x86: make irq_cpustat_t fields conditional

Impact: shrink size of irq_cpustat_t when possible
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

arch/x86/include/asm/hardirq.h

@@ -7,14 +7,22 @@
 typedef struct {
 	unsigned int __softirq_pending;
 	unsigned int __nmi_count;	/* arch dependent */
-	unsigned int apic_timer_irqs;	/* arch dependent */
 	unsigned int irq0_irqs;
+#ifdef CONFIG_X86_LOCAL_APIC
+	unsigned int apic_timer_irqs;	/* arch dependent */
+	unsigned int irq_spurious_count;
+#endif
+#ifdef CONFIG_SMP
 	unsigned int irq_resched_count;
 	unsigned int irq_call_count;
 	unsigned int irq_tlb_count;
+#endif
+#ifdef CONFIG_X86_MCE
 	unsigned int irq_thermal_count;
-	unsigned int irq_spurious_count;
+# ifdef CONFIG_X86_64
 	unsigned int irq_threshold_count;
+# endif
+#endif
 } ____cacheline_aligned irq_cpustat_t;
 
 DECLARE_PER_CPU(irq_cpustat_t, irq_stat);