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tracing: Only create tracer options files if directory exists 

Do not bother creating tracer options if no tracing directory
exists. If a tracer is enabled via the command line, and is
started before the tracing directory is created, then it wont have
its tracer specific options created.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2015-02-03 11:56:20 -05:00 committed by Steven Rostedt
parent dfbc1534ea
commit 0f67f04ffc
1 changed files with 5 additions and 2 deletions
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7
kernel/trace/trace.c
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@ -4172,8 +4172,11 @@ static int tracing_set_tracer(struct trace_array *tr, const char *buf)
free_snapshot(tr);
}
#endif
/* Currently, only the top instance has options */
if (tr->flags & TRACE_ARRAY_FL_GLOBAL) {
/*
* Only enable if the directory has been created already.
* Currently, only the top instance has options
*/
if (tr->dir && tr->flags & TRACE_ARRAY_FL_GLOBAL) {
destroy_trace_option_files(topts);
topts = create_trace_option_files(tr, t);
}