DAT_WALK_LEAF
bool leaf = flags & DAT_WALK_LEAF;
#define DAT_WALK_LEAF_ALLOC (DAT_WALK_LEAF | DAT_WALK_ALLOC)
rc = dat_entry_walk(NULL, entries[LEVEL_MEM].gfn, sg->parent->asce, DAT_WALK_LEAF,
rc = dat_entry_walk(NULL, fault->gfn, gmap->asce, DAT_WALK_LEAF, TABLE_TYPE_PAGE_TABLE,