amap_wiperange_chunk
amap_wiperange_chunk(amap, &amap->am_small, slotoff, slots);
amap_wiperange_chunk(amap, chunk, slotoff, slots);
amap_wiperange_chunk(amap, chunk, slotoff,
void amap_wiperange_chunk(struct vm_amap *, struct vm_amap_chunk *, int,