jbd2_time_diff
stats->cs_chp_time = jbd2_time_diff(stats->cs_chp_time,
stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging,
jbd2_time_diff(commit_transaction->t_requested,
stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start,
stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked,
stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing,
newts = jbd2_time_diff(ts, transaction->t_start);
time_lock = jbd2_time_diff(start_lock, jiffies);