[axboe-block:pipe-nonblock.2 1/2] fs/splice.c:60:19: sparse: sparse: cast from restricted fmode_t

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git pipe-nonblock.2
head:   09ad5feff1f4b3d12bf6a5aabf6752401043c471
commit: f10cbebf4dd7f77b0e87c77bb0191a5a07d5e7ac [1/2] splice: clear FMODE_NOWAIT on file if splice/vmsplice is used
config: m68k-randconfig-s033-20230423 (https://download.01.org/0day-ci/archive/20230425/202304251604.SwJpFdA1-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 12.1.0
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: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?id=f10cbebf4dd7f77b0e87c77bb0191a5a07d5e7ac
        git remote add axboe-block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
        git fetch --no-tags axboe-block pipe-nonblock.2
        git checkout f10cbebf4dd7f77b0e87c77bb0191a5a07d5e7ac
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=m68k olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=m68k SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304251604.SwJpFdA1-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/splice.c:60:19: sparse: sparse: cast from restricted fmode_t
>> fs/splice.c:60:19: sparse: sparse: cast from restricted fmode_t
>> fs/splice.c:60:19: sparse: sparse: cast to restricted fmode_t

vim +60 fs/splice.c

    39	
    40	/*
    41	 * Splice doesn't support FMODE_NOWAIT. Since pipes may set this flag to
    42	 * indicate they support non-blocking reads or writes, we must clear it
    43	 * here if set to avoid blocking other users of this pipe if splice is
    44	 * being done on it.
    45	 */
    46	static void pipe_clear_nowait(struct file *file)
    47	{
    48		fmode_t new_fmode, old_fmode;
    49	
    50		/*
    51		 * We could get by with just doing an xchg() here as f_mode should
    52		 * not change in the file's lifetime, but let's be safe and use
    53		 * a cmpxchg() instead.
    54		 */
    55		do {
    56			old_fmode = READ_ONCE(file->f_mode);
    57			if (!(old_fmode & FMODE_NOWAIT))
    58				break;
    59			new_fmode = old_fmode & ~FMODE_NOWAIT;
  > 60		} while (!try_cmpxchg(&file->f_mode, &old_fmode, new_fmode));
    61	}
    62	

-- 
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