_BTREE_TP           4 include/linux/btree-type.h #define BTREE_TP(pfx)			_BTREE_TP(pfx, BTREE_TYPE_SUFFIX,)
_BTREE_TP           8 include/linux/btree-type.h #define VISITOR_FN_T			_BTREE_TP(visitor, BTREE_TYPE_SUFFIX, _t)