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d="scan'208";a="3982497" Received: from lkp-server01.sh.intel.com (HELO 0caa9d2d175c) ([10.239.97.150]) by orviesa002.jf.intel.com with ESMTP; 25 Oct 2026 00:54:42 -0700 Received: from kbuild by 0caa9d2d175c with local (Exim 4.98.2) (envelope-from ) id 1xKt3v-00000000Ues-266g; Sun, 25 Oct 2026 07:54:39 +0000 Date: Sun, 25 Oct 2026 15:54:28 +0800 From: kernel test robot To: Zach Brown Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev Subject: [zab-rpdfs:rpdfs-initial 85/98] fs/rpdfs/meta.c:184:6: warning: variable 'folio' is used uninitialized whenever 'if' condition is true Message-ID: <202610251501.pwJfD1H3-lkp@intel.com> User-Agent: s-nail v14.9.25 X-Mailing-List: llvm@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list Hi Zach, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/zab/linux-rpdfs.git rpdfs-initial head: 8a293e5c1bf0416f4d4e116bf8693c00dbe876da commit: 2f7d4b4295890ece08df31aa8e2d0150594c6c07 [85/98] rpdfs: update inode code config: hexagon-randconfig-1000-20261025 (https://download.01.org/0day-ci/archive/20261025/202610251501.pwJfD1H3-lkp@intel.com/config) compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261025/202610251501.pwJfD1H3-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202610251501.pwJfD1H3-lkp@intel.com/ All warnings (new ones prefixed by >>): >> fs/rpdfs/meta.c:184:6: warning: variable 'folio' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] 184 | if (WARN_ON_ONCE(mgf == 0 || (mgf & MGF__INVALID)) || | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 185 | WARN_ON_ONCE((mgf & MGF_NEW) && (mgf & ~MGF_NEW)) || | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 186 | WARN_ON_ONCE((mgf & MGF_READ) && (mgf & MGF_WRITE))) { | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/asm-generic/bug.h:184:33: note: expanded from macro 'WARN_ON_ONCE' 184 | #define WARN_ON_ONCE(condition) WARN_ON(condition) | ^ include/asm-generic/bug.h:170:28: note: expanded from macro 'WARN_ON' 170 | #define WARN_ON(condition) ({ \ | ^ fs/rpdfs/meta.c:226:9: note: uninitialized use occurs here 226 | return folio; | ^~~~~ fs/rpdfs/meta.c:184:2: note: remove the 'if' if its condition is always false 184 | if (WARN_ON_ONCE(mgf == 0 || (mgf & MGF__INVALID)) || | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 185 | WARN_ON_ONCE((mgf & MGF_NEW) && (mgf & ~MGF_NEW)) || | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 186 | WARN_ON_ONCE((mgf & MGF_READ) && (mgf & MGF_WRITE))) { | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 187 | ret = -EINVAL; | ~~~~~~~~~~~~~~ 188 | goto out; | ~~~~~~~~~ 189 | } | ~ >> fs/rpdfs/meta.c:184:6: warning: variable 'folio' is used uninitialized whenever '||' condition is true [-Wsometimes-uninitialized] 184 | if (WARN_ON_ONCE(mgf == 0 || (mgf & MGF__INVALID)) || | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 185 | WARN_ON_ONCE((mgf & MGF_NEW) && (mgf & ~MGF_NEW)) || | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/asm-generic/bug.h:184:33: note: expanded from macro 'WARN_ON_ONCE' 184 | #define WARN_ON_ONCE(condition) WARN_ON(condition) | ^ include/asm-generic/bug.h:170:28: note: expanded from macro 'WARN_ON' 170 | #define WARN_ON(condition) ({ \ | ^ fs/rpdfs/meta.c:226:9: note: uninitialized use occurs here 226 | return folio; | ^~~~~ fs/rpdfs/meta.c:184:6: note: remove the '||' if its condition is always false 184 | if (WARN_ON_ONCE(mgf == 0 || (mgf & MGF__INVALID)) || | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 185 | WARN_ON_ONCE((mgf & MGF_NEW) && (mgf & ~MGF_NEW)) || | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/asm-generic/bug.h:184:33: note: expanded from macro 'WARN_ON_ONCE' 184 | #define WARN_ON_ONCE(condition) WARN_ON(condition) | ^ include/asm-generic/bug.h:170:28: note: expanded from macro 'WARN_ON' 170 | #define WARN_ON(condition) ({ \ | ^ >> fs/rpdfs/meta.c:184:6: warning: variable 'folio' is used uninitialized whenever '||' condition is true [-Wsometimes-uninitialized] 184 | if (WARN_ON_ONCE(mgf == 0 || (mgf & MGF__INVALID)) || | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/asm-generic/bug.h:184:33: note: expanded from macro 'WARN_ON_ONCE' 184 | #define WARN_ON_ONCE(condition) WARN_ON(condition) | ^~~~~~~~~~~~~~~~~~ include/asm-generic/bug.h:170:28: note: expanded from macro 'WARN_ON' 170 | #define WARN_ON(condition) ({ \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 171 | int __ret_warn_on = !!(condition); \ | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 172 | unlikely(__ret_warn_on); \ | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 173 | }) | ~~ fs/rpdfs/meta.c:226:9: note: uninitialized use occurs here 226 | return folio; | ^~~~~ fs/rpdfs/meta.c:184:6: note: remove the '||' if its condition is always false 184 | if (WARN_ON_ONCE(mgf == 0 || (mgf & MGF__INVALID)) || | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/asm-generic/bug.h:184:33: note: expanded from macro 'WARN_ON_ONCE' 184 | #define WARN_ON_ONCE(condition) WARN_ON(condition) | ^ include/asm-generic/bug.h:170:28: note: expanded from macro 'WARN_ON' 170 | #define WARN_ON(condition) ({ \ | ^ fs/rpdfs/meta.c:178:21: note: initialize the variable 'folio' to silence this warning 178 | struct folio *folio; | ^ | = NULL 3 warnings generated. -- >> fs/rpdfs/mkfs.c:23:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] 23 | if (IS_ERR(folio)) { | ^~~~~~~~~~~~~ fs/rpdfs/mkfs.c:46:9: note: uninitialized use occurs here 46 | return ret; | ^~~ fs/rpdfs/mkfs.c:23:2: note: remove the 'if' if its condition is always true 23 | if (IS_ERR(folio)) { | ^~~~~~~~~~~~~~~~~~ fs/rpdfs/mkfs.c:20:9: note: initialize the variable 'ret' to silence this warning 20 | int ret; | ^ | = 0 1 warning generated. -- >> fs/rpdfs/ehtable.c:259:2: warning: variable 'del' is used uninitialized whenever 'for' loop exits because its condition is false [-Wsometimes-uninitialized] 259 | for_each_entry(ehb, iargs->hash, ent, pl) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/rpdfs/ehtable.c:148:2: note: expanded from macro 'for_each_entry' 148 | __for_each_entry(ehb, base_entry(ehb, hash), ent, pl) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/rpdfs/ehtable.c:144:7: note: expanded from macro '__for_each_entry' 144 | (ent = &ehb->entries[(ent - ehb->entries) & RPDFS_EHTABLE_ENTRIES_MASK]); \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/rpdfs/ehtable.c:275:31: note: uninitialized use occurs here 275 | for_each_entry_continue(ehb, del, ent, pl) { | ^~~ fs/rpdfs/ehtable.c:151:25: note: expanded from macro 'for_each_entry_continue' 151 | __for_each_entry(ehb, (cont + 1), ent, pl) | ^~~~ fs/rpdfs/ehtable.c:143:13: note: expanded from macro '__for_each_entry' 143 | for (ent = INIT, pl = 0; \ | ^~~~ fs/rpdfs/ehtable.c:259:2: note: remove the condition if it is always true 259 | for_each_entry(ehb, iargs->hash, ent, pl) { | ^ fs/rpdfs/ehtable.c:148:2: note: expanded from macro 'for_each_entry' 148 | __for_each_entry(ehb, base_entry(ehb, hash), ent, pl) | ^ fs/rpdfs/ehtable.c:144:7: note: expanded from macro '__for_each_entry' 144 | (ent = &ehb->entries[(ent - ehb->entries) & RPDFS_EHTABLE_ENTRIES_MASK]); \ | ^ fs/rpdfs/ehtable.c:254:33: note: initialize the variable 'del' to silence this warning 254 | struct rpdfs_ehtable_entry *del; | ^ | = NULL 1 warning generated. vim +184 fs/rpdfs/meta.c 2658c3c902752b5 Zach Brown 2026-07-09 150 2658c3c902752b5 Zach Brown 2026-07-09 151 /* 2658c3c902752b5 Zach Brown 2026-07-09 152 * Get a folio that contains the block of the described type and index. 2658c3c902752b5 Zach Brown 2026-07-09 153 * Modeled loosely after __filemap_get_folio, except that we have much 2658c3c902752b5 Zach Brown 2026-07-09 154 * less variation in callers. 2658c3c902752b5 Zach Brown 2026-07-09 155 * 2658c3c902752b5 Zach Brown 2026-07-09 156 * Generally folios are returned without the folio lock held. Callers 2658c3c902752b5 Zach Brown 2026-07-09 157 * are expected to have higher level serialization of safe access to the 2658c3c902752b5 Zach Brown 2026-07-09 158 * block's contents. 2658c3c902752b5 Zach Brown 2026-07-09 159 * 2658c3c902752b5 Zach Brown 2026-07-09 160 * The waiting flags (_READ, _WRITE) are killable and only suitable for 2658c3c902752b5 Zach Brown 2026-07-09 161 * task contexts. 2658c3c902752b5 Zach Brown 2026-07-09 162 * 2658c3c902752b5 Zach Brown 2026-07-09 163 * MGF_NEW: return a locked folio that is not uptodate and whose 2658c3c902752b5 Zach Brown 2026-07-09 164 * contents are uninitialized. The caller must unlock, and must either 2658c3c902752b5 Zach Brown 2026-07-09 165 * mark the folio in error or initialize the contents and set it 2658c3c902752b5 Zach Brown 2026-07-09 166 * uptodate. 2658c3c902752b5 Zach Brown 2026-07-09 167 * 2658c3c902752b5 Zach Brown 2026-07-09 168 * MGF_READ: return a folio that is uptodate. The folio may be 2658c3c902752b5 Zach Brown 2026-07-09 169 * undergoing writeback. 2658c3c902752b5 Zach Brown 2026-07-09 170 * 2658c3c902752b5 Zach Brown 2026-07-09 171 * MGF_WRITE: return a locked folio that is uptodate and not under 2658c3c902752b5 Zach Brown 2026-07-09 172 * writeback. The folio is returned locked so that writeback won't 2658c3c902752b5 Zach Brown 2026-07-09 173 * start until the caller unlocks. 