Hi Gao, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on xiang-erofs/dev-test] [also build test WARNING on v5.15] [cannot apply to next-20211112] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Gao-Xiang/erofs-add-multiple-dev... base: https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git dev-test config: i386-randconfig-s002-20210928 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-dirty # https://github.com/0day-ci/linux/commit/5fd2e534e5f1ed05de1b7c46d55830c42... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Gao-Xiang/erofs-add-multiple-device-support/20210928-161752 git checkout 5fd2e534e5f1ed05de1b7c46d55830c422b09a3d # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 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 +139 fs/erofs/data.c 79 80 static int erofs_map_blocks(struct inode *inode, 81 struct erofs_map_blocks *map, int flags) 82 { 83 struct super_block *sb = inode->i_sb; 84 struct erofs_inode *vi = EROFS_I(inode); 85 struct erofs_inode_chunk_index *idx; 86 struct page *page; 87 u64 chunknr; 88 unsigned int unit; 89 erofs_off_t pos; 90 int err = 0; 91 92 map->m_deviceid = 0; 93 if (map->m_la >= inode->i_size) { 94 /* leave out-of-bound access unmapped */ 95 map->m_flags = 0; 96 map->m_plen = 0; 97 goto out; 98 } 99 100 if (vi->datalayout != EROFS_INODE_CHUNK_BASED) 101 return erofs_map_blocks_flatmode(inode, map, flags); 102 103 if (vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES) 104 unit = sizeof(*idx); /* chunk index */ 105 else 106 unit = EROFS_BLOCK_MAP_ENTRY_SIZE; /* block map */ 107 108 chunknr = map->m_la >> vi->chunkbits; 109 pos = ALIGN(iloc(EROFS_SB(sb), vi->nid) + vi->inode_isize + 110 vi->xattr_isize, unit) + unit * chunknr; 111 112 page = erofs_get_meta_page(inode->i_sb, erofs_blknr(pos)); 113 if (IS_ERR(page)) 114 return PTR_ERR(page); 115 116 map->m_la = chunknr << vi->chunkbits; 117 map->m_plen = min_t(erofs_off_t, 1UL << vi->chunkbits, 118 roundup(inode->i_size - map->m_la, EROFS_BLKSIZ)); 119 120 /* handle block map */ 121 if (!(vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES)) { 122 __le32 *blkaddr = page_address(page) + erofs_blkoff(pos); 123 124 if (le32_to_cpu(*blkaddr) == EROFS_NULL_ADDR) { 125 map->m_flags = 0; 126 } else { 127 map->m_pa = blknr_to_addr(le32_to_cpu(*blkaddr)); 128 map->m_flags = EROFS_MAP_MAPPED; 129 } 130 goto out_unlock; 131 } 132 /* parse chunk indexes */ 133 idx = page_address(page) + erofs_blkoff(pos); 134 switch (le32_to_cpu(idx->blkaddr)) { 135 case EROFS_NULL_ADDR: 136 map->m_flags = 0; 137 break; 138 default: 140 map->m_pa = blknr_to_addr(le32_to_cpu(idx->blkaddr)); 141 map->m_flags = EROFS_MAP_MAPPED; 142 break; 143 } 144 out_unlock: 145 unlock_page(page); 146 put_page(page); 147 out: 148 map->m_llen = map->m_plen; 149 return err; 150 } 151 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org