linux-kernel - [djwong-xfs:zero-initialize-pmem-5.16 18/28] fs/xfs/libxfs/xfs_ialloc_btree.c:552:53: sparse: sparse: cast truncates bits from constant value (100000000 becomes 0)

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Date:   Fri, 22 Oct 2021 14:21:48 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Darrick J. Wong" <djwong@...nel.org>
Cc:     kbuild-all@...ts.01.org,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-kernel@...r.kernel.org
Subject: [djwong-xfs:zero-initialize-pmem-5.16 18/28]
 fs/xfs/libxfs/xfs_ialloc_btree.c:552:53: sparse: sparse: cast truncates bits
 from constant value (100000000 becomes 0)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git zero-initialize-pmem-5.16
head:   34b80c3d1203abd5fd64242ef25898c7d64166ca
commit: c0ef00d1e835bfd24399aaa069b2b608dd60b485 [18/28] xfs: check absolute maximum nlevels for each btree type
config: csky-randconfig-s032-20211008 (attached as .config)
compiler: csky-linux-gcc (GCC) 11.2.0
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-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git/commit/?id=c0ef00d1e835bfd24399aaa069b2b608dd60b485
        git remote add djwong-xfs https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git
        git fetch --no-tags djwong-xfs zero-initialize-pmem-5.16
        git checkout c0ef00d1e835bfd24399aaa069b2b608dd60b485
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=csky SHELL=/bin/bash fs/xfs/ mm/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)
   fs/xfs/libxfs/xfs_ialloc_btree.c: note: in included file (through include/linux/bitops.h, include/linux/kernel.h, include/linux/list.h, ...):
   arch/csky/include/asm/bitops.h:77:9: sparse: sparse: preprocessor token __clear_bit redefined
   fs/xfs/libxfs/xfs_ialloc_btree.c: note: in included file (through arch/csky/include/asm/bitops.h, include/linux/bitops.h, include/linux/kernel.h, ...):
   include/asm-generic/bitops/non-atomic.h:34:9: sparse: this was the original definition
>> fs/xfs/libxfs/xfs_ialloc_btree.c:552:53: sparse: sparse: cast truncates bits from constant value (100000000 becomes 0)

vim +552 fs/xfs/libxfs/xfs_ialloc_btree.c

   543	
   544	unsigned int
   545	xfs_inobt_absolute_maxlevels(void)
   546	{
   547		unsigned int		minrecs[2];
   548	
   549		xfs_btree_absolute_minrecs(minrecs, 0, sizeof(xfs_inobt_rec_t),
   550				sizeof(xfs_inobt_key_t) + sizeof(xfs_inobt_ptr_t));
   551	
 > 552		return xfs_btree_compute_maxlevels(minrecs, XFS_MAX_AG_INODES);
   553	}
   554	

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

Download attachment ".config.gz" of type "application/gzip" (43471 bytes)