Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 31155bc0 authored by Mathieu Desnoyers's avatar Mathieu Desnoyers Committed by Linus Torvalds
Browse files

Linux Kernel Markers - Samples 



Module example showing how to use the Linux Kernel Markers.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: default avatarMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 267c4025

include/linux/marker.h

+0 −1
Original line number Original line Diff line number Diff line
@@ -61,7 +61,6 @@ struct marker { 
		__attribute__((section("__markers"), aligned(8))) =	\

		__attribute__((section("__markers"), aligned(8))) =	\

		{ __mstrtab_name_##name, __mstrtab_format_##name,	\

		{ __mstrtab_name_##name, __mstrtab_format_##name,	\

		0, __mark_empty_function, NULL };			\

		0, __mark_empty_function, NULL };			\

		asm volatile("" : : "i" (&__mark_##name));		\

		__mark_check_format(format, ## args);			\

		__mark_check_format(format, ## args);			\

		if (unlikely(__mark_##name.state)) {			\

		if (unlikely(__mark_##name.state)) {			\

			preempt_disable();				\

			preempt_disable();				\

samples/Kconfig

+5 −0
Original line number Original line Diff line number Diff line
@@ -7,5 +7,10 @@ menuconfig SAMPLES 




if SAMPLES

if SAMPLES





config SAMPLE_MARKERS

	tristate "Build markers examples -- loadable modules only"

	depends on MARKERS && m

	help

	  This build markers example modules.





endif # SAMPLES
 
endif # SAMPLES

samples/Makefile

0 → 100644
+3 −0
Original line number Original line Diff line number Diff line 
# Makefile for Linux samples code



obj-$(CONFIG_SAMPLES)	+= markers/

samples/markers/Makefile

0 → 100644
+4 −0
Original line number Original line Diff line number Diff line 
# builds the kprobes example kernel modules;

# then to use one (as root):  insmod <module_name.ko>



obj-$(CONFIG_SAMPLE_MARKERS) += probe-example.o marker-example.o

samples/markers/marker-example.c

0 → 100644
+54 −0
Original line number Original line Diff line number Diff line 
/* marker-example.c

 *

 * Executes a marker when /proc/marker-example is opened.

 *

 * (C) Copyright 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>

 *

 * This file is released under the GPLv2.

 * See the file COPYING for more details.

 */



#include <linux/module.h>

#include <linux/marker.h>

#include <linux/sched.h>

#include <linux/proc_fs.h>



struct proc_dir_entry *pentry_example;



static int my_open(struct inode *inode, struct file *file)

{

	int i;



	trace_mark(subsystem_event, "%d %s", 123, "example string");

	for (i = 0; i < 10; i++)

		trace_mark(subsystem_eventb, MARK_NOARGS);

	return -EPERM;

}



static struct file_operations mark_ops = {

	.open = my_open,

};



static int example_init(void)

{

	printk(KERN_ALERT "example init\n");

	pentry_example = create_proc_entry("marker-example", 0444, NULL);

	if (pentry_example)

		pentry_example->proc_fops = &mark_ops;

	else

		return -EPERM;

	return 0;

}



static void example_exit(void)

{

	printk(KERN_ALERT "example exit\n");

	remove_proc_entry("marker-example", NULL);

}



module_init(example_init)

module_exit(example_exit)



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Mathieu Desnoyers");

MODULE_DESCRIPTION("Marker example");