tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: 3c3550371ac3e9d3326c8263a6eb52d3bb0b43a8 commit: 0bc0d0d57edacd59ebe38d05ad9c4b2bc185aa51 [20217/22256] dhugetlb: backport dynamic hugetlb feature config: x86_64-randconfig-005-20240430 (https://download.01.org/0day-ci/archive/20240430/202404300835.ONBQ5gRx-lkp@i...) compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240430/202404300835.ONBQ5gRx-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/202404300835.ONBQ5gRx-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from arch/x86/include/asm/bug.h:83, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/mm.h:10, from mm/hugetlb.c:7: mm/hugetlb.c: In function 'dhugetlb_acct_memory': mm/hugetlb.c:4172:57: warning: comparison of unsigned expression in '< 0' is always false [-Wtype-limits] 4172 | WARN_ON(hpool->mmap_reserved_1G < 0); | ^ include/asm-generic/bug.h:124:32: note: in definition of macro 'WARN_ON' 124 | int __ret_warn_on = !!(condition); \ | ^~~~~~~~~ mm/hugetlb.c:4188:57: warning: comparison of unsigned expression in '< 0' is always false [-Wtype-limits] 4188 | WARN_ON(hpool->mmap_reserved_2M < 0); | ^ include/asm-generic/bug.h:124:32: note: in definition of macro 'WARN_ON' 124 | int __ret_warn_on = !!(condition); \ | ^~~~~~~~~ In file included from mm/hugetlb.c:14: include/linux/mempolicy.h: At top level: include/linux/mempolicy.h:329:13: warning: '__do_mbind' defined but not used [-Wunused-function] 329 | static long __do_mbind(unsigned long start, unsigned long len, | ^~~~~~~~~~ mm/hugetlb.c: In function 'free_back_hugetlb': mm/hugetlb.c:3748:51: warning: array subscript idx is outside array bounds of 'struct dhugetlb_pool *[0]' [-Warray-bounds=] 3748 | dhugetlb_pagelist_t->hpool[idx] = NULL; | ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~ In file included from include/linux/migrate.h:8, from mm/hugetlb.c:34: include/linux/hugetlb.h:676:31: note: while referencing 'hpool' 676 | struct dhugetlb_pool *hpool[0]; | ^~~~~ mm/hugetlb.c: In function 'hugetlb_migrate_pages':

...

mm/hugetlb.c:3967:41: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 3967 | list_len(&hpool->smpool[i].head_page); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ mm/hugetlb.c:3966:46: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 3966 | hpool->smpool[i].free_pages = | ~~~~~~~~~~~~~^~~ include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In file included from include/linux/mmzone.h:9, from include/linux/gfp.h:6, from include/linux/mm.h:11: In function 'spin_unlock', inlined from 'hugetlb_migrate_pages' at mm/hugetlb.c:3972:5: include/linux/spinlock.h:369:25: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 369 | raw_spin_unlock(&lock->rlock); | ^~~~~~~~~~~~ include/linux/spinlock.h:273:58: note: in definition of macro 'raw_spin_unlock' 273 | #define raw_spin_unlock(lock) _raw_spin_unlock(lock) | ^~~~ include/linux/hugetlb.h: In function 'hugetlb_migrate_pages': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'spin_lock', inlined from 'hugetlb_migrate_pages' at mm/hugetlb.c:3980:5: include/linux/spinlock.h:329:23: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 329 | raw_spin_lock(&lock->rlock); | ^~~~~~~~~~~~ include/linux/spinlock.h:214:48: note: in definition of macro 'raw_spin_lock' 214 | #define raw_spin_lock(lock) _raw_spin_lock(lock) | ^~~~ include/linux/hugetlb.h: In function 'hugetlb_migrate_pages': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'spin_lock', inlined from 'dhugetlb_collect_2M_pages' at mm/hugetlb.c:4096:4: include/linux/spinlock.h:329:23: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 329 | raw_spin_lock(&lock->rlock); | ^~~~~~~~~~~~ include/linux/spinlock.h:214:48: note: in definition of macro 'raw_spin_lock' 214 | #define raw_spin_lock(lock) _raw_spin_lock(lock) | ^~~~ include/linux/hugetlb.h: In function 'dhugetlb_collect_2M_pages': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'merge_free_small_page', inlined from 'dhugetlb_collect_2M_pages' at mm/hugetlb.c:4098:3: mm/hugetlb.c:4076:33: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 4076 | list_len(&hpool->smpool[i].head_page); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/hugetlb.h: In function 'dhugetlb_collect_2M_pages': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'merge_free_small_page', inlined from 'dhugetlb_collect_2M_pages' at mm/hugetlb.c:4098:3: mm/hugetlb.c:4075:30: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 4075 | hpool->smpool[i].free_pages = | ~~~~~~~~~~~~~^~~ include/linux/hugetlb.h: In function 'dhugetlb_collect_2M_pages': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'spin_unlock', inlined from 'dhugetlb_collect_2M_pages' at mm/hugetlb.c:4100:4: include/linux/spinlock.h:369:25: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 369 | raw_spin_unlock(&lock->rlock); | ^~~~~~~~~~~~ include/linux/spinlock.h:273:58: note: in definition of macro 'raw_spin_unlock' 273 | #define raw_spin_unlock(lock) _raw_spin_unlock(lock) | ^~~~ include/linux/hugetlb.h: In function 'dhugetlb_collect_2M_pages': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'spin_unlock', inlined from 'try_migrate_pages' at mm/hugetlb.c:3641:3: include/linux/spinlock.h:369:25: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 369 | raw_spin_unlock(&lock->rlock); | ^~~~~~~~~~~~ include/linux/spinlock.h:273:58: note: in definition of macro 'raw_spin_unlock' 273 | #define raw_spin_unlock(lock) _raw_spin_unlock(lock) | ^~~~ include/linux/hugetlb.h: In function 'try_migrate_pages': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'spin_lock', inlined from 'try_migrate_pages' at mm/hugetlb.c:3650:3: include/linux/spinlock.h:329:23: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 329 | raw_spin_lock(&lock->rlock); | ^~~~~~~~~~~~ include/linux/spinlock.h:214:48: note: in definition of macro 'raw_spin_lock' 214 | #define raw_spin_lock(lock) _raw_spin_lock(lock) | ^~~~ include/linux/hugetlb.h: In function 'try_migrate_pages': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ mm/hugetlb.c:3651:47: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 3651 | nr_free_pages += hpool->smpool[i].free_pages; | ~~~~~~~~~~~~~^~~ include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'spin_lock', inlined from 'try_migrate_pages' at mm/hugetlb.c:3674:3: include/linux/spinlock.h:329:23: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 329 | raw_spin_lock(&lock->rlock); | ^~~~~~~~~~~~ include/linux/spinlock.h:214:48: note: in definition of macro 'raw_spin_lock' 214 | #define raw_spin_lock(lock) _raw_spin_lock(lock) | ^~~~ include/linux/hugetlb.h: In function 'try_migrate_pages': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ mm/hugetlb.c: In function 'free_dhugetlb_pages': mm/hugetlb.c:3692:44: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 3692 | used_pages += hpool->smpool[i].used_pages; | ~~~~~~~~~~~~~^~~ include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'free_dhugetlb_pcpool', inlined from 'free_dhugetlb_pages' at mm/hugetlb.c:3711:3: mm/hugetlb.c:3474:26: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 3474 | smpool = &hpool->smpool[i]; | ^~~~~~~~~~~~~~~~~ include/linux/hugetlb.h: In function 'free_dhugetlb_pages': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'free_dhugetlb_pcpool', inlined from 'free_dhugetlb_pages' at mm/hugetlb.c:3711:3: mm/hugetlb.c:3475:29: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 3475 | list_splice(&smpool->head_page, &hpool->dhugetlb_4K_freelists); | ^~~~~~~~~~~~~~~~~~ include/linux/hugetlb.h: In function 'free_dhugetlb_pages': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'free_dhugetlb_pcpool', inlined from 'free_dhugetlb_pages' at mm/hugetlb.c:3711:3: mm/hugetlb.c:3474:40: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 3474 | smpool = &hpool->smpool[i]; | ~~~~~~~~~~~~~^~~ include/linux/hugetlb.h: In function 'free_dhugetlb_pages': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'free_dhugetlb_pcpool', inlined from 'free_dhugetlb_pages' at mm/hugetlb.c:3711:3: mm/hugetlb.c:3474:40: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 3474 | smpool = &hpool->smpool[i]; | ~~~~~~~~~~~~~^~~ include/linux/hugetlb.h: In function 'free_dhugetlb_pages': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ mm/hugetlb.c: In function 'hpool_alloc': include/linux/spinlock.h:324:28: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 324 | raw_spin_lock_init(&(_lock)->rlock); \ | ^ include/linux/spinlock.h:100:31: note: in definition of macro 'raw_spin_lock_init' 100 | __raw_spin_lock_init((lock), #lock, &__key); \ | ^~~~ mm/hugetlb.c:3327:17: note: in expansion of macro 'spin_lock_init' 3327 | spin_lock_init(&hpool->smpool[i].lock); | ^~~~~~~~~~~~~~ include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ mm/hugetlb.c:3328:17: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 3328 | INIT_LIST_HEAD(&hpool->smpool[i].head_page); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ mm/hugetlb.c: In function 'update_dhugetlb_pagelist': mm/hugetlb.c:3408:35: warning: array subscript idx is outside array bounds of 'struct dhugetlb_pool *[0]' [-Warray-bounds=] 3408 | dhugetlb_pagelist_t->hpool[idx] = hpool; | ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~ include/linux/hugetlb.h:676:31: note: while referencing 'hpool' 676 | struct dhugetlb_pool *hpool[0]; | ^~~~~ mm/hugetlb.c: In function 'get_dhugetlb_pool_from_dhugetlb_pagelist': mm/hugetlb.c:3421:51: warning: array subscript idx is outside array bounds of 'struct dhugetlb_pool *[0]' [-Warray-bounds=] 3421 | hpool = dhugetlb_pagelist_t->hpool[idx]; | ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~ include/linux/hugetlb.h:676:31: note: while referencing 'hpool' 676 | struct dhugetlb_pool *hpool[0]; | ^~~~~ In function 'spin_lock', inlined from 'free_dhugetlb_pool' at mm/hugetlb.c:3766:3: include/linux/spinlock.h:329:23: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 329 | raw_spin_lock(&lock->rlock); | ^~~~~~~~~~~~ include/linux/spinlock.h:214:48: note: in definition of macro 'raw_spin_lock' 214 | #define raw_spin_lock(lock) _raw_spin_lock(lock) | ^~~~ include/linux/hugetlb.h: In function 'free_dhugetlb_pool': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'spin_unlock', inlined from 'free_dhugetlb_pool' at mm/hugetlb.c:3778:3: include/linux/spinlock.h:369:25: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 369 | raw_spin_unlock(&lock->rlock); | ^~~~~~~~~~~~ include/linux/spinlock.h:273:58: note: in definition of macro 'raw_spin_unlock' 273 | #define raw_spin_unlock(lock) _raw_spin_unlock(lock) | ^~~~ include/linux/hugetlb.h: In function 'free_dhugetlb_pool': include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ -- | ^~~ In file included from include/linux/shmem_fs.h:7, from mm/memcontrol.c:39: include/linux/mempolicy.h: At top level: include/linux/mempolicy.h:329:13: warning: '__do_mbind' defined but not used [-Wunused-function] 329 | static long __do_mbind(unsigned long start, unsigned long len, | ^~~~~~~~~~ In function 'free_mem_cgroup_per_node_info', inlined from '__mem_cgroup_free' at mm/memcontrol.c:5315:3: mm/memcontrol.c:5296:57: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 5296 | struct mem_cgroup_per_node *pn = memcg->nodeinfo[node]; | ~~~~~~~~~~~~~~~^~~~~~ In file included from mm/memcontrol.c:35: include/linux/memcontrol.h: In function '__mem_cgroup_free': include/linux/memcontrol.h:324:37: note: while referencing 'nodeinfo' 324 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ mm/memcontrol.c: In function 'alloc_mem_cgroup_per_node_info.constprop': mm/memcontrol.c:5290:24: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 5290 | memcg->nodeinfo[node] = pn; | ~~~~~~~~~~~~~~~^~~~~~ include/linux/memcontrol.h:324:37: note: while referencing 'nodeinfo' 324 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ In function 'mem_cgroup_nodeinfo', inlined from 'memcg_free_shrinker_maps.part.0' at mm/memcontrol.c:375:8: include/linux/memcontrol.h:399:31: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 399 | return memcg->nodeinfo[nid]; | ~~~~~~~~~~~~~~~^~~~~ include/linux/memcontrol.h: In function 'memcg_free_shrinker_maps.part.0': include/linux/memcontrol.h:324:37: note: while referencing 'nodeinfo' 324 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ In function 'mem_cgroup_nodeinfo', inlined from 'memcg_expand_one_shrinker_map' at mm/memcontrol.c:344:9: