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-rw-r--r--Documentation/tracepoints.txt13
-rw-r--r--samples/tracepoints/tracepoint-sample.c24
2 files changed, 19 insertions, 18 deletions
diff --git a/Documentation/tracepoints.txt b/Documentation/tracepoints.txt
index 4ff43c6de299..c0e1ceed75a4 100644
--- a/Documentation/tracepoints.txt
+++ b/Documentation/tracepoints.txt
@@ -103,13 +103,14 @@ used to export the defined tracepoints.
103 103
104* Probe / tracepoint example 104* Probe / tracepoint example
105 105
106See the example provided in samples/tracepoints/src 106See the example provided in samples/tracepoints
107 107
108Compile them with your kernel. 108Compile them with your kernel. They are built during 'make' (not
109'make modules') when CONFIG_SAMPLE_TRACEPOINTS=m.
109 110
110Run, as root : 111Run, as root :
111modprobe tracepoint-example (insmod order is not important) 112modprobe tracepoint-sample (insmod order is not important)
112modprobe tracepoint-probe-example 113modprobe tracepoint-probe-sample
113cat /proc/tracepoint-example (returns an expected error) 114cat /proc/tracepoint-sample (returns an expected error)
114rmmod tracepoint-example tracepoint-probe-example 115rmmod tracepoint-sample tracepoint-probe-sample
115dmesg 116dmesg
diff --git a/samples/tracepoints/tracepoint-sample.c b/samples/tracepoints/tracepoint-sample.c
index 68d5dc0310e4..9cf80a11e8b6 100644
--- a/samples/tracepoints/tracepoint-sample.c
+++ b/samples/tracepoints/tracepoint-sample.c
@@ -1,6 +1,6 @@
1/* tracepoint-sample.c 1/* tracepoint-sample.c
2 * 2 *
3 * Executes a tracepoint when /proc/tracepoint-example is opened. 3 * Executes a tracepoint when /proc/tracepoint-sample is opened.
4 * 4 *
5 * (C) Copyright 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> 5 * (C) Copyright 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
6 * 6 *
@@ -16,7 +16,7 @@
16DEFINE_TRACE(subsys_event); 16DEFINE_TRACE(subsys_event);
17DEFINE_TRACE(subsys_eventb); 17DEFINE_TRACE(subsys_eventb);
18 18
19struct proc_dir_entry *pentry_example; 19struct proc_dir_entry *pentry_sample;
20 20
21static int my_open(struct inode *inode, struct file *file) 21static int my_open(struct inode *inode, struct file *file)
22{ 22{
@@ -32,25 +32,25 @@ static struct file_operations mark_ops = {
32 .open = my_open, 32 .open = my_open,
33}; 33};
34 34
35static int __init example_init(void) 35static int __init sample_init(void)
36{ 36{
37 printk(KERN_ALERT "example init\n"); 37 printk(KERN_ALERT "sample init\n");
38 pentry_example = proc_create("tracepoint-example", 0444, NULL, 38 pentry_sample = proc_create("tracepoint-sample", 0444, NULL,
39 &mark_ops); 39 &mark_ops);
40 if (!pentry_example) 40 if (!pentry_sample)
41 return -EPERM; 41 return -EPERM;
42 return 0; 42 return 0;
43} 43}
44 44
45static void __exit example_exit(void) 45static void __exit sample_exit(void)
46{ 46{
47 printk(KERN_ALERT "example exit\n"); 47 printk(KERN_ALERT "sample exit\n");
48 remove_proc_entry("tracepoint-example", NULL); 48 remove_proc_entry("tracepoint-sample", NULL);
49} 49}
50 50
51module_init(example_init) 51module_init(sample_init)
52module_exit(example_exit) 52module_exit(sample_exit)
53 53
54MODULE_LICENSE("GPL"); 54MODULE_LICENSE("GPL");
55MODULE_AUTHOR("Mathieu Desnoyers"); 55MODULE_AUTHOR("Mathieu Desnoyers");
56MODULE_DESCRIPTION("Tracepoint example"); 56MODULE_DESCRIPTION("Tracepoint sample");