SPLAY_HEAD
SPLAY_HEAD(iommu_page_tree, iommu_page_entry) ipm_tree;
SPLAY_HEAD(uturn_page_tree, uturn_page_entry) upm_tree;
SPLAY_HEAD(kfsfileoptree, kernfs_fileop) kfsfileoptree =
SPLAY_HEAD(phtree, pool_item_header);
SPLAY_HEAD(lfs_splay, lbnentry) lfs_lbtree; /* Tree of balloc'd lbns */