stack_map_bucket
cost = n_buckets * sizeof(struct stack_map_bucket *) + sizeof(*smap);
struct stack_map_bucket *bucket, *new_bucket, *old_bucket;
new_bucket = (struct stack_map_bucket *)
new_bucket = (struct stack_map_bucket *)
struct stack_map_bucket *buckets[] __counted_by(n_buckets);
struct stack_map_bucket *bucket, *old_bucket;
u64 elem_size = sizeof(struct stack_map_bucket) +
struct stack_map_bucket *old_bucket;
usage += n_buckets * sizeof(struct stack_map_bucket *);
usage += enties * (sizeof(struct stack_map_bucket) + value_size);