linux-kernel - Re: [PATCH] drivers/pcmcia: NO_IRQ removal for electra

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Date:   Thu, 16 Mar 2017 11:05:35 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-pcmcia@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        oss@...error.net, linuxppc-dev@...abs.org,
        Claudiu Manoil <claudiu.manoil@....com>, qiang.zhao@....com
Subject: Re: [PATCH] drivers/pcmcia: NO_IRQ removal for electra_cf.c

On Thu, Mar 16, 2017 at 10:55 AM, Michael Ellerman <mpe@...erman.id.au> wrote:
> Arnd Bergmann <arnd@...db.de> writes:
>> On Wed, Mar 15, 2017 at 6:35 AM, Michael Ellerman <mpe@...erman.id.au> wrote:
>>> I'll do patches for everything above that's not drivers/soc or
>>> include/soc and hopefully we can hear from someone at NXP on the plans
>>> for getting the soc parts enabled on arm.
>>
>> I think the removal of the NO_IRQ references is a requirement for
>> getting the drivers working properly on ARM, as the OF platform
>> code will use '0' for invalid IRQs.
>
> OK. So the #define NO_IRQ (-1) in arch/arm/include/asm/irq.h is a red
> herring and should be ignored for anything modern?

Correct. There are a couple of older (non-DT) platforms that still rely on it,
and I also have patches for those, which I intend to revisit at some point.

     Arnd