DQL_HIST_LEN
for (i = 0; i < DQL_HIST_LEN; i++) {
#define DQL_HIST_ENT(dql, idx) ((dql)->history[(idx) % DQL_HIST_LEN])
unsigned long history[DQL_HIST_LEN];
start = (hist_head - DQL_HIST_LEN + 1) * BITS_PER_LONG;
if (test_bit(t % (DQL_HIST_LEN * BITS_PER_LONG),