x86: change __setup_vector_irq with setup_vector_irq

We create a version of it for i386, and then take the CONFIG_X86_64
ifdef out of the game. We could create a __setup_vector_irq for i386,
but it would incur in an unnecessary lock taking. Moreover, it is better
practice to only export setup_vector_irq anyway.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/io_apic_32.c

@@ -1207,6 +1207,11 @@ static int assign_irq_vector(int irq)
 
 	return vector;
 }
+
+void setup_vector_irq(int cpu)
+{
+}
+
 static struct irq_chip ioapic_chip;
 
 #define IOAPIC_AUTO	-1

arch/x86/kernel/io_apic_64.c

@@ -801,7 +801,7 @@ static void __clear_irq_vector(int irq)
 	cpus_clear(cfg->domain);
 }
 
-void __setup_vector_irq(int cpu)
+static void __setup_vector_irq(int cpu)
 {
 	/* Initialize vector_irq on a new cpu */
 	/* This function must be called with vector_lock held */
@@ -824,6 +824,13 @@ void __setup_vector_irq(int cpu)
 	}
 }
 
+void setup_vector_irq(int cpu)
+{
+	spin_lock(&vector_lock);
+	__setup_vector_irq(smp_processor_id());
+	spin_unlock(&vector_lock);
+}
+
 
 static struct irq_chip ioapic_chip;
 

arch/x86/kernel/smpboot.c

@@ -329,15 +329,8 @@ static void __cpuinit start_secondary(void *unused)
 	 * smp_call_function().
 	 */
 	lock_ipi_call_lock();
-#ifdef CONFIG_X86_64
-	spin_lock(&vector_lock);
-
-	/* Setup the per cpu irq handling data structures */
-	__setup_vector_irq(smp_processor_id());
-	/*
-	 * Allow the master to continue.
-	 */
-	spin_unlock(&vector_lock);
+#ifdef CONFIG_X86_IO_APIC
+	setup_vector_irq(smp_processor_id());
 #endif
 	cpu_set(smp_processor_id(), cpu_online_map);
 	unlock_ipi_call_lock();

include/asm-x86/hw_irq.h

@@ -97,9 +97,9 @@ extern void (*const interrupt[NR_IRQS])(void);
 #else
 typedef int vector_irq_t[NR_VECTORS];
 DECLARE_PER_CPU(vector_irq_t, vector_irq);
-extern void __setup_vector_irq(int cpu);
 extern spinlock_t vector_lock;
 #endif
+extern void setup_vector_irq(int cpu);
 
 #endif /* !ASSEMBLY_ */