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tracing: Add preempt disable for filter self test

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The self testing for event filters does not really need preemption
disabled as there are no races at the time of testing, but the functions
it calls uses rcu_dereference_sched() which will complain if preemption
is not disabled.

Cc: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2011-08-22 09:41:46 -04:00 committed by Steven Rostedt
parent 1d0e78e380
commit 86b6ef21b8
1 changed files with 6 additions and 0 deletions
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6
kernel/trace/trace_events_filter.c
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@ -2101,6 +2101,11 @@ static __init int ftrace_test_event_filter(void)
break;
}
/*
* The preemption disabling is not really needed for self
* tests, but the rcu dereference will complain without it.
*/
preempt_disable();
if (*d->not_visited)
walk_pred_tree(filter->preds, filter->root,
test_walk_pred_cb,
@ -2108,6 +2113,7 @@ static __init int ftrace_test_event_filter(void)
test_pred_visited = 0;
err = filter_match_preds(filter, &d->rec);
preempt_enable();
__free_filter(filter);