ACPI] Delete IRQ2 "cascade" in ACPI IOAPIC mode

no such concept exists in ACPI, frees IRQ2 for use.

arch/i386/mach-default/setup.c

@@ -7,6 +7,7 @@
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
+#include <asm/acpi.h>
 #include <asm/arch_hooks.h>
 
 /**
@@ -43,7 +44,8 @@ void __init intr_init_hook(void)
 	apic_intr_init();
 #endif
 
-	setup_irq(2, &irq2);
+	if (!acpi_ioapic)
+		setup_irq(2, &irq2);
 }
 
 /**

arch/i386/mach-es7000/setup.c

@@ -7,6 +7,7 @@
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
+#include <asm/acpi.h>
 #include <asm/arch_hooks.h>
 
 /**
@@ -17,8 +18,7 @@
  *	the "ordinary" interrupt call gates.  For legacy reasons, the ISA
  *	interrupts should be initialised here if the machine emulates a PC
  *	in any way.
- **/
-void __init pre_intr_init_hook(void)
+ **/void __init pre_intr_init_hook(void)
 {
 	init_ISA_irqs();
 }
@@ -43,7 +43,8 @@ void __init intr_init_hook(void)
 	apic_intr_init();
 #endif
 
-	setup_irq(2, &irq2);
+	if (!acpi_ioapic)
+		setup_irq(2, &irq2);
 }
 
 /**

arch/i386/mach-voyager/setup.c

@@ -6,6 +6,7 @@
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
+#include <asm/acpi.h>
 #include <asm/arch_hooks.h>
 
 void __init pre_intr_init_hook(void)
@@ -24,7 +25,8 @@ void __init intr_init_hook(void)
 	smp_intr_init();
 #endif
 
-	setup_irq(2, &irq2);
+	if (!acpi_ioapic)
+		setup_irq(2, &irq2);
 }
 
 void __init pre_setup_arch_hook(void)

arch/x86_64/kernel/i8259.c

@@ -13,6 +13,7 @@
 #include <linux/kernel_stat.h>
 #include <linux/sysdev.h>
 
+#include <asm/acpi.h>
 #include <asm/atomic.h>
 #include <asm/system.h>
 #include <asm/io.h>
@@ -490,5 +491,6 @@ void __init init_IRQ(void)
 	 */
 	setup_timer();
 
-	setup_irq(2, &irq2);
+	if (!acpi_ioapic)
+		setup_irq(2, &irq2);
 }