tree: https://git.kernel.org/pub/scm/linux/kernel/git/xiang/linux.git erofs/chunk head: a915f0e209270389efab942fcd446e31a98c4062 commit: a915f0e209270389efab942fcd446e31a98c4062 [8/8] erofs: support reading chunk-based files config: x86_64-randconfig-s021-20210816 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-348-gf0e6938b-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/xiang/linux.git/commit/?i... git remote add xiang-linux https://git.kernel.org/pub/scm/linux/kernel/git/xiang/linux.git git fetch --no-tags xiang-linux erofs/chunk git checkout a915f0e209270389efab942fcd446e31a98c4062 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash fs/erofs/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) vim +136 fs/erofs/data.c 80 81 static int erofs_map_blocks(struct inode *inode, 82 struct erofs_map_blocks *map, int flags) 83 { 84 struct super_block *sb = inode->i_sb; 85 struct erofs_inode *vi = EROFS_I(inode); 86 struct erofs_inode_chunk_index *idx; 87 struct page *page; 88 u64 chunknr; 89 unsigned int unit; 90 erofs_off_t pos; 91 int err; 92 93 if (map->m_la >= inode->i_size) { 94 map->m_flags = 0; 95 map->m_plen = 0; 96 goto out; 97 } 98 99 if (vi->datalayout != EROFS_INODE_CHUNK_BASED) 100 return erofs_map_blocks_flatmode(inode, map, flags); 101 102 if (vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES) 103 unit = sizeof(*idx); /* chunk index */ 104 else 105 unit = 4; /* chunk index */ 106 107 chunknr = map->m_la >> vi->chunkbits; 108 pos = ALIGN(iloc(EROFS_SB(sb), vi->nid) + vi->inode_isize + 109 vi->xattr_isize, unit) + unit * chunknr; 110 111 page = erofs_get_meta_page(inode->i_sb, erofs_blknr(pos)); 112 if (IS_ERR(page)) 113 return PTR_ERR(page); 114 115 err = 0; 116 map->m_plen = min_t(erofs_off_t, 1 << vi->chunkbits, 117 inode->i_size - map->m_la); 118 if (!(vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES)) { 119 __le32 *blkaddr = page_address(page) + erofs_blkoff(pos); 120 121 if (le32_to_cpu(*blkaddr) == EROFS_NULL_ADDR) { 122 map->m_flags = 0; 123 } else { 124 map->m_pa = blknr_to_addr(le32_to_cpu(*blkaddr)); 125 map->m_flags = EROFS_MAP_MAPPED; 126 } 127 goto out_unlock; 128 } 129 idx = page_address(page) + erofs_blkoff(pos); 130 switch (le32_to_cpu(idx->blkaddr)) { 131 case EROFS_NULL_ADDR: 132 map->m_flags = 0; 133 break; 134 default: 135 if (idx->device_id) { 137 le32_to_cpu(idx->device_id), 138 chunknr, vi->nid); 139 err = -EINVAL; 140 goto out; 141 } 142 map->m_pa = blknr_to_addr(le32_to_cpu(idx->blkaddr)); 143 map->m_flags = EROFS_MAP_MAPPED; 144 break; 145 } 146 out_unlock: 147 unlock_page(page); 148 put_page(page); 149 out: 150 map->m_llen = map->m_plen; 151 return err; 152 } 153 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org