Hi Goffredo,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on kdave/for-next]
[also build test WARNING on v5.11-rc3 next-20210115]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Goffredo-Baroncelli/Add-an-ioctl-to-set-the-device-properties/20210118-035442
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next
config: arm64-randconfig-s032-20210118 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-208-g46a52ca4-dirty
        # https://github.com/0day-ci/linux/commit/6e3781fa16beb22201a3dac33326357fc0a0b7b9
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Goffredo-Baroncelli/Add-an-ioctl-to-set-the-device-properties/20210118-035442
        git checkout 6e3781fa16beb22201a3dac33326357fc0a0b7b9
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>


"sparse warnings: (new ones prefixed by >>)"
   fs/btrfs/tests/btrfs-tests.c: note: in included file:

quoted

fs/btrfs/tests/../volumes.h:367:33: sparse: sparse: dubious one-bit signed bitfield

--
   fs/btrfs/tests/inode-tests.c: note: in included file:

quoted

fs/btrfs/tests/../volumes.h:367:33: sparse: sparse: dubious one-bit signed bitfield

--
   fs/btrfs/tests/extent-map-tests.c: note: in included file:

quoted

fs/btrfs/tests/../volumes.h:367:33: sparse: sparse: dubious one-bit signed bitfield

vim +367 fs/btrfs/tests/../volumes.h

cea9e4452ebaf18d Chris Mason         2008-04-09  361  
b2117a39fa96cf48 Miao Xie            2011-01-05  362  struct btrfs_device_info {
b2117a39fa96cf48 Miao Xie            2011-01-05  363  	struct btrfs_device *dev;
b2117a39fa96cf48 Miao Xie            2011-01-05  364  	u64 dev_offset;
b2117a39fa96cf48 Miao Xie            2011-01-05  365  	u64 max_avail;
73c5de0051533cbd Arne Jansen         2011-04-12  366  	u64 total_avail;
6e3781fa16beb222 Goffredo Baroncelli 2021-01-17 @367  	int preferred_metadata:1;
b2117a39fa96cf48 Miao Xie            2011-01-05  368  };
b2117a39fa96cf48 Miao Xie            2011-01-05  369  

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