vmp_chain
void vmp_chain(vm_page_t *, vm_page_t *);
vmp_chain((vm_page_t *)vmmp, (vm_page_t *)to_chain);
vmp->vmp_chain = NULL;
ASSERT3P(vmp->vmp_chain, ==, NULL);
vmp->vmp_chain = to_chain;
return (vmp->vmp_chain);
vm_page_t *next = vmp->vmp_chain;
vm_page_t *vmp_chain;