freelist           23 kernel/kalloc.c   struct run *freelist;
freelist           60 kernel/kalloc.c   r->next = kmem.freelist;
freelist           61 kernel/kalloc.c   kmem.freelist = r;
freelist           74 kernel/kalloc.c   r = kmem.freelist;
freelist           76 kernel/kalloc.c     kmem.freelist = r->next;