include/linux/memcontrol.h:399:31: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 399 | return memcg->nodeinfo[nid]; | ~~~~~~~~~~~~~~~^~~~~ include/linux/memcontrol.h: In function 'memcg_expand_one_shrinker_map': include/linux/memcontrol.h:324:37: note: while referencing 'nodeinfo' 324 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ In file included from arch/x86/include/asm/atomic.h:5, from include/linux/atomic.h:7, from include/linux/page_counter.h:5: mm/memcontrol.c:358:51: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 358 | rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_map, new); | ~~~~~~~~~~~~~~~^~~~~ include/linux/compiler.h:296:29: note: in definition of macro 'WRITE_ONCE' 296 | __write_once_size(&(x), __u.__c, sizeof(x)); \ | ^ include/linux/rcupdate.h:409:17: note: in expansion of macro 'smp_store_release' 409 | smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \ | ^~~~~~~~~~~~~~~~~ mm/memcontrol.c:358:17: note: in expansion of macro 'rcu_assign_pointer' 358 | rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_map, new); | ^~~~~~~~~~~~~~~~~~ include/linux/memcontrol.h:324:37: note: while referencing 'nodeinfo' 324 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ In function 'mem_cgroup_nodeinfo', inlined from '__invalidate_reclaim_iterators' at mm/memcontrol.c:1185:8, inlined from 'invalidate_reclaim_iterators' at mm/memcontrol.c:1211:3, inlined from 'mem_cgroup_css_released' at mm/memcontrol.c:5520:2: include/linux/memcontrol.h:399:31: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 399 | return memcg->nodeinfo[nid]; | ~~~~~~~~~~~~~~~^~~~~ include/linux/memcontrol.h: In function 'mem_cgroup_css_released': include/linux/memcontrol.h:324:37: note: while referencing 'nodeinfo' 324 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ In function 'mem_cgroup_nodeinfo', inlined from '__invalidate_reclaim_iterators' at mm/memcontrol.c:1185:8, inlined from 'invalidate_reclaim_iterators' at mm/memcontrol.c:1200:3, inlined from 'mem_cgroup_css_released' at mm/memcontrol.c:5520:2: include/linux/memcontrol.h:399:31: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 399 | return memcg->nodeinfo[nid]; | ~~~~~~~~~~~~~~~^~~~~ include/linux/memcontrol.h: In function 'mem_cgroup_css_released': include/linux/memcontrol.h:324:37: note: while referencing 'nodeinfo' 324 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ mm/memcontrol.c: In function 'memcg_flush_percpu_vmstats': mm/memcontrol.c:3318:65: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 3318 | struct mem_cgroup_per_node *pn = memcg->nodeinfo[node]; | ~~~~~~~~~~~~~~~^~~~~~ include/linux/memcontrol.h:324:37: note: while referencing 'nodeinfo' 324 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ In function 'mem_cgroup_nodeinfo', inlined from 'parent_nodeinfo' at mm/memcontrol.c:726:9, inlined from 'memcg_flush_percpu_vmstats' at mm/memcontrol.c:3331:26: include/linux/memcontrol.h:399:31: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 399 | return memcg->nodeinfo[nid]; | ~~~~~~~~~~~~~~~^~~~~ include/linux/memcontrol.h: In function 'memcg_flush_percpu_vmstats': include/linux/memcontrol.h:324:37: note: while referencing 'nodeinfo' 324 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ mm/memcontrol.c: In function '__alloc_page_from_dhugetlb_pool': mm/memcontrol.c:4769:18: warning: array subscript 0 is outside array bounds of 'struct small_page_pool[0]' [-Warray-bounds=] 4769 | smpool = &hpool->smpool[smp_processor_id()]; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from mm/memcontrol.c:40: include/linux/hugetlb.h:725:32: note: while referencing 'smpool' 725 | struct small_page_pool smpool[0]; | ^~~~~~ In function 'memcg_alloc_shrinker_maps', inlined from 'mem_cgroup_css_online' at mm/memcontrol.c:5472:6: mm/memcontrol.c:400:51: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 400 | rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_map, map); | ~~~~~~~~~~~~~~~^~~~~ include/linux/compiler.h:296:29: note: in definition of macro 'WRITE_ONCE' 296 | __write_once_size(&(x), __u.