Hi NeilBrown, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.17-rc1 next-20220124] [cannot apply to trondmy-nfs/linux-next cifs/for-next] [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/NeilBrown/Repair-SWAP-over_NFS/2... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git dd81e1c7d5fb126e5fbc5c9e334d7b3ec29a16a0 config: i386-randconfig-a011-20220124 (https://download.01.org/0day-ci/archive/20220124/202201241747.X9gXaaeP-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 9006bf424847bf91f0a624ffc27ad165c7b804c4) 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://github.com/0day-ci/linux/commit/63bff668aa0537d7ccef9ed428809fc16... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review NeilBrown/Repair-SWAP-over_NFS/20220124-115716 git checkout 63bff668aa0537d7ccef9ed428809fc16c1a6b6c # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash 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 >>): In file included from mm/vmscan.c:61: mm/swap.h:66:12: warning: declaration of 'struct swap_iocb' will not be visible outside of this function [-Wvisibility] struct swap_iocb **plug); ^ { ^ 1 warning and 1 error generated. -- In file included from mm/shmem.c:41: mm/swap.h:66:12: warning: declaration of 'struct swap_iocb' will not be visible outside of this function [-Wvisibility] struct swap_iocb **plug); ^ { ^ In file included from mm/shmem.c:56: include/linux/mman.h:158:9: warning: division by zero is undefined [-Wdivision-by-zero] _calc_vm_trans(flags, MAP_SYNC, VM_SYNC ) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/mman.h:136:21: note: expanded from macro '_calc_vm_trans' : ((x) & (bit1)) / ((bit1) / (bit2)))) ^ ~~~~~~~~~~~~~~~~~ 2 warnings and 1 error generated. -- In file included from mm/page_alloc.c:84: mm/swap.h:66:12: warning: declaration of 'struct swap_iocb' will not be visible outside of this function [-Wvisibility] struct swap_iocb **plug); ^ { ^ mm/page_alloc.c:3821:15: warning: no previous prototype for function 'should_fail_alloc_page' [-Wmissing-prototypes] noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) ^ mm/page_alloc.c:3821:10: note: declare 'static' if the function is not intended to be used outside of this translation unit noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) ^ static 2 warnings and 1 error generated. vim +67 mm/swap.h 50dceef273a619 NeilBrown 2022-01-24 45 50dceef273a619 NeilBrown 2022-01-24 46 struct page *read_swap_cache_async(swp_entry_t, gfp_t, 50dceef273a619 NeilBrown 2022-01-24 47 struct vm_area_struct *vma, 50dceef273a619 NeilBrown 2022-01-24 48 unsigned long addr, 63bff668aa0537 NeilBrown 2022-01-24 49 bool do_poll, 63bff668aa0537 NeilBrown 2022-01-24 50 struct swap_iocb **plug); 50dceef273a619 NeilBrown 2022-01-24 51 struct page *__read_swap_cache_async(swp_entry_t, gfp_t, 50dceef273a619 NeilBrown 2022-01-24 52 struct vm_area_struct *vma, 50dceef273a619 NeilBrown 2022-01-24 53 unsigned long addr, 50dceef273a619 NeilBrown 2022-01-24 54 bool *new_page_allocated); 50dceef273a619 NeilBrown 2022-01-24 55 struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t flag, 50dceef273a619 NeilBrown 2022-01-24 56 struct vm_fault *vmf); 50dceef273a619 NeilBrown 2022-01-24 57 struct page *swapin_readahead(swp_entry_t entry, gfp_t flag, 50dceef273a619 NeilBrown 2022-01-24 58 struct vm_fault *vmf); 50dceef273a619 NeilBrown 2022-01-24 59 12cf545fe71035 NeilBrown 2022-01-24 60 static inline unsigned int page_swap_flags(struct page *page) 12cf545fe71035 NeilBrown 2022-01-24 61 { 12cf545fe71035 NeilBrown 2022-01-24 62 return page_swap_info(page)->flags; 12cf545fe71035 NeilBrown 2022-01-24 63 } 50dceef273a619 NeilBrown 2022-01-24 64 #else /* CONFIG_SWAP */ 63bff668aa0537 NeilBrown 2022-01-24 65 static inline int swap_readpage(struct page *page, bool do_poll, 63bff668aa0537 NeilBrown 2022-01-24 @66 struct swap_iocb **plug); 50dceef273a619 NeilBrown 2022-01-24 @67 { 50dceef273a619 NeilBrown 2022-01-24 68 return 0; 50dceef273a619 NeilBrown 2022-01-24 69 } 50dceef273a619 NeilBrown 2022-01-24 70 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org