for_each_clear_bitrange
for_each_clear_bitrange(rs, re, dbm->bitmap, dbm->count) {
for_each_clear_bitrange(rs, re, bitmap, total) {
for_each_clear_bitrange(s, e, orig, 500)
for_each_clear_bitrange(start, end, cmr->bitmap, nbits) {
for_each_clear_bitrange(start, end, cmr->bitmap, bitmap_maxno)
for_each_clear_bitrange(rs, re, chunk->populated, chunk->nr_pages) {