From 2ba64035d0ca966fd189bc3e0826343fc81bf482 Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (Red Hat)" Date: Wed, 31 Jul 2013 13:16:22 -0400 Subject: [PATCH] tracing: Add comment to describe special break case in probe_remove_event_call() The "break" used in the do_for_each_event_file() is used as an optimization as the loop is really a double loop. The loop searches all event files for each trace_array. There's only one matching event file per trace_array and after we find the event file for the trace_array, the break is used to jump to the next trace_array and start the search there. As this is not a standard way of using "break" in C code, it requires a comment right before the break to let people know what is going on. Signed-off-by: Steven Rostedt --- kernel/trace/trace_events.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index ec04836273c0..29a7ebcfb426 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -1732,6 +1732,12 @@ static int probe_remove_event_call(struct ftrace_event_call *call) */ if (file->flags & FTRACE_EVENT_FL_ENABLED) return -EBUSY; + /* + * The do_for_each_event_file_safe() is + * a double loop. After finding the call for this + * trace_array, we use break to jump to the next + * trace_array. + */ break; } while_for_each_event_file(); -- 2.30.2