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

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Date:   Mon, 26 Jul 2021 12:09:37 +0300
From:   Michael Zaidman <michael.zaidman@...il.com>
To:     kernel test robot <lkp@...el.com>, Jiri Kosina <jkosina@...e.cz>
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: Re: drivers/hid/hid-ft260.c:794:44: warning: format specifies type
 'short' but the argument has type 'int'

On Mon, Jul 26, 2021 at 11:07:07AM +0800, kernel test robot wrote:
> Hi Michael,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   ff1176468d368232b684f75e82563369208bc371
> commit: 6a82582d9fa438045191074856f47165334f2777 HID: ft260: add usb hid to i2c host bridge driver
> date:   4 months ago
> config: arm64-randconfig-r022-20210726 (attached as .config)
> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project c63dbd850182797bc4b76124d08e1c320ab2365d)
> 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 ARCH=arm64 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.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

The fix was discussed and submitted on May 10 in this commit
https://patchwork.kernel.org/project/linux-input/patch/20210510163428.2415-1-michael.zaidman@gmail.com/
But I see that it was not taken into v5.13.
Jiri, could you please comment?

Thanks,
Michael