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There is times when tracing the tracing infrastructure can be useful for debugging the tracing code. Currently all files in the tracing directory are set to "notrace" the functions. Add a new config option FUNCTION_SELF_TRACING that will allow some of the files in the tracing infrastructure to be traced. It requires a config to enable because it will add noise to the function tracer if events and other tracing features are enabled. Tracing functions and events together is quite common, so not tracing the event code should be the default. Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Tom Zanussi <zanussi@kernel.org> Link: https://patch.msgid.link/20251120181514.736f2d5f@gandalf.local.home Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>