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

* Steven Rostedt <> wrote:

> From: Steven Rostedt <>
> As events start to become popular, and the new way to add tracing
> infrastructure into ftrace, it is important to catch any problems
> that might happen with a mistake in the TRACE_EVENT macro.
> This patch introduces a startup self test on the registered trace
> events. Note, it can only do a generic test, any type of testing
> that needs more involement is needed to be implemented by the
> tracepoint creators.
> The test goes down one by one enabling a trace point and running
> some random tasks (random in the sense that I just made them up).
> Those tasks are creating threads, grabbing mutexes and spinlocks
> and using workqueues.
> After testing each event individually, it does the same test after
> enabling each system of trace points. Like sched, irq, lockdep.
> Then finally it enables all tracepoints and performs the tasks
> again. The output to the console on bootup will look like this
> when everything works:
> Running tests on trace events:
> Testing event kfree_skb: OK
> Testing event kmalloc: OK
> Testing event kmem_cache_alloc: OK
> Testing event kmalloc_node: OK
> Testing event kmem_cache_alloc_node: OK
> Testing event kfree: OK
> Testing event kmem_cache_free: OK
> Testing event irq_handler_exit: OK
> Testing event irq_handler_entry: OK
> Testing event softirq_entry: OK
> Testing event softirq_exit: OK
> Testing event lock_acquire: OK
> Testing event lock_release: OK
> Testing event sched_kthread_stop: OK
> Testing event sched_kthread_stop_ret: OK
> Testing event sched_wait_task: OK
> Testing event sched_wakeup: OK
> Testing event sched_wakeup_new: OK
> Testing event sched_switch: OK
> Testing event sched_migrate_task: OK
> Testing event sched_process_free: OK
> Testing event sched_process_exit: OK
> Testing event sched_process_wait: OK
> Testing event sched_process_fork: OK
> Testing event sched_signal_send: OK
> Running tests on trace event systems:
> Testing event system skb: OK
> Testing event system kmem: OK
> Testing event system irq: OK
> Testing event system lockdep: OK
> Testing event system sched: OK
> Running tests on all trace events:
> Testing all events: OK

Thanks Steve, really nice!

FYI, it needed the small build fix below.


From 63c14122a54c26122ccdbe596123f8e2b75c3116 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <>
Date: Thu, 16 Apr 2009 10:26:51 +0200
Subject: [PATCH] tracing: add #include <linux/delay.h> to fix build failure in test_work()
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit

This build failure occured on a few rare configs:

kernel/trace/trace_events.c: In function ‘test_work’:
kernel/trace/trace_events.c:975: error: implicit declaration of function ‘udelay’
kernel/trace/trace_events.c:980: error: implicit declaration of function ‘msleep’

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 <>
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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