for_each_online_cpu(j)
+                        any_count |= kstat_cpu(j).irqs[i];
+#endif
                 action = irq_desc[i].action;
-                if (!action)
+                if (!action && !any_count)
                         goto skip;
                 seq_printf(p, "%3d: ",i);
 #ifndef CONFIG_SMP
@@ -268,10 +276,12 @@ int show_interrupts(struct seq_file *p, void *v)
 #endif
                 seq_printf(p, " %8s", irq_desc[i].chip->name);
                 seq_printf(p, "-%-8s", irq_desc[i].name);
-                seq_printf(p, "  %s", action->name);
 
-                for (action=action->next; action; action = action->next)
-                        seq_printf(p, ", %s", action->name);
+                if (action) {
+                        seq_printf(p, "  %s", action->name);
+                        while ((action = action->next) != NULL)
+                                seq_printf(p, ", %s", action->name);
+                }
 
                 seq_putc(p, '\n');
 skip: