tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: cc7cb040bd0afe96f1da94c9f21eda5a986510a5 commit: fae91d6d8be5e20c47e459dbeb3d43bd5f9486f4 [1418/1418] mm/list_lru.c: set bit in memcg shrinker bitmap on first list_lru item appearance config: arm64-randconfig-002-20250207 (https://download.01.org/0day-ci/archive/20250208/202502082031.V2tZWUQg-lkp@i...) compiler: aarch64-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250208/202502082031.V2tZWUQg-lkp@i...) 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 <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202502082031.V2tZWUQg-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from include/linux/page_counter.h:6, from mm/memcontrol.c:34: mm/memcontrol.c: In function 'mem_cgroup_get_max': include/linux/kernel.h:845:45: warning: comparison of unsigned expression in '< 0' is always false [-Wtype-limits] 845 | #define min(x, y) __careful_cmp(x, y, <) | ^ include/linux/kernel.h:828:30: note: in definition of macro '__cmp' 828 | #define __cmp(x, y, op) ((x) op (y) ? (x) : (y)) | ^~ include/linux/kernel.h:845:25: note: in expansion of macro '__careful_cmp' 845 | #define min(x, y) __careful_cmp(x, y, <) | ^~~~~~~~~~~~~ mm/memcontrol.c:1365:28: note: in expansion of macro 'min' 1365 | swap_max = min(swap_max, (unsigned long)total_swap_pages); | ^~~ In file included from mm/memcontrol.c:35: In function 'mem_cgroup_nodeinfo', inlined from 'invalidate_reclaim_iterators' at mm/memcontrol.c:1042:9, inlined from 'mem_cgroup_css_released' at mm/memcontrol.c:4526:2: include/linux/memcontrol.h:352:31: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 352 | return memcg->nodeinfo[nid]; | ~~~~~~~~~~~~~~~^~~~~ include/linux/memcontrol.h: In function 'mem_cgroup_css_released': include/linux/memcontrol.h:309:37: note: while referencing 'nodeinfo' 309 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ In function 'free_mem_cgroup_per_node_info', inlined from '__mem_cgroup_free' at mm/memcontrol.c:4353:3: mm/memcontrol.c:4339:57: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 4339 | struct mem_cgroup_per_node *pn = memcg->nodeinfo[node]; | ~~~~~~~~~~~~~~~^~~~~~ include/linux/memcontrol.h: In function '__mem_cgroup_free': include/linux/memcontrol.h:309:37: note: while referencing 'nodeinfo' 309 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ In function 'alloc_mem_cgroup_per_node_info', inlined from 'mem_cgroup_alloc' at mm/memcontrol.c:4388:7: mm/memcontrol.c:4333:24: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 4333 | memcg->nodeinfo[node] = pn; | ~~~~~~~~~~~~~~~^~~~~~ include/linux/memcontrol.h: In function 'mem_cgroup_alloc': include/linux/memcontrol.h:309:37: note: while referencing 'nodeinfo' 309 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ In file included from include/linux/compiler.h:245, from arch/arm64/include/asm/atomic.h:23, from include/linux/atomic.h:7, from include/linux/page_counter.h:5: In function 'memcg_alloc_shrinker_maps', inlined from 'mem_cgroup_css_online' at mm/memcontrol.c:4485:6: mm/memcontrol.c:391:51: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 391 | rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_map, map); | ~~~~~~~~~~~~~~~^~~~~ arch/arm64/include/asm/barrier.h:95:42: note: in definition of macro '__smp_store_release' 95 | : "=Q" (*p) \ | ^ include/linux/rcupdate.h:411:17: note: in expansion of macro 'smp_store_release' 411 | smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \ | ^~~~~~~~~~~~~~~~~ mm/memcontrol.c:391:17: note: in expansion of macro 'rcu_assign_pointer' 391 | rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_map, map); | ^~~~~~~~~~~~~~~~~~ include/linux/memcontrol.h: In function 'mem_cgroup_css_online': include/linux/memcontrol.h:309:37: note: while referencing 'nodeinfo' 309 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ mm/memcontrol.c: In function 'memcg_set_shrinker_bit':

...

