On Thu, 2014-09-11 at 22:03 +0800, Jiang Liu wrote:

+#else	/* CONFIG_IRQ_DOMAIN_HIERARCHY */
+static inline int irq_domain_activate_irq(struct irq_data *data) { return 0; }
+static inline int irq_domain_deactivate_irq(struct irq_data *data) { return 0; }
+#endif	/* CONFIG_IRQ_DOMAIN_HIERARCHY */
+

I get the following build warnings on these lines:

../include/linux/irqdomain.h:75:47: warning: 'struct irq_data' declared
inside parameter list [enabled by default]
../include/linux/irqdomain.h:75:47: warning: its scope is only this
definition or declaration, which is probably not what you want [enabled
by default]
../include/linux/irqdomain.h:76:49: warning: 'struct irq_data' declared
inside parameter list [enabled by default

Joe.C