[PATCH V2] ARM: warn if bad IRQ was scheduled

[Dmitry Eremin-Solenikov]

If somebody causes an unexpected bad IRQ, this even will be unnoticed in
both dmesg and system logs. If the "bad" IRQ is stuck, the device will
just hang silently w/o reporting anything. Compare this to the generic
behaviour (from include/asm-generic/hardirq.h) which prints a message
with critical level. So to help everybody, include the same message into
ARM-specific ack_bad_irq().

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov at gmail.com>
---
 arch/arm/include/asm/hw_irq.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/include/asm/hw_irq.h b/arch/arm/include/asm/hw_irq.h
index a71b417..af79da4 100644
--- a/arch/arm/include/asm/hw_irq.h
+++ b/arch/arm/include/asm/hw_irq.h
@@ -8,6 +8,7 @@ static inline void ack_bad_irq(int irq)
 {
 	extern unsigned long irq_err_count;
 	irq_err_count++;
+	pr_crit("unexpected IRQ trap at vector %02x\n", irq);
 }
 
 void set_irq_flags(unsigned int irq, unsigned int flags);
-- 
2.1.1