drivers/hid/hid-ft260.c:794:44: warning: format specifies type 'short' but the argument has type 'int'

kernel test robot
2021-05-05T22:48:38Z

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Hi Michael,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 8404c9fbc84b741f66cff7d4934a25dd2c344452
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

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