drivers/mfd/syscon.c:67:9: error: implicit declaration of function 'ioremap'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   de06dbfa7861c9019eedefc0c356ba86e5098f1b
commit: ca668f0edfae65438c3f0a3ad5d3e59e3515915f mfd: syscon: Set regmap 
max_register in of_syscon_register
date:   4 days ago
config: um-allyesconfig (attached as .config)
reproduce:
        git checkout ca668f0edfae65438c3f0a3ad5d3e59e3515915f
        # save the attached .config to linux build tree
        make ARCH=um 

All errors (new ones prefixed by >>):

   drivers/mfd/syscon.c: In function 'of_syscon_register':
>> drivers/mfd/syscon.c:67:9: error: implicit declaration of function 'ioremap' 
>> [-Werror=implicit-function-declaration]
     base = ioremap(res.start, resource_size(&res));
            ^
   drivers/mfd/syscon.c:67:7: warning: assignment makes pointer from integer 
without a cast [-Wint-conversion]
     base = ioremap(res.start, resource_size(&res));
          ^
   drivers/mfd/syscon.c:109:2: error: implicit declaration of function 
'iounmap' [-Werror=implicit-function-declaration]
     iounmap(base);
     ^
   cc1: some warnings being treated as errors

vim +/ioremap +67 drivers/mfd/syscon.c

    61  
    62          if (of_address_to_resource(np, 0, &res)) {
    63                  ret = -ENOMEM;
    64                  goto err_map;
    65          }
    66  
  > 67          base = ioremap(res.start, resource_size(&res));
    68          if (!base) {
    69                  ret = -ENOMEM;
    70                  goto err_map;

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.config.gz
Description: Binary data