From c6b7674f323622d86316bf7951ad9cae1ce24642 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 15 Oct 2008 14:31:29 +0200
Subject: [PATCH] genirq: use inline function for irq_to_desc

For the non sparse irq case an inline function is perfectly fine.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 include/linux/irq.h | 15 +++++++++++++--
 kernel/irq/handle.c | 14 --------------
 2 files changed, 13 insertions(+), 16 deletions(-)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index dbe8734ae86c..7d1adacaadb4 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -204,8 +204,6 @@ struct irq_desc {
 	const char		*name;
 } ____cacheline_internodealigned_in_smp;
 
-extern struct irq_desc *irq_to_desc(unsigned int irq);
-extern struct irq_desc *irq_to_desc_alloc(unsigned int irq);
 
 #ifndef CONFIG_HAVE_SPARSE_IRQ
 
@@ -216,8 +214,21 @@ extern struct irq_desc irq_desc[NR_IRQS];
 extern struct irq_desc *irq_desc;
 #endif
 
+static inline struct irq_desc *irq_to_desc(unsigned int irq)
+{
+	return (irq < nr_irqs) ? irq_desc + irq : NULL;
+}
+
+static inline struct irq_desc *irq_to_desc_alloc(unsigned int irq)
+{
+	return irq_to_desc(irq);
+}
+
 #else
 
+extern struct irq_desc *irq_to_desc(unsigned int irq);
+extern struct irq_desc *irq_to_desc_alloc(unsigned int irq);
+
 extern struct irq_desc *sparse_irqs;
 #define for_each_irq_desc(irqX, desc)		\
 	for (desc = sparse_irqs, irqX = desc->irq; desc; desc = desc->next, irqX = desc ? desc->irq : -1U)
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index fb6bdb602a93..c19896f895f9 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -262,20 +262,6 @@ struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
 
 #endif
 
-#ifndef CONFIG_HAVE_SPARSE_IRQ
-struct irq_desc *irq_to_desc(unsigned int irq)
-{
-	if (irq < nr_irqs)
-		return &irq_desc[irq];
-
-	return NULL;
-}
-struct irq_desc *irq_to_desc_alloc(unsigned int irq)
-{
-	return irq_to_desc(irq);
-}
-#endif
-
 /*
  * What should we do if we get a hw irq event on an illegal vector?
  * Each architecture has to answer this themself.