tree: https://github.com/ammarfaizi2/linux-block dhowells/linux-fs/netfs-maple head: 5cb7f190822d09757b30cd9539e57eef72552d1f commit: eefdd180445e96088f4a69f0e733643e9a794b1f [31/42] netfs: Allow buffered shared-writeable mmap through netfs_page_mkwrite() config: hexagon-randconfig-r005-20220216 (https://download.01.org/0day-ci/archive/20220217/202202170739.jOmFwlAm-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0e628a783b935c70c80815db6c061ec84f884af5) 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/ammarfaizi2/linux-block/commit/eefdd180445e96088f4a69f... git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block dhowells/linux-fs/netfs-maple git checkout eefdd180445e96088f4a69f0e733643e9a794b1f # 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=hexagon 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; All warnings (new ones prefixed by >>): fs/netfs/buffered_write.c:28:26: warning: comparison of distinct pointer types ('typeof ((1UL << 14) - offset) *' (aka 'unsigned long *') and 'typeof (size) *' (aka 'unsigned int *')) [-Wcompare-distinct-pointer-types] unsigned int psize = min(PAGE_SIZE - offset, size); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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))) ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~ fs/netfs/buffered_write.c:95:18: warning: comparison of distinct pointer types ('typeof (target->from) *' (aka 'unsigned long long *') and 'typeof (folio_pos(folio) + offset) *' (aka 'long long *')) [-Wcompare-distinct-pointer-types] target->from = min(target->from, folio_pos(folio) + offset); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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))) ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~ fs/netfs/buffered_write.c:96:18: warning: comparison of distinct pointer types ('typeof (target->to) *' (aka 'unsigned long long *') and 'typeof (folio_pos(folio) + offset + len) *' (aka 'long long *')) [-Wcompare-distinct-pointer-types] target->to = max(target->to, folio_pos(folio) + offset + len); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:52:19: note: expanded from macro 'max' #define max(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))) ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~ if (mas_expected_entries(&mas, 2) < 0) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/netfs/buffered_write.c:785:30: note: uninitialized use occurs here netfs_put_dirty_region(ctx, spare_region, netfs_region_trace_put_discard); ^~~~~~~~~~~~ fs/netfs/buffered_write.c:749:2: note: remove the 'if' if its condition is always false if (mas_expected_entries(&mas, 2) < 0) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/netfs/buffered_write.c:746:6: warning: variable 'spare_region' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] if (folio_lock_killable(folio) < 0) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/netfs/buffered_write.c:785:30: note: uninitialized use occurs here netfs_put_dirty_region(ctx, spare_region, netfs_region_trace_put_discard); ^~~~~~~~~~~~ fs/netfs/buffered_write.c:746:2: note: remove the 'if' if its condition is always false if (folio_lock_killable(folio) < 0) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/netfs/buffered_write.c:743:6: warning: variable 'spare_region' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] if (folio_wait_writeback_killable(folio)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/netfs/buffered_write.c:785:30: note: uninitialized use occurs here netfs_put_dirty_region(ctx, spare_region, netfs_region_trace_put_discard); ^~~~~~~~~~~~ fs/netfs/buffered_write.c:743:2: note: remove the 'if' if its condition is always false if (folio_wait_writeback_killable(folio)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/netfs/buffered_write.c:726:41: note: initialize the variable 'spare_region' to silence this warning struct netfs_dirty_region *spare_region; ^ = NULL 6 warnings generated. vim +749 fs/netfs/buffered_write.c 719 720 /* 721 * Notification that a previously read-only page is about to become writable. 722 * Note that the caller indicates a single page of a multipage folio. 723 */ 724 vm_fault_t netfs_page_mkwrite(struct vm_fault *vmf) 725 { 726 struct netfs_dirty_region *spare_region; 727 struct folio *folio = page_folio(vmf->page); 728 struct file *file = vmf->vma->vm_file; 729 struct inode *inode = file_inode(file); 730 struct netfs_i_context *ctx = netfs_i_context(inode); 731 vm_fault_t ret = VM_FAULT_RETRY; 732 int err; 733 734 MA_STATE(mas, &ctx->dirty_regions, vmf->page->index, PAGE_SIZE); 735 736 _enter("%lx", folio->index); 737 738 if (ctx->ops->validate_for_write(inode, file) < 0) 739 return VM_FAULT_SIGBUS; 740 741 sb_start_pagefault(inode->i_sb); 742 743 if (folio_wait_writeback_killable(folio)) 744 goto out; 745 746 if (folio_lock_killable(folio) < 0) 747 goto out; 748 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org