Hi Michael,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d665ea6ea86c785760ee4bad4543dab3267ad074
commit: 6a82582d9fa438045191074856f47165334f2777 HID: ft260: add usb hid to i2c host bridge driver
date:   7 weeks ago
config: arm64-randconfig-r023-20210505 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8f5a2a5836cc8e4c1def2bdeb022e7b496623439)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6a82582d9fa438045191074856f47165334f2777
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 6a82582d9fa438045191074856f47165334f2777
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64 

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/hid/hid-ft260.c:515:59: warning: variable 'len' is uninitialized when used here [-Wuninitialized]
                   hid_err(hdev, "%s: unsupported wr len: %d\n", __func__, len);
                                                                           ^~~
   include/linux/hid.h:1190:30: note: expanded from macro 'hid_err'
           dev_err(&(hid)->dev, fmt, ##__VA_ARGS__)
                                       ^~~~~~~~~~~
   include/linux/dev_printk.h:112:32: note: expanded from macro 'dev_err'
           _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
                                         ^~~~~~~~~~~
   drivers/hid/hid-ft260.c:507:9: note: initialize the variable 'len' to silence this warning
           int len, ret;
                  ^
                   = 0
>> drivers/hid/hid-ft260.c:794:44: warning: format specifies type 'short' but the argument has type 'int' [-Wformat]
           return scnprintf(buf, PAGE_SIZE, "%hi\n", le16_to_cpu(*field));
                                             ~~~     ^~~~~~~~~~~~~~~~~~~
                                             %i
   include/linux/byteorder/generic.h:91:21: note: expanded from macro 'le16_to_cpu'
   #define le16_to_cpu __le16_to_cpu
                       ^
   include/uapi/linux/byteorder/big_endian.h:36:26: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/uapi/linux/swab.h:105:2: note: expanded from macro '__swab16'
           (__builtin_constant_p((__u16)(x)) ?     \
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   2 warnings generated.


vim +794 drivers/hid/hid-ft260.c

   784	
   785	static int ft260_word_show(struct hid_device *hdev, int id, u8 *cfg, int len,
   786				   u16 *field, u8 *buf)
   787	{
   788		int ret;
   789	
   790		ret = ft260_hid_feature_report_get(hdev, id, cfg, len);
   791		if (ret != len && ret >= 0)
   792			return -EIO;
   793	
 > 794		return scnprintf(buf, PAGE_SIZE, "%hi\n", le16_to_cpu(*field));
   795	}
   796	

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