ppc64_round_page
dump_avail_off = PPC64_PAGE_SIZE + ppc64_round_page(hdr->msgbufsize);
bitmap_off = dump_avail_off + ppc64_round_page(hdr->dumpavailsize);
pmap_off = bitmap_off + ppc64_round_page(hdr->bitmapsize);
sparse_off = pmap_off + ppc64_round_page(hdr->pmapsize);