VMEMMAP_TAIL_MIN_ORDER
#define __NR_VMEMMAP_TAILS (MAX_FOLIO_ORDER - VMEMMAP_TAIL_MIN_ORDER + 1)
const unsigned int idx = order - VMEMMAP_TAIL_MIN_ORDER;
order = i + VMEMMAP_TAIL_MIN_ORDER;
if (WARN_ON_ONCE(order < VMEMMAP_TAIL_MIN_ORDER))
idx = order - VMEMMAP_TAIL_MIN_ORDER;