[PATCH v3 1/5] tracepoint: Support iterating over tracepoints on modules
From: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Date: 2024-08-18 10:43:02
Also in:
lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
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> --- Changes in v3: - Add kerneldoc for for_each_module_tracepoint. --- include/linux/tracepoint.h | 7 +++++++ kernel/tracepoint.c | 21 +++++++++++++++++++++ 2 files changed, 28 insertions(+)
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 6be396bb4297..837fcf8ec0d5 100644
--- 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 8d1507dd0724..bed4aad36d92 100644
--- 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 */ /**