tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: cd557f1c605fc5a2c0eb0b540610f50dc67dd849 commit: 69cc52577e67f437b4faaa2024faa279fabd2904 [3032/3150] mm: thp: check total_mapcount instead of page_mapcount config: i386-randconfig-r006-20210517 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 69cc52577e67f437b4faaa2024faa279fabd2904 # save the attached .config to linux build tree make W=1 W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): mm/huge_memory.c: In function 'unmap_page': 2345 | bool unmap_success; | ^~~~~~~~~~~~~ mm/huge_memory.c: In function 'split_huge_page_to_list': 2663 | int count, mapcount, extra_pins, ret; | ^~~~~ vim +/unmap_success +2345 mm/huge_memory.c e9b61f19858a5d Kirill A. Shutemov 2016-01-15 2340 906f9cdfc2a080 Hugh Dickins 2018-11-30 2341 static void unmap_page(struct page *page) e9b61f19858a5d Kirill A. Shutemov 2016-01-15 2342 { 013339df116c2e Shakeel Butt 2020-12-14 2343 enum ttu_flags ttu_flags = TTU_IGNORE_MLOCK | c7ab0d2fdc8402 Kirill A. Shutemov 2017-02-24 2344 TTU_RMAP_LOCKED | TTU_SPLIT_HUGE_PMD; 666e5a406c3ed5 Minchan Kim 2017-05-03 @2345 bool unmap_success; e9b61f19858a5d Kirill A. Shutemov 2016-01-15 2346 e9b61f19858a5d Kirill A. Shutemov 2016-01-15 2347 VM_BUG_ON_PAGE(!PageHead(page), page); e9b61f19858a5d Kirill A. Shutemov 2016-01-15 2348 baa355fd331424 Kirill A. Shutemov 2016-07-26 2349 if (PageAnon(page)) b5ff8161e37cef Naoya Horiguchi 2017-09-08 2350 ttu_flags |= TTU_SPLIT_FREEZE; baa355fd331424 Kirill A. Shutemov 2016-07-26 2351 666e5a406c3ed5 Minchan Kim 2017-05-03 2352 unmap_success = try_to_unmap(page, ttu_flags); e9b61f19858a5d Kirill A. Shutemov 2016-01-15 2353 } e9b61f19858a5d Kirill A. Shutemov 2016-01-15 2354 :::::: The code at line 2345 was first introduced by commit :::::: 666e5a406c3ed562e7b3ceff8b631b6067bdaead mm: make ttu's return boolean :::::: TO: Minchan Kim <minchan(a)kernel.org&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org