count_trailing_zeros
ipnum = count_trailing_zeros(ipnum);
ipnum = count_trailing_zeros(ipnum);
pgmap->vmemmap_shift = count_trailing_zeros(vtl0_mem.start_pfn | vtl0_mem.last_pfn);
pgsz_bitmap &= GENMASK(count_trailing_zeros(mask), 0);
nr_zeros = count_trailing_zeros(bit_mask);
cur += count_trailing_zeros(diff) >> 3;
order = min(count_trailing_zeros(pfn), ilog2(end_pfn - pfn));
min(count_trailing_zeros(pfn), ilog2(end_pfn - pfn));
min(count_trailing_zeros(pfn), ilog2(end_pfn - pfn));