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Message-id: <20090324200027.GH8294@clouds>
Date: Tue, 24 Mar 2009 16:00:28 -0400
From: Jody McIntyre <scjody@....com>
To: torvalds@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org,
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: [PATCH] Documentation / sample code fixes for tracepoints
Fix the tracepoint documentation to refer to "tracepoint-sample" instead of
"tracepoint-example" to match what actually exists; fix the directory,
and clarify how to compile.
Change every instance of "example" in the sample tracepoint code to "sample"
for consistency.
Signed-off-by: Jody McIntyre <scjody@....com>
Index: linux-2.6/Documentation/tracepoints.txt
===================================================================
--- linux-2.6.orig/Documentation/tracepoints.txt
+++ linux-2.6/Documentation/tracepoints.txt
@@ -103,13 +103,14 @@ used to export the defined tracepoints.
* Probe / tracepoint example
-See the example provided in samples/tracepoints/src
+See the example provided in samples/tracepoints
-Compile them with your kernel.
+Compile them with your kernel. They are built during 'make' (not
+'make modules') when CONFIG_SAMPLE_TRACEPOINTS=m.
Run, as root :
-modprobe tracepoint-example (insmod order is not important)
-modprobe tracepoint-probe-example
-cat /proc/tracepoint-example (returns an expected error)
-rmmod tracepoint-example tracepoint-probe-example
+modprobe tracepoint-sample (insmod order is not important)
+modprobe tracepoint-probe-sample
+cat /proc/tracepoint-sample (returns an expected error)
+rmmod tracepoint-sample tracepoint-probe-sample
dmesg
Index: linux-2.6/samples/tracepoints/tracepoint-sample.c
===================================================================
--- linux-2.6.orig/samples/tracepoints/tracepoint-sample.c
+++ linux-2.6/samples/tracepoints/tracepoint-sample.c
@@ -1,6 +1,6 @@
/* tracepoint-sample.c
*
- * Executes a tracepoint when /proc/tracepoint-example is opened.
+ * Executes a tracepoint when /proc/tracepoint-sample is opened.
*
* (C) Copyright 2007 Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
*
@@ -16,7 +16,7 @@
DEFINE_TRACE(subsys_event);
DEFINE_TRACE(subsys_eventb);
-struct proc_dir_entry *pentry_example;
+struct proc_dir_entry *pentry_sample;
static int my_open(struct inode *inode, struct file *file)
{
@@ -32,25 +32,25 @@ static struct file_operations mark_ops =
.open = my_open,
};
-static int __init example_init(void)
+static int __init sample_init(void)
{
- printk(KERN_ALERT "example init\n");
- pentry_example = proc_create("tracepoint-example", 0444, NULL,
+ printk(KERN_ALERT "sample init\n");
+ pentry_sample = proc_create("tracepoint-sample", 0444, NULL,
&mark_ops);
- if (!pentry_example)
+ if (!pentry_sample)
return -EPERM;
return 0;
}
-static void __exit example_exit(void)
+static void __exit sample_exit(void)
{
- printk(KERN_ALERT "example exit\n");
- remove_proc_entry("tracepoint-example", NULL);
+ printk(KERN_ALERT "sample exit\n");
+ remove_proc_entry("tracepoint-sample", NULL);
}
-module_init(example_init)
-module_exit(example_exit)
+module_init(sample_init)
+module_exit(sample_exit)
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mathieu Desnoyers");
-MODULE_DESCRIPTION("Tracepoint example");
+MODULE_DESCRIPTION("Tracepoint sample");
--
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