Hi,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   049ec1b5a76d34a6980cccdb7c0baeb4eed7a993
commit: ca668f0edfae65438c3f0a3ad5d3e59e3515915f mfd: syscon: Set regmap max_register in of_syscon_register
date:   3 months ago
config: um-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430
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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