[PATCH] x86 apic: only compile local function if used

["Németh Márton" <nm127@freemail.hu>]

From: Márton Németh <nm127@freemail.hu>

The local function io_apic_level_ack_pending() is only called from
io_apic_level_ack_pending(). The later function is only compiled
if CONFIG_GENERIC_PENDING_IRQ is defined. Use this define around
io_apic_level_ack_pending() function as well.

This will remove the following warning message during compiling
without CONFIG_GENERIC_PENDING_IRQ defined:
 * arch/x86/kernel/apic/io_apic.c:382: warning: ‘io_apic_level_ack_pending’ defined but not used

Signed-off-by: Márton Németh <nm127@freemail.hu>
---
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index e88300d..9b85009 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -379,6 +379,7 @@ static void __io_apic_modify(unsigned int apic, unsigned int reg, unsigned int v
 	writel(value, &io_apic->data);
 }

+#ifdef CONFIG_GENERIC_PENDING_IRQ
 static bool io_apic_level_ack_pending(struct irq_cfg *cfg)
 {
 	struct irq_pin_list *entry;
@@ -401,6 +402,7 @@ static bool io_apic_level_ack_pending(struct irq_cfg *cfg)

 	return false;
 }
+#endif

 union entry_union {
 	struct { u32 w1, w2; };