tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4333a9b0b67bb4e8bcd91bdd80da80b0ec151162
commit: a66ada4f241c9a5a0bbabc5af511ea5dd4c2cbb8 usb: gadget: bcm63xx_udc: create debugfs directory under usb root
date:   7 months ago
config: mips-randconfig-r015-20200621 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project f5bbe390d23d7da0ffb110cdb24b583c2dc87eba)
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 mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        git checkout a66ada4f241c9a5a0bbabc5af511ea5dd4c2cbb8
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

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

All errors (new ones prefixed by >>):

>> drivers/usb/gadget/udc/bcm63xx_udc.c:2251:46: error: use of undeclared identifier 'usb_debug_root'
           root = debugfs_create_dir(udc->gadget.name, usb_debug_root);
                                                       ^
   1 error generated.

vim +/usb_debug_root +2251 drivers/usb/gadget/udc/bcm63xx_udc.c

  2239	
  2240	/**
  2241	 * bcm63xx_udc_init_debugfs - Create debugfs entries.
  2242	 * @udc: Reference to the device controller.
  2243	 */
  2244	static void bcm63xx_udc_init_debugfs(struct bcm63xx_udc *udc)
  2245	{
  2246		struct dentry *root;
  2247	
  2248		if (!IS_ENABLED(CONFIG_USB_GADGET_DEBUG_FS))
  2249			return;
  2250	
> 2251		root = debugfs_create_dir(udc->gadget.name, usb_debug_root);
  2252		udc->debugfs_root = root;
  2253	
  2254		debugfs_create_file("usbd", 0400, root, udc, &bcm63xx_usbd_dbg_fops);
  2255		debugfs_create_file("iudma", 0400, root, udc, &bcm63xx_iudma_dbg_fops);
  2256	}
  2257	

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