diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 0be2f27..56dcf08 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -190,6 +190,24 @@
 struct io_apic_irq_attr;
 static inline int io_apic_set_pci_routing(struct device *dev, int irq,
 		 struct io_apic_irq_attr *irq_attr) { return 0; }
+
+static inline struct IO_APIC_route_entry **alloc_ioapic_entries(void)
+{
+	return NULL;
+}
+
+static inline void free_ioapic_entries(struct IO_APIC_route_entry **ent) { }
+static inline int save_IO_APIC_setup(struct IO_APIC_route_entry **ent)
+{
+	return -ENOMEM;
+}
+
+static inline void mask_IO_APIC_setup(struct IO_APIC_route_entry **ent) { }
+static inline int restore_IO_APIC_setup(struct IO_APIC_route_entry **ent)
+{
+	return -ENOMEM;
+}
+
 static inline void mp_save_irq(struct mpc_intsrc *m) { };
 static inline void disable_ioapic_support(void) { }
 #endif
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 96e6809..f0e0798 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1449,7 +1449,7 @@
 void __init enable_IR_x2apic(void)
 {
 	unsigned long flags;
-	struct IO_APIC_route_entry **ioapic_entries = NULL;
+	struct IO_APIC_route_entry **ioapic_entries;
 	int ret, x2apic_enabled = 0;
 	int dmar_table_init_ret;