genirq: add reverse iterator for irq_desc

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

genirq: add reverse iterator for irq_desc
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
811410fd · Thomas Gleixner · Ingo Molnar · 249f6d9e · 811410fd
Commit 811410fd authored Oct 16, 2008 by Thomas Gleixner Committed by Ingo Molnar Oct 16, 2008
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include/linux/irq.h include/linux/irq.h +4 -0

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--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -21,6 +21,10 @@ extern int nr_irqs;

 # define for_each_irq_desc(irq, desc)		\
 	for (irq = 0, desc = irq_desc; irq < nr_irqs; irq++, desc++)
+
+# define for_each_irq_desc_reverse(irq, desc)			\
+	for (irq = nr_irqs -1, desc = irq_desc + (nr_irqs -1 );	\
+	     irq > 0; irq--, desc--)
 #endif

 #ifndef CONFIG_S390