SPLAY_PROTOTYPE
SPLAY_PROTOTYPE(iommu_page_tree, iommu_page_entry, ipe_node, iomap_compare);
SPLAY_PROTOTYPE(uturn_page_tree, uturn_page_entry, upe_node, upe_compare);
SPLAY_PROTOTYPE(phtree, pool_item_header, ph_node, phtree_compare);
SPLAY_PROTOTYPE(kfsfileoptree, kernfs_fileop, kf_node, kernfs_fileop_compare);
SPLAY_PROTOTYPE(lfs_splay, lbnentry, entry, lge);