2658c3c902752b5 Zach Brown 2026-07-09 174 */ 2658c3c902752b5 Zach Brown 2026-07-09 175 struct folio *rpdfs_meta_get_folio(struct inode *inode, mgf_t mgf, u8 type, u64 t_index) 2658c3c902752b5 Zach Brown 2026-07-09 176 { 2658c3c902752b5 Zach Brown 2026-07-09 177 struct address_space *mapping = shadow_mapping(inode); 2658c3c902752b5 Zach Brown 2026-07-09 178 struct folio *folio; 2658c3c902752b5 Zach Brown 2026-07-09 179 pgoff_t f_index; 2658c3c902752b5 Zach Brown 2026-07-09 180 int ret; 2658c3c902752b5 Zach Brown 2026-07-09 181 2658c3c902752b5 Zach Brown 2026-07-09 182 BUILD_BUG_ON(PAGE_SIZE != RPDFS_BLOCK_SIZE); 2658c3c902752b5 Zach Brown 2026-07-09 183 2658c3c902752b5 Zach Brown 2026-07-09 @184 if (WARN_ON_ONCE(mgf == 0 || (mgf & MGF__INVALID)) || 2658c3c902752b5 Zach Brown 2026-07-09 185 WARN_ON_ONCE((mgf & MGF_NEW) && (mgf & ~MGF_NEW)) || 2658c3c902752b5 Zach Brown 2026-07-09 186 WARN_ON_ONCE((mgf & MGF_READ) && (mgf & MGF_WRITE))) { 2658c3c902752b5 Zach Brown 2026-07-09 187 ret = -EINVAL; 2658c3c902752b5 Zach Brown 2026-07-09 188 goto out; 2658c3c902752b5 Zach Brown 2026-07-09 189 } 2658c3c902752b5 Zach Brown 2026-07-09 190 2658c3c902752b5 Zach Brown 2026-07-09 191 ret = folio_index_from_type(inode, type, t_index, &f_index); 2658c3c902752b5 Zach Brown 2026-07-09 192 if (ret < 0) { 2658c3c902752b5 Zach Brown 2026-07-09 193 folio = ERR_PTR(ret); 2658c3c902752b5 Zach Brown 2026-07-09 194 goto out; 2658c3c902752b5 Zach Brown 2026-07-09 195 } 2658c3c902752b5 Zach Brown 2026-07-09 196 2658c3c902752b5 Zach Brown 2026-07-09 197 if (mgf & MGF_NEW) { 2658c3c902752b5 Zach Brown 2026-07-09 198 folio = __filemap_get_folio(mapping, f_index, FGP_LOCK|FGP_CREAT, GFP_NOFS); 2658c3c902752b5 Zach Brown 2026-07-09 199 goto out; 2658c3c902752b5 Zach Brown 2026-07-09 200 } 2658c3c902752b5 Zach Brown 2026-07-09 201 2658c3c902752b5 Zach Brown 2026-07-09 202 folio = mapping_read_folio_gfp(mapping, f_index, GFP_NOFS); 2658c3c902752b5 Zach Brown 2026-07-09 203 if (IS_ERR(folio)) 2658c3c902752b5 Zach Brown 2026-07-09 204 goto out; 2658c3c902752b5 Zach Brown 2026-07-09 205 2658c3c902752b5 Zach Brown 2026-07-09 206 if (mgf & MGF_WRITE) { 2658c3c902752b5 Zach Brown 2026-07-09 207 ret = folio_lock_killable(folio); 2658c3c902752b5 Zach Brown 2026-07-09 208 if (ret == 0) { 2658c3c902752b5 Zach Brown 2026-07-09 209 ret = folio_wait_writeback_killable(folio); 2658c3c902752b5 Zach Brown 2026-07-09 210 if (ret < 0) 2658c3c902752b5 Zach Brown 2026-07-09 211 folio_unlock(folio); 2658c3c902752b5 Zach Brown 2026-07-09 212 } 2658c3c902752b5 Zach Brown 2026-07-09 213 if (ret < 0) { 2658c3c902752b5 Zach Brown 2026-07-09 214 folio_put(folio); 2658c3c902752b5 Zach Brown 2026-07-09 215 folio = ERR_PTR(ret); 2658c3c902752b5 Zach Brown 2026-07-09 216 goto out; 2658c3c902752b5 Zach Brown 2026-07-09 217 } 2658c3c902752b5 Zach Brown 2026-07-09 218 } 2658c3c902752b5 Zach Brown 2026-07-09 219 2658c3c902752b5 Zach Brown 2026-07-09 220 out: 2658c3c902752b5 Zach Brown 2026-07-09 221 if (!IS_ERR(folio)) 2658c3c902752b5 Zach Brown 2026-07-09 222 rpdfs_prd("mgf %x type %u index %llu "RFF, mgf, type, t_index, RFA(folio)); 2658c3c902752b5 Zach Brown 2026-07-09 223 else 2658c3c902752b5 Zach Brown 2026-07-09 224 rpdfs_prd("mgf %x type %u index %llu ret %ld", mgf, type, t_index, PTR_ERR(folio)); 2658c3c902752b5 Zach Brown 2026-07-09 225 2658c3c902752b5 Zach Brown 2026-07-09 226 return folio; 2658c3c902752b5 Zach Brown 2026-07-09 227 } 2658c3c902752b5 Zach Brown 2026-07-09 228 :::::: The code at line 184 was first introduced by commit :::::: 2658c3c902752b51b9bebb9bb36cf7dcde32d28d rpdfs: add meta code for caching metadata :::::: TO: Zach Brown :::::: CC: Zach Brown -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki