diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 00151a8320d8..ed25d66c8d50 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -339,12 +339,6 @@ 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 ACPI
-	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 1ca6e6e11b42..08112ab38468 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 3ec94a12eac0..d452e18ac494 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 d4cf73d124bc..80b0e9eb7fb3 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 b6ec8d32c346..5da208115ea1 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
@@ -335,7 +334,7 @@ CONFIG_SCSI_SYM53C8XX_DEFAULT_TAGS=16
 CONFIG_SCSI_SYM53C8XX_MAX_TAGS=64
 # CONFIG_SCSI_SYM53C8XX_IOMAPPED is not set
 # CONFIG_SCSI_IPR is not set
-CONFIG_SCSI_QLOGIC_FC=y
+# CONFIG_SCSI_QLOGIC_FC is not set
 # CONFIG_SCSI_QLOGIC_FC_FIRMWARE is not set
 CONFIG_SCSI_QLOGIC_1280=y
 # CONFIG_SCSI_QLOGIC_1280_1040 is not set
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 318787c84ac0..28a4529fdd60 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -583,14 +583,12 @@ int 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/entry.S b/arch/ia64/kernel/entry.S
index 9be53e1ea404..3c8821024509 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -204,9 +204,6 @@ GLOBAL_ENTRY(ia64_switch_to)
 (p6)	br.cond.dpnt .map
 	;;
 .done:
-(p6)	ssm psr.ic			// if we had to map, reenable the psr.ic bit FIRST!!!
-	;;
-(p6)	srlz.d
 	ld8 sp=[r21]			// load kernel stack pointer of new task
 	mov IA64_KR(CURRENT)=in0	// update "current" application register
 	mov r8=r13			// return pointer to previously running task
@@ -234,6 +231,9 @@ GLOBAL_ENTRY(ia64_switch_to)
 	mov IA64_KR(CURRENT_STACK)=r26	// remember last page we mapped...
 	;;
 	itr.d dtr[r25]=r23		// wire in new mapping...
+	ssm psr.ic			// reenable the psr.ic bit
+	;;
+	srlz.d
 	br.cond.sptk .done
 END(ia64_switch_to)
 
diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
index a13df592ebf7..574084f343fa 100644
--- a/arch/ia64/kernel/iosapic.c
+++ b/arch/ia64/kernel/iosapic.c
@@ -782,7 +782,6 @@ again:
 	return vector;
 }
 
-#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
 void
 iosapic_unregister_intr (unsigned int gsi)
 {
@@ -865,7 +864,6 @@ 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/lib/memcpy_mck.S b/arch/ia64/lib/memcpy_mck.S
index 6f308e62c137..46c9331e7ab5 100644
--- a/arch/ia64/lib/memcpy_mck.S
+++ b/arch/ia64/lib/memcpy_mck.S
@@ -625,8 +625,11 @@ EK(.ex_handler,  (p17)	st8	[dst1]=r39,8);						\
 	clrrrb
 	;;
 	alloc	saved_pfs_stack=ar.pfs,3,3,3,0
+	cmp.lt	p8,p0=A,r0
 	sub	B = dst0, saved_in0	// how many byte copied so far
 	;;
+(p8)	mov	A = 0;			// A shouldn't be negative, cap it
+	;;
 	sub	C = A, B
 	sub	D = saved_in2, A
 	;;
diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
index 24614869e866..3c32af910d60 100644
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -230,9 +230,6 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
 		return;
 	}
 
-	if (ia64_done_with_exception(regs))
-		return;
-
 	/*
 	 * Since we have no vma's for region 5, we might get here even if the address is
 	 * valid, due to the VHPT walker inserting a non present translation that becomes
@@ -243,6 +240,9 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
 	if (REGION_NUMBER(address) == 5 && mapped_kernel_page_is_present(address))
 		return;
 
+	if (ia64_done_with_exception(regs))
+		return;
+
 	/*
 	 * Oops. The kernel tried to access some bad page. We'll have to terminate things
 	 * with extreme prejudice.
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 9977c122e9fa..9b5de589b82f 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/arch/ia64/sn/kernel/setup.c b/arch/ia64/sn/kernel/setup.c
index a594aca959e6..14908ad7db8c 100644
--- a/arch/ia64/sn/kernel/setup.c
+++ b/arch/ia64/sn/kernel/setup.c
@@ -56,7 +56,7 @@
 
 DEFINE_PER_CPU(struct pda_s, pda_percpu);
 
-#define MAX_PHYS_MEMORY		(1UL << 49)	/* 1 TB */
+#define MAX_PHYS_MEMORY		(1UL << IA64_MAX_PHYS_BITS)	/* Max physical address supported */
 
 lboard_t *root_lboard[MAX_COMPACT_NODES];
 
diff --git a/arch/ia64/sn/kernel/xpc_main.c b/arch/ia64/sn/kernel/xpc_main.c
index bb1d5cf30440..ed7c21586e98 100644
--- a/arch/ia64/sn/kernel/xpc_main.c
+++ b/arch/ia64/sn/kernel/xpc_main.c
@@ -885,6 +885,10 @@ xpc_init(void)
 	pid_t pid;
 
 
+	if (!ia64_platform_is("sn2")) {
+		return -ENODEV;
+	}
+
 	/*
 	 * xpc_remote_copy_buffer is used as a temporary buffer for bte_copy'ng
 	 * both a partition's reserved page and its XPC variables. Its size was
diff --git a/arch/ia64/sn/kernel/xpnet.c b/arch/ia64/sn/kernel/xpnet.c
index 78c13d676fa6..d0c2c114a459 100644
--- a/arch/ia64/sn/kernel/xpnet.c
+++ b/arch/ia64/sn/kernel/xpnet.c
@@ -636,6 +636,10 @@ xpnet_init(void)
 	int result = -ENOMEM;
 
 
+	if (!ia64_platform_is("sn2")) {
+		return -ENODEV;
+	}
+
 	dev_info(xpnet, "registering network device %s\n", XPNET_DEVICE_NAME);
 
 	/*
diff --git a/include/asm-ia64/iosapic.h b/include/asm-ia64/iosapic.h
index a429fe225b07..20f98f1751a1 100644
--- a/include/asm-ia64/iosapic.h
+++ b/include/asm-ia64/iosapic.h
@@ -80,12 +80,9 @@ extern int iosapic_remove (unsigned int gsi_base);
 #endif /* CONFIG_HOTPLUG */
 extern int gsi_to_vector (unsigned int gsi);
 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);
@@ -97,7 +94,6 @@ extern int __init iosapic_register_platform_intr (u32 int_type,
 					   unsigned long trigger);
 extern unsigned int iosapic_version (char __iomem *addr);
 
-extern void iosapic_pci_fixup (int);
 #ifdef CONFIG_NUMA
 extern void __devinit map_iosapic_to_node (unsigned int, int);
 #endif
diff --git a/include/asm-ia64/irq.h b/include/asm-ia64/irq.h
index cd984d08fd15..dbe86c0bbce5 100644
--- a/include/asm-ia64/irq.h
+++ b/include/asm-ia64/irq.h
@@ -35,8 +35,4 @@ extern void disable_irq_nosync (unsigned int);
 extern void enable_irq (unsigned int);
 extern void set_irq_affinity_info (unsigned int irq, int dest, int redir);
 
-struct irqaction;
-struct pt_regs;
-int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
-
 #endif /* _ASM_IA64_IRQ_H */