tree: https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git master head: 34dd03a2fe9af1f1a9dbd7ec65eb1f247bdfe0db commit: cfc5b41b296c2d61dc124a99904f85d16008bf57 [44/69] mm: thp: make the THP mapcount atomic against __split_huge_pmd_locked() config: sparc-defconfig (attached as .config) compiler: sparc-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git/commit/?id=... git remote add aa https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git git fetch --no-tags aa master git checkout cfc5b41b296c2d61dc124a99904f85d16008bf57 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): mm/swapfile.c: In function 'page_trans_huge_map_swapcount': 1649 | seqcount = page_mapcount_seq_begin(page); | ^~~~~~~~~~~~~~~~~~~~~~~ | page_mapcount_reset 1680 | if (page_mapcount_seq_retry(page, seqcount)) | ^~~~~~~~~~~~~~~~~~~~~~~ | page_mapcount_reset cc1: some warnings being treated as errors vim +1649 mm/swapfile.c 1622 1623 static int page_trans_huge_map_swapcount(struct page *page, int *total_mapcount, 1624 int *total_swapcount) 1625 { 1626 int i, map_swapcount, _total_mapcount, _total_swapcount; 1627 unsigned long offset = 0; 1628 struct swap_info_struct *si; 1629 struct swap_cluster_info *ci = NULL; 1630 unsigned char *map = NULL; 1631 int mapcount, swapcount = 0; 1632 unsigned long seqcount; 1633 1634 /* hugetlbfs shouldn't call it */ 1635 VM_BUG_ON_PAGE(PageHuge(page), page); 1636 1637 if (!IS_ENABLED(CONFIG_THP_SWAP) || likely(!PageTransCompound(page))) { 1638 mapcount = page_trans_huge_mapcount(page, total_mapcount); 1639 if (PageSwapCache(page)) 1640 swapcount = page_swapcount(page); 1641 if (total_swapcount) 1642 *total_swapcount = swapcount; 1643 return mapcount + swapcount; 1644 } 1645 1646 page = compound_head(page); 1647 1648 again: 1650 1651 _total_mapcount = _total_swapcount = map_swapcount = 0; 1652 if (PageSwapCache(page)) { 1653 swp_entry_t entry; 1654 1655 entry.val = page_private(page); 1656 si = _swap_info_get(entry); 1657 if (si) { 1658 map = si->swap_map; 1659 offset = swp_offset(entry); 1660 } 1661 } 1662 if (map) 1663 ci = lock_cluster(si, offset); 1664 for (i = 0; i < HPAGE_PMD_NR; i++) { 1665 mapcount = atomic_read(&page[i]._mapcount) + 1; 1666 _total_mapcount += mapcount; 1667 if (map) { 1668 swapcount = swap_count(map[offset + i]); 1669 _total_swapcount += swapcount; 1670 } 1671 map_swapcount = max(map_swapcount, mapcount + swapcount); 1672 } 1673 unlock_cluster(ci); 1674 if (PageDoubleMap(page)) { 1675 map_swapcount -= 1; 1676 _total_mapcount -= HPAGE_PMD_NR; 1677 } 1678 mapcount = compound_mapcount(page); 1679 1681 goto again; 1682 1683 map_swapcount += mapcount; 1684 _total_mapcount += mapcount; 1685 if (total_mapcount) 1686 *total_mapcount = _total_mapcount; 1687 if (total_swapcount) 1688 *total_swapcount = _total_swapcount; 1689 1690 return map_swapcount; 1691 } 1692 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org