TNODE_SIZE
#define LEAF_SIZE TNODE_SIZE(1)
bytes += TNODE_SIZE(0) * stat->tnodes;
LEAF_SIZE, TNODE_SIZE(0));
ilog2((SIZE_MAX - TNODE_SIZE(0)) / sizeof(struct key_vector *))
size = TNODE_SIZE(1ul << bits);
pr_debug("AT %p s=%zu %zu\n", tnode, TNODE_SIZE(0),
tnode_free_size += TNODE_SIZE(1ul << tn->bits);