kmem_walk_step
bufctl_walk_init, kmem_walk_step, kmem_walk_fini },
freectl_walk_init, kmem_walk_step, kmem_walk_fini },
freectl_constructed_walk_init, kmem_walk_step, kmem_walk_fini },
freemem_walk_init, kmem_walk_step, kmem_walk_fini },
freemem_constructed_walk_init, kmem_walk_step, kmem_walk_fini },
kmem_walk_init, kmem_walk_step, kmem_walk_fini },
w.walk_step = kmem_walk_step;
extern int kmem_walk_step(mdb_walk_state_t *);