genirq: add reverse iterator for irq_desc

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

genirq: add reverse iterator for irq_desc
Signed-off-by: N Thomas Gleixner <tglx@linutronix.de>
811410fd · Thomas Gleixner · Ingo Molnar · 249f6d9e · 811410fd
隐藏空白更改
内联并排

Showing with 4 addition and 0 deletion

include/linux/irq.h include/linux/irq.h +4 -0

未找到文件。
--- 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