Commit | Line | Data |
---|---|---|
4a089752 MD |
1 | /* |
2 | * tracepoint-probe-sample2.c | |
3 | * | |
4 | * 2nd sample tracepoint probes. | |
5 | */ | |
6 | ||
7 | #include <linux/module.h> | |
8 | #include <linux/fs.h> | |
9 | #include "tp-samples-trace.h" | |
10 | ||
11 | /* | |
12 | * Here the caller only guarantees locking for struct file and struct inode. | |
13 | * Locking must therefore be done in the probe to use the dentry. | |
14 | */ | |
38516ab5 SR |
15 | static void probe_subsys_event(void *ignore, |
16 | struct inode *inode, struct file *file) | |
4a089752 MD |
17 | { |
18 | printk(KERN_INFO "Event is encountered with inode number %lu\n", | |
19 | inode->i_ino); | |
20 | } | |
21 | ||
7ec7fb39 | 22 | static int __init tp_sample_trace_init(void) |
4a089752 MD |
23 | { |
24 | int ret; | |
25 | ||
38516ab5 | 26 | ret = register_trace_subsys_event(probe_subsys_event, NULL); |
4a089752 MD |
27 | WARN_ON(ret); |
28 | ||
29 | return 0; | |
30 | } | |
31 | ||
32 | module_init(tp_sample_trace_init); | |
33 | ||
7ec7fb39 | 34 | static void __exit tp_sample_trace_exit(void) |
4a089752 | 35 | { |
38516ab5 | 36 | unregister_trace_subsys_event(probe_subsys_event, NULL); |
2504ea5e | 37 | tracepoint_synchronize_unregister(); |
4a089752 MD |
38 | } |
39 | ||
40 | module_exit(tp_sample_trace_exit); | |
41 | ||
42 | MODULE_LICENSE("GPL"); | |
43 | MODULE_AUTHOR("Mathieu Desnoyers"); | |
44 | MODULE_DESCRIPTION("Tracepoint Probes Samples"); |