[renesas-drivers:topic/renesas-overlays 2/85] drivers/of/configfs.c:48:2: error: implicit declaration of function 'of_fdt_unflatten_tree'

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git topic/renesas-overlays
head:   c62872358e9767f9b0d00fa4b023484d59e4ba65
commit: 3cc2e4a7426c6f0d2e4de08283737840ed495779 [2/85] OF: DT-Overlay configfs interface (v7)
config: sparc64-allyesconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 5.4.0-6) 5.4.0 20160609
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 3cc2e4a7426c6f0d2e4de08283737840ed495779
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

All errors (new ones prefixed by >>):

   drivers/of/configfs.c: In function 'create_overlay':
>> drivers/of/configfs.c:48:2: error: implicit declaration of function 'of_fdt_unflatten_tree' [-Werror=implicit-function-declaration]
     of_fdt_unflatten_tree(blob, NULL, &overlay->overlay);
     ^
   In file included from include/linux/kernel.h:13:0,
                    from include/linux/list.h:8,
                    from include/linux/kobject.h:20,
                    from include/linux/device.h:17,
                    from include/linux/node.h:17,
                    from include/linux/cpu.h:16,
                    from drivers/of/configfs.c:12:
   drivers/of/configfs.c: In function 'cfs_overlay_item_dtbo_read':
   drivers/of/configfs.c:153:11: warning: format '%u' expects argument of type 'unsigned int', but argument 5 has type 'size_t {aka long unsigned int}' [-Wformat=]
     pr_debug("%s: buf=%p max_count=%u\n", __func__,
              ^
   include/linux/printk.h:260:21: note: in definition of macro 'pr_fmt'
    #define pr_fmt(fmt) fmt
                        ^
   include/linux/printk.h:326:2: note: in expansion of macro 'dynamic_pr_debug'
     dynamic_pr_debug(fmt, ##__VA_ARGS__)
     ^
   drivers/of/configfs.c:153:2: note: in expansion of macro 'pr_debug'
     pr_debug("%s: buf=%p max_count=%u\n", __func__,
     ^
   cc1: some warnings being treated as errors

vim +/of_fdt_unflatten_tree +48 drivers/of/configfs.c

    42	
    43	static int create_overlay(struct cfs_overlay_item *overlay, void *blob)
    44	{
    45		int err;
    46	
    47		/* unflatten the tree */
  > 48		of_fdt_unflatten_tree(blob, NULL, &overlay->overlay);
    49		if (overlay->overlay == NULL) {
    50			pr_err("%s: failed to unflatten tree\n", __func__);
    51			err = -EINVAL;

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