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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 <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2013-07-31 13:16:22 -04:00 committed by Steven Rostedt
parent 2816c551c7
commit 2ba64035d0
1 changed files with 6 additions and 0 deletions
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6
kernel/trace/trace_events.c
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@ -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();