804 static int check_flags(struct bpf_htab *htab, struct htab_elem *l_old,  in check_flags()  argument
807 	if (l_old && (map_flags & ~BPF_F_LOCK) == BPF_NOEXIST)  in check_flags()
811 	if (!l_old && (map_flags & ~BPF_F_LOCK) == BPF_EXIST)  in check_flags()
823 	struct htab_elem *l_new = NULL, *l_old;  in htab_map_update_elem()  local
847 		l_old = lookup_nulls_elem_raw(head, hash, key, key_size,  in htab_map_update_elem()
849 		ret = check_flags(htab, l_old, map_flags);  in htab_map_update_elem()
852 		if (l_old) {  in htab_map_update_elem()
855 					      l_old->key + round_up(key_size, 8),  in htab_map_update_elem()
868 	l_old = lookup_elem_raw(head, hash, key, key_size);  in htab_map_update_elem()
870 	ret = check_flags(htab, l_old, map_flags);  in htab_map_update_elem()
874 	if (unlikely(l_old && (map_flags & BPF_F_LOCK))) {  in htab_map_update_elem()
882 				      l_old->key + round_up(key_size, 8),  in htab_map_update_elem()
889 				l_old);  in htab_map_update_elem()
900 	if (l_old) {  in htab_map_update_elem()
901 		hlist_nulls_del_rcu(&l_old->hash_node);  in htab_map_update_elem()
903 			free_htab_elem(htab, l_old);  in htab_map_update_elem()
915 	struct htab_elem *l_new, *l_old = NULL;  in htab_lru_map_update_elem()  local
948 	l_old = lookup_elem_raw(head, hash, key, key_size);  in htab_lru_map_update_elem()
950 	ret = check_flags(htab, l_old, map_flags);  in htab_lru_map_update_elem()
958 	if (l_old) {  in htab_lru_map_update_elem()
960 		hlist_nulls_del_rcu(&l_old->hash_node);  in htab_lru_map_update_elem()
969 	else if (l_old)  in htab_lru_map_update_elem()
970 		bpf_lru_push_free(&htab->lru, &l_old->lru_node);  in htab_lru_map_update_elem()
980 	struct htab_elem *l_new = NULL, *l_old;  in __htab_percpu_map_update_elem()  local
1003 	l_old = lookup_elem_raw(head, hash, key, key_size);  in __htab_percpu_map_update_elem()
1005 	ret = check_flags(htab, l_old, map_flags);  in __htab_percpu_map_update_elem()
1009 	if (l_old) {  in __htab_percpu_map_update_elem()
1011 		pcpu_copy_value(htab, htab_elem_get_ptr(l_old, key_size),  in __htab_percpu_map_update_elem()
1033 	struct htab_elem *l_new = NULL, *l_old;  in __htab_lru_percpu_map_update_elem()  local
1067 	l_old = lookup_elem_raw(head, hash, key, key_size);  in __htab_lru_percpu_map_update_elem()
1069 	ret = check_flags(htab, l_old, map_flags);  in __htab_lru_percpu_map_update_elem()
1073 	if (l_old) {  in __htab_lru_percpu_map_update_elem()
1074 		bpf_lru_node_set_ref(&l_old->lru_node);  in __htab_lru_percpu_map_update_elem()
1077 		pcpu_copy_value(htab, htab_elem_get_ptr(l_old, key_size),  in __htab_lru_percpu_map_update_elem()