genirq: Move kstat_incr_irqs_this_cpu() to core

No more users outside the core code. Put it into the poison
cabinet. That also gets rid of the linux/irq.h include in
kernel_stat.h

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140223212739.124207133@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

include/linux/kernel_stat.h

@@ -51,15 +51,7 @@ DECLARE_PER_CPU(struct kernel_cpustat, kernel_cpustat);
 
 extern unsigned long long nr_context_switches(void);
 
-#include <linux/irq.h>
 extern unsigned int kstat_irqs_cpu(unsigned int irq, int cpu);
-
-static inline void kstat_incr_irqs_this_cpu(unsigned int irq, struct irq_desc *desc)
-{
-	__this_cpu_inc(*desc->kstat_irqs);
-	__this_cpu_inc(kstat.irqs_sum);
-}
-
 extern void kstat_incr_irq_this_cpu(unsigned int irq);
 
 static inline void kstat_incr_softirqs_this_cpu(unsigned int irq)

kernel/irq/internals.h

@@ -6,6 +6,7 @@
  * of this file for your non core code.
  */
 #include <linux/irqdesc.h>
+#include <linux/kernel_stat.h>
 
 #ifdef CONFIG_SPARSE_IRQ
 # define IRQ_BITMAP_BITS	(NR_IRQS + 8196)
@@ -180,3 +181,9 @@ static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
 {
 	return d->state_use_accessors & mask;
 }
+
+static inline void kstat_incr_irqs_this_cpu(unsigned int irq, struct irq_desc *desc)
+{
+	__this_cpu_inc(*desc->kstat_irqs);
+	__this_cpu_inc(kstat.irqs_sum);
+}