linux-kernel - fs/splice.c:53:19: sparse: sparse: cast from restricted fmode

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Message-ID: <202305092109.6raeJ4wr-lkp@intel.com>
Date:   Tue, 9 May 2023 21:55:34 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: fs/splice.c:53:19: sparse: sparse: cast from restricted fmode_t

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ba0ad6ed89fd5dada3b7b65ef2b08e95d449d4ab
commit: 0f99fc513ddd28de155c58547824a9fd63daacea splice: clear FMODE_NOWAIT on file if splice/vmsplice is used
date:   2 weeks ago
config: loongarch-randconfig-s052-20230507 (https://download.01.org/0day-ci/archive/20230509/202305092109.6raeJ4wr-lkp@intel.com/config)
compiler: loongarch64-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/torvalds/linux.git/commit/?id=0f99fc513ddd28de155c58547824a9fd63daacea
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 0f99fc513ddd28de155c58547824a9fd63daacea
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=loongarch olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=loongarch SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202305092109.6raeJ4wr-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/splice.c:53:19: sparse: sparse: cast from restricted fmode_t
>> fs/splice.c:53:19: sparse: sparse: cast from restricted fmode_t
>> fs/splice.c:53:19: sparse: sparse: cast to restricted fmode_t

vim +53 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 noinline void noinline pipe_clear_nowait(struct file *file)
    47	{
    48		fmode_t fmode = READ_ONCE(file->f_mode);
    49	
    50		do {
    51			if (!(fmode & FMODE_NOWAIT))
    52				break;
  > 53		} while (!try_cmpxchg(&file->f_mode, &fmode, fmode & ~FMODE_NOWAIT));
    54	}
    55	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests