[PATCH v2 1/3] tracepoint: Support iterating over tracepoints on modules

Masami Hiramatsu (Google)
2024-06-01T08:22:40Z

From: Masami Hiramatsu (Google) <mhiramat@kernel.org>

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).

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
include/linux/tracepoint.h | 7 +++++++
kernel/tracepoint.c | 16 ++++++++++++++++
2 files changed, 23 insertions(+)

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 689b6d71590e..46e6a5e759fd 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -65,6 +65,8 @@ 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)
{
@@ -80,6 +82,11 @@ 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 8d1507dd0724..b9b90dc46ab1 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -735,6 +735,22 @@ static __init int init_tracepoints(void)
return ret;
}
__initcall(init_tracepoints);
+
+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 */

/**