Hi "Matthew, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.14-rc2 next-20210720] [cannot apply to xfs-linux/for-next block/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/Matthew-Wilcox-Oracle/Folio-supp... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2734d6c1b1a089fb593ef6a23d4b70903526fe0c config: x86_64-randconfig-r016-20210720 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 87039c048c0cbc3d8cbba86187269b006bf2f373) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/d611eec3f37483e1acbcc299bf47e9297... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Matthew-Wilcox-Oracle/Folio-support-in-block-iomap-layers/20210720-152323 git checkout d611eec3f37483e1acbcc299bf47e929766afc8d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): In file included from arch/x86/kernel/asm-offsets.c:13: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:22: In file included from include/linux/writeback.h:14: In file included from include/linux/blk-cgroup.h:23: In file included from include/linux/blkdev.h:18: include/linux/bio.h:338:14: error: implicit declaration of function 'page_folio' [-Werror,-Wimplicit-function-declaration] fi->folio = page_folio(bvec->bv_page); ^ fi->folio = page_folio(bvec->bv_page); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/bio.h:340:43: error: incomplete definition of type 'struct folio' PAGE_SIZE * (bvec->bv_page - &fi->folio->page); ~~~~~~~~~^ include/linux/bio.h:325:9: note: forward declaration of 'struct folio' struct folio *folio; ^ include/linux/bio.h:342:19: error: implicit declaration of function 'folio_size' [-Werror,-Wimplicit-function-declaration] fi->length = min(folio_size(fi->folio) - fi->offset, fi->_seg_count); ^ include/linux/bio.h:350:15: error: implicit declaration of function 'folio_next' [-Werror,-Wimplicit-function-declaration] fi->folio = folio_next(fi->folio); ^ include/linux/bio.h:350:13: warning: incompatible integer to pointer conversion assigning to 'struct folio *' from 'int' [-Wint-conversion] fi->folio = folio_next(fi->folio); ^ ~~~~~~~~~~~~~~~~~~~~~ include/linux/bio.h:352:20: error: implicit declaration of function 'folio_size' [-Werror,-Wimplicit-function-declaration] fi->length = min(folio_size(fi->folio), fi->_seg_count); ^ fi->length = min(folio_size(fi->folio), fi->_seg_count); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:45:19: note: expanded from macro 'min' #define min(x, y) __careful_cmp(x, y, <) ^~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp' __builtin_choose_expr(__safe_cmp(x, y), \ ^~~~~~~~~~~~~~~~ include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp' (__typecheck(x, y) && __no_side_effects(x, y)) ^~~~~~~~~~~~~~~~~ include/linux/minmax.h:20:28: note: expanded from macro '__typecheck' (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1))) ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~ 3 warnings and 5 errors generated. -- In file included from arch/x86/kernel/asm-offsets.c:13: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:22: In file included from include/linux/writeback.h:14: In file included from include/linux/blk-cgroup.h:23: In file included from include/linux/blkdev.h:18: include/linux/bio.h:338:14: error: implicit declaration of function 'page_folio' [-Werror,-Wimplicit-function-declaration] fi->folio = page_folio(bvec->bv_page); ^ fi->folio = page_folio(bvec->bv_page); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/bio.h:340:43: error: incomplete definition of type 'struct folio' PAGE_SIZE * (bvec->bv_page - &fi->folio->page); ~~~~~~~~~^ include/linux/bio.h:325:9: note: forward declaration of 'struct folio' struct folio *folio; ^ include/linux/bio.h:342:19: error: implicit declaration of function 'folio_size' [-Werror,-Wimplicit-function-declaration] fi->length = min(folio_size(fi->folio) - fi->offset, fi->_seg_count); ^ include/linux/bio.h:350:15: error: implicit declaration of function 'folio_next' [-Werror,-Wimplicit-function-declaration] fi->folio = folio_next(fi->folio); ^ include/linux/bio.h:350:13: warning: incompatible integer to pointer conversion assigning to 'struct folio *' from 'int' [-Wint-conversion] fi->folio = folio_next(fi->folio); ^ ~~~~~~~~~~~~~~~~~~~~~ include/linux/bio.h:352:20: error: implicit declaration