linux-kernel - Re: include/linux/io-mapping.h:130:39: error: implicit declaration of function 'ioremap

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Date:   Wed, 24 Aug 2016 13:50:53 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     kbuild test robot <fengguang.wu@...el.com>,
        "kbuild-all@...org" <kbuild-all@...org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: include/linux/io-mapping.h:130:39: error: implicit declaration of
 function 'ioremap_wc'

On Tue, Aug 23, 2016 at 10:03 PM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> On Tue, Aug 16, 2016 at 10:14:57AM +0200, Linus Walleij wrote:
>> On Mon, Aug 15, 2016 at 5:08 PM, kbuild test robot

>> I think I've finally fixed this now by making OF_GPIO depend on !NO_IOMEM.
>
> I've stumbled over this patch

(...)
>     Fix this by including <linux/io-mapping.h> explicitly.
>
> having touched io-mapping.h
>
> The original patch is incorrect as io-mapping.h is not the right header
> for iounmap() - that is #include <linux/io.h> (pulling in <asm/io.h>)
> which is (and was) already present.

You're right, I'll revert this patch.

> So the root cause here is arch/um not supplying enough stubs?

arch/um is explicitly not supporting IOMEM so anyone code
using iomap()/iounmap() have to make sure they do not get
compiled on UM.

> But in the
> meantime, do you mind removing the incorrect include now that you have a
> w/a to keep 0day quiet? :)

OK

Yours,
Linus Walleij