linux-kernel - Re: [PATCH] irqchip: gic-v3: Explicitly include linux/io.h

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Message-ID: <CAOV7ByJKCDjPkWkuS1DU2S-b7B0+PDwY8CeyYU51VWG9Aadd3Q@mail.gmail.com>
Date:	Wed, 19 Aug 2015 15:44:37 -0700
From:	Ben Zhang <benzh@...gle.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Marc Zyngier <marc.zyngier@....com>,
	Jason Cooper <jason@...edaemon.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Nicolas Boichat <drinkcat@...omium.org>
Subject: Re: [PATCH] irqchip: gic-v3: Explicitly include linux/io.h

This patch is not really needed. The build failure on our v3.18-based
kernel is fixed by cherry-picking commit 332fd7c4fef5 ("genirq:
Generic chip: Change irq_reg_{readl,writel} arguments") which is
actually a functional no-op. This patch could help prevent future
build failure in case linux/io.h is later removed from linux/irq.h.
Since the irq-gic-v3 driver uses the read/write io functions, it might
be better to include linux/io.h explicitly.

Thanks,
Ben

On Wed, Aug 19, 2015 at 2:13 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Fri, 7 Aug 2015, Ben Zhang wrote:
>> Mainline build is fine because commit 332fd7c4fef5("genirq: Generic
>> chip: Change irq_reg_{readl,writel} arguments") landed before the
>> timecounter patch, and it creates a new include path to the io.h
>> header:
>> arch/arm64/include/asm/io.h
>> include/linux/io.h
>> include/linux/irq.h
>> include/linux/of_irq.h
>> drivers/irqchip/irq-gic-v3.c
>
> And why do we need to include it once more then?
>
> Thanks,
>
>         tglx
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