tracepoint: Support iterating tracepoints in a loading module

Add for_each_tracepoint_in_module() function to iterate tracepoints in
a module. This API is needed for handling tracepoints in a loading
module from tracepoint_module_notifier callback function.
This also update for_each_module_tracepoint() to pass the module to
callback function so that it can find module easily.

Link: https://lore.kernel.org/all/172397778740.286558.15781131277732977643.stgit@devnote2/

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

1 files changed, 29 insertions, 8 deletions

diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index bed4aad36d92..8879da16ef4d 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -737,23 +737,44 @@ static __init int init_tracepoints(void)
 __initcall(init_tracepoints);
 
 /**
+ * for_each_tracepoint_in_module - iteration on all tracepoints in a module
+ * @mod: module
+ * @fct: callback
+ * @priv: private data
+ */
+void for_each_tracepoint_in_module(struct module *mod,
+				   void (*fct)(struct tracepoint *tp,
+				    struct module *mod, void *priv),
+				   void *priv)
+{
+	tracepoint_ptr_t *begin, *end, *iter;
+
+	lockdep_assert_held(&tracepoint_module_list_mutex);
+
+	if (!mod)
+		return;
+
+	begin = mod->tracepoints_ptrs;
+	end = mod->tracepoints_ptrs + mod->num_tracepoints;
+
+	for (iter = begin; iter < end; iter++)
+		fct(tracepoint_ptr_deref(iter), mod, priv);
+}
+
+/**
  * 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 for_each_module_tracepoint(void (*fct)(struct tracepoint *tp,
+				 struct module *mod, 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);
-	}
+	list_for_each_entry(tp_mod, &tracepoint_module_list, list)
+		for_each_tracepoint_in_module(tp_mod->mod, fct, priv);
 	mutex_unlock(&tracepoint_module_list_mutex);
 }
 #endif /* CONFIG_MODULES */