ARM: SMP: collect IPI and local timer IRQs for /proc/stat

The IPI and local timer interrupts weren't being properly accounted
for in /proc/stat.  Collect them from the irq_stat structure, and
return their sum.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 23 insertions, 0 deletions

diff --git a/arch/arm/include/asm/hardirq.h b/arch/arm/include/asm/hardirq.h
index c52e2507c9e0..89ad1805e579 100644
--- a/arch/arm/include/asm/hardirq.h
+++ b/arch/arm/include/asm/hardirq.h
@@ -22,6 +22,14 @@ typedef struct {
 #define __inc_irq_stat(cpu, member)     __IRQ_STAT(cpu, member)++
 #define __get_irq_stat(cpu, member)     __IRQ_STAT(cpu, member)
 
+#ifdef CONFIG_SMP
+u64 smp_irq_stat_cpu(unsigned int cpu);
+#else
+#define smp_irq_stat_cpu(cpu)   0
+#endif
+
+#define arch_irq_stat_cpu       smp_irq_stat_cpu
+
 #if NR_IRQS > 512
 #define HARDIRQ_BITS    10
 #elif NR_IRQS > 256
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index fa0c5f6e1587..1de3e13a42a1 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -406,6 +406,21 @@ void show_ipi_list(struct seq_file *p, int prec)
         }
 }
 
+u64 smp_irq_stat_cpu(unsigned int cpu)
+{
+        u64 sum = 0;
+        int i;
+
+        for (i = 0; i < NR_IPI; i++)
+                sum += __get_irq_stat(cpu, ipi_irqs[i]);
+
+#ifdef CONFIG_LOCAL_TIMERS
+        sum += __get_irq_stat(cpu, local_timer_irqs);
+#endif
+
+        return sum;
+}
+
 /*
  * Timer (local or broadcast) support
  */