tree: https://github.com/ammarfaizi2/linux-block dhowells/linux-fs/netfs-maple head: 429e2bb6fb190f390ed23afc0d2308e877c43be5 commit: 01abe2ebb0b5676c9d0394947cfeea45d0f5c09f [29/35] netfs: Implement buffered writes through netfs_file_write_iter() config: xtensa-randconfig-s031-20220211 (https://download.01.org/0day-ci/archive/20220211/202202111406.PpKHKjMT-lk...) compiler: xtensa-linux-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # https://github.com/ammarfaizi2/linux-block/commit/01abe2ebb0b5676c9d03949... git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block dhowells/linux-fs/netfs-maple git checkout 01abe2ebb0b5676c9d0394947cfeea45d0f5c09f # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=xtensa 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; sparse warnings: (new ones prefixed by >>) fs/netfs/write_helper.c: note: in included file (through arch/xtensa/include/asm/bitops.h, include/linux/bitops.h, include/linux/log2.h, ...): arch/xtensa/include/asm/processor.h:107:2: sparse: sparse: Unsupported xtensa ABI arch/xtensa/include/asm/processor.h:137:2: sparse: sparse: Unsupported Xtensa ABI fs/netfs/write_helper.c:127:25: sparse: sparse: incompatible types in comparison expression (different signedness): fs/netfs/write_helper.c:127:25: sparse: unsigned long long * fs/netfs/write_helper.c:127:25: sparse: long long * vim +28 fs/netfs/write_helper.c 18 19 static size_t copy_folio_from_iter_atomic(struct folio *folio, 20 unsigned int offset, size_t size, 21 struct iov_iter *i) 22 { 23 size_t copied = 0, n; 24 25 do { 26 unsigned int index = offset / PAGE_SIZE; 27 unsigned int poffset = offset % PAGE_SIZE; 29 30 n = copy_page_from_iter_atomic(folio_file_page(folio, index), 31 poffset, psize, i); 32 copied += n; 33 if (n < psize) 34 break; 35 size -= n; 36 } while (size); 37 return copied; 38 } 39 40 /* 41 * Initialise a new dirty folio group. We have to round it out to any crypto 42 * alignment. 43 */ 44 static void netfs_init_dirty_region(struct netfs_i_context *ctx, 45 struct netfs_dirty_region *region, 46 struct file *file, 47 enum netfs_write_type write_type, 48 loff_t start, size_t len) 49 { 50 struct netfs_flush_group *group; 51 52 region->from = start; 53 region->to = start + len; 54 region->debug_id = atomic_inc_return(&netfs_region_debug_ids); 55 refcount_set(&region->ref, 1); 56 57 switch (write_type) { 58 case NETFS_ORDINARY_WRITE: 59 case NETFS_DIO_WRITE: 60 break; 61 case NETFS_SYNC_WRITE: 62 __set_bit(NETFS_REGION_SYNC, &region->flags); 63 break; 64 case NETFS_DSYNC_WRITE: 65 __set_bit(NETFS_REGION_DSYNC, &region->flags); 66 break; 67 } 68 69 if (file && ctx->ops->init_dirty_region) 70 ctx->ops->init_dirty_region(region, file); 71 72 if (!region->group) { 73 group = list_last_entry(&ctx->flush_groups, 74 struct netfs_flush_group, group_link); 75 region->group = netfs_get_flush_group(group); 76 } 77 trace_netfs_ref_region(region->debug_id, refcount_read(&region->ref), 78 netfs_region_trace_new); 79 } 80 81 /* 82 * Decide if/how a write can be merged with a dirty region. 83 */ 84 static bool netfs_is_write_compatible(struct netfs_i_context *ctx, 85 struct netfs_dirty_region *old, 86 struct netfs_dirty_region *candidate) 87 { 88 /* Regions being actively flushed can't be merged with */ 89 if (netfs_mas_is_flushing(old) || 90 candidate->group != old->group || 91 test_bit(NETFS_FGROUP_FLUSHED, &old->group->flags)) { 92 _leave(" = f [flush]"); 93 return false; 94 } 95 96 if (test_bit(NETFS_REGION_DSYNC, &old->flags)) { 97 _leave(" = f [dsync]"); 98 return false; 99 } 100 101 if (!ctx->ops->is_write_compatible) { 102 if (test_bit(NETFS_REGION_DSYNC, &candidate->flags)) { 103 _leave(" = f [dsync]"); 104 return false; 105 } 106 _leave(" = t"); 107 return true; 108 } 109 return ctx->ops->is_write_compatible(ctx, old, candidate); 110 } 111 112 /* 113 * Subsume the modifications into an existing target region. Returns true if 114 * we need to update the dirty_regions tree. 115 */ 116 static bool netfs_subsume_into_existing(struct netfs_i_context *ctx, 117 struct folio *folio, 118 struct ma_state *mas, 119 struct netfs_dirty_region **_target, 120 struct netfs_dirty_region **_to_put, 121 pgoff_t *_first, pgoff_t *_last, 122 size_t offset, size_t len) 123 { 124 struct netfs_dirty_region *target = *_target, *prev; 125 127 target->to = max(target->to, folio_pos(folio) + offset + len); 128 trace_netfs_dirty(ctx, target, NULL, *_first, *_last, 129 netfs_dirty_trace_modified); 130 131 /* We might have bridged to the previous region also. */ 132 prev = mas_prev(mas, *_first - 1); 133 if (!netfs_mas_is_valid(prev)) 134 return false; 135 136 if (prev->to != target->from || 137 prev->waiting_on_wb != target->waiting_on_wb) 138 return false; 139 140 *_first = mas->index; 141 prev->to = target->to; 142 *_to_put = target; 143 trace_netfs_dirty(ctx, prev, NULL, *_first, *_last, 144 netfs_dirty_trace_merged_prev); 145 return true; 146 } 147 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org