Hi Rob,

On Tue, Sep 20, 2011 at 03:24:04PM -0500, Rob Herring wrote:
[...]

+int __init gic_of_init(struct device_node *node, struct device_node *parent)
+{
+	void __iomem *cpu_base;
+	void __iomem *dist_base;
+	int irq;
+	struct irq_domain *domain = &gic_data[gic_cnt].domain;
+
+	if (WARN_ON(!node))
+		return -ENODEV;
+
+	dist_base = of_iomap(node, 0);
+	WARN(!dist_base, "unable to map gic dist registers\n");
+
+	cpu_base = of_iomap(node, 1);
+	WARN(!cpu_base, "unable to map gic cpu registers\n");
+
+	domain->nr_irq = gic_irq_count(dist_base);
+	/* subtract off SGIs. Also subtract off PPIs for secondary GICs */
+	if (parent)
+		domain->nr_irq -= 32;
+	else
+		domain->nr_irq -= 16;
+
+	domain->irq_base = irq_alloc_descs(-1, 16, domain->nr_irq, numa_node_id());

The way I understand irq_alloc_descs() (probably not very well) is that 
having the irq parameter < 0 and the from parameter 16 means that it 
needs to find domain->nr_irq descs starting from at least 16.  But if 
the base is greater than 16, does this still work with the gic entry 
macros as they are?

Jamie