ppc64: Add warning for unhandled irqs

arch/ppc64/kernel/irq.c

@@ -381,22 +381,48 @@ int show_interrupts(struct seq_file *p, void *v)
 	return 0;
 }
 
-static inline void
-handle_irq_event(int irq, struct pt_regs *regs, struct irqaction *action)
+extern char *ppc_find_proc_name(unsigned *p, char *buf, unsigned buflen);
+
+static inline void handle_irq_event(int irq, struct pt_regs *regs,
+				    struct irqaction *action)
 {
 	int status = 0;
+	int retval = 0;
+	struct irqaction *first_action = action;
 
 	if (!(action->flags & SA_INTERRUPT))
 		local_irq_enable();
 
 	do {
 		status |= action->flags;
-		action->handler(irq, action->dev_id, regs);
+		retval |= action->handler(irq, action->dev_id, regs);
 		action = action->next;
 	} while (action);
 	if (status & SA_SAMPLE_RANDOM)
 		add_interrupt_randomness(irq);
 	local_irq_disable();
+	if (retval != 1) {
+		static int count = 100;
+		char name_buf[256];
+		if (count) {
+			count--;
+			if (retval) {
+				printk("irq event %d: bogus retval mask %x\n",
+					irq, retval);
+			} else {
+				printk("irq %d: nobody cared!\n", irq);
+			}
+			dump_stack();
+			printk("handlers:\n");
+			action = first_action;
+			do {
+				printk("[<%p>]", action->handler);
+				printk(" (%s)\n",
+				       ppc_find_proc_name((unsigned *)action->handler, name_buf, 256));
+				action = action->next;
+			} while (action);
+		}
+	}
 }
 
 /*

arch/ppc64/kernel/process.c

@@ -129,7 +129,7 @@ struct task_struct *__switch_to(struct task_struct *prev,
 }
 
 static void show_tsk_stack(struct task_struct *p, unsigned long sp);
-static char *ppc_find_proc_name(unsigned *p, char *buf, unsigned buflen);
+char *ppc_find_proc_name(unsigned *p, char *buf, unsigned buflen);
 
 void show_regs(struct pt_regs * regs)
 {
@@ -426,7 +426,7 @@ void initialize_paca_hardware_interrupt_stack(void)
 
 extern char _stext[], _etext[], __init_begin[], __init_end[];
 
-static char *ppc_find_proc_name(unsigned *p, char *buf, unsigned buflen)
+char *ppc_find_proc_name(unsigned *p, char *buf, unsigned buflen)
 {
 	unsigned long tb_flags;
 	unsigned short name_len;