linux-kernel - Re: [PATCH 0/2] irqchip/gic*: Complain about the use of IRQ_TYPE

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Date:   Fri, 16 Mar 2018 16:19:44 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Marc Zyngier <marc.zyngier@....com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>
Subject: Re: [PATCH 0/2] irqchip/gic*: Complain about the use of IRQ_TYPE_NONE

On 16/03/18 14:55, Marc Zyngier wrote:
> Grepping through the dts files, the documentation, and reviewing
> patches, one can only notice the use of IRQ_TYPE_NONE in interrupt
> specifiers. At least for the GIC, this doesn't mean anything. The
> unsuspecting driver will end-up with whatever was there before, and
> there is a 50% probability that it is not what it wants.
> 
> I'd love to fix it myself, but I also have a 50% probability of
> getting it wrong. In order to make the user aware they are walking on
> thin ice, let's add some warnings. Hopefully, they'll be annoying
> enough that people will fix their firmware. Croudsourcing debugging...

I guess there's also the alternative nuclear option of breaking their 
build ;)

Robin.

----->8-----
diff --git a/include/dt-bindings/interrupt-controller/irq.h 
b/include/dt-bindings/interrupt-controller/irq.h
index a8b310555f14..de79af80d01e 100644
--- a/include/dt-bindings/interrupt-controller/irq.h
+++ b/include/dt-bindings/interrupt-controller/irq.h
@@ -10,7 +10,7 @@
  #ifndef _DT_BINDINGS_INTERRUPT_CONTROLLER_IRQ_H
  #define _DT_BINDINGS_INTERRUPT_CONTROLLER_IRQ_H

-#define IRQ_TYPE_NONE		0
+#define IRQ_TYPE_NONE		"This is nonsense and needs fixing"
  #define IRQ_TYPE_EDGE_RISING	1
  #define IRQ_TYPE_EDGE_FALLING	2
  #define IRQ_TYPE_EDGE_BOTH	(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)