From 3ad97ff9c220de06e01f97c795fcee49f206595d Mon Sep 17 00:00:00 2001
From: Bjoern Brandenburg <bbb@mpi-sws.org>
Date: Sat, 19 Mar 2016 13:30:20 +0100
Subject: 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.).
---
 include/linux/hrtimer.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'include/linux/hrtimer.h')

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 720063df0ac0..dcbbd65c8af1 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -109,7 +109,7 @@ 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
 };
-- 
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