RAID6_TIME_JIFFIES_LG2
j1 + (1<<RAID6_TIME_JIFFIES_LG2))) {
(20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2));
(20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2));
j1 + (1 << RAID6_TIME_JIFFIES_LG2))) {
(20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2 + 1));