diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 3deced637f07c814706698e6e90a10088aebe889..d0743c6da6d8250a88c61bdfde3375702f315266 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -338,11 +338,6 @@ config IA64_PALINFO
 	  To use this option, you have to ensure that the "/proc file system
 	  support" (CONFIG_PROC_FS) is enabled, too.
 
-config ACPI_DEALLOCATE_IRQ
-	bool
-	depends on IOSAPIC && EXPERIMENTAL
-	default y
-
 source "drivers/firmware/Kconfig"
 
 source "fs/Kconfig.binfmt"
diff --git a/arch/ia64/configs/sn2_defconfig b/arch/ia64/configs/sn2_defconfig
index dccf35c60b941845351262e42e87361993760de3..5f1cceb590cdaee5fbfa498d50852c32536c9691 100644
--- a/arch/ia64/configs/sn2_defconfig
+++ b/arch/ia64/configs/sn2_defconfig
@@ -111,7 +111,6 @@ CONFIG_COMPAT=y
 CONFIG_IA64_MCA_RECOVERY=y
 CONFIG_PERFMON=y
 CONFIG_IA64_PALINFO=y
-CONFIG_ACPI_DEALLOCATE_IRQ=y
 
 #
 # Firmware Drivers
diff --git a/arch/ia64/configs/tiger_defconfig b/arch/ia64/configs/tiger_defconfig
index c853cfcd2d1123d6ef94271c0d8fab153e3c7c7a..d536ec7f129c3af4cd326102f10ac4d2f7d5f8a6 100644
--- a/arch/ia64/configs/tiger_defconfig
+++ b/arch/ia64/configs/tiger_defconfig
@@ -109,7 +109,6 @@ CONFIG_COMPAT=y
 CONFIG_IA64_MCA_RECOVERY=y
 CONFIG_PERFMON=y
 CONFIG_IA64_PALINFO=y
-CONFIG_ACPI_DEALLOCATE_IRQ=y
 
 #
 # Firmware Drivers
diff --git a/arch/ia64/configs/zx1_defconfig b/arch/ia64/configs/zx1_defconfig
index 88e8867fa8e82f65092a9e5e99e0f437a3f43191..d569036a4cea10d97ea391ae745681ab1eb44337 100644
--- a/arch/ia64/configs/zx1_defconfig
+++ b/arch/ia64/configs/zx1_defconfig
@@ -109,7 +109,6 @@ CONFIG_COMPAT=y
 CONFIG_IA64_MCA_RECOVERY=y
 CONFIG_PERFMON=y
 CONFIG_IA64_PALINFO=y
-CONFIG_ACPI_DEALLOCATE_IRQ=y
 
 #
 # Firmware Drivers
diff --git a/arch/ia64/defconfig b/arch/ia64/defconfig
index 8444add763800905e441cd8feb7c2fea1b79770d..e3a907bd960e5799e9f90f1f2da68d50bb97df2b 100644
--- a/arch/ia64/defconfig
+++ b/arch/ia64/defconfig
@@ -99,7 +99,6 @@ CONFIG_COMPAT=y
 CONFIG_IA64_MCA_RECOVERY=y
 CONFIG_PERFMON=y
 CONFIG_IA64_PALINFO=y
-CONFIG_ACPI_DEALLOCATE_IRQ=y
 
 #
 # Firmware Drivers
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 9609f243e5d05d2591393a66e1a542cb6058ecbc..66970d7b6c87a34360aebb47cef427ef2be8ad01 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -575,14 +575,12 @@ acpi_register_gsi (u32 gsi, int edge_level, int active_high_low)
 }
 EXPORT_SYMBOL(acpi_register_gsi);
 
-#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
 void
 acpi_unregister_gsi (u32 gsi)
 {
 	iosapic_unregister_intr(gsi);
 }
 EXPORT_SYMBOL(acpi_unregister_gsi);
-#endif /* CONFIG_ACPI_DEALLOCATE_IRQ */
 
 static int __init
 acpi_parse_fadt (unsigned long phys_addr, unsigned long size)
diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
index 7936b62f7a2e323a0f1d5d4ee4c46a2894bf5682..c0c3f55b023140b84759b8fa5fabdf6ce17f981b 100644
--- a/arch/ia64/kernel/iosapic.c
+++ b/arch/ia64/kernel/iosapic.c
@@ -776,7 +776,6 @@ iosapic_register_intr (unsigned int gsi,
 	return vector;
 }
 
-#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
 void
 iosapic_unregister_intr (unsigned int gsi)
 {
@@ -859,7 +858,6 @@ iosapic_unregister_intr (unsigned int gsi)
 	spin_unlock(&iosapic_lock);
 	spin_unlock_irqrestore(&idesc->lock, flags);
 }
-#endif /* CONFIG_ACPI_DEALLOCATE_IRQ */
 
 /*
  * ACPI calls this when it finds an entry for a platform interrupt.
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 9977c122e9fa2c1a314e2d90fb5260dba87b0cb7..9b5de589b82f4bea4be004911ef5c4ef40a413c3 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -498,13 +498,11 @@ pcibios_enable_device (struct pci_dev *dev, int mask)
 	return acpi_pci_irq_enable(dev);
 }
 
-#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
 void
 pcibios_disable_device (struct pci_dev *dev)
 {
 	acpi_pci_irq_disable(dev);
 }
-#endif /* CONFIG_ACPI_DEALLOCATE_IRQ */
 
 void
 pcibios_align_resource (void *data, struct resource *res,
diff --git a/include/asm-ia64/iosapic.h b/include/asm-ia64/iosapic.h
index a429fe225b07b4fb85de63f623640c6b2355f23e..9a18820f22a296281e6e5c51e8dcd240a6162d05 100644
--- a/include/asm-ia64/iosapic.h
+++ b/include/asm-ia64/iosapic.h
@@ -83,9 +83,7 @@ extern int gsi_to_irq (unsigned int gsi);
 extern void iosapic_enable_intr (unsigned int vector);
 extern int iosapic_register_intr (unsigned int gsi, unsigned long polarity,
 				  unsigned long trigger);
-#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
 extern void iosapic_unregister_intr (unsigned int irq);
-#endif
 extern void __init iosapic_override_isa_irq (unsigned int isa_irq, unsigned int gsi,
 				      unsigned long polarity,
 				      unsigned long trigger);