Rename it with a proper irq_ prefix and make it available for other files
in the core code. Preparatory patch for moving the irq affinity setup
around.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/irq/internals.h |    6 ++++++
 kernel/irq/manage.c    |    7 +------
 2 files changed, 7 insertions(+), 6 deletions(-)

--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -116,6 +116,12 @@ extern void irq_set_thread_affinity(stru
 extern int irq_do_set_affinity(struct irq_data *data,
 			       const struct cpumask *dest, bool force);
 
+#ifdef CONFIG_SMP
+extern int irq_setup_affinity(struct irq_desc *desc);
+#else
+static inline int irq_setup_affinity(struct irq_desc *desc) { return 0; }
+#endif
+
 /* Inline functions for support of irq chips on slow busses */
 static inline void chip_bus_lock(struct irq_desc *desc)
 {
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -345,7 +345,7 @@ EXPORT_SYMBOL_GPL(irq_set_affinity_notif
 /*
  * Generic version of the affinity autoselector.
  */
-static int irq_setup_affinity(struct irq_desc *desc)
+int irq_setup_affinity(struct irq_desc *desc)
 {
 	struct cpumask *set = irq_default_affinity;
 	int ret, node = irq_desc_get_node(desc);
@@ -404,11 +404,6 @@ int irq_select_affinity_usr(unsigned int
 	raw_spin_unlock_irqrestore(&desc->lock, flags);
 	return ret;
 }
-#else
-static inline int setup_affinity(struct irq_desc *desc)
-{
-	return 0;
-}
 #endif
 
 /**