kernel/trace/trace_events.c

20 #include <linux/module.h>
47 	struct module		*module;
2707 __register_event(struct trace_event_call *call, struct module *mod)
2719 		call->module = mod;
2822 static void add_str_to_module(struct module *module, char *str)
2830 	 * let the str memory leak when the module is removed.
2832 	 * a leaked string on module removal.
2837 	modstr->module = module;
2881 		 * If the event is part of a module, then we need to free the string
2882 		 * when the module is removed. Otherwise, it will stay allocated
2885 		if (call->module)
2886 			add_str_to_module(call->module, str);
3203 static void trace_module_add_events(struct module *mod)
3212 		pr_err("%s: module has bad taint, not creating trace events\n",
3226 static void trace_module_remove_events(struct module *mod)
3233 		if ((call->flags & TRACE_EVENT_FL_DYNAMIC) || !call->module)
3235 		if (call->module == mod)
3238 	/* Check for any strings allocade for this module */
3240 		if (modstr->module != mod)
3249 	 * It is safest to reset the ring buffer if the module being unloaded
3251 	 * a new module gets loaded, and takes on the same id as the events
3252 	 * of this module. When printing out the buffer, traced events left
3253 	 * over from this module may be passed to the new module events and
3262 	struct module *mod = data;
3282 	.priority = 1, /* higher than trace.c module notify */
3350  * increment the event's module refcount to prevent it from being
3354  * trace_array_put() and decrement the event's module refcount.
3411  * event's module refcount.
3781 		    WARN_ON_ONCE(call->module))
4111 		pr_warn("Failed to register trace events module notifier\n");