tests/kernel/probe.c

   1 /* probe.c
   2  *
   3  * Loads a function at a marker call site.
   4  *
   5  * (C) Copyright 2006 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
   6  *
   7  * This file is released under the GPLv2.
   8  * See the file COPYING for more details.
   9  */
  10
  11 #include <linux/marker.h>
  12 #include <linux/module.h>
  13 #include <linux/kallsyms.h>
  14
  15 /* function to install */
  16 #define DO_MARK1_FORMAT "%d"
  17 asmlinkage void do_mark1(const char *format, int value)
  18 {
  19         __mark_check_format(DO_MARK1_FORMAT, value);
  20         printk("value is %d\n", value);
  21 }
  22
  23 int init_module(void)
  24 {
  25         return marker_set_probe("subsys_mark1", DO_MARK1_FORMAT,
  26                         (marker_probe_func*)do_mark1,
  27                         MARKER_CALL);
  28 }
  29
  30 void cleanup_module(void)
  31 {
  32         marker_disable_probe("subsys_mark1", (marker_probe_func*)do_mark1,
  33                 MARKER_CALL);
  34 }
  35
  36 MODULE_LICENSE("GPL");
  37 MODULE_AUTHOR("Mathieu Desnoyers");
  38 MODULE_DESCRIPTION("Probe");
  39