[PATCH] genirq: more verbose debugging on unexpected IRQ vectors
One frequent sign of IRQ handling bugs is the appearance of unexpected
vectors. Print out all the IRQ state in that case. We dont want this patch
upstream, but it is useful during initial testing.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 2ba8ae3..08a849a 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -22,3 +22,43 @@
struct irqaction *action) { }
#endif
+/*
+ * Debugging printout:
+ */
+
+#include <linux/kallsyms.h>
+
+#define P(f) if (desc->status & f) printk("%14s set\n", #f)
+
+static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc)
+{
+ printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n",
+ irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled);
+ printk("->handle_irq(): %p, ", desc->handle_irq);
+ print_symbol("%s\n", (unsigned long)desc->handle_irq);
+ printk("->chip(): %p, ", desc->chip);
+ print_symbol("%s\n", (unsigned long)desc->chip);
+ printk("->action(): %p\n", desc->action);
+ if (desc->action) {
+ printk("->action->handler(): %p, ", desc->action->handler);
+ print_symbol("%s\n", (unsigned long)desc->action->handler);
+ }
+
+ P(IRQ_INPROGRESS);
+ P(IRQ_DISABLED);
+ P(IRQ_PENDING);
+ P(IRQ_REPLAY);
+ P(IRQ_AUTODETECT);
+ P(IRQ_WAITING);
+ P(IRQ_LEVEL);
+ P(IRQ_MASKED);
+#ifdef CONFIG_IRQ_PER_CPU
+ P(IRQ_PER_CPU);
+#endif
+ P(IRQ_NOPROBE);
+ P(IRQ_NOREQUEST);
+ P(IRQ_NOAUTOEN);
+}
+
+#undef P
+
