linux-kernel - Re: drivers/hid/i2c-hid/i2c-hid-core.c:867:4: warning: format specifies type 'unsigned short' but the argument has type 'int'

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Message-ID: <CAD=FV=WkUEkkkfGa+6QJSBvj8EgVrnGYYbd6RrC_5HdTue=mDw@mail.gmail.com>
Date:   Tue, 28 Sep 2021 13:26:35 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     kernel test robot <lkp@...el.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        LKML <linux-kernel@...r.kernel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: drivers/hid/i2c-hid/i2c-hid-core.c:867:4: warning: format
 specifies type 'unsigned short' but the argument has type 'int'

Hi,

On Tue, Sep 28, 2021 at 1:16 PM kernel test robot <lkp@...el.com> wrote:
>
> Hi Douglas,
>
> First bad commit (maybe != root cause):
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   6fd3ec5c7af58d5d6b598fba22ac387645af33f4
> commit: b33752c300232d7f95dd9a4353947d0c9e6a0e52 HID: i2c-hid: Reorganize so ACPI and OF are separate modules
> date:   8 months ago
> config: arm64-randconfig-r016-20210927 (attached as .config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dc6e8dfdfe7efecfda318d43a06fae18b40eb498)
> 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=b33752c300232d7f95dd9a4353947d0c9e6a0e52
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout b33752c300232d7f95dd9a4353947d0c9e6a0e52
>         # 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@...el.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/hid/i2c-hid/i2c-hid-core.c:867:4: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat]
>                            le16_to_cpu(hdesc->bcdVersion));
>                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    include/linux/dev_printk.h:112:32: note: expanded from macro 'dev_err'
>            _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
>                                  ~~~     ^~~~~~~~~~~
>    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)) ?     \
>            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Definitely not something new introduced by my commit. Also seems like
something wrong in the compiler or in the generic Linux header files?
It sure seems like if you call le16_to_cpu() you should be able to
assume that the type is "unsigned short" and not "int".

-Doug