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Commit e262a7ba authored by Richard Kennedy's avatar Richard Kennedy Committed by Ingo Molnar
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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: default avatarRichard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent ed313489

include/linux/irq.h

+2 −2
Original line number Diff line number Diff line
@@ -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;