irq.h: remove padding from irq_desc on 64bits

Impact: reduce struct irq_desc size

struct irq_desc: reorder to remove padding on 64bits

shrinks irq_desc to 128 bytes which saves data space & cache lines

On a generic x86_64/SMP build this reduces the reported data size by
64k.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/irq.h b/include/linux/irq.h
index d058c57..838a977 100644 (file)
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -142,8 +142,8 @@ struct irq_chip {
  * @depth:             disable-depth, for nested irq_disable() calls
  * @wake_depth:                enable depth, for multiple set_irq_wake() callers
  * @irq_count:         stats field to detect stalled irqs
- * @irqs_unhandled:    stats field for spurious unhandled interrupts
  * @last_unhandled:    aging timer for unhandled count
+ * @irqs_unhandled:    stats field for spurious unhandled interrupts
  * @lock:              locking for SMP
  * @affinity:          IRQ affinity on SMP
  * @cpu:               cpu index useful for balancing
@@ -165,8 +165,8 @@ struct irq_desc {
        unsigned int            depth;          /* nested irq disables */
        unsigned int            wake_depth;     /* nested wake enables */
        unsigned int            irq_count;      /* For detecting broken IRQs */
-       unsigned int            irqs_unhandled;
        unsigned long           last_unhandled; /* Aging timer for unhandled count */
+       unsigned int            irqs_unhandled;
        spinlock_t              lock;
 #ifdef CONFIG_SMP
        cpumask_t               affinity;