x86/apic: Only compile local function if used with !CONFIG_GENERIC_PENDING_IRQ

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. Move the
io_apic_level_ack_pending() to the existing #ifdef
CONFIG_GENERIC_PENDING_IRQ code block.

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>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Link: http://lkml.kernel.org/r/1336461860.2296.3.camel@sbsiddha-mobl2Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/apic/io_apic.c

@@ -346,29 +346,6 @@ void native_io_apic_modify(unsigned int apic, unsigned int reg, unsigned int val
 	writel(value, &io_apic->data);
 }
 
-static bool io_apic_level_ack_pending(struct irq_cfg *cfg)
-{
-	struct irq_pin_list *entry;
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&ioapic_lock, flags);
-	for_each_irq_pin(entry, cfg->irq_2_pin) {
-		unsigned int reg;
-		int pin;
-
-		pin = entry->pin;
-		reg = io_apic_read(entry->apic, 0x10 + pin*2);
-		/* Is the remote IRR bit set? */
-		if (reg & IO_APIC_REDIR_REMOTE_IRR) {
-			raw_spin_unlock_irqrestore(&ioapic_lock, flags);
-			return true;
-		}
-	}
-	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
-
-	return false;
-}
-
 union entry_union {
 	struct { u32 w1, w2; };
 	struct IO_APIC_route_entry entry;
@@ -2519,6 +2496,29 @@ static void ack_apic_edge(struct irq_data *data)
 atomic_t irq_mis_count;
 
 #ifdef CONFIG_GENERIC_PENDING_IRQ
+static bool io_apic_level_ack_pending(struct irq_cfg *cfg)
+{
+	struct irq_pin_list *entry;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	for_each_irq_pin(entry, cfg->irq_2_pin) {
+		unsigned int reg;
+		int pin;
+
+		pin = entry->pin;
+		reg = io_apic_read(entry->apic, 0x10 + pin*2);
+		/* Is the remote IRR bit set? */
+		if (reg & IO_APIC_REDIR_REMOTE_IRR) {
+			raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+			return true;
+		}
+	}
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+
+	return false;
+}
+
 static inline bool ioapic_irqd_mask(struct irq_data *data, struct irq_cfg *cfg)
 {
 	/* If we are moving the irq we need to mask it */