Hi Heinrich,

[auto build test ERROR on linus/master]
[also build test ERROR on next-20161216]
[cannot apply to glikely/devicetree/next robh/for-next v4.9]
[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/Heinrich-Schuchardt/of-overlay-sysfs-based-ABI-for-dt-overlays/20161219-093606
config: i386-randconfig-s1-201651 (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 >>):

   In file included from include/linux/irqdomain.h:34:0,
                    from include/linux/i2c.h:33,
                    from include/uapi/linux/fb.h:5,
                    from include/linux/fb.h:5,
                    from include/linux/vga_switcheroo.h:34,
                    from drivers/gpu/drm/i915/i915_drv.c:40:
>> include/linux/of.h:1295:12: error: 'of_overlay_count' defined but not used [-Werror=unused-function]
    static int of_overlay_count(void)
               ^~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +/of_overlay_count +1295 include/linux/of.h

  1289	
  1290	int of_overlay_notifier_register(struct notifier_block *nb);
  1291	int of_overlay_notifier_unregister(struct notifier_block *nb);
  1292	
  1293	#else
  1294	
> 1295	static int of_overlay_count(void)
  1296	{
  1297		return -ENOTSUPP;
  1298	}

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