Re: [PATCH 4/4] xfs: validate v5 feature fields

[kernel test robot <lkp@intel.com>]

Hi Dave,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on xfs-linux/for-next]
[also build test WARNING on next-20220429]
[cannot apply to v5.18-rc5]
[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/intel-lab-lkp/linux/commits/Dave-Chinner/xfs-fix-random-format-verification-issues/20220502-162206
base:   https://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git for-next
config: s390-randconfig-r032-20220501 (https://download.01.org/0day-ci/archive/20220502/202205022014.DmgdkxxR-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 09325d36061e42b495d1f4c7e933e260eac260ed)
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 s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/701c0cd0bdea877a997898941f62df6c05045f40
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Dave-Chinner/xfs-fix-random-format-verification-issues/20220502-162206
        git checkout 701c0cd0bdea877a997898941f62df6c05045f40
        # 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=s390 SHELL=/bin/bash fs/xfs/

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 >>):

>> fs/xfs/libxfs/xfs_sb.c:37:1: warning: no previous prototype for function 'xfs_sb_validate_v5_features' [-Wmissing-prototypes]
   xfs_sb_validate_v5_features(
   ^
   fs/xfs/libxfs/xfs_sb.c:36:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool
   ^
   static 
   1 warning generated.


vim +/xfs_sb_validate_v5_features +37 fs/xfs/libxfs/xfs_sb.c

    28	
    29	/*
    30	 * Physical superblock buffer manipulations. Shared with libxfs in userspace.
    31	 */
    32	
    33	/*
    34	 * Validate all the compulsory V4 feature bits are set on a V5 filesystem.
    35	 */
    36	bool
  > 37	xfs_sb_validate_v5_features(
    38		struct xfs_sb	*sbp)
    39	{
    40		/* We must not have any unknown V4 feature bits set */
    41		if (sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS)
    42			return false;
    43	
    44		/*
    45		 * The CRC bit is considered an invalid V4 flag, so we have to add it
    46		 * manually to the OKBITS mask.
    47		 */
    48		if (sbp->sb_features2 & ~(XFS_SB_VERSION2_OKBITS |
    49					  XFS_SB_VERSION2_CRCBIT))
    50			return false;
    51	
    52		/* Now check all the required V4 feature flags are set. */
    53	

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