disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/samples/kprobes/kretprobe_example.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
2
3
  * kretprobe_example.c
3
4
  *
..
..
@@ -7,10 +8,10 @@
7
8
  *
8
9
  * usage: insmod kretprobe_example.ko func=<func_name>
9
10
  *
10
- * If no func_name is specified, _do_fork is instrumented
11
+ * If no func_name is specified, kernel_clone is instrumented
11
12
  *
12
13
  * For more information on theory of operation of kretprobes, see
13
- * Documentation/kprobes.txt
14
+ * Documentation/trace/kprobes.rst
14
15
  *
15
16
  * Build and insert the kernel module as done in the kprobe example.
16
17
  * You will see the trace data in /var/log/messages and on the console
..
..
@@ -25,7 +26,7 @@
25
26
 #include <linux/limits.h>
26
27
 #include <linux/sched.h>
27
28
 
28
-static char func_name[NAME_MAX] = "_do_fork";
29
+static char func_name[NAME_MAX] = "kernel_clone";
29
30
 module_param_string(func, func_name, NAME_MAX, S_IRUGO);
30
31
 MODULE_PARM_DESC(func, "Function to kretprobe; this module will report the"
31
32
 			" function's execution time");
..
..
@@ -47,6 +48,7 @@
47
48
 	data->entry_stamp = ktime_get();
48
49
 	return 0;
49
50
 }
51
+NOKPROBE_SYMBOL(entry_handler);
50
52
 
51
53
 /*
52
54
  * Return-probe handler: Log the return value and duration. Duration may turn
..
..
@@ -66,6 +68,7 @@
66
68
 			func_name, retval, (long long)delta);
67
69
 	return 0;
68
70
 }
71
+NOKPROBE_SYMBOL(ret_handler);
69
72
 
70
73
 static struct kretprobe my_kretprobe = {
71
74
 	.handler		= ret_handler,