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