rb_insert
int rb_insert(struct rbtree __arena *rbtree, u64 key, u64 value);
ret = rb_insert(rbtree, key, value);
ret = rb_insert(rbtree, key, value);
ret = rb_insert(rbtree, key, value);
ret = rb_insert(rbtree, key, 2 * key);
ret = rb_insert(rbtree, key, 2 * key);
ret = rb_insert(rbtree, key, 2 * key);
ret = rb_insert(rbtree, key, value);
ret = rb_insert(rbtree, key, 2 * key);
ret = rb_insert(rbtree, prefix + (i % numkeys), i);
ret = rb_insert(rbtree, key, i);
ret = rb_insert(rbtree, prefix - (i % numkeys), i);
ret = rb_insert(rbtree, key, i);
ret = rb_insert(rbtree, key, value);
ret = rb_insert(rbtree, i, i);
ret = rb_insert(rbtree, keys - 1 - i, keys - 1 - i);
ret = rb_insert(rbtree, key, value);
if (rb_insert(alloc, 0, 0))
if (!rb_insert(noalloc, 0, 0))