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

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Date:   Tue, 23 Aug 2016 21:03:23 +0100
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Linus Walleij <linus.walleij@...aro.org>
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 16, 2016 at 10:14:57AM +0200, Linus Walleij wrote:
> On Mon, Aug 15, 2016 at 5:08 PM, kbuild test robot
> <fengguang.wu@...el.com> wrote:
> 
> > FYI, the error/warning still remains.
> 
> > commit: 7d4defe21c682c934a19fce1ba8b54b7bde61b08 gpio: include <linux/io-mapping.h> in gpiolib-of
> > config: um-allmodconfig (attached as .config)
> 
> I think I've finally fixed this now by making OF_GPIO depend on !NO_IOMEM.

I've stumbled over this patch

commit 7d4defe21c682c934a19fce1ba8b54b7bde61b08
Author: Linus Walleij <linus.walleij@...aro.org>
Date:   Wed Jun 8 10:58:20 2016 +0200

    gpio: include <linux/io-mapping.h> in gpiolib-of

    When enabling the gpiolib for all archs a build robot came
    up with this:
    
    All errors (new ones prefixed by >>):
    
       drivers/gpio/gpiolib-of.c: In function 'of_mm_gpiochip_add_data':
    >> drivers/gpio/gpiolib-of.c:317:2: error: implicit declaration of
       function 'iounmap' [-Werror=implicit-function-declaration]
         iounmap(mm_gc->regs);
         ^~~~~~~
       cc1: some warnings being treated as errors
    
    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.

So the root cause here is arch/um not supplying enough stubs? But in the
meantime, do you mind removing the incorrect include now that you have a
w/a to keep 0day quiet? :)
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre