Hi Holger,

[auto build test ERROR on char-misc/char-misc-testing]
[also build test ERROR on v4.9]
[cannot apply to ljones-mfd/for-mfd-next next-20161213]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Holger-Dengler/Eberspaecher-Flexcard-PMC-II-base-support/20161214-082350
config: i386-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/misc/flexcard_misc.c: In function 'serialno_show':
>> drivers/misc/flexcard_misc.c:70:10: error: implicit declaration of function 'readq' [-Werror=implicit-function-declaration]
     fc_sn = readq(&priv->conf->fc_sn);
             ^~~~~
   cc1: some warnings being treated as errors

vim +/readq +70 drivers/misc/flexcard_misc.c

    64	static ssize_t serialno_show(struct device *dev,
    65				     struct device_attribute *attr, char *buf)
    66	{
    67		struct flexcard_misc *priv = dev_get_drvdata(dev);
    68		u64 fc_sn;
    69	
  > 70		fc_sn = readq(&priv->conf->fc_sn);
    71		return sprintf(buf, "%lld\n", fc_sn);
    72	}
    73	static DEVICE_ATTR_RO(serialno);

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