[PATCH] tracing: add #include <linux/delay.h> to fix build failure in test_work()

[Ingo Molnar]

This build failure occured on a few rare configs:

 kernel/trace/trace_events.c: In function âtest_workâ:
 kernel/trace/trace_events.c:975: error: implicit declaration of function âudelayâ
 kernel/trace/trace_events.c:980: error: implicit declaration of function âmsleepâ

delay.h is included in way too many other headers, hiding cases
where new usage is added without header inclusion.

Impact: build fix
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
 kernel/trace/trace_events.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 96934f0..791501d 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -15,6 +15,7 @@
 #include <linux/uaccess.h>
 #include <linux/module.h>
 #include <linux/ctype.h>
+#include <linux/delay.h>
 
 #include "trace_output.h"
 
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