x86/ipipe: fix irqchip handlers involved in IRQ remapping

This fix enables interrupt pipelining with CONFIG_IRQ_REMAP for
IO_APIC and MSI.

arch/x86/kernel/apic/io_apic.c

@@ -579,8 +579,6 @@ static void __eoi_ioapic_irq(struct irq_cfg *cfg)
 					       cfg->vector);
 }
 
-#if !defined(CONFIG_IPIPE) || defined(CONFIG_SMP)
-
 void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg)
 {
 	unsigned long flags;
@@ -590,8 +588,6 @@ void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg)
 	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
 }
 
-#endif /* !CONFIG_IPIPE || CONFIG_SMP */
-
 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
 {
 	struct IO_APIC_route_entry entry;

drivers/iommu/irq_remapping.c

@@ -334,12 +334,12 @@ void panic_if_irq_remap(const char *msg)
 
 static void ir_ack_apic_edge(struct irq_data *data)
 {
-	ack_APIC_irq();
+	__ack_APIC_irq();
 }
 
 static void ir_ack_apic_level(struct irq_data *data)
 {
-	ack_APIC_irq();
+	__ack_APIC_irq();
 	eoi_ioapic_irq(data->irq, irqd_cfg(data));
 }