Index: linux/arch/i386/kernel/irq.c
diff -u linux/arch/i386/kernel/irq.c:1.1.1.7 linux/arch/i386/kernel/irq.c:1.1.1.7.4.1
--- linux/arch/i386/kernel/irq.c:1.1.1.7	Wed May 12 13:30:47 1999
+++ linux/arch/i386/kernel/irq.c	Tue Jul  6 16:30:07 1999
@@ -139,7 +139,7 @@
 /*
  * Controller mappings for all interrupt sources:
  */
-irq_desc_t irq_desc[NR_IRQS] = { [0 ... NR_IRQS-1] = { 0, &no_irq_type, }};
+irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = { [0 ... NR_IRQS-1] = { 0, &no_irq_type, }};
 
 
 /*
Index: linux/arch/i386/kernel/irq.h
diff -u linux/arch/i386/kernel/irq.h:1.1.1.6 linux/arch/i386/kernel/irq.h:1.1.1.6.4.1
--- linux/arch/i386/kernel/irq.h:1.1.1.6	Wed May 12 13:30:47 1999
+++ linux/arch/i386/kernel/irq.h	Tue Jul  6 16:30:07 1999
@@ -40,6 +40,7 @@
 	struct hw_interrupt_type *handler;	/* handle/enable/disable functions */
 	struct irqaction *action;		/* IRQ action list */
 	unsigned int depth;			/* Disable depth for nested irq disables */
+	unsigned int unused[4];
 } irq_desc_t;
 
 /*