tracepoint: Support iterating over tracepoints on modules

Add for_each_module_tracepoint() for iterating over tracepoints
on modules. This is similar to the for_each_kernel_tracepoint()
but only for the tracepoints on modules (not including kernel
built-in tracepoints).

Link: https://lore.kernel.org/all/172397777800.286558.14554748203446214056.stgit@devnote2/
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 6be396bb4297a2fd0659476ab9d97d78e7396f0e..837fcf8ec0d59bf87a2f942cb10ac9fd6458e299 100644 (file)
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -64,6 +64,8 @@ struct tp_module {
 bool trace_module_has_bad_taint(struct module *mod);
 extern int register_tracepoint_module_notifier(struct notifier_block *nb);
 extern int unregister_tracepoint_module_notifier(struct notifier_block *nb);
+void for_each_module_tracepoint(void (*fct)(struct tracepoint *, void *),
+                               void *priv);
 #else
 static inline bool trace_module_has_bad_taint(struct module *mod)
 {
@@ -79,6 +81,11 @@ int unregister_tracepoint_module_notifier(struct notifier_block *nb)
 {
        return 0;
 }
+static inline
+void for_each_module_tracepoint(void (*fct)(struct tracepoint *, void *),
+                               void *priv)
+{
+}
 #endif /* CONFIG_MODULES */
 
 /*

diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index 8d1507dd072469b283463b408254858668e374a7..bed4aad36d92b11aef9927ad50f353d7ea0356f5 100644 (file)
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -735,6 +735,27 @@ static __init int init_tracepoints(void)
        return ret;
 }
 __initcall(init_tracepoints);
+
+/**
+ * for_each_module_tracepoint - iteration on all tracepoints in all modules
+ * @fct: callback
+ * @priv: private data
+ */
+void for_each_module_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
+                               void *priv)
+{
+       struct tp_module *tp_mod;
+       struct module *mod;
+
+       mutex_lock(&tracepoint_module_list_mutex);
+       list_for_each_entry(tp_mod, &tracepoint_module_list, list) {
+               mod = tp_mod->mod;
+               for_each_tracepoint_range(mod->tracepoints_ptrs,
+                       mod->tracepoints_ptrs + mod->num_tracepoints,
+                       fct, priv);
+       }
+       mutex_unlock(&tracepoint_module_list_mutex);
+}
 #endif /* CONFIG_MODULES */
 
 /**