[kbuild-all] [ammarfaizi2-block:paulmck/linux-rcu/dev 18/18] mm/slab_common.c:336:23: sparse: sparse: restricted slab_flags_t degrades to integer

tree: https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/dev head: e6e0d15aa1c5117dda15eb266e8b862627af7608 commit: e6e0d15aa1c5117dda15eb266e8b862627af7608 [18/18] mm: Check for SLAB_TYPESAFE_BY_RCU and __GFP_ZERO slab creation config: m68k-randconfig-s032-20220206 (https://download.01.org/0day-ci/archive/20220207/202202070951.I9Vhb0aQ-lk...) compiler: m68k-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/e6e0d15aa1c5117dda15eb2... git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/dev git checkout e6e0d15aa1c5117dda15eb266e8b862627af7608 # 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=m68k SHELL=/bin/bash 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 >>) mm/slab_common.c:336:14: sparse: sparse: restricted slab_flags_t degrades to integer mm/slab_common.c:336:63: sparse: sparse: restricted slab_flags_t degrades to integer mm/slab_common.c:336:86: sparse: sparse: restricted gfp_t degrades to integer vim +336 mm/slab_common.c 321 322 mutex_lock(&slab_mutex); 323 324 err = kmem_cache_sanity_check(name, size); 325 if (err) { 326 goto out_unlock; 327 } 328 329 /* Refuse requests with allocator specific flags */ 330 if (flags & ~SLAB_FLAGS_PERMITTED) { 331 err = -EINVAL; 332 goto out_unlock; 333 } 334 335 /* References to typesafe memory survives free/alloc. */ 337 err = -EINVAL; 338 goto out_unlock; 339 } 340 341 /* 342 * Some allocators will constraint the set of valid flags to a subset 343 * of all flags. We expect them to define CACHE_CREATE_MASK in this 344 * case, and we'll just provide them with a sanitized version of the 345 * passed flags. 346 */ 347 flags &= CACHE_CREATE_MASK; 348 349 /* Fail closed on bad usersize of useroffset values. */ 350 if (WARN_ON(!usersize && useroffset) || 351 WARN_ON(size < usersize || size - usersize < useroffset)) 352 usersize = useroffset = 0; 353 354 if (!usersize) 355 s = __kmem_cache_alias(name, size, align, flags, ctor); 356 if (s) 357 goto out_unlock; 358 359 cache_name = kstrdup_const(name, GFP_KERNEL); 360 if (!cache_name) { 361 err = -ENOMEM; 362 goto out_unlock; 363 } 364 365 s = create_cache(cache_name, size, 366 calculate_alignment(flags, align, size), 367 flags, useroffset, usersize, ctor, NULL); 368 if (IS_ERR(s)) { 369 err = PTR_ERR(s); 370 kfree_const(cache_name); 371 } 372 373 out_unlock: 374 mutex_unlock(&slab_mutex); 375 376 if (err) { 377 if (flags & SLAB_PANIC) 378 panic("%s: Failed to create slab '%s'. Error %d\n", 379 __func__, name, err); 380 else { 381 pr_warn("%s(%s) failed with error %d\n", 382 __func__, name, err); 383 dump_stack(); 384 } 385 return NULL; 386 } 387 return s; 388 } 389 EXPORT_SYMBOL(kmem_cache_create_usercopy); 390 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org