Re: 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
[off-list ref] 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':

quoted

quoted

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':

quoted

quoted

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