hrtimer integration: properly trace late-added timers

When tasks add timers that have already expired (e.g., when preempted
during schedule_hrtimeout), we should not use the expriration time as
the reference time point, but rather the time when the timer was added
(the delay then includes activation of ksoftirqd, etc.).

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 8b4b87bf73fd..4cd94206e784 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -116,7 +116,7 @@ struct hrtimer {
         void                            *start_site;
         char                            start_comm[16];
 #endif
-#ifdef CONFIG_REPORT_TIMER_LATENCY
+#if defined(CONFIG_REPORT_TIMER_LATENCY) || defined(CONFIG_SCHED_OVERHEAD_TRACE)
         ktime_t when_added;
 #endif
 };