linux-kernel - Re: [jic23-iio:testing 124/129] drivers/iio/accel/msa311.c:993:24: warning: format specifies type 'unsigned char' but the argument has type 'unsigned int'

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Date:   Tue, 30 Aug 2022 11:03:29 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     kernel test robot <lkp@...el.com>
CC:     Dmitry Rokosov <DDRokosov@...rdevices.ru>, <llvm@...ts.linux.dev>,
        <kbuild-all@...ts.01.org>, <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [jic23-iio:testing 124/129] drivers/iio/accel/msa311.c:993:24:
 warning: format specifies type 'unsigned char' but the argument has type
 'unsigned int'

On Mon, 29 Aug 2022 06:25:53 +0800
kernel test robot <lkp@...el.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git testing
> head:   fc32c348a52157665cd8f3f060669ef4e8a03cd4
> commit: 1a622d75985c5950a470edc50c7ad7c10e79a1d3 [124/129] iio: add MEMSensing MSA311 3-axis accelerometer driver
> config: powerpc-randconfig-r024-20220829 (https://download.01.org/0day-ci/archive/20220829/202208290618.wU7mHfOp-lkp@intel.com/config)
> compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project a2100daf12fb980a29fd1a9c85ccf8eaaaf79730)
> 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 powerpc cross compiling tool for clang build
>         # apt-get install binutils-powerpc-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/commit/?id=1a622d75985c5950a470edc50c7ad7c10e79a1d3
>         git remote add jic23-iio https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git
>         git fetch --no-tags jic23-iio testing
>         git checkout 1a622d75985c5950a470edc50c7ad7c10e79a1d3
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash drivers/iio/accel/
> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
> >> drivers/iio/accel/msa311.c:993:24: warning: format specifies type 'unsigned char' but the argument has type 'unsigned int' [-Wformat]  
>                                               "msa311-%hhx", partid);
>                                                       ~~~~   ^~~~~~
>                                                       %x
>    1 warning generated.
> 
> 
> vim +993 drivers/iio/accel/msa311.c
> 
>    977	
>    978	static int msa311_check_partid(struct msa311_priv *msa311)
>    979	{
>    980		struct device *dev = msa311->dev;
>    981		unsigned int partid;
>    982		int err;
>    983	
>    984		err = regmap_read(msa311->regs, MSA311_PARTID_REG, &partid);
>    985		if (err)
>    986			return dev_err_probe(dev, err, "failed to read partid\n");
>    987	
>    988		if (partid != MSA311_WHO_AM_I)
>    989			dev_warn(dev, "invalid partid (%#x), expected (%#x)\n",
>    990				 partid, MSA311_WHO_AM_I);
>    991	
>    992		msa311->chip_name = devm_kasprintf(dev, GFP_KERNEL,
>  > 993						   "msa311-%hhx", partid);  

Dmitry,

I'm thinking intent here was to limit range of what was printed. Maybe better to use
local u8 variable or cast?

I can fix it up if that's fine with you - or even better send me a patch that fixes
it however you prefer!

Jonathan


>    994		if (!msa311->chip_name)
>    995			return dev_err_probe(dev, -ENOMEM, "can't alloc chip name\n");
>    996	
>    997		return 0;
>    998	}
>    999	
>