__c, sizeof(x)); \ | ^ include/linux/rcupdate.h:409:17: note: in expansion of macro 'smp_store_release' 409 | smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \ | ^~~~~~~~~~~~~~~~~ mm/memcontrol.c:400:17: note: in expansion of macro 'rcu_assign_pointer' 400 | rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_map, map); | ^~~~~~~~~~~~~~~~~~ include/linux/memcontrol.h: In function 'mem_cgroup_css_online': include/linux/memcontrol.h:324:37: note: while referencing 'nodeinfo' 324 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ In function 'mem_cgroup_nodeinfo', inlined from 'mem_cgroup_remove_from_trees' at mm/memcontrol.c:643:8, inlined from 'mem_cgroup_css_free' at mm/memcontrol.c:5535:2: include/linux/memcontrol.h:399:31: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 399 | return memcg->nodeinfo[nid]; | ~~~~~~~~~~~~~~~^~~~~ include/linux/memcontrol.h: In function 'mem_cgroup_css_free': include/linux/memcontrol.h:324:37: note: while referencing 'nodeinfo' 324 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ mm/memcontrol.c: In function '__mem_cgroup_threshold': mm/memcontrol.c:4055:45: warning: array subscript i is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 4055 | 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:170:37: note: while referencing 'entries' 170 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ mm/memcontrol.c:4056:42: warning: array subscript i is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 4056 | eventfd_signal(t->entries[i].eventfd, 1); | ~~~~~~~~~~^~~ include/linux/memcontrol.h:170:37: note: while referencing 'entries' 170 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ mm/memcontrol.c:4067:50: warning: array subscript i is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 4067 | 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:170:37: note: while referencing 'entries' 170 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ mm/memcontrol.c:4068:42: warning: array subscript i is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 4068 | eventfd_signal(t->entries[i].eventfd, 1); | ~~~~~~~~~~^~~ include/linux/memcontrol.h:170:37: note: while referencing 'entries' 170 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ In function 'mem_cgroup_page_nodeinfo', inlined from 'mem_cgroup_update_tree' at mm/memcontrol.c:613:8, inlined from 'memcg_check_events.part.0' at mm/memcontrol.c:904:4: mm/memcontrol.c:507:31: warning: array subscript 0 is outside array bounds of 'struct mem_cgroup_per_node *[0]' [-Warray-bounds=] 507 | return memcg->nodeinfo[nid]; | ~~~~~~~~~~~~~~~^~~~~ include/linux/memcontrol.h: In function 'memcg_check_events.part.0': include/linux/memcontrol.h:324:37: note: while referencing 'nodeinfo' 324 | struct mem_cgroup_per_node *nodeinfo[0]; | ^~~~~~~~ mm/memcontrol.c: In function '__mem_cgroup_usage_unregister_event': mm/memcontrol.c:4268:49: warning: array subscript i is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 4268 | if (thresholds->primary->entries[i].eventfd == eventfd) | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ include/linux/memcontrol.h:170:37: note: while referencing 'entries' 170 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ mm/memcontrol.c:4271:63: warning: array subscript i is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 4271 | new->entries[j] = thresholds->primary->entries[i]; | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ include/linux/memcontrol.h:170:37: note: while referencing 'entries' 170 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ mm/memcontrol.c:4271:29: warning: array subscript j is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 4271 | new->entries[j] = thresholds->primary->entries[i]; | ~~~~~~~~~~~~^~~ include/linux/memcontrol.h:170:37: note: while referencing 'entries' 170 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ mm/memcontrol.c:4272:33: warning: array subscript j is outside array bounds of 'struct mem_cgroup_threshold[0]' [-Warray-bounds=] 4272 | if (new->entries[j].threshold <= usage) { | ~~~~~~~~~~~~^~~ include/linux/memcontrol.h:170:37: note: while referencing 'entries' 170 | struct mem_cgroup_threshold entries[0]; | ^~~~~~~ ..

