GUP_PIN_COUNTING_BIAS
if (count / GUP_PIN_COUNTING_BIAS != refs) {
GUP_PIN_COUNTING_BIAS;
refs *= GUP_PIN_COUNTING_BIAS;
folio_ref_add(folio, refs * GUP_PIN_COUNTING_BIAS);
WARN_ON_ONCE(folio_ref_count(folio) < GUP_PIN_COUNTING_BIAS);
folio_ref_add(folio, GUP_PIN_COUNTING_BIAS);
refs * (GUP_PIN_COUNTING_BIAS - 1));