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

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  include/linux/io-mapping.h:130:39: error: implicit declaration of  function 'ioremap_wc' kbuild test robot <fengguang.wu@intel.com> - 2016-08-07 09:00 +0200
    Re: include/linux/io-mapping.h:130:39: error: implicit declaration of  function 'ioremap_wc' Linus Walleij <linus.walleij@linaro.org> - 2016-08-10 21:30 +0200

#1457436 — include/linux/io-mapping.h:130:39: error: implicit declaration of function 'ioremap_wc'

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Hi Linus,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0cbbc422d56668528f6efd1234fe908010284082
commit: 7d4defe21c682c934a19fce1ba8b54b7bde61b08 gpio: include <linux/io-mapping.h> in gpiolib-of
date:   9 weeks ago
config: um-allyesconfig (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        git checkout 7d4defe21c682c934a19fce1ba8b54b7bde61b08
        # save the attached .config to linux build tree
        make ARCH=um 

All errors (new ones prefixed by >>):

   In file included from drivers/gpio/gpiolib-of.c:19:0:
   include/linux/io-mapping.h: In function 'io_mapping_create_wc':
>> include/linux/io-mapping.h:130:39: error: implicit declaration of function 'ioremap_wc' [-Werror=implicit-function-declaration]
     return (struct io_mapping __force *) ioremap_wc(base, size);
                                          ^~~~~~~~~~
   include/linux/io-mapping.h:130:9: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     return (struct io_mapping __force *) ioremap_wc(base, size);
            ^
   include/linux/io-mapping.h: In function 'io_mapping_free':
>> include/linux/io-mapping.h:136:2: error: implicit declaration of function 'iounmap' [-Werror=implicit-function-declaration]
     iounmap((void __force __iomem *) mapping);
     ^~~~~~~
   cc1: some warnings being treated as errors

vim +/ioremap_wc +130 include/linux/io-mapping.h

4ab0d47d Venkatesh Pallipadi 2009-02-24  124  struct io_mapping;
4ab0d47d Venkatesh Pallipadi 2009-02-24  125  
e5beae16 Keith Packard       2008-11-03  126  /* Create the io_mapping object*/
9663f2e6 Keith Packard       2008-10-30  127  static inline struct io_mapping *
4ab0d47d Venkatesh Pallipadi 2009-02-24  128  io_mapping_create_wc(resource_size_t base, unsigned long size)
9663f2e6 Keith Packard       2008-10-30  129  {
29bc17ec Francisco Jerez     2010-09-04 @130  	return (struct io_mapping __force *) ioremap_wc(base, size);
9663f2e6 Keith Packard       2008-10-30  131  }
9663f2e6 Keith Packard       2008-10-30  132  
9663f2e6 Keith Packard       2008-10-30  133  static inline void
9663f2e6 Keith Packard       2008-10-30  134  io_mapping_free(struct io_mapping *mapping)
9663f2e6 Keith Packard       2008-10-30  135  {
29bc17ec Francisco Jerez     2010-09-04 @136  	iounmap((void __force __iomem *) mapping);
9663f2e6 Keith Packard       2008-10-30  137  }
9663f2e6 Keith Packard       2008-10-30  138  
9663f2e6 Keith Packard       2008-10-30  139  /* Atomic map/unmap */

:::::: The code at line 130 was first introduced by commit
:::::: 29bc17ecb856ffb2b47c7009a71971c6f9334205 io-mapping: Fix the address space annotations

:::::: TO: Francisco Jerez <currojerez@riseup.net>
:::::: CC: Ingo Molnar <mingo@elte.hu>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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#1459661

On Sun, Aug 7, 2016 at 8:51 AM, kbuild test robot
<fengguang.wu@intel.com> wrote:

> FYI, the error/warning still remains.
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   0cbbc422d56668528f6efd1234fe908010284082
> commit: 7d4defe21c682c934a19fce1ba8b54b7bde61b08 gpio: include <linux/io-mapping.h> in gpiolib-of
> date:   9 weeks ago
> config: um-allyesconfig (attached as .config)
> compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
> reproduce:
>         git checkout 7d4defe21c682c934a19fce1ba8b54b7bde61b08
>         # save the attached .config to linux build tree
>         make ARCH=um
>
> All errors (new ones prefixed by >>):
>
>    In file included from drivers/gpio/gpiolib-of.c:19:0:
>    include/linux/io-mapping.h: In function 'io_mapping_create_wc':
>>> include/linux/io-mapping.h:130:39: error: implicit declaration of function 'ioremap_wc' [-Werror=implicit-function-declaration]
>      return (struct io_mapping __force *) ioremap_wc(base, size);
>                                           ^~~~~~~~~~
>    include/linux/io-mapping.h:130:9: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
>      return (struct io_mapping __force *) ioremap_wc(base, size);
>             ^
>    include/linux/io-mapping.h: In function 'io_mapping_free':
>>> include/linux/io-mapping.h:136:2: error: implicit declaration of function 'iounmap' [-Werror=implicit-function-declaration]
>      iounmap((void __force __iomem *) mapping);
>      ^~~~~~~
>    cc1: some warnings being treated as errors
>
> vim +/ioremap_wc +130 include/linux/io-mapping.h

I have tried to fix this but don't know what the problem really is,
as all archs seem to work fine except UM. I need help with this :/

Involving the linux-gpio list...

Yours,
Linus Walleij

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