vim +3967 mm/hugetlb.c 3938 3939 static void hugetlb_migrate_pages(struct dhugetlb_pool *hpool, 3940 unsigned long count) 3941 { 3942 int i, try; 3943 struct page *page; 3944 struct split_pages *split_huge, *split_next; 3945 unsigned long nr_pages = 1 << (PMD_SHIFT - PAGE_SHIFT); 3946 LIST_HEAD(wait_page_list); 3947 3948 list_for_each_entry_safe(split_huge, split_next, 3949 &hpool->split_2M_freelists, list) { 3950 /* 3951 * Isolate free page first because we dont want them to be 3952 * allocated. 3953 */ 3954 for (i = 0; i < nr_pages; i++) { 3955 page = pfn_to_page(split_huge->start_pfn + i); 3956 if (!PagePool(page)) 3957 list_move(&page->lru, &wait_page_list); 3958 } 3959 3960 for (try = 0; try < HPOOL_RECLAIM_RETRIES; try++) { 3961 /* 3962 * Unlock and try migration, after migration we need 3963 * to lock back. 3964 */ 3965 for (i = 0; i < NR_SMPOOL; i++) 3966 hpool->smpool[i].free_pages =

3967 list_len(&hpool->smpool[i].head_page); 3968 hpool->free_pages = 3969 list_len(&hpool->dhugetlb_4K_freelists); 3970 spin_unlock(&hpool->lock); 3971 for (i = NR_SMPOOL - 1; i >= 0; i--) 3972 spin_unlock(&hpool->smpool[i].lock); 3973 3974 for (i = 0; i < nr_pages; i++) { 3975 page = pfn_to_page(split_huge->start_pfn + i); 3976 if (PagePool(page)) 3977 try_migrate_page(page, hpool->nid); 3978 } 3979 for (i = 0; i < NR_SMPOOL; i++) 3980 spin_lock(&hpool->smpool[i].lock); 3981 spin_lock(&hpool->lock); 3982 3983 /* 3984 * Isolate free page. If all page in the split_huge 3985 * is free, return it. 3986 */ 3987 split_huge->free_pages = 0; 3988 for (i = 0; i < nr_pages; i++) { 3989 page = pfn_to_page(split_huge->start_pfn + i); 3990 if (!PagePool(page)) { 3991 list_move(&page->lru, &wait_page_list); 3992 split_huge->free_pages++; 3993 } 3994 } 3995 if (split_huge->free_pages == nr_pages) 3996 break; 3997 } 3998 if (split_huge->free_pages == nr_pages) { 3999 for (i = 0; i < nr_pages; i++) { 4000 page = pfn_to_page(split_huge->start_pfn + i); 4001 list_del(&page->lru); 4002 } 4003 INIT_LIST_HEAD(&wait_page_list); 4004 page = pfn_to_page(split_huge->start_pfn); 4005 add_new_huge_page_to_pool(hpool, page, false); 4006 list_del(&split_huge->list); 4007 kfree(split_huge); 4008 hpool->nr_split_2M--; 4009 4010 trace_dhugetlb_split_merge(hpool, page, 4011 DHUGETLB_MIGRATE_4K); 4012 4013 if (--count == 0) 4014 return; 4015 } else { 4016 /* Failed, put back the isolate pages */ 4017 list_splice(&wait_page_list, 4018 &hpool->dhugetlb_4K_freelists); 4019 INIT_LIST_HEAD(&wait_page_list); 4020 } 4021 } 4022 } 4023

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