[xlnx:xlnx_rebase_v5.10 625/1760] drivers/of/configfs.c:134:9: warning: no previous prototype for function 'cfs_overlay_item_dtbo_read'

[kernel test robot]

tree:   https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.10
head:   bf98c1493fb23bfd7e2678498b7e337ce2cd1d53
commit: e6de170decc96254704d77b4726ad658c6a2f42c [625/1760] OF: DT-Overlay configfs interface (v8)
config: s390-randconfig-r011-20210812 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 767496d19cb9a1fbba57ff08095faa161998ee36)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://github.com/Xilinx/linux-xlnx/commit/e6de170decc96254704d77b4726ad658c6a2f42c
        git remote add xlnx https://github.com/Xilinx/linux-xlnx
        git fetch --no-tags xlnx xlnx_rebase_v5.10
        git checkout e6de170decc96254704d77b4726ad658c6a2f42c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> drivers/of/configfs.c:134:9: warning: no previous prototype for function 'cfs_overlay_item_dtbo_read' [-Wmissing-prototypes]
   ssize_t cfs_overlay_item_dtbo_read(struct config_item *item,
           ^
   drivers/of/configfs.c:134:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   ssize_t cfs_overlay_item_dtbo_read(struct config_item *item,
   ^
   static 
>> drivers/of/configfs.c:156:9: warning: no previous prototype for function 'cfs_overlay_item_dtbo_write' [-Wmissing-prototypes]
   ssize_t cfs_overlay_item_dtbo_write(struct config_item *item,
           ^
   drivers/of/configfs.c:156:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   ssize_t cfs_overlay_item_dtbo_write(struct config_item *item,
   ^
   static 
   2 warnings generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for MFD_SUN6I_PRCM
   Depends on HAS_IOMEM && (ARCH_SUNXI || COMPILE_TEST
   Selected by
   - CLK_SUNXI_PRCM_SUN6I && COMMON_CLK && CLK_SUNXI
   - CLK_SUNXI_PRCM_SUN8I && COMMON_CLK && CLK_SUNXI


vim +/cfs_overlay_item_dtbo_read +134 drivers/of/configfs.c

   133	
 > 134	ssize_t cfs_overlay_item_dtbo_read(struct config_item *item,
   135					   void *buf, size_t max_count)
   136	{
   137		struct cfs_overlay_item *overlay = to_cfs_overlay_item(item);
   138	
   139		pr_debug("%s: buf=%p max_count=%zu\n", __func__, buf, max_count);
   140	
   141		if (!overlay->dtbo)
   142			return 0;
   143	
   144		/* copy if buffer provided */
   145		if (buf) {
   146			/* the buffer must be large enough */
   147			if (overlay->dtbo_size > max_count)
   148				return -ENOSPC;
   149	
   150			memcpy(buf, overlay->dtbo, overlay->dtbo_size);
   151		}
   152	
   153		return overlay->dtbo_size;
   154	}
   155	
 > 156	ssize_t cfs_overlay_item_dtbo_write(struct config_item *item,
   157					    const void *buf, size_t count)
   158	{
   159		struct cfs_overlay_item *overlay = to_cfs_overlay_item(item);
   160		int err;
   161	
   162		/* if it's set do not allow changes */
   163		if (overlay->path[0] != '\0' || overlay->dtbo_size > 0)
   164			return -EPERM;
   165	
   166		/* copy the contents */
   167		overlay->dtbo = kmemdup(buf, count, GFP_KERNEL);
   168		if (!overlay->dtbo)
   169			return -ENOMEM;
   170	
   171		overlay->dtbo_size = count;
   172	
   173		err = create_overlay(overlay, overlay->dtbo);
   174		if (err < 0)
   175			goto out_err;
   176	
   177		return count;
   178	
   179	out_err:
   180		kfree(overlay->dtbo);
   181		overlay->dtbo = NULL;
   182		overlay->dtbo_size = 0;
   183	
   184		return err;
   185	}
   186	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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