radix_tree_insert_node
assert(radix_tree_insert_node(t, 0, (void *)0xdeadbea0) == 0);
assert(radix_tree_insert_node(t, 1000, (void *)0xdeadbea0) == 0);
assert(radix_tree_insert_node(t, 0, (void *)0xbea0) == 0);
assert(radix_tree_insert_node(t, UINT64_C(10000000000), (void *)0xdea0)
assert(radix_tree_insert_node(t, UINT64_C(10000000001), (void *)0xfff0)
radix_tree_insert_node(t, n->idx, n);
radix_tree_insert_node(t, n->idx, n);
if (radix_tree_insert_node(&uobj->uo_pages, off >> PAGE_SHIFT,
int radix_tree_insert_node(struct radix_tree *, uint64_t, void *);
error = radix_tree_insert_node(&uobj->uo_pages, idx, pg);