of function 'folio_size' [-Werror,-Wimplicit-function-declaration] fi->length = min(folio_size(fi->folio), fi->_seg_count); ^ fi->length = min(folio_size(fi->folio), fi->_seg_count); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:45:19: note: expanded from macro 'min' #define min(x, y) __careful_cmp(x, y, <) ^~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp' __builtin_choose_expr(__safe_cmp(x, y), \ ^~~~~~~~~~~~~~~~ include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp' (__typecheck(x, y) && __no_side_effects(x, y)) ^~~~~~~~~~~~~~~~~ include/linux/minmax.h:20:28: note: expanded from macro '__typecheck' (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1))) ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~ 3 warnings and 5 errors generated. make[2]: *** [scripts/Makefile.build:117: arch/x86/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1213: prepare0] Error 2 make[1]: Target 'modules_prepare' not remade because of errors. make: *** [Makefile:220: __sub-make] Error 2 make: Target 'modules_prepare' not remade because of errors. -- In file included from arch/x86/kernel/asm-offsets.c:13: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:22: In file included from include/linux/writeback.h:14: In file included from include/linux/blk-cgroup.h:23: In file included from include/linux/blkdev.h:18: include/linux/bio.h:338:14: error: implicit declaration of function 'page_folio' [-Werror,-Wimplicit-function-declaration] fi->folio = page_folio(bvec->bv_page); ^ fi->folio = page_folio(bvec->bv_page); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/bio.h:340:43: error: incomplete definition of type 'struct folio' PAGE_SIZE * (bvec->bv_page - &fi->folio->page); ~~~~~~~~~^ include/linux/bio.h:325:9: note: forward declaration of 'struct folio' struct folio *folio; ^ include/linux/bio.h:342:19: error: implicit declaration of function 'folio_size' [-Werror,-Wimplicit-function-declaration] fi->length = min(folio_size(fi->folio) - fi->offset, fi->_seg_count); ^ include/linux/bio.h:350:15: error: implicit declaration of function 'folio_next' [-Werror,-Wimplicit-function-declaration] fi->folio = folio_next(fi->folio); ^ include/linux/bio.h:350:13: warning: incompatible integer to pointer conversion assigning to 'struct folio *' from 'int' [-Wint-conversion] fi->folio = folio_next(fi->folio); ^ ~~~~~~~~~~~~~~~~~~~~~ include/linux/bio.h:352:20: error: implicit declaration of function 'folio_size' [-Werror,-Wimplicit-function-declaration] fi->length = min(folio_size(fi->folio), fi->_seg_count); ^ fi->length = min(folio_size(fi->folio), fi->_seg_count); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:45:19: note: expanded from macro 'min' #define min(x, y) __careful_cmp(x, y, <) ^~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp' __builtin_choose_expr(__safe_cmp(x, y), \ ^~~~~~~~~~~~~~~~ include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp' (__typecheck(x, y) && __no_side_effects(x, y)) ^~~~~~~~~~~~~~~~~ include/linux/minmax.h:20:28: note: expanded from macro '__typecheck' (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1))) ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~ 3 warnings and 5 errors generated. make[2]: *** [scripts/Makefile.build:117: arch/x86/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1213: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:220: __sub-make] Error 2 make: Target 'prepare' not remade because of errors. vim +338 include/linux/bio.h 332 333 static inline 334 void bio_first_folio(struct folio_iter *fi, struct bio *bio, int i) 335 { 336 struct bio_vec *bvec = bio_first_bvec_all(bio) + i; 337 339 fi->offset = bvec->bv_offset + 340 PAGE_SIZE * (bvec->bv_page - &fi->folio->page); 341 fi->_seg_count = bvec->bv_len; 342 fi->length = min(folio_size(fi->folio) - fi->offset, fi->_seg_count); 343 fi->_i = i; 344 } 345 346 static inline void bio_next_folio(struct folio_iter *fi, struct bio *bio) 347 { 348 fi->_seg_count -= fi->length; 349 if (fi->_seg_count) { 350 fi->folio = folio_next(fi->folio); 351 fi->offset = 0; 353 } else if (fi->_i + 1 < bio->bi_vcnt) { 354 bio_first_folio(fi, bio, fi->_i + 1); 355 } else { 356 fi->folio = NULL; 357 } 358 } 359 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org