[xilinx-xlnx:xlnx_rebase_v5.15_LTS 79/983] drivers/of/configfs.c:134:9: warning: no previous prototype for function 'cfs_overlay_item_dtbo_read'

[xilinx-xlnx:xlnx_rebase_v5.15_LTS 79/983] 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_v5.15_LTS
head:   82a6a288ad2ea30575c859f1a5ec2ad014e51528
commit: 92450eff19894419e326623c7b720e83aeb57b96 [79/983] OF: DT-Overlay configfs interface (v8)
config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220315/202203151317.g6Z6rKCh-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project a6b2f50fb47da3baeee10b1906da6e30ac5d26ec)
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
        # https://github.com/Xilinx/linux-xlnx/commit/92450eff19894419e326623c7b720e83aeb57b96
        git remote add xilinx-xlnx https://github.com/Xilinx/linux-xlnx
        git fetch --no-tags xilinx-xlnx xlnx_rebase_v5.15_LTS
        git checkout 92450eff19894419e326623c7b720e83aeb57b96
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/clk/ drivers/gpu/drm/xlnx/ drivers/media/platform/xilinx/ drivers/misc/ drivers/net/ethernet/xilinx/ drivers/of/ drivers/phy/xilinx/ drivers/ptp/

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


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	

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