mm/memcontrol.c:432:54: warning: array subscript nid is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 432 | map = rcu_dereference(memcg->nodeinfo[nid]->shrinker_map); | ~~~~~~~~~~~~~~~^~~~~ include/linux/compiler.h:252:36: note: in definition of macro '__READ_ONCE' 252 | __read_once_size(&(x), __u.__c, sizeof(x)); \ | ^ include/linux/rcupdate.h:349:55: note: in expansion of macro 'READ_ONCE' 349 | typeof(*p) *________p1 = (typeof(*p) *__force)READ_ONCE(p); \ | ^~~~~~~~~ include/linux/rcupdate.h:486:9: note: in expansion of macro '__rcu_dereference_check' 486 | __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) | ^~~~~~~~~~~~~~~~~~~~~~~ include/linux/rcupdate.h:544:28: note: in expansion of macro 'rcu_dereference_check' 544 | #define rcu_dereference(p) rcu_dereference_check(p, 0) | ^~~~~~~~~~~~~~~~~~~~~ mm/memcontrol.c:432:23: note: in expansion of macro 'rcu_dereference' 432 | map = rcu_dereference(memcg->nodeinfo[nid]->shrinker_map); | ^~~~~~~~~~~~~~~ include/linux/memcontrol.h:309:37: note: while referencing 'nodeinfo' 309 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ In function 'mem_cgroup_nodeinfo', inlined from 'mem_cgroup_lruvec' at include/linux/memcontrol.h:375:7, inlined from 'mem_cgroup_node_nr_lru_pages' at mm/memcontrol.c:722:26: include/linux/memcontrol.h:352:31: warning: array subscript <unknown> is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 352 | return memcg->nodeinfo[nid]; | ~~~~~~~~~~~~~~~^~~~~ include/linux/memcontrol.h: In function 'mem_cgroup_node_nr_lru_pages': include/linux/memcontrol.h:309:37: note: while referencing 'nodeinfo' 309 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ In function 'mem_cgroup_nodeinfo', inlined from 'mem_cgroup_iter' at mm/memcontrol.c:937:8: include/linux/memcontrol.h:352:31: warning: array subscript <unknown> is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 352 | return memcg->nodeinfo[nid]; | ~~~~~~~~~~~~~~~^~~~~ include/linux/memcontrol.h: In function 'mem_cgroup_iter': include/linux/memcontrol.h:309:37: note: while referencing 'nodeinfo' 309 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ mm/memcontrol.c: In function '__mem_cgroup_threshold': mm/memcontrol.c:3473:45: warning: array subscript i is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 3473 | for (; i >= 0 && unlikely(t->entries[i].threshold > usage); i--) | ~~~~~~~~~~^~~ include/linux/compiler.h:77:45: note: in definition of macro 'unlikely' 77 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ include/linux/memcontrol.h:162:37: note: while referencing 'entries' 162 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ mm/memcontrol.c:3474:42: warning: array subscript i is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 3474 | eventfd_signal(t->entries[i].eventfd, 1); | ~~~~~~~~~~^~~ include/linux/memcontrol.h:162:37: note: while referencing 'entries' 162 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ mm/memcontrol.c:3485:50: warning: array subscript i is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 3485 | for (; i < t->size && unlikely(t->entries[i].threshold <= usage); i++) | ~~~~~~~~~~^~~ include/linux/compiler.h:77:45: note: in definition of macro 'unlikely' 77 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ include/linux/memcontrol.h:162:37: note: while referencing 'entries' 162 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ mm/memcontrol.c:3486:42: warning: array subscript i is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 3486 | eventfd_signal(t->entries[i].eventfd, 1); | ~~~~~~~~~~^~~ include/linux/memcontrol.h:162:37: note: while referencing 'entries' 162 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ mm/memcontrol.c: In function 'memcg_check_events.isra': mm/memcontrol.c:502:31: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 502 | return memcg->nodeinfo[nid]; | ~~~~~~~~~~~~~~~^~~~~ include/linux/memcontrol.h:309:37: note: while referencing 'nodeinfo' 309 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ mm/memcontrol.c: In function '__mem_cgroup_usage_unregister_event': mm/memcontrol.c:3680:49: warning: array subscript i is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 3680 | if (thresholds->primary->entries[i].eventfd == eventfd) | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ include/linux/memcontrol.h:162:37: note: while referencing 'entries' 162 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ mm/memcontrol.c:3683:63: warning: array subscript i is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 3683 | new->entries[j] = thresholds->primary->entries[i]; | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ include/linux/memcontrol.h:162:37: note: while referencing 'entries' 162 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ mm/memcontrol.c:3683:29: warning: array subscript j is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 3683 | new->entries[j] = thresholds->primary->entries[i]; | ~~~~~~~~~~~~^~~ include/linux/memcontrol.h:162:37: note: while referencing 'entries' 162 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ mm/memcontrol.c:3684:33: warning: array subscript j is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 3684 | if (new->entries[j].threshold <= usage) { | ~~~~~~~~~~~~^~~ include/linux/memcontrol.h:162:37: note: while referencing 'entries'

vim +432 mm/memcontrol.c 373 374 static int memcg_alloc_shrinker_maps(struct mem_cgroup *memcg) 375 { 376 struct memcg_shrinker_map *map; 377 int nid, size, ret = 0; 378 379 if (mem_cgroup_is_root(memcg)) 380 return 0; 381 382 mutex_lock(&memcg_shrinker_map_mutex); 383 size = memcg_shrinker_map_size; 384 for_each_node(nid) { 385 map = kvzalloc(sizeof(*map) + size, GFP_KERNEL); 386 if (!map) { 387 memcg_free_shrinker_maps(memcg); 388 ret = -ENOMEM; 389 break; 390 }

391 rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_map, map); 392 } 393 mutex_unlock(&memcg_shrinker_map_mutex); 394 395 return ret; 396 } 397 398 int memcg_expand_shrinker_maps(int new_id) 399 { 400 int size, old_size, ret = 0; 401 struct mem_cgroup *memcg; 402 403 size = DIV_ROUND_UP(new_id + 1, BITS_PER_LONG) * sizeof(unsigned long); 404 old_size = memcg_shrinker_map_size; 405 if (size <= old_size) 406 return 0; 407 408 mutex_lock(&memcg_shrinker_map_mutex); 409 if (!root_mem_cgroup) 410 goto unlock; 411 412 for_each_mem_cgroup(memcg) { 413 if (mem_cgroup_is_root(memcg)) 414 continue; 415 ret = memcg_expand_one_shrinker_map(memcg, size, old_size); 416 if (ret) 417 goto unlock; 418 } 419 unlock: 420 if (!ret) 421 memcg_shrinker_map_size = size; 422 mutex_unlock(&memcg_shrinker_map_mutex); 423 return ret; 424 } 425 426 void memcg_set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id) 427 { 428 if (shrinker_id >= 0 && memcg && !mem_cgroup_is_root(memcg)) { 429 struct memcg_shrinker_map *map; 430 431 rcu_read_lock(); 432 map = rcu_dereference(memcg->nodeinfo[nid]->shrinker_map); 433 set_bit(shrinker_id, map->map); 434 rcu_read_unlock(); 435 } 436 } 437

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