tree: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git netfs-folio-regions head: 215a4ee495a95cc73256ed76f91cb78bcabd6b8e commit: 0c1c1796fd33fded73a9a4305a9e43e8922746ee [18/28] netfs: Do encryption in write preparatory phase config: nios2-randconfig-s031-20210818 (attached as .config) compiler: nios2-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: v0.6.3-348-gf0e6938b-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/com... git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git git fetch --no-tags dhowells-fs netfs-folio-regions git checkout 0c1c1796fd33fded73a9a4305a9e43e8922746ee # 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=nios2 SHELL=/bin/bash fs/netfs/ 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 +78 fs/netfs/write_prep.c 46 47 /* 48 * Populate a scatterlist from folios in an xarray. 49 */ 50 static int netfs_xarray_to_sglist(struct xarray *xa, loff_t pos, size_t len, 51 struct scatterlist *sg, unsigned int n_sg) 52 { 53 struct scatterlist *p = sg; 54 struct folio *folio = NULL; 55 size_t seg, offset, skip = 0; 56 loff_t start = pos; 57 pgoff_t index = start >> PAGE_SHIFT; 58 int j; 59 60 XA_STATE(xas, xa, index); 61 62 sg_init_table(sg, n_sg); 63 64 rcu_read_lock(); 65 66 xas_for_each(&xas, folio, ULONG_MAX) { 67 kdebug("LOAD %lx %px", folio->index, folio); 68 if (xas_retry(&xas, folio)) 69 continue; 70 if (WARN_ON(xa_is_value(folio)) || WARN_ON(folio_test_hugetlb(folio))) 71 break; 72 for (j = (folio_index(folio) < index) ? index - folio_index(folio) : 0; 73 j < folio_nr_pages(folio); j++ 74 ) { 75 struct page *subpage = folio_file_page(folio, j); 76 77 offset = (pos + skip) & ~PAGE_MASK; 79 80 kdebug("[%zx] %lx %zx @%zx", p - sg, subpage->index, seg, offset); 81 sg_set_page(p++, subpage, seg, offset); 82 83 len -= seg; 84 skip += seg; 85 if (len == 0) 86 break; 87 } 88 if (len == 0) 89 break; 90 } 91 92 rcu_read_unlock(); 93 if (len > 0) { 94 WARN_ON(len > 0); 95 return -EIO; 96 } 97 98 sg_mark_end(p - 1); 99 kleave(" = %zd", p - sg); 100 return p - sg; 101 } 102 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org