linux-kernel - fs/ext4/orphan.c:78:18: sparse: sparse: cast from restricted _

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Message-ID: <202111210525.5qaadtY1-lkp@intel.com>
Date:   Sun, 21 Nov 2021 05:03:28 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jan Kara <jack@...e.cz>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Theodore Ts'o <tytso@....edu>,
        Lukas Czerner <lczerner@...hat.com>
Subject: fs/ext4/orphan.c:78:18: sparse: sparse: cast from restricted __le32

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   a90af8f15bdc9449ee2d24e1d73fa3f7e8633f81
commit: 4a79a98c7b19dd3d4cfe9200fbc384ba9119e039 ext4: Improve scalability of ext4 orphan file handling
date:   3 months ago
config: sparc64-randconfig-s031-20211116 (attached as .config)
compiler: sparc64-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/torvalds/linux.git/commit/?id=4a79a98c7b19dd3d4cfe9200fbc384ba9119e039
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 4a79a98c7b19dd3d4cfe9200fbc384ba9119e039
        # 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=sparc64 SHELL=/bin/bash drivers/usb/host/ fs/ext4/ lib/

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/ext4/orphan.c:78:18: sparse: sparse: cast from restricted __le32
>> fs/ext4/orphan.c:78:18: sparse: sparse: cast from restricted __le32
>> fs/ext4/orphan.c:78:18: sparse: sparse: cast to restricted __le32

vim +78 fs/ext4/orphan.c

    10	
    11	static int ext4_orphan_file_add(handle_t *handle, struct inode *inode)
    12	{
    13		int i, j, start;
    14		struct ext4_orphan_info *oi = &EXT4_SB(inode->i_sb)->s_orphan_info;
    15		int ret = 0;
    16		bool found = false;
    17		__le32 *bdata;
    18		int inodes_per_ob = ext4_inodes_per_orphan_block(inode->i_sb);
    19		int looped = 0;
    20	
    21		/*
    22		 * Find block with free orphan entry. Use CPU number for a naive hash
    23		 * for a search start in the orphan file
    24		 */
    25		start = raw_smp_processor_id()*13 % oi->of_blocks;
    26		i = start;
    27		do {
    28			if (atomic_dec_if_positive(&oi->of_binfo[i].ob_free_entries)
    29			    >= 0) {
    30				found = true;
    31				break;
    32			}
    33			if (++i >= oi->of_blocks)
    34				i = 0;
    35		} while (i != start);
    36	
    37		if (!found) {
    38			/*
    39			 * For now we don't grow or shrink orphan file. We just use
    40			 * whatever was allocated at mke2fs time. The additional
    41			 * credits we would have to reserve for each orphan inode
    42			 * operation just don't seem worth it.
    43			 */
    44			return -ENOSPC;
    45		}
    46	
    47		ret = ext4_journal_get_write_access(handle, inode->i_sb,
    48					oi->of_binfo[i].ob_bh, EXT4_JTR_ORPHAN_FILE);
    49		if (ret) {
    50			atomic_inc(&oi->of_binfo[i].ob_free_entries);
    51			return ret;
    52		}
    53	
    54		bdata = (__le32 *)(oi->of_binfo[i].ob_bh->b_data);
    55		/* Find empty slot in a block */
    56		j = 0;
    57		do {
    58			if (looped) {
    59				/*
    60				 * Did we walk through the block several times without
    61				 * finding free entry? It is theoretically possible
    62				 * if entries get constantly allocated and freed or
    63				 * if the block is corrupted. Avoid indefinite looping
    64				 * and bail. We'll use orphan list instead.
    65				 */
    66				if (looped > 3) {
    67					atomic_inc(&oi->of_binfo[i].ob_free_entries);
    68					return -ENOSPC;
    69				}
    70				cond_resched();
    71			}
    72			while (bdata[j]) {
    73				if (++j >= inodes_per_ob) {
    74					j = 0;
    75					looped++;
    76				}
    77			}
  > 78		} while (cmpxchg(&bdata[j], (__le32)0, cpu_to_le32(inode->i_ino)) !=
    79			 (__le32)0);
    80	
    81		EXT4_I(inode)->i_orphan_idx = i * inodes_per_ob + j;
    82		ext4_set_inode_state(inode, EXT4_STATE_ORPHAN_FILE);
    83	
    84		return ext4_handle_dirty_metadata(handle, NULL, oi->of_binfo[i].ob_bh);
    85	}
    86	

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

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