Blackfin arch: Add ability to count and display number of NMI interrupts

Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

2 files changed, 8 insertions, 1 deletions

diff --git a/arch/blackfin/include/asm/pda.h b/arch/blackfin/include/asm/pda.h
index bd8d4a7efeb2..a67142740df0 100644
--- a/arch/blackfin/include/asm/pda.h
+++ b/arch/blackfin/include/asm/pda.h
@@ -59,6 +59,7 @@ struct blackfin_pda {			/* Per-processor Data Area */
         unsigned long icplb_fault_addr;
         unsigned long retx;
         unsigned long seqstat;
+        unsigned int __nmi_count;       /* number of times NMI asserted on this CPU */
 };
 
 extern struct blackfin_pda cpu_pda[];
diff --git a/arch/blackfin/kernel/irqchip.c b/arch/blackfin/kernel/irqchip.c
index ab8209cbbad0..75724eee6494 100644
--- a/arch/blackfin/kernel/irqchip.c
+++ b/arch/blackfin/kernel/irqchip.c
@@ -35,6 +35,7 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <asm/trace.h>
+#include <asm/pda.h>
 
 static atomic_t irq_err_count;
 static spinlock_t irq_controller_lock;
@@ -91,8 +92,13 @@ int show_interrupts(struct seq_file *p, void *v)
                 seq_putc(p, '\n');
  skip:
                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
-        } else if (i == NR_IRQS)
+        } else if (i == NR_IRQS) {
+                seq_printf(p, "NMI: ");
+                for_each_online_cpu(j)
+                        seq_printf(p, "%10u ", cpu_pda[j].__nmi_count);
+                seq_printf(p, "     CORE  Non Maskable Interrupt\n");
                 seq_printf(p, "Err: %10u\n",  atomic_read(&irq_err_count));
+        }
         return 0;
 }