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As same as fprobe, register tracepoint stub function only when enabling tprobe events. The major changes are introducing a list of tracepoint_user and its lock, and tprobe_event_module_nb, which is another module notifier for module loading/unloading. By spliting the lock from event_mutex and a module notifier for trace_fprobe, it solved AB-BA lock dependency issue between event_mutex and tracepoint_module_list_mutex. Link: https://lore.kernel.org/all/174343538901.843280.423773753642677941.stgit@devnote2/ Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>