genirq: Remove desc->status when GENERIC_HARDIRQS_NO_COMPAT=y

If everything uses the right accessors, then enabling
GENERIC_HARDIRQS_NO_COMPAT should just work. If not it will tell you.

Don't be lazy and use the trick which I use in the core code!

git grep status_use_accessors

will unearth it in a split second. Offenders are tracked down and not
slapped with stinking trouts. This time we use frozen shark for a
better educational value.

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

include/linux/irqdesc.h

@@ -64,7 +64,11 @@ struct irq_desc {
 	unsigned int __percpu	*kstat_irqs;
 	irq_flow_handler_t	handle_irq;
 	struct irqaction	*action;	/* IRQ action list */
+#ifdef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
+	unsigned int		status_use_accessors;
+#else
 	unsigned int		status;		/* IRQ status */
+#endif
 	unsigned int		core_internal_state__do_not_mess_with_it;
 	unsigned int		depth;		/* nested irq disables */
 	unsigned int		wake_depth;	/* nested wake enables */
@@ -164,13 +168,15 @@ static inline int irq_has_action(unsigned int irq)
 	return desc->action != NULL;
 }
 
+#ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
 static inline int irq_balancing_disabled(unsigned int irq)
 {
 	struct irq_desc *desc;
 
 	desc = irq_to_desc(irq);
 	return desc->status & IRQ_NO_BALANCING_MASK;
 }
+#endif
 
 /* caller has locked the irq_desc and both params are valid */
 static inline void __set_irq_handler_unlocked(int irq,

kernel/irq/internals.h

@@ -15,6 +15,10 @@
 
 #define istate core_internal_state__do_not_mess_with_it
 
+#ifdef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
+# define status status_use_accessors
+#endif
+
 extern int noirqdebug;
 
 /*

kernel/irq/settings.h

@@ -134,4 +134,5 @@ static inline bool irq_settings_is_nested_thread(struct irq_desc *desc)
 }
 
 /* Nothing should touch desc->status from now on */
+#undef status
 #define status		USE_THE_PROPER_WRAPPERS_YOU_MORON